ALABAMA GAS CORP
10-K405, 1997-12-22
NATURAL GAS DISTRIBUTION
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                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                    FORM 10-K
[X]    ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(D) OF THE SECURITIES EXCHANGE
       ACT OF 1934 FOR THE YEAR ENDED SEPTEMBER 30, 1997

[ ]    TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(D) OF THE SECURITIES
       EXCHANGE ACT OF 1934 FOR THE TRANSITION PERIOD FROM ___ TO ___

<TABLE>
<CAPTION>
COMMISSION                                                     IRS EMPLOYER
  FILE                                     STATE OF           IDENTIFICATION
  NUMBER          REGISTRANT            INCORPORATION              NUMBER
- -------------------------------------------------------------------------------

<S>         <C>                         <C>                   <C>
1-7810      Energen Corporation            Alabama              63-0757759
2-38960     Alabama Gas Corporation        Alabama              63-0022000
</TABLE>

                             2101 Sixth Avenue North
                            Birmingham, Alabama 35203
                                 (205) 326-2700
                             http://www.energen.com

           Securities Registered Pursuant to Section 12(b) of the Act:

<TABLE>
<CAPTION>
TITLE OF EACH CLASS                                      EXCHANGE ON WHICH REGISTERED
- -------------------                                      ----------------------------
<S>                                                      <C>        
Energen Corporation Common Stock, $0.01 par value        New York Stock Exchange
Energen Corporation Preferred Stock Purchase Rights      New York Stock Exchange
</TABLE>

        Securities Registered Pursuant to Section 12(g) of the Act: NONE

Indicate by a check mark whether registrants (1) have filed all reports required
to be filed by Section 13 or 15(d) of the Securities and Exchange Act of 1934
during the preceding 12 months (or for such shorter period that the registrants
were required to file such reports) and (2) have been subject to such filing
requirements for the past 90 days. YES X   NO
                                      ---     ---              

Indicate by a check mark if disclosure of delinquent filers pursuant to Item 405
of Regulation S-K (Section 229.405 of this chapter) is not contained herein and
will not be contained, to the best of registrant's knowledge, in definitive
proxy or information statements incorporated by reference in Part III of this
Form 10-K or any amendment to this Form 10-K. (X)

Aggregate market value of the voting stock held by non-affiliates of the
registrants as of December 10, 1997:
       Energen Corporation                                      $562,453,654

Indicate number of shares outstanding of each of the registrant's classes of
common stock as of December 10, 1997:
       Energen Corporation                                 14,476,686 shares
       Alabama Gas Corporation                              1,972,052 shares

Alabama Gas Corporation meets the conditions set forth in General Instruction
J(1) (a) and (b) of Form 10-K and is therefore filing this form with the reduced
disclosure format pursuant to General Instruction J(2).

                      DOCUMENTS INCORPORATED BY REFERENCE

- -      Energen Corporation Proxy Statement to be filed on or about December 22,
       1997 (Part III, Item 10-13)
- -      Portions of Energen Corporation 1997 Annual Report to Stockholders are
       incorporated by reference into Part II, Items 5, 6, 7, and 8 of this
       report


<PAGE>   2



                               ENERGEN CORPORATION
                          1997 FORM 10-K ANNUAL REPORT


                                TABLE OF CONTENTS

<TABLE>
<CAPTION>

                                                                                                               PAGE
<S>               <C>                                                                                          <C>

                                                      PART I

Item 1.           Business.......................................................................................3

Item 2.           Properties.....................................................................................8

Item 3.           Legal Proceedings..............................................................................8

Item 4.           Submission of Matters to a Vote of Security Holders............................................8


                                                      PART II


Item 5.           Market for Registrant's Common Stock and Related Stockholder Matters..........................11

Item 6.           Selected Financial Data.......................................................................11

Item 7.           Management's Discussion and Analysis of Financial Condition
                  and Results of Operations.....................................................................11

Item 8.           Financial Statements and Supplementary Data...................................................11

Item 9.           Changes in and Disagreements with Accountants on Accounting
                  and Financial Disclosure......................................................................11


                                                     PART III

Item 10.          Directors and Executive Officers of the Registrants...........................................12

Item 11.          Executive Compensation........................................................................12

Item 12.          Security Ownership of Certain Beneficial Owners and Management................................12

Item 13.          Certain Relationships and Related Transactions................................................12


                                                      PART IV

Item 14.          Exhibits, Financial Statement Schedules, and Reports on Form 8-K..............................13
</TABLE>






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                      (This page intentionally left blank)




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    This Form 10-K is filed on behalf of Energen Corporation (Energen or the
                Company) and Alabama Gas Corporation (Alagasco).

PART I

ITEM 1.      BUSINESS

GENERAL

Energen is a Birmingham-based diversified energy holding company engaged in
natural gas distribution and oil and natural gas exploration and production
activities. Its two major subsidiaries are Alabama Gas Corporation (Alagasco)
and Taurus Exploration Inc. (Taurus).

Energen was incorporated in Alabama in 1978 in connection with the
reorganization of its largest subsidiary, Alagasco. Alagasco was formed in 1948
by the merger of Alabama Gas Company into Birmingham Gas Company, the
predecessors of which had been in existence since the late 1800s. Alagasco
became a public company in 1953. Taurus was formed in 1971 as a subsidiary of
Alagasco and became a subsidiary of Energen in the 1978 reorganization.

FINANCIAL INFORMATION ABOUT INDUSTRY SEGMENTS

The information required by this item is incorporated by reference from Note 15,
Industry Segment Information, to the Consolidated Financial Statements of the
1997 Annual Report to Shareholders and is attached herein as Part IV, Item 14,
Exhibit 13.

NARRATIVE DESCRIPTION OF BUSINESS

- -   NATURAL GAS DISTRIBUTION

    GENERAL: Alagasco is the largest natural gas distribution utility in the
    state of Alabama. Alagasco purchases natural gas through interstate and
    intrastate marketers and suppliers and distributes the purchased gas through
    its distribution facilities for sale to residential, commercial and
    industrial customers and other end-users of natural gas. Alagasco also
    provides transportation services to industrial and commercial customers
    located on its distribution system. These transportation customers, acting
    on their own or using Alagasco as their agent, purchase gas directly from
    producers, marketers or suppliers and arrange for delivery of the gas into
    the Alagasco distribution system; Alagasco then charges a fee to transport
    this customer-owned gas through its distribution system to the customer's
    facility. Alagasco acted as agent for approximately 98 percent of its
    transportation customers in fiscal year 1997.

    Alagasco's service territory is located in central Alabama and in parts of
    north Alabama and includes more than 185 cities and communities in 27
    counties. The aggregate population of the counties served by Alagasco is
    estimated to be 2.3 million. Among the cities served by Alagasco are
    Birmingham, the center of the largest metropolitan area in Alabama, and
    Montgomery, the state capital. During fiscal year 1997, Alagasco served an
    average of 422,878 residential customers, 34,432 small commercial and
    industrial customers, and 54 large commercial and industrial customers.

    The Alagasco distribution system includes approximately 8,950 miles of main
    and more than 9,800 miles of service lines, odorization and regulation
    facilities, and customer meters. Alagasco also operates two liquefied
    natural gas (LNG) facilities which it uses to meet peak demand.

    APSC REGULATION: As an Alabama utility, Alagasco is subject to regulation
    by the Alabama Public Service Commission (APSC). Alagasco's rate-setting
    process, Rate Stabilization and Equalization (RSE), was established by the
    APSC in 1983, was extended with modifications in 1985, 1987 and 1990, and
    was further extended in 1996. RSE replaces the traditional utility rate
    case with quarterly reviews and adjustments designed to give

                                        3

<PAGE>   5



     Alagasco an opportunity to earn a return on average equity at year-end
     within a designated range, which presently is 13.15 percent to 13.65
     percent. Alagasco has earned at or near its allowed range since fiscal
     1990, when RSE was modified to include a forward-looking test year. Most
     recently, on October 7, 1996, the APSC unanimously voted to extend RSE
     without change for a five-year period, through January 1, 2002. Under the
     terms of the extension, RSE will continue after January 1, 2002, unless,
     after notice to the Company and a hearing, the APSC votes to modify or
     discontinue its operation.

     Under RSE as extended, the APSC conducts quarterly reviews to determine,
     based on Alagasco's projections and fiscal year-to-date performance,
     whether Alagasco's return on equity for the fiscal year will be within the
     allowed range. Reductions in rates can be made quarterly to bring the
     projected return within the allowed range; increases, however, are allowed
     only once each fiscal year, effective December 1, and cannot exceed 4
     percent of prior-year revenues. RSE limits the utility's equity upon which
     a return is permitted to 60 percent of total capitalization and provides
     for certain cost control measures designed to monitor Alagasco's operations
     and maintenance expenses (O&M). If the change in O&M per customer falls
     within 1.25 percentage points above or below the Consumer Price Index for
     All Urban Customers (index range), no adjustment is required. If the change
     in O&M per customer exceeds the index range, three quarters of the
     difference is returned to customers. To the extent the change is less than
     the index range, the utility benefits by one-half of the difference through
     future rate adjustments.

     In 1990 the APSC approved a temperature adjustment rider to Alagasco's rate
     tariff designed to mitigate the earnings impact of variances from normal
     temperatures. Alagasco performs this real-time temperature adjustment
     calculation monthly, and the adjustments to customers' bills are made in
     the same billing cycle in which the weather variations occurred.

     Alagasco's rate schedules for natural gas distribution charges contain a
     Gas Supply Adjustment (GSA) rider, established in 1993, which permits the
     pass-through to customers of changes in the cost of gas supply, including
     Gas Supply Realignment (GSR) surcharges. These surcharges were imposed by
     Alagasco's suppliers as a result of changes in gas supply purchases related
     to the implementation of Federal Energy Regulatory Commission (FERC) Order
     636. On October 7, 1996, the APSC issued an order providing for the refund
     to customers of approximately $17 million of supplier refunds, including
     interest. Alagasco refunded these amounts to customers during January 1997.
     The refunds were collected from a variety of sources and most related to
     the settlement of rate case and FERC Order 636 proceedings of Southern
     Natural Gas Company (Southern).

     GAS SUPPLY: Alagasco's distribution system is connected to and has firm
     transportation contracts with two major interstate pipeline systems --
     Southern and Transcontinental Gas Pipe Line Corporation (Transco). On
     Southern's system, Alagasco has 250,924 Mcfd (thousand cubic feet per day)
     of No-Notice Firm Transportation service through October 31, 2008, and
     91,946 Mcfd, 40,000 Mcfd and 10,000 Mcfd of Firm Transportation service
     through October 31 of 2008, 2002, and 1998, respectively. Alagasco also has
     12,426,687 Mcf of storage capacity on Southern's system, with a maximum
     withdrawal rate of 250,924 Mcfd and a maximum injection rate of 95,590
     Mcfd. The Transco Firm Transportation contract, which expires in 2002,
     provides for up to 100,000 Mcfd. As a result, Alagasco has a peak day firm
     interstate pipeline transportation capacity of 492,870 Mcfd.

     Alagasco purchases gas from various gas producers and marketers, including
     affiliates of Southern and Transco, and from certain intrastate producers
     and marketers. Alagasco has contracts in place to purchase up to 281,468
     Mcfd of firm supply, of which 241,946 Mcfd is supported by firm
     transportation on the Transco and Southern systems and approximately 24,000
     Mcfd is purchased at the city gate under intrastate firm supply contracts.
     These firm supply volumes along with Alagasco's maximum withdrawal from
     storage of 250,924 Mcfd and LNG peak-shaving capacity of 200,000 Mcfd, give
     Alagasco a peak day firm supply of 732,392 Mcfd. Alagasco also utilizes the
     Southern and Transco pipeline systems to access spot market gas in order to
     supplement its firm system supply and serve its industrial and large
     commercial transportation customers.

     RATE FLEXIBILITY AND COMPETITION: The price of natural gas is a significant
     competitive factor in Alagasco's service territory, particularly among
     large commercial and industrial customers. Propane, coal and fuel oil are
     readily available, and many industrial customers have the capability to
     switch to alternate fuels and/or alternate

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     sources of gas. In the residential and small commercial and industrial
     markets, electricity is the principal competitor.

     With the support of the APSC, Alagasco has implemented a variety of
     flexible rate strategies to help it compete for the large customers' gas
     load in the deregulated marketplace. Rate flexibility remains critical as
     the utility faces intense competition for the large customer load. To date,
     the utility has been effective in utilizing its flexible rate strategies to
     limit bypass and minimize price-based switching to alternate fuels and
     alternate sources of gas.

     In 1994 Alagasco implemented the P Rate in response to the competitive
     challenge of interstate pipeline capacity release. Under this tariff
     provision, Alagasco releases much of its excess pipeline capacity and
     repurchases it as agent for its transportation customers under 12 month
     contracts. The transportation customers benefit from lower pipeline costs.
     Alagasco's core market customers benefit, as well, since the utility uses
     the revenues received from the P Rate to decrease gas costs for its
     residential and small commercial and industrial customers. In fiscal 1997,
     approximately 280 of Alagasco's transportation customers utilized the P
     Rate, and the resulting reduction in core market gas costs totaled
     approximately $9 million.

     The Competitive Fuel Clause (CFC) and Transportation Tariff also have been
     important to Alagasco's ability to compete effectively for customer load in
     its service territory. The CFC allows Alagasco to adjust large customer
     rates on a case-by-case basis to compete with alternate fuels and alternate
     sources of gas. The GSA rider to Alagasco's tariff increases the rates paid
     by other customers to recover the reduction in rates allowed under the CFC
     because the retention of any customer, particularly large commercial and
     industrial customers, benefits all customers by recovering a portion of the
     system's fixed costs. The Transportation Tariff allows Alagasco to
     transport gas for customers rather than buy and resell it to them. The
     Transportation Tariff is based on Alagasco's sales profit margin, so net
     income is unaffected. The Transportation Tariff also may be adjusted under
     the CFC.

     Alagasco also uses long-term special contracts as a vehicle for retaining
     large customer load. At the end of fiscal 1997, 35 of the utility's largest
     commercial and industrial customers were under special contracts of varying
     lengths.

     During 1997 substantially all of Alagasco's large commercial and industrial
     customer deliveries were the transportation of customer-owned gas. In
     addition, Alagasco served as gas purchasing agent for approximately 98
     percent of its transportation customers.

     Natural gas service available to Alagasco customers generally falls into
     two categories: interruptible and firm. Interruptible service is
     contractually subject to interruption by Alagasco for various reasons, the
     most common of which is curtailment of industrial customers during periods
     of peak residential heating demand. Firm service, in general, is not
     subject to interruption and, therefore, is more expensive. Firm service is
     generally provided to residential and small commercial and industrial
     customers, while interruptible service is generally provided to large
     commercial and industrial customers which typically have the capacity to
     reduce gas consumption by adjusting their production schedules or by
     switching to alternate fuels during periods of interruption. Deliveries of
     sales and transportation gas totaled 106,533 million cubic feet (MMcf) in
     fiscal 1997.

     GROWTH: Customer growth presents a major challenge for Alagasco, and its
     low customer growth rate in 1997 underscores the utility's mature nature
     and the slow-growth character of its service territory. Customer growth in
     fiscal 1997 was less than 1 percent. At the same time, the utility
     penetrated 89 percent of the new single-family homes built in its service
     territory and 27 percent of the new multi-family construction. Meanwhile,
     Alagasco's saturation rate of approximately 70 percent exceeds the national
     average of approximately 51 percent.

     A vehicle for supplementing Alagasco's normal growth continues to be
     Alagasco's municipal acquisition program. Since 1985 Alagasco has acquired
     22 municipally-owned systems, adding more than 42,000 customers through
     initial system purchases and subsequent customer additions. Alagasco has
     been successful in increasing the systems' relatively low saturation rates
     subsequent to purchase through a variety of marketing efforts including
     offering natural gas service to propane customers already situated on the
     municipal system's lines, expanding into

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     nearby neighborhoods that desire natural gas service, and marketing natural
     gas appliances to existing and new customers. Approximately 80 municipal
     systems representing about 250,000 customers remain in Alabama. Although
     Alagasco did not acquire any new municipal gas systems in 1997, it
     continues to pursue their purchase and company management believes they
     offer future growth opportunities.

     WEATHER: Alagasco's gas distribution business is highly seasonal since a
     material portion of the utility's total sales and delivery volumes is to
     customers (principally residential and small commercial and industrial)
     whose use varies depending upon temperature. Alagasco's rate tariff
     includes a temperature adjustment rider which is designed to mitigate the
     effect of departures from normal temperature on Alagasco's earnings. The
     calculation is performed monthly, and adjustments are made to customers'
     bills in the actual month the weather variation occurs.

     ENVIRONMENTAL MATTERS: Alagasco is in the chain of title of eight former
     manufactured gas plant sites and five manufactured gas distribution sites.
     It still owns four of the plant sites and one of the distribution sites.
     Preliminary investigations do not indicate the present need for remediation
     activities. Management expects that, should remediation of any such sites
     be required in the future, Alagasco's share of any associated costs will
     not materially affect the results of its operations or financial condition.

     OTHER: For a discussion of risks inherent in the Company's businesses, see
     Management's Discussion and Analysis in the 1997 Annual Report to
     Shareholders (pages 27 and 28) which is attached herein as Part IV, Item
     14, Exhibit 13.

- -   OIL AND GAS EXPLORATION AND PRODUCTION ACTIVITIES

    GENERAL: Taurus is involved primarily in the acquisition and development of
    producing oil and natural gas properties with varying levels of development
    potential and in the exploration and development of new reservoirs. Taurus
    also provides fee-based coalbed methane operating services in the Black
    Warrior Basin for its partners and third parties. All of Taurus's operations
    are located in the United States. At the end of fiscal 1997, Taurus's
    remaining recoverable reserves totaled 673.3 billion cubic feet equivalent
    (Bcfe) and were located primarily in Alabama, New Mexico, Texas,
    Mississippi, Louisiana and the Gulf of Mexico.

    GROWTH STRATEGY: Fiscal 1997 marked the end of the second year of Energen's
    growth plan which calls for significant capital investment in Taurus's oil
    and gas activities. During fiscal years 1996 and 1997, Taurus invested $357
    million under the plan, adding an estimated 638 Bcfe of proved reserves:
    $280 million was spent to acquire producing properties, $32 million was
    invested in associated development, and $45 million was used for exploration
    and related development. Also under the plan, Taurus invested $16 million to
    obtain a 9 percent working interest in an exploration joint venture in east
    Texas. Over the next three fiscal years, Taurus anticipates spending $300 to
    $450 million for property acquisitions, $50 million in associated
    development and $150 million for exploration and related development.

    PROPERTY ACQUISITIONS AND DEVELOPMENT: Taurus's acquisition efforts focus on
    the purchase of producing properties which have varying degrees of potential
    for increased reserves and production. During fiscal years 1996 and 1997,
    Taurus acquired an estimated 620 Bcfe of proved reserves for $280 million,
    resulting in an average acquisition cost of 45 cents per Mcfe. In addition,
    Taurus spent $32 million over the last two years in development costs and
    plans to spend approximately $12.5 million over the next several years to
    substantially develop these predominantly proved developed producing (PDP)
    reserves. Taurus has replaced through acquisitions approximately 12 times
    its two-year production of 53 Bcfe.

    In fiscal 1997, Taurus invested $172 million to acquire an estimated 452
    Bcfe of proved reserves at an average acquisition cost of 38 cents per Mcfe,
    and Taurus's two largest property acquisitions to date occurred in fiscal
    1997.

    Effective January 1, 1997, Taurus purchased an estimated 319 Bcfe of high
    BTU content natural gas reserves in the San Juan Basin of New Mexico from
    Burlington Resources Inc. for $77 million. Taurus operates more than 1,000
    of the approximately 1,900 producing wells. Since assuming operations in
    August 1997, Taurus has

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     enhanced the performance of its San Juan Basin properties. After bringing
     on-line some shut-in wells and performing some modifications to surface
     facilities, daily net production increased from 26 MMcf to approximately 33
     MMcf at the end of the fiscal year. During fiscal 1997, Taurus's nine
     months of production totaled 10.5 Bcfe, and production is expected to
     exceed 14.5 Bcfe in fiscal 1998. Taurus plans to spend approximately $8
     million on additional operational improvements and fully develop these
     long-lived, predominantly PDP reserves. Taurus also plans to capitalize on
     exploitation opportunities presented by these properties and could invest
     an additional $15 million over the next three years to develop the
     additional reserve potential; depending on Taurus's drilling success, the
     company could invest another $15 million in years four and five.

     In its second largest acquisition, Taurus closed August 1, 1997, on the $72
     million purchase of 107 Bcf of coalbed methane reserves in the Black
     Warrior Basin of Alabama from Amoco Corporation. Net annual production from
     the more than 260 producing wells, all operated by Taurus, is expected to
     exceed 7.5 Bcf during fiscal 1998. Through the year 2002, all production
     qualifies for the nonconventional fuels tax credit, which presently is
     valued at approximately $1.05 per Mcf and increases annually with
     inflation. Combined with Taurus's other credit-qualifying coalbed methane
     production, the Company expects to produce more than $14.5 million in tax
     credits in 1998.

     EXPLORATION AND DEVELOPMENT: Exploration is an integral part of Energen's
     growth strategy. In the first two year's of Energen's growth plan, Taurus
     has invested $45 million in exploration and related development, adding 18
     Bcfe of proved reserves. Taurus also invested $16 million to acquire a 9
     percent interest in a joint venture in the east Texas salt basin. During
     fiscal 1997, Taurus achieved its target 50 percent success rate with seven
     successful exploration wells out of 14 drilled. Proved reserve additions
     totaled 12 Bcfe. In light of Taurus's large, predominantly PDP acquisitions
     in the Black Warrior and San Juan basins, the Company decided during 1997
     to increase its exploration involvement in order to achieve the proper mix
     of activities and returns needed to realize target growth objectives.
     Taurus increased its working interest position with United Meridian
     Corporation (UMC), its primary offshore Gulf of Mexico partner, from 12.5
     percent to 20 percent and expanded its activities onshore.

     In June 1997, Taurus invested $16 million to acquire a 9 percent interest
     from Sonat Exploration Company in its joint venture with UMC and MB
     Exploration in the northern end of the Cotton Valley Pinnacle Reef play in
     the east Texas salt basin. The joint venture's first well failed to
     encounter a pinnacle reef. Taurus expects to participate in approximately
     three to six joint venture wells during fiscal 1998.

     Taurus also is the operating partner in a relatively small exploratory play
     in southwest Mississippi with DDD Energy Inc. of Houston and Griffin and
     Griffin Oil Company Inc. of Jackson, Miss. Taurus has a 50 percent working
     interest to casing point. Taurus achieved good results from the first well
     it drilled for the joint venture. Targeting the Tuscaloosa trend, this well
     tested at 2,000 Mcfd. In 1998 Taurus plans to participate in up to 15 wells
     targeting the Tuscaloosa and Frio trends and currently is securing the
     necessary leases.

     RISK MANAGEMENT: In implementing Energen's growth strategy, Taurus seeks to
     mitigate the risks inherent in the oil and gas business. In addition to its
     increasing use of in-house acquisition and exploration capabilities, Taurus
     continues to partner with proven industry operators having similar risk
     tolerances and earnings objectives. Taurus also spreads its exploratory
     risk, typically taking no more than a 25% interest in any one exploration
     prospect. Additionally, Taurus utilizes futures contracts traded on the New
     York Mercantile Exchange and over-the-counter swaps and basis hedges with
     major energy derivative product specialists as well as fixed-price
     contracts to mitigate commodity price risk. Taurus typically will hedge
     production for 18 to 36 months immediately after an acquisition; on an
     on-going basis, Taurus is prepared to hedge up to 80 percent of flowing
     production in any given fiscal year depending on the outlook for prices.
     For fiscal 1998, Taurus has entered into contracts and swaps for 36.3 Bcf
     of its 1998 flowing gas production at an average contract price (before
     basis differences) of $2.26 per Mcf and 453 MBbl of its oil production at
     an average contract price of $20.29 per barrel.

     ENVIRONMENTAL MATTERS: Taurus is subject to various environmental
     regulations. Management believes that Taurus is in compliance with
     currently applicable standards of the environmental agencies to which it is
     subject 


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<PAGE>   9


     and that potential environmental liabilities, if any, are minimal. Also, to
     the extent that Taurus has operating agreements with various joint venture
     partners, environmental costs, if any, would be shared proportionately.

     OTHER: For a discussion of risks inherent in the Company's businesses, see
     Management's Discussion and Analysis in the 1997 Annual Report to
     Shareholders (pages 27 and 28) which is attached herein as Part IV, Item
     14, Exhibit 13.

EMPLOYEES

The Company has 1,469 employees; Alagasco employs 1,304; Taurus employs 153; and
Energen's other subsidiaries employ 12.

ITEM 2.      PROPERTIES

The corporate headquarters of Energen, Alagasco and Taurus are located in leased
office space in Birmingham, Alabama.

The properties of Alagasco consist primarily of its gas distribution system,
which includes more than 8,950 miles of main, more than 9,800 miles of service
lines, odorization and regulation facilities, and customer meters. Alagasco also
has two liquefied natural gas facilities, eight division offices, nine payment
centers, six district offices, nine service centers, and other related property
and equipment, some of which are leased by Alagasco. For further description of
Alagasco's properties, see discussion under Item I--Business.

For a description of Taurus's oil and gas properties, see the discussion under
Item 1--Business. Information concerning Taurus's production, reserves and
development is included in Note 13, Oil and Gas Producing Activities (unaudited)
to the Consolidated Financial Statements which is incorporated by reference from
the 1997 Annual Report to Stockholders and included in Part IV, Item 14, Exhibit
13, herein. The proved reserve estimates are consistent with comparable reserve
estimates filed by Taurus with any federal authority or agency.

ITEM 3.      LEGAL PROCEEDINGS

Energen and its affiliate are, from time to time, parties to various pending or
threatened legal proceedings. Certain of these lawsuits include claims for
punitive damages in addition to other specific relief. Based upon information
presently available and in light of available legal and other defenses,
contingent liabilities arising from threatened and pending litigation are not
considered material in relation to the respective financial positions of Energen
and its affiliates. It should be noted, however, that Energen and its affiliates
conduct business in Alabama and other jurisdictions in which the magnitude and
frequency of punitive damage awards bearing little or no relation to culpability
or actual damages continue to rise making it increasingly difficult to predict
litigation results.

ITEM 4.      SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS

No matters were submitted to a vote of security holders during the fourth
quarter of 1997.


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EXECUTIVE OFFICERS OF THE REGISTRANTS

ENERGEN CORPORATION

<TABLE>
<CAPTION>

       Name                Age                   Position (1)
<S>                        <C>    <C>                       

Rex J. Lysinger            60     Chairman of the Board (2)
                        
Wm. Michael Warren, Jr.    50     President and Chief Executive Officer (3)
                        
Geoffrey C. Ketcham        46     Executive Vice President, Chief Financial 
                                  Officer and Treasurer (4)
                        
Gary C. Youngblood         54     President and  Chief Operating Officer of
                                  Alagasco (5)
                        
James T. McManus           39     President and Chief Operating Officer of
                                  Taurus (6)
                        
Dudley C. Reynolds         44     General Counsel and Secretary (7)
                        
Paula H. Rushing           44     Vice President--Finance of Alagasco (8)
                        
John A. Wallace            53     Senior Vice President--Methane of Taurus (9)
                        
J. David Woodruff, Jr.     41     Vice President--Legal and Assistant Secretary 
                                  and Vice President--Corporate Development 
                                  (10)
</TABLE>                        

NOTES:   (1)   All executive officers of Energen have been employed by Energen
               or a subsidiary for the past five years. Officers serve at the
               pleasure of its Board of Directors.

          (2)  Served as Vice President of Alagasco from July 1975 to January
               1977, when he was elected President. Elected President of Energen
               upon its formation in 1978. Elected Chairman of the Board of
               Energen and its subsidiaries September 1982. Currently Chairman
               of the Board of Energen and all subsidiaries, has announced
               retirement effective January 1, 1998. Serves as a Director of
               Energen and each of its subsidiaries.

          (3)  Served as Senior Vice President and General Counsel of Alagasco
               from September 1983 to October 1984, when he was elected
               President and Chief Operating Officer of that corporation.
               Elected Executive Vice President of Energen June 1987 and elected
               President and Chief Operating Officer of Energen April 1991.
               Elected President and Chief Operating Officer of all Energen
               subsidiaries January 1992. Elected Chief Executive Officer of
               Alagasco and Taurus effective October 1995. Elected Chief
               Executive Officer of Energen February 1997. Elected Chairman of
               the Board of Energen effective January 1, 1998. Serves as a
               Director of Energen and each of its subsidiaries.

          (4)  Elected Controller of Alagasco November 1981, Vice President and
               Controller June 1984, Vice President--Finance and Planning of
               Alagasco June 1985 and Vice President--Planning of Energen August
               1986. Elected Vice President--Finance, Chief Financial Officer
               and Treasurer of Energen and each of its subsidiaries June 1987.
               Elected Senior Vice President--Finance, Chief Financial Officer
               and Treasurer of Energen and each of its subsidiaries April 1989.
               Elected Executive Vice President, Chief Financial Officer and
               Treasurer of Energen and each of its subsidiaries April 1991.


                                        9

<PAGE>   11



          (5)  Served as District Manager--Birmingham District until June 1985,
               when he was elected Vice President--Birmingham Operations;
               Elected Senior Vice President--Administration of Alagasco April
               1991. Elected Executive Vice President of Alagasco October 1993.
               Elected Chief Operating Officer of Alagasco effective October
               1995. Elected President of Alagasco April 1997.

          (6)  Served as Director of Corporate Accounting of Energen until
               November 1988, when he was elected Controller of Energen; Elected
               Controller of Alagasco May 1989. Elected Assistant Vice
               President--Corporate Development of Energen June 1990. Elected
               Vice President--Finance and Corporate Development of Energen and
               Vice President--Finance and Planning of Alagasco effective April
               1991. Elected Executive Vice President and Chief Operating
               Officer of Taurus effective October 1995. Elected President of
               Taurus April 1997.

          (7)  Served as Staff Attorney for Energen and its subsidiaries to
               November 1984, when he was named Senior Attorney. Elected
               Assistant Secretary in 1985 and Secretary effective September
               1986. Elected Vice President--Legal and Secretary of Energen and
               each of its subsidiaries June 1987. Elected General Counsel and
               Secretary of Energen and each of its subsidiaries April 1991.

          (8)  Served as Director--General Accounting of Alagasco until October
               1995, when she was elected Controller of Alagasco. Elected Vice
               President--Finance of Alagasco November 1997.

          (9)  Served as Manager, Methane Development of Taurus until August
               1988, when he was elected Vice President Methane Operations of
               Taurus. Elected Vice President Methane Exploration and Production
               of Taurus November 1990. Elected Senior Vice President--Methane
               of Taurus February 1992.

          (10) Served as Staff Attorney for Alagasco from March 1986 to June
               1987 when he was named Senior Attorney. Elected Assistant Vice
               President--Legal and Assistant Secretary of Energen and each of
               its subsidiaries November 1988. Elected Vice President--Legal and
               Assistant Secretary of Energen and each of its subsidiaries April
               1991. Elected Vice President--Legal, and Assistant Secretary of
               Energen and each of its subsidiaries and Vice
               President--Corporate Development of Energen October 1995.










                                       10

<PAGE>   12



PART II

ITEM 5.      MARKET FOR THE REGISTRANT'S COMMON STOCK AND RELATED STOCKHOLDER
             MATTERS

The information regarding Energen's common stock and the frequency and amount of
dividends paid during the past two years with respect to such stock is
incorporated by reference from the 1997 Annual Report to Stockholders, page 28,
and is included in Part IV, Item 14, Exhibit 13, herein. At December 11, 1997,
there were approximately 8,790 holders of record of Energen's common stock. For
restrictions on Energen's present and future ability to pay dividends, see Note
3 to the Consolidated Financial Statements which is incorporated by reference
from the 1997 Annual Report to Stockholders and included in Part IV, Item 14,
Exhibit 13, herein.

At the date of this filing, Energen Corporation owns all the issued and
outstanding common stock of Alabama Gas Corporation.

ITEM 6.      SELECTED FINANCIAL AND COMMON STOCK DATA

The information regarding selected financial data is incorporated by reference
from the 1997 Annual Report to Stockholders, pages 52-53, and is included in
Part IV, Item 14, Exhibit 13, herein.


ITEM 7.      MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND
             RESULTS OF OPERATIONS

This information is incorporated by reference from the 1997 Annual Report to
Stockholders, pages 21-28, and is included in Part IV, Item 14, Exhibit 13,
herein.

ITEM 8.      FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA

The information required by this item for Energen Corporation and subsidiaries
is incorporated by reference from the 1997 Annual Report to Stockholders and is
included in Part IV, Item 14, Exhibit 13, herein. The information required by
this item for Alabama Gas Corporation is contained in Part IV, Item 14, herein.

ITEM 9.      CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING AND
             FINANCIAL DISCLOSURE

None



                                       11

<PAGE>   13



PART III

ITEM 10.      DIRECTORS AND EXECUTIVE OFFICERS OF THE REGISTRANT

Information regarding the executive officers of Energen is included in Part I.
The other information required by Item 10 is incorporated herein by reference
from Energen's definitive proxy statement for the Annual Meeting of Stockholders
to be held January 28, 1998. The proxy statement will be filed on or about
December 22, 1997.

ITEM 11.      EXECUTIVE COMPENSATION

The information regarding executive compensation is incorporated herein by
reference from Energen's definitive proxy statement for the Annual Meeting of
Stockholders to be held January 28, 1998.

ITEM 12.      SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT

A.  SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS

     The information regarding the security ownership of the beneficial owners
     of more than five percent of Energen's common stock is incorporated herein
     by reference from Energen's definitive proxy statement for the Annual
     Meeting of Stockholders to be held January 28, 1998.

B.  SECURITY OWNERSHIP OF MANAGEMENT

     The information regarding the security ownership of management is
     incorporated herein by reference from Energen's definitive proxy statement
     for the Annual Meeting of Stockholders to be held January 28, 1998.

ITEM 13.      CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS

The information regarding certain relationships and related transactions is
incorporated herein by reference from Energen's definitive proxy statement for
the Annual Meeting of Stockholders to be held January 28, 1998.












                                       12

<PAGE>   14



PART IV

ITEM 14.      EXHIBITS, FINANCIAL STATEMENT SCHEDULES, AND REPORTS ON FORM 8-K

A.  DOCUMENTS FILED AS PART OF THIS REPORT

     (1)   FINANCIAL STATEMENTS
           The financial statements listed in the accompanying Index to
           Financial Statements and Financial Statement Schedules are filed as
           part of this report and are included in Part IV, Item 14, Exhibit 13,
           herein.

     (2)   FINANCIAL STATEMENT SCHEDULES
           The financial statement schedules listed in the accompanying Index to
           Financial Statements and Financial Statement Schedules are filed as
           part of this report.

     (3)   EXHIBITS
           The exhibits listed on the accompanying Index to Exhibits are filed
           as part of this report.

B.  REPORTS ON FORM 8-K

     (1)   Form 8-K dated July 9, 1997, reporting a property acquisition by
           Taurus Exploration, Inc., the Company's oil and gas exploration and
           production subsidiary

     (2)   Form 8-K(A) dated August 11, 1997, reporting the commencement of a
           solicitation of consents to certain proposed amendments (i) to the
           Indenture dated as of January 1, 1992 among Energen and Boatmen's
           Trust Company, as trustee (The Trustee), pursuant to which Energen's
           8% Debentures due February 1, 2007 were issued and (ii) to the
           Indenture dated as of March 1, 1993 among Energen and the Trustee,
           pursuant to which Energen's Series 1993 Notes were issued.



           


                                       13

<PAGE>   15



                                   SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities and
Exchange Act of 1934, the Registrants have duly caused this report to be signed
on their behalf by the undersigned thereunto duly authorized.


                                    ENERGEN CORPORATION
                                       (Registrant)


                                  ALABAMA GAS CORPORATION
                                       (Registrant)



     December 17, 1997                      /s/Rex J. Lysinger
- ---------------------------                 ----------------------------------
         DATE                               Rex J. Lysinger
                                            Chairman of the Board of Directors






















                                       14

<PAGE>   16



                                   SIGNATURES


Pursuant to the requirements of the Securities and Exchange Act of 1934, this
report has been signed by the following persons on behalf of the Registrants and
in the capacities and on the dates indicated:



     December 17, 1997                 /s/Rex J. Lysinger
- -------------------------              ----------------------------------------
         DATE                          Rex J. Lysinger
                                       Chairman of the Board of Directors


     December 17, 1997                 /s/Wm. Michael Warren, Jr.
- -------------------------              ----------------------------------------
         DATE                          Wm. Michael Warren, Jr.
                                       President of Energen and Chief Executive 
                                       Officer and Director of Energen and 
                                       Alagasco


     December 17, 1997                 /s/Geoffrey C. Ketcham
- -------------------------              ----------------------------------------
         DATE                          Geoffrey C. Ketcham
                                       Executive Vice President, Chief
                                       Financial Officer and Treasurer


     December 17, 1997                 /s/Paula H. Rushing
- -------------------------              ----------------------------------------
         DATE                          Paula H. Rushing
                                       Vice President--Finance of Alagasco


     December 17, 1997                 /s/J. Mason Davis, Jr.
- -------------------------              ----------------------------------------
         DATE                          J. Mason Davis, Jr.
                                       Director


     December 17, 1997                 /s/James S. M. French
- -------------------------              ----------------------------------------
         DATE                          James S. M. French
                                       Director


     December 17, 1997                 /s/Judy M. Merritt
- -------------------------              ----------------------------------------
         DATE                          Judy M. Merritt
                                       Director


     December 17, 1997                 /s/Drayton Nabers, Jr.
- -------------------------              ----------------------------------------
         DATE                          Drayton Nabers, Jr.
                                       Director






                                       15

<PAGE>   17



                               ENERGEN CORPORATION
                             ALABAMA GAS CORPORATION
                          INDEX TO FINANCIAL STATEMENTS
                        AND FINANCIAL STATEMENT SCHEDULES

                                   ITEM 14(A)

<TABLE>
<CAPTION>
                                                                                            Reference Page
                                                                                            --------------
                                                                                                       1997
                                                                                            1997      Annual
                                                                                            10-K      Report
                                                                                            ----      ------
 
<S>  <C>                                                                                    <C>       <C>
1.   Financial Statements

     ENERGEN CORPORATION

              Report of Independent Certified Public Accountants......................                    50

              Consolidated statements of income for the years ended
              September 30, 1997, 1996 and 1995.......................................                    29

              Consolidated balance sheets as of September 30,
              1997 and 1996...........................................................                    30

              Consolidated statements of shareholders' equity for the years
              ended September 30, 1997, 1996 and 1995.................................                    32

              Consolidated statements of cash flows for the years ended
              September 30, 1997, 1996 and 1995.......................................                    33

              Notes to consolidated financial statements..............................                    34

     ALABAMA GAS CORPORATION

              Report of Independent Certified Public Accountants......................         21

              Statements of income for the years ended
              September 30, 1997, 1996 and 1995.......................................         22

              Balance sheets as of September 30, 1997 and 1996........................         23

              Statements of shareholder's equity for the years ended
              September 30, 1997, 1996 and 1995.......................................         25

              Statements of cash flows for the years ended
              September 30, 1997, 1996 and 1995.......................................         26

              Notes to financial statements...........................................         27
</TABLE>






                                       16

<PAGE>   18

<TABLE>
<CAPTION>
                                                                                            Reference Page
                                                                                            --------------
                                                                                                       1997
                                                                                            1997      Annual
                                                                                            10-K      Report
                                                                                            ----      ------
 
<S>  <C>                                                                                    <C>       <C>

2.   Financial Statement Schedules

     ENERGEN CORPORATION

              Report of Independent Certified Public Accountants......................         35

              Schedule II     Valuation and Qualifying Accountants....................         36

     ALABAMA GAS CORPORATION

              Schedule II     Valuation and Qualifying Accounts.......................         37
</TABLE>


Schedules other than those listed above are omitted for the reason that they are
not required or are not applicable, or the required information is shown in the
financial statements or notes thereto.













                                       17

<PAGE>   19



                               ENERGEN CORPORATION
                             ALABAMA GAS CORPORATION
                                INDEX TO EXHIBITS
                                  ITEM 14(A)(3)

<TABLE>
<CAPTION>
Exhibit
Number                                Description
- ------                                -----------

<S>         <C>                                                        
*3(a)       Restated Certificate of Incorporation of Energen Corporation
            (formerly Alagasco, Inc.) which was filed as Exhibit 4(a) to
            Energen's Registration Statement on Form S-8 (Registration No.
            33-14855).

*3(b)       Amendment to the Restated Certificate of Incorporation of Energen
            Corporation (formerly Alagasco, Inc.) adopted on July 18, 1985,
            which was filed as Exhibit 4(b) to Energen's Registration Statement
            on Form S-8 (Registration No. 33-14855).

*3(c)       Amendment to the Restated Certificate of Incorporation of Energen
            Corporation adopted on January 15, 1987, which was filed as Exhibit
            4(c) to Energen's Registration Statement on Form S-8 (Registration
            No. 33-14855).

*3(d)       Amendment to the Restated Certificate of Incorporation of Energen
            Corporation adopted on January 25, 1989, which was filed as Exhibit
            4(d) to Energen's Registration Statement on Form S-3 (Registration
            No. 33-70464).

*3(e)       Articles of Amendment to the Restated Certificate of Incorporation
            of Energen Corporation dated February 3, 1995, which was filed as
            Exhibit 3(e) to the Registrant's Annual Report on Form 10-K for the
            year ended September 30, 1995, (file No. 1-7810).

*3(f)       Restated Conformed Certificate of Incorporation of Energen
            Corporation, as amended through February 3, 1995, which was filed as
            Exhibit 3(f) to the Registrant's Annual Report on Form 10-K for the
            year ended September 30, 1995, (file No. 1-7810).

*3(g)       Certificate of Adoption of Resolutions designating Series A Junior
            Participating Preferred Stock (June 27, 1988) which was filed as
            Exhibit 4(e) to Energen's Registration Statement on Form S-2
            (Registration No. 33-25435).

*3(h)       Bylaws of Energen Corporation, which were filed as Exhibit 4(e) to
            Energen's Registration Statement on Form S-8 (Registration No.
            33-14855).

*3(i)       Articles of Amendment and Restatement of the Articles of
            Incorporation of Alabama Gas Corporation, dated September 27, 1995,
            which was filed as Exhibit 3(i) to the Registrant's Annual Report on
            Form 10-K for the year ended September 30, 1995, (file No. 1-7810).

*3(j)       By-Laws of Alabama Gas Corporation, which was filed as Exhibit 4(k)
            to Alabama Gas' Registration Statement on Form S-3 (Registration No.
            33-12841).

*4(a)       Rights Agreement, dated as of July 27, 1988, between Energen
            Corporation and AmSouth Bank, N.A., Rights Agent, which was filed as
            Exhibit 1 to Energen's Registration Statement on Form 8-A (File No.
            1-7810).

*4(b)       Amendment of Rights Agreement, dated as of February 28, 1990,
            between Energen Corporation and AmSouth Bank, N.A., Rights Agent,
            which was filed as Exhibit 2 to Energen's Form 8 Amendment No. 2 to
            its Registration Statement on Form 8-A (File No. 1-7810).
</TABLE>


                                       18

<PAGE>   20



<TABLE>
<S>         <C>                                                              
*4(c)       Indenture, dated as of January 1, 1992, between Energen Corporation
            and Boatmen's Trust Company, Trustee, which was filed as Exhibit 4
            to Energen's Amendment No. 1 to Registration Statement on Form S-3
            (Registration No. 33-44936).

*4(d)       Indenture, dated as of March 1, 1993, between Energen Corporation
            and Boatmen's Trust Company, Trustee, which was filed as Exhibit 4
            to Energen's Registration Statement on Form S-3 (Registration No.
            33-25435).

*4(e)       Form of Indenture between Energen Corporation and The Bank of New
            York, as Trustee, which was dated as of September 1, 1996, and which
            was filed as Exhibit 4(i) to the Registrant's Registration Statement
            on Form S-3 (Registration No. 333-11239).

*4(f)       Indenture dated as of November 1, 1993, between Alabama Gas
            Corporation and NationsBank of Georgia, National Association,
            Trustee, which was filed as Exhibit 4(k) to Alabama Gas's
            Registration Statement on Form S-3 (Registration No. 3370466).

*10(a)      Form of Service Agreement Under Rate Schedule CSS (No. S10710),
            between Southern Natural Gas Company and Alabama Gas Corporation as
            filed as Exhibit 10(a) to Energen's Annual Report on Form 10-K for
            the year ended September 30, 1993 (File No. 1-7810).

*10(b)      Form of Service Agreement Under Rate Schedule FT-NN (No. 866941),
            between Southern Natural Gas Company and Alabama Gas Corporation as
            filed as Exhibit 10(c) to Energen's Annual Report on Form 10-K for
            the year ended September 30, 1993 (File No. 1-7810).

*10(c)      Form of Executive Retirement Supplement Agreement between Energen
            Corporation and certain executive officers as filed as Exhibit 10(e)
            to Energen's Annual Report on Form 10-K for the year ended September
            30, 1996 (File No. 1-7810).

*10(d)      Form of Severance Compensation Agreement between Energen Corporation
            and certain executive officers as filed as Exhibit 10(g) to
            Energen's Annual Report on Form 10-K for the year ended September
            30, 1996 (File No. 1-7810).

*10(e)      Energen Corporation 1988 Stock Option Plan as filed as Exhibit 10(i)
            to Energen's Annual Report on Form 10-K for the year ended September
            30, 1993 (File 1-7810).

10(f)       Energen Corporation 1992 Long-Range Performance Share Plan, as
            amended April 25, 1997.

*10(g)      Energen Corporation 1997 Stock Incentive Plan, which was filed as
            Appendix A to Energen's Proxy Statement for its January 28, 1998,
            Annual Meeting (File No. 1-7810).

*10(h)      Energen Corporation 1997 Deferred Compensation Plan, which was filed
            as Appendix B to Energen's Proxy Statement for its January 28, 1998,
            Annual Meeting (File No. 1-7810).

*10(i)      Energen Corporation 1992 Directors Stock Plan, effective as of
            January 22, 1992, which was filed as Exhibit B to Energen's Proxy
            Statement for its January 22, 1992, Annual Meeting (File No.
            1-7810).

*10(j)      Amendment to Energen Corporation 1992 Directors Stock Plan, which
            was filed as Appendix B to Energen's Proxy Statement for its January
            24, 1996, Annual Meeting (File No. 1-7810).

*10(k)      Energen Corporation Director Fees Deferral Plan as filed as Exhibit
            10(l) to Energen's Annual Report on Form 10-K for the year ended
            September 30, 1993 (File No. 1-7810).
</TABLE>


                                       19

<PAGE>   21



<TABLE>
<S>         <C>
*10(l)      Energen Corporation Annual Incentive Compensation Plan, Revised
            5/90, as amended effective October 1, 1993, as filed as Exhibit
            10(m) to Energen's Annual Report on Form 10-K for the year ended
            September 30, 1994 (File No. 1-7810).

13          Information incorporated by reference from pages 21-55 of the
            Energen Corporation 1997 Annual Report to Stockholders

21          Subsidiaries of Energen Corporation

23          Consent of Independent Certified Public Accountants (Energen
            Corporation)

27.1        Financial Data Schedule of Energen Corporation (for SEC purposes
            only)

27.2        Financial Data Schedule of Alabama Gas Corporation (for SEC purposes
            only)
</TABLE>


*Incorporated by reference











                                       20

<PAGE>   22



REPORT OF INDEPENDENT CERTIFIED PUBLIC ACCOUNTANTS

TO THE BOARD OF DIRECTORS OF ALABAMA GAS CORPORATION:

We have audited the financial statements and the financial statement schedule of
Alabama Gas Corporation listed in the index on pages 16 and 17 of this Form
10-K. These financial statements and the financial statement schedule are the
responsibility of the Company's management. Our responsibility is to express an
opinion on these financial statements and the financial statement schedule based
on our audits.

We conducted our audits in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements are free of material
misstatement. An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements. An audit also includes
assessing the accounting principles used and significant estimates made by
management, as well as evaluating the overall financial statement presentation.
We believe that our audits provide a reasonable basis for our opinion.

In our opinion, the financial statements referred to above present fairly, in
all material respects, the financial position of Alabama Gas Corporation as of
September 30, 1997 and 1996, and the results of its operations and its cash
flows for each of the three years in the period ended September 30, 1997, in
conformity with generally accepted accounting principles. In addition, in our
opinion, the financial statement schedule referred to above, when considered in
relation to the basic financial statements taken as a whole, presents fairly, in
all material respects, the information required to be included therein.




Coopers & Lybrand L.L.P.
Birmingham, Alabama
October 23, 1997

























                                       21

<PAGE>   23



STATEMENTS OF INCOME
ALABAMA GAS CORPORATION

<TABLE>
<CAPTION>
===============================================================================

YEARS ENDED SEPTEMBER 30, (IN THOUSANDS)       1997         1996        1995
===============================================================================


<S>                                           <C>          <C>        <C>     
OPERATING REVENUES                            $362,984     $357,252   $295,967
- -------------------------------------------------------------------------------


OPERATING EXPENSES
Cost of gas                                    177,837      181,400    133,556
Operations                                      85,119       81,585     78,139
Maintenance                                     11,092       10,956      9,727
Depreciation                                    23,486       21,269     19,370
Income taxes
    Current                                     11,223        8,699      8,392
    Deferred, net                                 (618)         835        177
    Deferred investment tax credits, net          (487)        (487)      (487)
Taxes, other than income taxes                  26,658       26,772     22,662
- -------------------------------------------------------------------------------


       Total operating expenses                334,310      331,029    271,536
- -------------------------------------------------------------------------------


OPERATING INCOME                                28,674       26,223     24,431
- -------------------------------------------------------------------------------


OTHER INCOME
Allowance for funds used during construction       490          972      1,054
Other, net                                         215         (649)      (112)
- -------------------------------------------------------------------------------


       Total other income                          705          323        942
- -------------------------------------------------------------------------------


INTEREST CHARGES
Interest on long-term debt                       8,843        7,390      7,730
Other interest expense                           1,966        2,195      1,922
- -------------------------------------------------------------------------------


       Total interest charges                   10,809        9,585      9,652
- -------------------------------------------------------------------------------


NET INCOME AVAILABLE FOR COMMON               $ 18,570     $ 16,961   $ 15,721
- -------------------------------------------------------------------------------
</TABLE>














The accompanying Notes to Financial Statements are an integral part of these
statements.


                                       22

<PAGE>   24



BALANCE SHEETS
ALABAMA GAS CORPORATION

<TABLE>
<CAPTION>
================================================================================

AS OF  SEPTEMBER 30, (IN THOUSANDS)                1997              1996
================================================================================

<S>                                             <C>              <C>        
ASSETS
 
PROPERTY, PLANT AND EQUIPMENT
Utility plant                                   $   583,630      $   544,643
Less accumulated depreciation                       287,749          268,110
- --------------------------------------------------------------------------------

    Utility plant, net                              295,881          276,533
- --------------------------------------------------------------------------------

Other property, net                                     347              394
- --------------------------------------------------------------------------------

CURRENT ASSETS
Cash                                                  2,580              803
Accounts receivable
    Gas                                              36,098           26,999
    Merchandise                                       2,001            1,730
    Other                                             1,442            2,955
    Affiliated companies                                 --           10,582
    Allowance for doubtful accounts                  (3,156)          (2,985)
Inventories, at average cost
    Storage gas inventory                            25,367           28,214
    Materials and supplies                            5,391            5,828
    Liquefied natural gas in storage                  3,630            2,417
Deferred gas costs                                    2,512            1,975
Deferred income taxes                                 5,675            6,344
Prepayments and other                                 6,696            4,561
- --------------------------------------------------------------------------------

       Total current assets                          88,236           89,423
- --------------------------------------------------------------------------------

DEFERRED CHARGES AND OTHER ASSETS                     5,917            7,467
- --------------------------------------------------------------------------------

TOTAL ASSETS                                    $   390,381      $   373,817
================================================================================
</TABLE>

















The accompanying Notes to Financial Statements are an integral part of these
statements.

                                       23

<PAGE>   25



BALANCE SHEETS
ALABAMA GAS CORPORATION

<TABLE>
<CAPTION>
======================================================================================

AS OF SEPTEMBER 30, (IN THOUSANDS)                       1997              1996
======================================================================================
<S>                                                   <C>              <C>        

CAPITAL AND LIABILITIES

CAPITALIZATION
Common shareholder's equity
    Common stock, $0.01 par value; 
       3,000,000 shares authorized,
       1,972,052 shares outstanding 
       in 1997 and 1996                               $        20      $        20
    Premium on capital stock                               31,682           31,682
    Capital surplus                                         2,802            2,802
    Retained earnings                                     106,894           95,044
- --------------------------------------------------------------------------------------

    Total common shareholder's equity                     141,398          129,548
Long-term debt                                            125,000          125,000
- --------------------------------------------------------------------------------------

       Total capitalization                               266,398          254,548
- --------------------------------------------------------------------------------------

CURRENT LIABILITIES
Notes payable to banks                                     11,000               --
Accounts payable
    Trade                                                  28,923           23,758
    Affiliated companies                                    4,984            1,512
Accrued taxes                                              16,745           18,067
Customers' deposits                                        16,399           17,364
Supplier refunds due customers                                 --           16,668
Other amounts due customers                                 7,347              489
Accrued wages and benefits                                  3,879            4,459
Other                                                      10,481           10,611
- --------------------------------------------------------------------------------------

       Total current liabilities                           99,758           92,928
- --------------------------------------------------------------------------------------

DEFERRED CREDITS AND OTHER LIABILITIES
Deferred income taxes                                      16,739           16,883
Accumulated deferred investment tax credits                 3,130            3,617
Regulatory liability                                        3,651            5,038
Customer advances for construction and other                  705              803
- --------------------------------------------------------------------------------------

       Total deferred credits and other liabilities        24,225           26,341
- --------------------------------------------------------------------------------------

TOTAL CAPITAL AND LIABILITIES                         $   390,381      $   373,817
======================================================================================
</TABLE>










The accompanying Notes to Financial Statements are an integral part of these
statements.

                                       24

<PAGE>   26



STATEMENTS OF SHAREHOLDER'S EQUITY
ALABAMA GAS CORPORATION

<TABLE>
<CAPTION>
===================================================================================================================

(IN THOUSANDS, EXCEPT SHARE AMOUNTS)
===================================================================================================================

                                                    COMMON STOCK
                                                    ------------
                                                 NUMBER OF     PAR         PREMIUM ON       CAPITAL     RETAINED
                                                  SHARES      VALUE       CAPITAL STOCK     SURPLUS     EARNINGS
- -------------------------------------------------------------------------------------------------------------------

<S>                                               <C>         <C>         <C>            <C>           <C>      
BALANCE AT SEPTEMBER 30, 1994                     1,972,052   $  20       $  31,682      $   2,802     $  81,087
Net income                                                                                                15,721
Cash dividends                                                                                            (9,170)
- -------------------------------------------------------------------------------------------------------------------

BALANCE AT SEPTEMBER 30, 1995                     1,972,052      20          31,682          2,802        87,638
Net income                                                                                                16,961
Cash dividends                                                                                            (9,555)
- -------------------------------------------------------------------------------------------------------------------

BALANCE AT SEPTEMBER 30, 1996                     1,972,052      20          31,682          2,802        95,044
Net income                                                                                                18,570
Cash dividends                                                                                            (6,720)
- -------------------------------------------------------------------------------------------------------------------

BALANCE AT SEPTEMBER 30, 1997                     1,972,052   $  20       $  31,682      $   2,802     $ 106,894
===================================================================================================================
</TABLE>































The accompanying Notes to Financial Statements are an integral part of these
statements.


                                       25

<PAGE>   27



STATEMENTS OF CASH FLOWS
ALABAMA GAS CORPORATION

<TABLE>
<CAPTION>
===================================================================================================================

YEARS ENDED SEPTEMBER 30, (IN THOUSANDS)                             1997             1996              1995
===================================================================================================================
<S>                                                              <C>               <C>              <C>        
OPERATING ACTIVITIES
Net Income                                                       $    18,570       $    16,961      $    15,721
Adjustments to reconcile net income to net cash
  provided by operating activities:
    Depreciation and amortization                                     23,486            21,269           19,370
    Deferred income taxes, net                                          (618)              835              177
    Deferred investment tax credits                                     (487)             (487)            (487)
    Net change in:
       Accounts receivable                                            (7,686)           (5,539)            (113)
       Inventories                                                     2,071            (6,784)           3,725
       Deferred gas costs                                               (537)             (549)              34
       Accounts payable-- gas purchase                                 5,758            (1,614)           9,882
       Accounts payable-- other trade                                   (593)             (788)          (2,856)
       Other current assets and liabilities                          (15,012)           12,048           (3,057)
    Other, net                                                         1,124            (1,019)             673
- -------------------------------------------------------------------------------------------------------------------

       Net cash provided by operating activities                      26,076            34,333           43,069
- -------------------------------------------------------------------------------------------------------------------

INVESTING ACTIVITIES
Additions to property, plant and equipment                           (43,724)          (42,037)         (41,560)
Net advances (to) from parent company                                 14,054            (8,871)            (199)
Other, net                                                             1,091             1,377              (15)
- -------------------------------------------------------------------------------------------------------------------

       Net cash used in investing activities                         (28,579)          (49,531)         (41,774)
- -------------------------------------------------------------------------------------------------------------------

FINANCING ACTIVITIES
Payment of dividends on common stock                                  (6,720)           (9,555)          (9,170)
Reduction of long-term debt and preferred stock                           --                --          (37,214)
Proceeds from medium-term notes                                           --            24,829           49,660
Net change in short-term debt                                         11,000                --           (4,000)
- -------------------------------------------------------------------------------------------------------------------

       Net cash provided by (used in) financing activities             4,280            15,274             (724)
- -------------------------------------------------------------------------------------------------------------------

Net change in cash and cash equivalents                                1,777                76              571
Cash and cash equivalents at beginning of period                         803               727              156
- -------------------------------------------------------------------------------------------------------------------

Cash and cash equivalents at end of period                       $     2,580       $       803      $       727
===================================================================================================================
</TABLE>











The accompanying Notes to Financial Statements are an integral part of these
statements.

                                       26

<PAGE>   28



NOTES TO FINANCIAL STATEMENTS

1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
- --------------------------------------------------------------------------------

Alabama Gas Corporation (Alagasco), a wholly-owned subsidiary of Energen
Corporation (the Company), is the largest natural gas distribution utility in
the State of Alabama, serving customers primarily in central and north Alabama.
The following is a description of its significant accounting policies and
practices.

A.    UTILITY PLANT AND DEPRECIATION: Property, plant and equipment is stated at
      cost. The cost of utility plant includes an allowance for funds used
      during construction. Maintenance is charged for the cost of normal repairs
      and the renewal or replacement of an item of property which is less than a
      retirement unit. When property which represents a retirement unit is
      replaced or removed, the cost of such property is credited to utility
      plant and, together with the cost of removal less salvage, is charged to
      the accumulated reserve for depreciation. Depreciation is provided on the
      straight-line method over the estimated useful lives of utility property
      at rates established by the Alabama Public Service Commission (APSC).
      Approved depreciation rates averaged approximately 4.4 percent in 1997 and
      4.3 percent in 1996 and 1995.

B.    INVENTORIES: Inventories, which consist primarily of gas stored
      underground, are stated at average cost.

C.    OPERATING REVENUE AND GAS COSTS: In accordance with industry practice,
      Alagasco records natural gas distribution revenues on a monthly- and
      cycle-billing basis. The commodity cost of purchased gas applicable to gas
      delivered to customers but not yet billed under the cycle-billing method
      is deferred as a current asset.

D.    REGULATORY ACCOUNTING: Alagasco is subject to the provisions of Statement
      of Financial Accounting Standard (SFAS) No. 71, Accounting for the Effects
      of Certain Types of Regulation. In general, SFAS No. 71 allows utilities
      to capitalize or defer certain costs or revenues, based upon orders
      received from regulatory authorities, to be recovered from or refunded to
      customers in future periods.

E.    INCOME TAXES: Alagasco files a consolidated income tax return with its
      parent. The consolidated income taxes are allocated to the appropriate
      subsidiaries using the separate return method. Deferred income taxes
      reflect the impact of temporary differences between the tax basis of
      assets and liabilities and their carrying amounts for financial reporting
      purposes and are measured in compliance with enacted tax laws. Investment
      tax credits have been deferred and are being amortized over the lives of
      the related assets.

F.    CASH EQUIVALENTS: Alagasco includes highly liquid marketable securities
      and debt instruments purchased with a maturity of three months or less in
      cash equivalents.

G.    ESTIMATES: The preparation of financial statements in conformity with
      generally accepted accounting principles requires management to make
      estimates and assumptions that affect the reported amounts of assets and
      liabilities at the date of the financial statements and the reported
      amount of revenues and expenses during the reporting period. Actual
      results could differ from those estimates.

2.    REGULATORY MATTERS
- --------------------------------------------------------------------------------

As an Alabama utility, Alagasco is subject to regulation by the APSC which, in
1983, established the Rate Stabilization and Equalization (RSE) rate-setting
process. RSE was extended with modifications in 1985, 1987 and 1990. On October
7, 1996, RSE was extended, without change, for a five-year period through
January 1, 2002. Under the terms of that extension, RSE will continue after
January 1, 2002, unless, after notice to the Company and a hearing, the
Commission votes to either modify or discontinue its operation.

Under RSE as extended, the APSC conducts quarterly reviews to determine, based
on Alagasco's projections and fiscal year-to-date performance, whether
Alagasco's return on equity for the fiscal year will be within the allowed range
of 13.15 percent to 13.65 percent. Reductions in rates can be made quarterly to
bring the projected return within the allowed range; increases, however, are
allowed only once each fiscal year, effective December 1, and cannot exceed



                                       27

<PAGE>   29



4 percent of prior-year revenues. RSE limits the utility's equity upon which a
return is permitted to 60 percent of total capitalization and provides for
certain cost control measures designed to monitor Alagasco's operations and
maintenance (O&M) expense. If the change in O&M expense per customer falls
within 1.25 percentage points above or below the Consumer Price Index For All
Urban Customers (index range), no adjustment is required. If, however, the
change in O&M expense per customer exceeds the index range, three-quarters of
the difference is returned to customers. To the extent the change is less than
the index range, the utility benefits by one-half of the difference through
future rate adjustments. Under RSE as extended, a $1.3 million annual decrease
in revenue became effective October 1, 1996, a $7.7 million annual increase
became effective December 1, 1996, and a $1.5 million annual decrease became
effective April 1, 1997.

Alagasco calculates a temperature adjustment to customers' monthly bills to
remove the effect of departures from normal temperature on Alagasco's earnings.
The calculation is performed monthly, and the adjustments to customers bills are
made in the same billing cycle the weather variation occurs. Alagasco's rate
schedules for natural gas distribution charges contain a Gas Supply Adjustment
(GSA) rider, established in 1993, which permits the pass-through to customers of
changes in the cost of gas supply, including Gas Supply Realignment (GSR)
surcharges imposed by Alagasco's suppliers resulting from changes in gas supply
purchases related to the implementation of Federal Energy Regulatory Commission
(FERC) Order 636. The APSC on October 7, 1996, issued an order providing for the
refund to customers prior to January 31, 1997 of approximately $17 million of
supplier refunds, including interest. The Company refunded these amounts to
customers during January 1997. The refunds were collected from a variety of
sources and most relate to the settlement of rate case and FERC Order 636
proceedings of Southern Natural Gas Company (Southern) as described herein. On
September 9, 1996, the APSC approved Alagasco's application to issue $25 million
of debt, a portion of which was used to fund these supplier refunds.

In accordance with APSC-directed regulatory accounting procedures, Alagasco in
1989 began returning to customers excess utility deferred taxes which resulted
from a reduction in the federal statutory tax rate from 46 percent to 34 percent
using the average rate assumption method. This method provides for the return to
ratepayers of excess deferred taxes over the lives of the related assets. In
1993 those excess taxes were reduced as a result of a federal tax rate increase
from 34 percent to 35 percent. Remaining excess utility deferred taxes of $2.1
million are being returned to ratepayers over approximately 13 years. At
September 30, 1997 and 1996, a regulatory liability related to income taxes of
$3.7 million and $5 million, respectively, was included in the consolidated
financial statements.

The excess of total acquisition costs over book value of net assets of acquired
municipal gas distribution systems is included in utility plant and is being
amortized on a straight-line basis over approximately 23 years. At September 30,
1997 and 1996, the net acquisition adjustment was $16.4 million and $16.7
million, respectively.

FERC REGULATION: In 1995 Southern filed a comprehensive settlement with the FERC
in the form of a Stipulation and Agreement (the Settlement) to resolve all
issues in Southern's six then-pending rate cases as well as to resolve all GSR
and transition cost issues resulting from the implementation of FERC Order 636.
Alagasco was a supporting party to the Settlement. The Settlement, as approved
by the FERC, resolves all issues relating to GSR and other transition costs with
respect to supporting parties. Alagasco estimates that it has a remaining GSR
liability of approximately $0.1 million to be paid through December 1998 and
approximately $0.7 million in other transition costs to be paid through June
1998. Because these costs will be recovered in full from its customers, Alagasco
recorded a regulatory asset of $0.8 million and $2.2 million at September 30,
1997 and 1996, respectively.

3. LONG-TERM DEBT AND NOTES PAYABLE
- --------------------------------------------------------------------------------
Long-term debt consists of the following:
- --------------------------------------------------------------------------------

<TABLE>
<CAPTION>
As of September 30, (in thousands)                      1997           1996
- --------------------------------------------------------------------------------
<S>                                                   <C>            <C>
Medium-term Notes, interest ranging from 
   5.4% to 7.97%, for notes
   redeemable December 1, 1998, 
   to September 23, 2026                              $ 125,000      $ 125,000
Less amounts due within one year                             --             --
- --------------------------------------------------------------------------------
  Total                                               $ 125,000      $ 125,000
- --------------------------------------------------------------------------------
</TABLE>


                                       28

<PAGE>   30



The aggregate maturities of long-term debt for the next five years are as
follows:

<TABLE>
<CAPTION>
- --------------------------------------------------------------------------------
                    Years ending September 30, (in thousands)
- --------------------------------------------------------------------------------

      1998           1999            2000            2001             2002
- --------------------------------------------------------------------------------

<S>               <C>             <C>             <C>               <C>     
   $   --         $ 5,350         $   --          $ 4,650           $  5,000
- --------------------------------------------------------------------------------
</TABLE>


Energen and Alagasco have short-term credit lines and other credit facilities of
$203 million available to either entity for working capital needs. The following
is a summary of information relating to notes payable to banks:

<TABLE>
<CAPTION>
- -------------------------------------------------------------------------------------

As of September 30, (in thousands)                  1997        1996         1995
- -------------------------------------------------------------------------------------

<S>                                              <C>          <C>           <C>     
Alagasco outstanding                             $ 11,000     $     --      $     --
Other Energen outstanding                         141,000       59,000        32,300
- -------------------------------------------------------------------------------------

Notes payable to banks                            152,000       59,000        32,300
Available for borrowings                           51,000       97,000        77,700
- -------------------------------------------------------------------------------------

  Total                                          $203,000     $156,000      $110,000
- -------------------------------------------------------------------------------------


Maximum amount outstanding at any month-end      $ 41,000     $ 22,000      $  5,000
Average daily amount outstanding                 $  9,962     $  6,672      $    447
Weighted average interest rates based on:
  Average daily amount outstanding                   5.83%        5.73%         5.69%
  Amount outstanding at year-end                     5.99%          --            --
- -------------------------------------------------------------------------------------
</TABLE>


Total interest expense for Alagasco in 1997, 1996 and 1995 was $10,809,000,
$9,585,000, and $9,652,000, respectively.

4. INCOME TAXES
- --------------------------------------------------------------------------------


The components of income taxes consist of the following:

- --------------------------------------------------------------------------------

<TABLE>
<CAPTION>
For the years ended September 30, (in thousands)   1997        1996      1995
- --------------------------------------------------------------------------------
<S>                                               <C>         <C>       <C>
Taxes estimated to be payable currently:
                                                                                
   Federal                                        $ 10,219    $7,924    $7,633
   State                                             1,004       775       759
- --------------------------------------------------------------------------------

      Total current                                 11,223     8,699     8,392
- --------------------------------------------------------------------------------

Taxes deferred:
    Federal                                         (1,050)      274      (326)
    State                                              (55)       74        16
- --------------------------------------------------------------------------------

      Total deferred                                (1,105)      348      (310)
- --------------------------------------------------------------------------------

Total income tax expense                          $ 10,118    $9,047    $8,082
- --------------------------------------------------------------------------------
</TABLE>


                                       29

<PAGE>   31



Temporary differences and carry forwards which give rise to a significant
portion of deferred tax assets and liabilities for 1997 and 1996 are as follows:

<TABLE>
<CAPTION>
- -------------------------------------------------------------------------------------------------------------------

As of September 30, (in thousands)                            1997                              1996
- -------------------------------------------------------------------------------------------------------------------

                                                   Current        Noncurrent            Current         Noncurrent
                                                  ---------------------------        ------------------------------
<S>                                               <C>            <C>                 <C>            <C>         
Deferred tax assets:
    Deferred investment tax credits               $       --     $      1,024        $        --    $      1,205
    Regulatory liabilities                                --            1,356                 --           1,872
    Unbilled revenue                                   1,699               --              1,658              --
    Insurance and accruals                             2,854               --              2,239              --
    Inventories                                          520               --                310              --
    Accrued vacation                                      --               --              1,067              --
    Allowance for uncollectible accounts               1,173               --              1,268              --
    Other, net                                         1,474              156              1,990              74
- -------------------------------------------------------------------------------------------------------------------
    Subtotal                                           7,720            2,536              8,532           3,151
    Valuation allowance                                   --               --                 --              --
- -------------------------------------------------------------------------------------------------------------------
       Total deferred tax assets                       7,720            2,536              8,532           3,151
- -------------------------------------------------------------------------------------------------------------------
Deferred tax liabilities:
    Depreciation and basis differences                    --           18,349                 --          19,087
    Gas supply adjustment                              1,308               --                500              --
    Other, net                                           737              926              1,688             947
- -------------------------------------------------------------------------------------------------------------------
       Total deferred tax liabilities                  2,045           19,275              2,188          20,034
- -------------------------------------------------------------------------------------------------------------------
Net deferred tax assets (liabilities)             $    5,675     $    (16,739)        $    6,344    $    (16,883)
- -------------------------------------------------------------------------------------------------------------------
</TABLE>

No valuation allowance with respect to deferred taxes is deemed necessary as
Alagasco anticipates generating adequate future taxable income to realize the
benefits of all deferred tax assets on Alagasco's balance sheet.

Total income tax expense differs from the amount which would be provided by
applying the statutory federal income tax rate to earnings before taxes as
illustrated below:

<TABLE>
<CAPTION>
- -------------------------------------------------------------------------------------------------------------------
For the years ended September 30, (in thousands)                         1997            1996          1995
- -------------------------------------------------------------------------------------------------------------------
<S>                                                                   <C>            <C>            <C>
Income tax expense at statutory federal income tax rate               $   10,042     $   9,103      $   8,331
Increase (decrease) resulting from:
   Investment tax credits-deferred                                          (487)         (487)          (487)
  State income taxes, net of federal income tax benefit                      617           559            512
  Other, net                                                                 (54)         (128)          (274)
- -------------------------------------------------------------------------------------------------------------------
Total income tax expense                                              $   10,118     $   9,047      $   8,082
- -------------------------------------------------------------------------------------------------------------------
</TABLE>


There were no tax-related balances due to affiliates at September 30, 1997 or
1996.

5. EMPLOYEE BENEFIT PLANS
- --------------------------------------------------------------------------------

All information presented concerning retirement income and other benefit plans
includes other affiliates of Energen Corporation as well as Alagasco.

The Company has two defined benefit non-contributory pension plans which cover a
majority of the employees. Benefits are based on years of service and final
earnings. The Company's policy is to use the projected unit credit actuarial
method for funding and financial reporting purposes. The expense for the plan
covering the majority of employees (Plan A) for the years ended September 30,
1997, 1996 and 1995 was $1,228,000, $412,000, and $1,158,000, respectively. The
expense for the second plan covering employees under certain labor union
agreements (Plan B) for 1997, 1996 and 1995 was $437,000, $197,000, and
$339,000, respectively.

                                       30

<PAGE>   32



The funded status of the plans is as follows:

<TABLE>
<CAPTION>
- ----------------------------------------------------------------------------------------------------------------------------
As of June 30, (in thousands)                                                        Plan A                     Plan B
- ----------------------------------------------------------------------------------------------------------------------------
                                                                                1997         1996        1997         1996
                                                                            -----------------------   ----------------------
<S>                                                                          <C>          <C>          <C>          <C>
Vested benefits                                                              $(57,617)    $(56,828)    $(14,610)    $(14,210)
Nonvested benefits                                                             (4,739)      (4,323)      (2,256)      (2,336)
- ----------------------------------------------------------------------------------------------------------------------------
Accumulated benefit obligation                                                (62,356)     (61,151)     (16,866)     (16,546)
Effects of salary progression                                                 (11,402)     (12,607)          --           --
- ----------------------------------------------------------------------------------------------------------------------------

Projected benefit obligation                                                  (73,758)     (73,758)     (16,866)     (16,546)
Fair value of plan assets, primarily equity and
   fixed income securities                                                     84,859       80,750       20,820       18,358
Unrecognized net gain (loss)                                                   (6,477)        (337)      (2,747)        (433)
Unrecognized prior service cost                                                    29           35          998        1,205
Unrecognized net transition obligation (asset)                                 (3,494)      (4,303)         282          340
- ----------------------------------------------------------------------------------------------------------------------------

Accrued pension asset                                                        $  1,159     $  2,387     $  2,487     $  2,924
- ----------------------------------------------------------------------------------------------------------------------------
</TABLE>


At September 30, 1996, for both plans the discount rate used to measure the
projected benefit obligation was 7.75 percent, and the expected long-term rate
of return on plan assets was 8.25 percent. The annual rate of salary increase
for the salaried plan was 5.75 percent in both years.

The components of net pension expense for 1997, 1996 and 1995 were:

<TABLE>
<CAPTION>
- --------------------------------------------------------------------------------------------------------------------------
For the years ended September 30, (in thousands)               Plan A                                 Plan B
- --------------------------------------------------------------------------------------------------------------------------
                                                    1997        1996         1995         1997          1996      1995
                                                 ----------------------------------     ----------------------------------
<S>                                              <C>          <C>          <C>          <C>          <C>          <C>     
Service Cost                                     $  2,227     $  2,147     $  2,052     $    243     $    255     $    224
Interest cost on projected benefit obligation       5,524        4,617        4,728        1,238        1,166        1,095
Actual (return) on plan assets                    (12,629)     (15,280)      (8,787)      (3,803)      (2,971)      (2,172)
Net amortization and deferral                       6,106        8,928        2,106        2,759        1,747        1,192
Loss due to special termination benefits               --           --        1,489           --           --           --
Settlement gain                                        --           --         (430)          --           --           --
- --------------------------------------------------------------------------------------------------------------------------
Net pension expense                              $  1,228     $    412     $  1,158     $    437     $    197     $    339
- --------------------------------------------------------------------------------------------------------------------------
</TABLE>


In 1995 the Company recognized a loss for special termination benefits of
$1,489,000 and a settlement gain of $430,000 pursuant to a voluntary early
retirement option offered to all salaried, non-officer employees of at least 58
years of age with a minimum of 5 years service. Of the 55 eligible employees, 41
accepted.

The Company has deferred compensation plan agreements with certain key
executives providing for payments on retirement, termination, death or
disability. Expense under these agreements for 1997, 1996 and 1995 was $399,000,
$1,002,000, and $808,000, respectively. At June 30, 1997 and 1996, the
accumulated post-retirement benefit obligation related to these agreements was
$5,961,000 and $6,206,000, respectively, and the projected benefit obligation
was $9,839,000 and $9,442,000, respectively. A prepaid post-retirement benefit
asset of $499,000 was recorded at June 30, 1997, and an accrued post-retirement
benefit liability of $464,000 was recorded at June 30, 1996.

In addition to providing pension benefits, the Company provides certain
post-retirement health care and life insurance benefits. Substantially all of
the Company's employees may become eligible for such benefits if they reach
normal retirement age while working for the Company. While the Company has not
adopted a formal funding policy, all of its accrued post-retirement liability
was funded at year-end. The expense for salaried employees for the years ended
September 30, 1997, 1996, and 1995 was $2,221,000, $1,984,000, and $2,271,000,
respectively. The expense for union employees was $4,204,000, $4,076,000, and
$3,613,000 during 1997, 1996 and 1995, respectively. The projected unit credit
actuarial method was used to determine the normal cost and actuarial liability.





                                       31

<PAGE>   33



A reconciliation of the estimated status of the obligation is as follows:

<TABLE>
<CAPTION>
- -----------------------------------------------------------------------------------------------------------------------------------
As of June 30, (in thousands)                                                          Salaried Employees         Union Employees
- -----------------------------------------------------------------------------------------------------------------------------------
                                                                                      1997        1996         1997          1996
                                                                                   ---------------------     ----------------------
<S>                                                                                 <C>          <C>          <C>          <C>
Retirees                                                                            $ (9,590)    $(10,344)    $(14,529)    $(14,982)
Active, fully-eligible                                                                (2,121)      (1,574)      (4,340)      (4,011)
Other active                                                                          (8,309)      (7,989)     (14,151)     (14,415)
- -----------------------------------------------------------------------------------------------------------------------------------
Accumulated post-retirement benefit obligation                                       (20,020)     (19,907)     (33,020)     (33,408)
Fair value of plan assets, primarily equity and
  fixed income securities                                                             23,719       17,519       13,363        8,399
Unamortized amounts                                                                   (4,686)       1,210       17,405       23,394
- -----------------------------------------------------------------------------------------------------------------------------------
Accrued post-retirement benefit liability                                           $   (987)    $ (1,178)    $ (2,252)    $ (1,615)
- -----------------------------------------------------------------------------------------------------------------------------------
</TABLE>

Net periodic post-retirement benefit cost for the years ended September 30,
1997, 1996, and 1995 included the following:

<TABLE>
<CAPTION>
- -----------------------------------------------------------------------------------------------------------------------------------
For the years ended September 30, (in thousands)                             Salaried Employees               Union Employees
- -----------------------------------------------------------------------------------------------------------------------------------
                                                                        1997      1996      1995        1997       1996      1995
                                                                     -----------------------------   ------------------------------
<S>                                                                    <C>        <C>       <C>        <C>        <C>       <C>
Service cost                                                           $     979  $    516  $    512   $  1,198   $   876   $   807
Interest cost on accumulated post-retirement
  benefit obligation                                                       2,204     1,679     1,696      2,542     2,195     1,793
Amortization of transition obligation                                        723       723       723      1,285     1,285     1,285
Amortization of actuarial gains and losses                                  (568)     (277)       --         --        --        --
Deferred asset (gain) loss                                                 3,682       658       539      2,006       177       424
Actual (return) on plan assets                                            (4,799)   (1,315)   (1,199)    (2,827)     (457)     (696)
- -----------------------------------------------------------------------------------------------------------------------------------

Net periodic post-retirement benefit expense                           $   2,221  $  1,984  $  2,271   $  4,204   $ 4,076   $ 3,613
- -----------------------------------------------------------------------------------------------------------------------------------
</TABLE>


The weighted average discount rate used in determining the accumulated
post-retirement benefit obligation was 7.75 percent in 1997 and 1996. The
expected long-term rate of return on assets is 8.25 percent for both years, and
the tax rate on investment income is assumed to be 40 percent. The weighted
average health care cost trend rate used in determining the accumulated
post-retirement benefit obligation was 8.25 percent and 8 percent in 1997 and
1996, respectively. That assumption has a significant effect on the amounts
reported. For example, with respect to salaried employees, increasing the
weighted average health care cost trend rate by 1 percent would increase the
accumulated post-retirement benefit obligation by 2.4 percent and the net
periodic post-retirement benefit cost by 2.2 percent. For union employees,
increasing the weighted average health care cost trend rate by 1 percent would
increase the accumulated post-retirement benefit obligation by 7.5 percent and
the net periodic post-retirement benefit cost by 7.2 percent. For pay-related
life insurance benefits, the salary scale averages 5.75 percent and 5 percent in
1997 and 1996, respectively.

For both defined benefit plans and other post-retirement plans, certain
financial assumptions are used in determining the Company's projected benefit
obligation. These assumptions are examined periodically by the Company and any
required changes are reflected in the subsequent determination of projected
benefit obligations.

The Company has a long-term disability plan covering most salaried employees.
Expense for the years ended September 30, 1997, 1996, and 1995 was $163,000,
$370,000, and $155,000, respectively.

6. CAPITAL STOCK
- --------------------------------------------------------------------------------

Alagasco's authorized common stock consists of 3 million, $0.01 par value common
shares. At September 30, 1997 and 1996, 1,972,052 shares were issued and
outstanding. Alagasco is authorized to issue 120,000 shares of preferred stock
par value $0.01 per share, in one or more series. There are no shares currently
outstanding.


                                       32

<PAGE>   34



7. COMMITMENTS AND CONTINGENCIES
- --------------------------------------------------------------------------------

CONTRACTS AND AGREEMENTS: Alagasco has various firm gas supply and firm gas
transportation contracts which expire at various dates through the year 2008.
These contracts typically contain minimum demand charge obligations on the part
of Alagasco.

ENVIRONMENTAL MATTERS: Alagasco is in the chain of title of eight former
manufactured gas plant sites, of which it still owns four, and five manufactured
gas distribution sites, of which it still owns one. A preliminary investigation
of the sites does not indicate the present need for remediation activities.
Management expects that, should remediation of any such sites be required in the
future, Alagasco's share, if any, of such costs will not materially affect the
results of operations or financial condition of Alagasco.

LEGAL MATTERS: Alagasco is from time to time party to various pending or
threatened legal proceedings. Certain of these lawsuits include claims for
punitive damages in addition to other specified relief. Based upon information
presently available, and in light of available legal and other defenses,
contingent liabilities arising from threatened and pending litigation are not
considered material in relation to the financial position of Alagasco. It should
be noted, however, that Alagasco conducts business in Alabama and other
jurisdictions in which the magnitude and frequency of punitive damage awards
bearing little or no relation to culpability or actual damages continue to rise
making it increasingly difficult to predict litigation results. Various legal
proceedings arising in the normal course of business are currently in progress
and Alagasco has accrued a provision for estimated costs.

LEASE OBLIGATIONS: Total payments related to leases included as operating
expense were $2,280,000, $2,146,000, and $2,201,000 in 1997, 1996 and 1995,
respectively. Minimum future rental payments (in thousands) required after 1997
under leases with initial or remaining noncancelable lease terms in excess of
one year are as follows:

<TABLE>
<CAPTION>
- -------------------------------------------------------------------------------
        1998         1999       2000      2001     2002    2003 and thereafter
- -------------------------------------------------------------------------------
<S>                  <C>        <C>       <C>      <C>     <C>
       $2,329        $647       $305      $249     $71            $25
- -------------------------------------------------------------------------------
</TABLE>



8. SUPPLEMENTAL CASH FLOW INFORMATION
- --------------------------------------------------------------------------------

Supplemental information concerning cash flow activities is as follows:

<TABLE>
<CAPTION>
- -------------------------------------------------------------------------------
For the years ended September 30, (in thousands)       1997      1996    1995
- -------------------------------------------------------------------------------
<S>                                                   <C>      <C>     <C>    
Interest paid, net of amount capitalized              $10,192  $9,216  $11,166
Income taxes paid                                     $13,228  $5,932  $10,920
Noncash investing activities:
  Capitalized depreciation                            $   168  $  166  $   166
  Allowance for funds used during construction        $   490  $  972  $ 1,054
Noncash financing activities (debt issuance costs)    $    --  $  171  $   340
- -------------------------------------------------------------------------------
</TABLE>

9. FINANCIAL INSTRUMENTS AND RISK MANAGEMENT
- -------------------------------------------------------------------------------
FINANCIAL INSTRUMENTS: The fair value of cash and cash equivalents, trade
receivables (net of allowance), and short-term debt approximates fair value due
to the short maturity of the instruments. The fair value of fixed-rate long-term
debt with a carrying value of $125,000,000, would be $126,886,000 at September
30, 1997. The fair value was based on the market value of debt with similar
maturities and with interest rates currently trading in the marketplace.

Alagasco has entered into an agreement with a financial institution whereby it
can sell on an ongoing basis, with recourse, certain installment receivables
related to its merchandising program up to a maximum of $20 million. During
1997, 1996 and 1995, Alagasco sold $7,926,000, $8,831,000 and $8,454,000,
respectively, of installment receivables. At September 30, 1997 and 1996, the
balance of these installment receivables was $17,160,000 and

                                       33

<PAGE>   35



$16,964,000, respectively. Receivables sold under this agreement are considered
financial instruments with off-balance sheet risk. Alagasco's exposure to credit
loss in the event of non-performance by customers is represented by the balance
of installment receivables.

CONCENTRATION OF CREDIT RISK: Natural gas distribution operating revenues and
related accounts receivable are generated from state-regulated utility natural
gas sales and transportation to more than 465,000 residential, commercial and
industrial customers located in central and north Alabama. A change in economic
conditions may affect the ability of customers to meet their obligations;
however, Alagasco believes that its provision for possible losses on
uncollectible accounts receivable is adequate for its credit loss exposure.

10. RECENT PRONOUNCEMENTS OF THE FASB
- --------------------------------------------------------------------------------

In fiscal 1997, the Company adopted SFAS No. 123, Accounting for Stock-Based
Compensation, which establishes a fair value-based method of accounting for
employee stock options. The Statement allows companies to continue to follow the
accounting treatment prescribed by APB Opinion 25 with proper disclosure. The
Company has adopted the disclosure-only provisions of SFAS 123.

In 1997, the Company adopted SFAS No. 125, Accounting for Transfers and
Servicing of Financial Assets and Extinguishment of Liabilities, which provides
accounting and reporting standards for such transactions. The adoption did not
have a material impact on the consolidated financial statements.

In February 1997, the FASB issued SFAS No. 128, Earnings Per Share, which
specifies computation, presentation, and disclosure requirements for EPS, and
SFAS No. 129, Disclosures of Information about Capital Structure, which
establishes standards for disclosing information about an entity's capital
structure. The Company is required to adopt these Statements in its 1998 fiscal
year. In June 1997, the FASB issued SFAS No. 130, Reporting Comprehensive
Income, which requires the reporting and display of comprehensive income and its
components in an entity's financial statements, and SFAS No. 131, Disclosures
about Segments of an Enterprise and Related Information, which specifies revised
guidelines for determining an entity's operating segments and the type and level
of financial information to be required. The Company is required to adopt these
Statements in fiscal year 1999. The impact of these pronouncements on the
Company is currently being evaluated.

11. SUMMARIZED QUARTERLY FINANCIAL DATA (UNAUDITED)
- --------------------------------------------------------------------------------

The following data summarize quarterly operating results. Alagasco's business is
seasonal in character and strongly influenced by weather conditions.

<TABLE>
<CAPTION>
- -------------------------------------------------------------------------------------------------------------------

Fiscal year 1997 quarters (in thousands)                          First         Second        Third        Fourth
- -------------------------------------------------------------------------------------------------------------------
<S>                                                              <C>           <C>           <C>           <C>
Operating revenues                                               $ 83,305      $160,152      $ 70,147      $ 49,380
Operating income (loss)                                          $  4,055      $ 22,963      $  4,282      $ (2,626)
Net income (loss) available for common                           $  1,807      $ 20,163      $  1,701      $ (5,101)
- -------------------------------------------------------------------------------------------------------------------
Fiscal year 1996 quarters (in thousands)
- -------------------------------------------------------------------------------------------------------------------
Operating revenues                                               $ 73,185      $162,143      $ 77,225      $ 44,699
Operating income (loss)                                          $  4,124      $ 21,271      $  3,638      $ (2,810)
Net income (loss) available for common                           $  1,986      $ 18,646      $  1,380      $ (5,051)
- -------------------------------------------------------------------------------------------------------------------
</TABLE>

12. TRANSACTIONS WITH RELATED PARTIES
- --------------------------------------------------------------------------------


Alagasco purchased natural gas from affiliates amounting to $5,165,000,
$5,097,000, and $4,644,000, in 1997, 1996, and 1995, respectively. These amounts
are included in gas purchased for resale. Alagasco had net payables to
affiliates of $4,984,000 at September 30, 1997, and net receivables from
affiliates of $9,070,000 at September 30, 1996.




                                       34

<PAGE>   36



REPORT OF INDEPENDENT CERTIFIED PUBLIC ACCOUNTANTS

TO THE BOARD OF DIRECTORS OF ENERGEN CORPORATION:

Our report on the consolidated financial statements of Energen Corporation and
subsidiaries has been incorporated by reference in this Form 10-K from page 50
of the 1997 Annual Report to Stockholders of Energen Corporation and
subsidiaries. In connection with our audits of such financial statements, we
have also audited the related financial statement schedule listed in the index
on page 16 and 17 of this Form 10-K.

In our opinion, the financial statement schedule referred to above, when
considered in relation to the basic financial statements taken as a whole,
present fairly, in all material respects the information required to be included
therein.



Coopers & Lybrand L.L.P.
Birmingham, Alabama
October 23, 1997
















                                       35

<PAGE>   37



SCHEDULE II -- VALUATION AND QUALIFYING ACCOUNTS
ENERGEN CORPORATION AND SUBSIDIARIES

================================================================================

<TABLE>
<CAPTION>
YEARS ENDED SEPTEMBER 30, (IN THOUSANDS)        1997         1996        1995
================================================================================
ALLOWANCE FOR DOUBTFUL ACCOUNTS
<S>                                            <C>         <C>         <C>    
Balance at beginning of year                   $ 3,002     $ 2,533     $ 2,037
- --------------------------------------------------------------------------------
     Additions:
       Charged to income                         1,837       2,361       2,431
       Recoveries and adjustments                 (186)       (187)         67
- --------------------------------------------------------------------------------

                                                 1,651       2,174       2,498
- --------------------------------------------------------------------------------

    Less uncollectible accounts written off      1,468       1,705       2,002
- --------------------------------------------------------------------------------

BALANCE AT END OF YEAR                         $ 3,185     $ 3,002     $ 2,533
================================================================================
</TABLE>




































                                       36

<PAGE>   38



SCHEDULE II -- VALUATION AND QUALIFYING ACCOUNTS
ALABAMA GAS CORPORATION

================================================================================

<TABLE>
<CAPTION>
YEARS ENDED SEPTEMBER 30, (IN THOUSANDS)         1997        1996        1995
================================================================================
<S>                                            <C>         <C>         <C>    
ALLOWANCE FOR DOUBTFUL ACCOUNTS
Balance at beginning of year                   $ 2,985     $ 2,000     $ 2,000
- --------------------------------------------------------------------------------

     Additions:
       Charged to income                         1,575       2,349       1,935
       Recoveries and adjustments                 (186)       (187)         67
- --------------------------------------------------------------------------------

                                                 1,389       2,162       2,002
- --------------------------------------------------------------------------------

    Less uncollectible accounts written off      1,218       1,177       2,002
- --------------------------------------------------------------------------------

BALANCE AT END OF YEAR                         $ 3,156     $ 2,985     $ 2,000
================================================================================
</TABLE>













                                       37


<PAGE>   1
                                                                EXHIBIT 10(f)

                              ENERGEN CORPORATION
                     1992 LONG-RANGE PERFORMANCE SHARE PLAN
                     (AS AMENDED EFFECTIVE APRIL 25, 1997)

1.       PURPOSE

The purpose of the Energen Corporation 1992 Long-Range Performance Share Plan
(the "Plan") is to further the long-term growth in profitability of the
Corporation by offering long-term incentives in addition to current
compensation to those key executives who will be largely responsible for such
growth.

2.       DEFINITIONS

         (a)      "Award" means Performance Shares awarded to a Participant
pursuant to the terms of the Plan.

         (b)      "Award Period" means the 4-year period (Energen fiscal years)
commencing with the first day of the fiscal year in which the applicable Award
is granted, except as otherwise determined by the Committee at the time of
grant and subject to the other provisions of this Plan.

         (c)      "Board of Directors" means the Board of Directors of Energen.

         (d)      "Cause" Termination of employment by the Corporation for
"Cause" shall mean termination based on any of the following:

                  (1) The willful and continued failure by a Participant to
substantially perform such participant's duties with the Corporation (other
than any such failure resulting from such participant's incapacity due to
physical or mental illness) after a written demand for substantial performance
is delivered to the Participant specifically identifying the manner in which
such Participant has not substantially performed such Participant's duties;

                  (2)      The engaging by a Participant in willful, reckless
or grossly negligent misconduct which is demonstrably injurious to the
Corporation monetarily or otherwise; or

                  (3)      The conviction of a Participant of a felony.

         (e)      "Change in Control" means:

                                       1


<PAGE>   2



                  (1)      The acquisition by any person, entity or "group",
within the meaning of Section 13(d)(3) or 14(d)(2) of the Exchange Act
(excluding for this purpose, any employee benefit plan of Energen or any of its
Subsidiaries which acquires beneficial ownership of voting securities of
Energen), of beneficial ownership (within the meaning of Rule 13d-3 under the
Exchange Act) of 25% or more of either the then outstanding shares of Common
Stock or the combined voting power of Energen's then outstanding voting
securities, in one transaction or a series of transactions;

                  (2)      Individuals who, as of November 27, 1991, constitute
the Board of Directors (the "Continuing Directors") cease for any reason to
constitute at least a majority of the Board of Directors, provided that any
person becoming a director of Energen subsequent to November 27, 1991, whose
election, or nomination for election by Energen's stockholders, was approved by
a vote of at least a majority of the Continuing Directors (other than an
election or nomination of an individual whose initial assumption of office is
in connection with an actual or threatened solicitation with respect to the
election or removal of directors of Energen, as such terms are used in Rule
14a-11 of Regulation 14A under the Exchange Act) shall be, for purposes of the
Plan, considered as though such person were a Continuing Director;

                  (3)      (i) The occurrence of a merger, consolidation or
reorganization of Energen in which, as a consequence of the transaction, either
the Continuing Directors do not constitute a majority of the directors of the
continuing or surviving corporation or any person, entity or "group", within
the meaning of Section 13(d)(3) or 14(d)(2) of the Exchange Act, controls 25%
or more of the combined voting power of the continuing or surviving
corporation; (ii) the occurrence of any sale, lease or other transfer, in one
transaction or a series of transactions, of all or substantially all of the
assets of Energen; or (iii) the adoption by Energen of a plan for its
liquidation or dissolution.

         (f)      "Chief Executive Officer" means the chief executive officer
of Energen.

         (g)      "Committee" means the Officers Review Committee of the Board
of Directors or such other committee of two or more directors as may be
determined by the Board of Directors, provided that in all events each member
of the Committee shall be a "disinterested person" within the meaning of Rule
16b-3(c)(2) under the Exchange Act.

         (h)      "Common Stock" means the Common Stock, par value $0.01 per
share, of Energen as such stock may be reclassified, converted or exchanged by
reorganization, merger or otherwise.

         (i)      "Corporation" means Energen and its Subsidiaries.

         (j)      "Employee" means any person (including any officer or
director) employed by the Corporation on a full-time salaried basis.

         (k)      "Energen" means Energen Corporation, an Alabama Corporation.

         (l)      "Exchange Act" means the Securities Exchange Act of 1934.

         (m)      "Fair Market Value" means the average of the daily closing
prices for a share of stock for the 20 trading days ending on the fifth
business day prior to the date of payment of Performance

                                       2


<PAGE>   3



Shares for an Award Period or an Interim Period, as the case may be, on the
Composite Tape for the New York Stock Exchange -- Listed Stocks, or, if the
stock is not listed on such Exchange, on the principal United States securities
exchange registered under the Securities Exchange Act of 1934, as amended (the
"Exchange Act"), on which the stock is listed, or, if the stock is not listed
on any such Exchange, the average of the daily closing bid quotations with
respect to a share of the stock for such 20 trading days on the National
Association of Securities Dealers, Inc., Automated Quotations System or any
system then in use, or, if no such quotations are available, the fair market
value of a share of stock as determined by a majority of the Board of
Directors; provided, however that if a Change in Control shall have occurred,
then such determination shall be made by a majority of the Continuing
Directors.

         (n)      "Interim Period" means a 1, 2 or 3 year period within an
Award Period for which the Committee determines that there shall be Interim
Periods.

         (o)      "Officer" means any Employee of the Corporation who is an
"officer" of the Corporation within the meaning of Rule 16a-l(f) under the
Exchange Act as well as any Employee who has an officer title with the
Corporation.

         (p)      "Participant" means an Employee who is selected by the
Committee to receive an Award under the Plan.

         (q)      "Performance Share" means the equivalent of one share of
Common Stock.

         (r)      "Qualified Termination" means termination of a Participant's
employment with the Corporation which is:

                  (i)      An involuntary termination by the Corporation other
                           than for Cause;

                  (ii)     Expressly agreed in writing by the Participant and
                           the Corporation to constitute a Qualified
                           Termination for purposes of this Plan;

                  (iii)    A result of the death, Disability or Retirement of
                           the Participant;

                  (iv)     A voluntary termination by the Participant for Good
                           Reason. The term "Good Reason" means with respect to
                           an Award and a Participant, the occurrence
                           subsequent to the grant of such Award of (A) a
                           reduction in the Participant's aggregate rate of
                           monthly base pay from the Corporation or (B) the
                           termination or materially adverse modification of
                           the Energen Annual Incentive Compensation Plan
                           without substitution of new short-term incentives
                           providing comparable compensation opportunities for
                           the Participant.

         (s)      "Subsidiary" means any corporation, the majority of the
outstanding voting stock of which is owned, directly or indirectly, by Energen.

                                       3


<PAGE>   4



3.       ADMINISTRATION OF THE PLAN

The Plan shall be administered by the Committee. No member of the Committee
shall be eligible to participate in the Plan while serving as a member of the
Committee. Subject to the provisions of the Plan, the Committee shall have the
exclusive authority to select the Employees who are to participate in the Plan,
to determine the Award to be made to each Employee selected to participate in
the Plan, and to determine the conditions subject to which Awards will become
payable under the Plan; provided, however, that, subject to the provisions of
Section 5(a) hereof, the Committee may delegate to the Chief Executive Officer
the authority to select and make Awards to certain Employees.

The Committee shall have full power to administer and interpret the Plan and to
adopt such rules and regulations consistent with the terms of the Plan as the
Committee deems necessary or advisable in order to carry out the provisions of
the Plan. Except as otherwise provided in the Plan, the Committee's
interpretation and construction of the Plan and of any conditions applicable to
Performance Share Awards shall be conclusive and binding on all persons,
including the Corporation and all Participants.

The Plan shall be unfunded. Benefits under the Plan shall be paid from the
general assets of the Corporation.

4.       PARTICIPATION

Subject to the provisions of Section 5(a) hereof, Participants in the Plan
shall be selected by the Committee or the Chief Executive Officer from those
Employees of the Corporation, who, in the estimation of the Committee or the
Chief Executive Officer, have an opportunity to influence the long-term
profitability of the Corporation.

5.       PERFORMANCE SHARE AWARDS

                  (a)      The Committee, or the Chief Executive Officer upon
delegation of authority by the Committee, may from time to time select
employees to receive Awards under the Plan. An Employee may be granted more
than one Award under the Plan. In its discretion at the time of grant, the
Committee may determine that an Interim Period or Interim Periods should be
established for payment with respect to Awards. Whenever Interim Periods are
established, the terms and conditions with respect to payment after the end of
such Interim Period shall be those set by the Committee. The Committee shall
make all Awards to Officers. The Committee may, in its discretion, authorize a
total number of Performance Shares to be awarded to non-Officer Employees and
delegate to the Chief Executive Officer the authority to select such Employees,
to determine the number of Performance Shares to be awarded to such Employees
and to establish Interim Periods with respect to Awards to such Employees. The
Chief Executive Officer shall promptly make a written report to the Committee
setting forth the name and positions of the Employees receiving such Awards and
the number of Performance Shares awarded to each such employee.

                                       4


<PAGE>   5



                  (b)      An Award shall not entitle a Participant to receive
any dividends or dividend equivalents on Performance Shares; no Participant
shall be entitled to exercise any voting or other rights of a stockholder with
respect to any Award under the Plan; and no Participant shall have any interest
in or rights to receive any shares of Common Stock prior to the time when the
Committee determines the form of payment of Performance Shares pursuant to
Section 6.

                  (c)      Payment of an Award to any Participant shall be made
in accordance with Section 6 and shall be subject to such conditions for
payment as the Committee may prescribe at the time the Award is made.

                  (d)      Each Award shall be made in writing and shall set
forth the terms and conditions set by the Committee for payment of such Award.

6.       PAYMENT OF PERFORMANCE SHARE AWARDS

Each Participant granted an Award shall be entitled to payment on account
thereof as of the close of the Award Period applicable to such Award, but only
if the Committee has determined that the conditions for payment of the Award
set by the Committee have been satisfied. Participants granted Awards with
Interim Periods shall be entitled to partial payment on account thereof as of
the close of the Interim Period, but only if the Committee has determined that
the conditions for partial payment of the Award set by the Committee have been
satisfied. Performance Shares paid to a Participant for an Interim Period need
not be repaid to the Corporation, notwithstanding that, based on the conditions
set for payment at the end of the Award Period, such Participant would not have
been entitled to payment of any portion of such Award. Any Performance Shares
paid to a Participant for the Interim Period during an Award Period shall be
deducted from the Performance Shares to which such Participant is entitled at
the end of the Award Period.

At the time it determines whether the conditions for payment have been
satisfied, the Committee, in its discretion, shall determine whether the Awards
will be paid all in cash, or in some combination of cash and shares of Common
Stock, except and provided that the Committee must pay in cash an amount equal
to the federal, state and other taxes which the Corporation is required to
withhold, and further provided that payment in shares of Common Stock shall be
subject to the aggregate share limitation set forth in Section 11. The
Corporation shall deduct from the cash portion of all Awards any federal, state
and other taxes required by law to be withheld with respect to such Awards.
Payment of Awards shall be made by the Corporation as promptly as possible
after the determination by the Committee that payment has been earned and upon
a date fixed by the Committee to permit calculation of Fair Market Value of the
Common Stock. The portion of the Award paid in Common Stock shall be equal to
the number of Performance Shares being paid in Common Stock, and the balance
shall be an amount of cash equal to the Fair Market Value of the remaining
Performance Shares to be paid.

Notwithstanding the other provisions of this Plan, a Participant may elect
pursuant to the Energen Corporation 1997 Deferred Compensation Plan to defer
payment of an Award and upon such deferral shall have no further right with
respect to such deferred Award other than as provided under said Deferred
Compensation Plan. In the event of such an election, any Awards or portions of
Awards

                                       5


<PAGE>   6



which become payable to the Participant and which are subject to such deferral
election, may at the discretion of the Company be paid to the Trustee under
such Deferred Compensation Plan in the form of Common Stock and/or cash as
determined from time to time by the Company, which Common Stock shall be
registered in the name of the Trustee or such other person as the Trustee may
direct. Regardless of whether such deferred Common Stock or cash is delivered
to the Trustee, such deferred Awards shall count against the maximum number of
Performance Shares awardable under the Plan pursuant to Section 11. Furthermore
any such shares of Common Stock delivered to the Trustee shall count against
the maximum number of shares of Common Stock which may be issued under the Plan
pursuant to Section 11.

7.       TERMINATION OF EMPLOYMENT

Except in the case of a Qualified Termination if, prior to the close of the
Award Period with respect to an Award, a Participant's employment terminates,
then any unpaid portion of such Participant's Award shall be forfeited. In the
case of a Qualified Termination, the Participant shall remain entitled to
payout of any outstanding Awards at the end of the applicable Award Period in
accordance with the terms of this Plan including without limitation applicable
performance conditions.

8.       CONSULTING, NON-COMPETE AND CONFIDENTIALITY

A Participant's entitlement, if any, to payout of Awards subsequent to
termination of employment shall continue so long as the Participant is in
compliance with the following requirements. Failure

to comply shall result in forfeiture of all then outstanding Awards.

                  (a)      Consulting Services. For a period of three years
                           following the termination of the Participant's
                           employment with the Corporation ("Date of
                           Termination"), Participant will fully assist and
                           cooperate with Corporation and its representatives
                           (including outside auditors, counsel and
                           consultants) with respect to any matters with which
                           the Participant was involved during the course of
                           employment with Corporation, including being
                           available upon reasonable notice for interviews,
                           consultation, and litigation preparation. Except as
                           otherwise agreed by Participant, Participant's
                           obligation under this Section 8(a) shall not exceed
                           80 hours during the first year and 20 hours during
                           each of the following two years. Such services shall
                           be provided upon request of the Corporation but
                           scheduled to accommodate Participant's reasonable
                           scheduling requirements. Participant shall receive
                           no additional fee for such services but shall be
                           reimbursed all reasonable out-of-pocket expenses.

                  (b)      Non-Compete. For a period of twelve months following
                           the Date of Termination, the Participant shall not
                           Compete, (as defined below) or assist others in
                           Competing with the Corporation. For purposes of this
                           Agreement, "Compete" means (i) solicit in
                           competition with Alabama

                                       6


<PAGE>   7



                           Gas Corporation ("Alagasco") any person or entity
                           which was a customer of Alagasco at the Date of
                           Termination; (ii) offer to acquire any local gas
                           distribution system in the State of Alabama; or
                           (iii) offer to acquire any coalbed methane interest
                           in the State of Alabama. Employment by, or an
                           investment of less than one percent of equity
                           capital in, a person or entity which Competes with
                           the Corporation does not constitute Competition by
                           Participant so long as Participant does not directly
                           participate in, assist or advise with respect to
                           such Competition.

                  (c)      Confidentiality. Participant agrees that at all
                           times following the Date of Termination, Participant
                           will not, without the prior written consent of
                           Energen, disclose to any person, firm or corporation
                           any confidential information of Corporation which is
                           now known to Participant or which hereafter may
                           become known to Participant as a result of
                           Participant's employment or association with
                           Corporation, unless such disclosure is required
                           under the terms of a valid and effective subpoena or
                           order issued by a court or governmental body;
                           provided, however, that the foregoing shall not
                           apply to confidential information which becomes
                           publicly disseminated by means other than a breach
                           of this Agreement.


9.       Deleted

10.      Deleted

11.      LIMITATION ON AWARDS

The maximum number of Performance Shares which may be awarded under the Plan
shall not exceed an aggregate of 500,000 (except as adjusted in accordance with
Section 17) and no more than an aggregate of 350,000 shares of Common Stock
(similarly adjusted in accordance with Section 17 shall be issued in payment of
Performance Share Awards, the remainder being payable in cash. Any Performance
Shares awarded under the Plan which are not payable upon expiration or
termination of the applicable Award Period, for whatever reason, shall
thereupon become available again for award under the Plan.

12.      TERM OF THE PLAN

The Plan shall be effective October 1, 1991, subject to the approval of the
Plan by the stockholders of Energen at the Annual Meeting of Stockholders to be
held January 22, 1992. Awards may be granted under the Plan by the Committee
prior but subject to such stockholder approval. The Board of Directors may
terminate the Plan at any time. If not sooner terminated, the Plan terminates
on the date on which all of the Performance Shares subject to award under the
Plan have been paid, but no

                                       7


<PAGE>   8



grant of Awards may be made after September 30, 2001. No such termination shall
adversely affect any right or obligation with respect to an Award theretofore
made.

13.      CANCELLATION OF PERFORMANCE SHARES

With the written consent of a Participant holding Performance Shares granted to
such Participant under the Plan, the Committee may cancel such Performance
Shares. In the event of any such cancellation, all rights of the former holder
of such cancelled Performance Shares in respect of such cancelled Performance
Shares under the Plan or otherwise shall terminate.

14.      NO ASSIGNMENT OF INTEREST

The interest of any person in the Plan shall not be assignable, either by
voluntary assignment or by operation of law, and any assignment of such
interest, whether voluntary or by operation of law, shall render the Award
void. Amounts payable under the Plan shall be transferable only by will or by
the laws of descent and distribution.

15.      EMPLOYMENT RIGHTS

An Award made under the Plan shall not confer any right on the Participant to
continue in the employ of the Corporation or limit in any way the right of the
Corporation to terminate such Participant's employment at any time.

16.      EXPENSES

The expenses of administering the Plan shall be borne by the Corporation.

17.      DILUTION AND OTHER ADJUSTMENTS

If Energen shall at any time issue any shares of Common Stock (i) in
subdivision of outstanding shares of Common Stock, by reclassification or
otherwise, or (ii) for a stock dividend, the number of Performance Shares which
previously have been awarded to Participants and which may be awarded under the
Plan shall be increased proportionately; and in like manner, in case of any
combination of shares of Common Stock, by reclassification or otherwise, the
number of Performance Shares which previously have been awarded to Participants
and which may be awarded under the Plan shall be reduced proportionately. If
Energen shall at any time declare and pay an extraordinary dividend in cash or
property (other than a stock dividend with respect to the Common Stock referred
to in clause (ii), above), the number of Performance Shares which previously
have been awarded to Participants shall be increased in such manner as the
Committee shall determine

                                       8


<PAGE>   9


to be fair under the circumstances of such extraordinary dividend; provided,
however, that if a Change in Control shall have occurred, such determination
shall be made by a majority of the Continuing Directors.

18.      CHANGE IN CONTROL

The other provisions of the Plan notwithstanding, (i) the Committee is
authorized to specify such procedures as it may deem appropriate in connection
with a Change in Control of Energen, including without limitation acceleration
of payment of part or all of outstanding Awards, the establishment and funding
of a trust to be held for the payment of Awards following such Change in
Control, and the modification of performance conditions applicable to
outstanding Awards and (ii) all Award payments made subsequent to a Change in
Control shall be paid in cash.

19.      AMENDMENT OF THE PLAN

The Board of Directors may amend or suspend the Plan at any time. No such
amendment or suspension shall adversely affect any right or obligation with
respect to an Award theretofore made, including, without limitation, the right
to receive payment of Awards in accordance with Section 18 and procedures
adopted thereunder (subject, however, to the right of the Committee to amend or
suspend such Section 18 procedures prior to the occurrence of a Change in
Control).



                  As adopted November 27, 1991 by the Energen Corporation Board
of Directors with approval January 22, 1992 by the shareholders and
subsequently (i) amended September 25, 1996 by the Board, with approval January
26, 1997 by the shareholders, and (ii) amended April 25, 1997 by the Board.

                                       9



<PAGE>   1
                                                                      EXHIBIT 13


MANAGEMENT'S DISCUSSION AND ANALYSIS OF RESULTS
OF OPERATIONS AND FINANCIAL CONDITION

RESULTS OF OPERATIONS
CONSOLIDATED NET INCOME

Energen Corporation's net income for the 1997 fiscal year totaled $29 million,
or $2.31 per share, a significant increase from 1996 earnings of $21.5 million,
or $1.95 per share. Continued financial and operating strength at Energen's
utility, Alabama Gas Corporation (Alagasco), combined with the results of
Energen's diversified growth strategy at Taurus Exploration Inc. (Taurus),
Energen's oil and gas subsidiary, to produce an 18.5 percent increase in
earnings per share. For 1995, Energen reported earnings of $19.3 million, or
$1.77 per share.

1997 VS 1996: Alagasco's earnings were $18.6 million, a 9.5 percent increase
over prior-year earnings of $17 million, and represented record earnings for a
seventh consecutive year. This increase in net income reflects Alagasco's
ability to earn within its allowed range of return on an increased level of
equity representing investment in its utility plant. Alagasco achieved a return
on equity (ROE) of 13.5 percent.

Taurus earned $10 million in 1997, more than doubling prior year earnings of
$4.5 million. The main reasons for the significant increase were a 130 percent
increase in oil and gas production volumes to 37 billion cubic feet equivalent
(Bcfe) and a $3.8 million increase in nonconventional fuels tax credits
primarily resulting from production from coalbed methane property acquisitions
in 1996 and 1997. Partially offsetting these gains were increased
production-related expenses, increased interest expense, and a $1.3 million
after-tax write down of certain offshore oil and gas properties in anticipation
of their sale.

1996 VS 1995: Alagasco's 1996 net income of $17 million increased 8 percent
over 1995 net income of $15.7 million primarily due to the utility earning
within its allowed range of return on an increased level of equity representing
investment in its utility plant. Fiscal 1995 earnings included a one-time
after-tax charge of $503,000 resulting from a voluntary early retirement
program. Taurus's net income increased $1 million to $4.5 million in 1996 on
the strength of increased oil and gas production, higher commodity sales prices
and gains on the sale of reserves; negatively influencing Taurus's earnings
were increases in production-related expenses, primarily depreciation,
depletion and amortization (DD&A), as well as increased interest and
exploration expenses.

OPERATING INCOME
Consolidated operating income in 1997, 1996, and 1995 totaled $52 million,
$38.8 million, and $32 million, respectively. Operating income grew
significantly in 1997, reflecting another successful year under Energen's
diversified growth strategy. Taurus again showed significant improvement over
the prior year, and growth in Alagasco's operating income was consistent with
its increased level of equity upon which it is allowed to earn a return.
Operating income in 1996 also benefited from the implementation of Energen's
growth strategy at Taurus along with the recognition of a gain on the sale of
reserves.

ALAGASCO: Alagasco generates revenues through the sale and transportation of
natural gas. Shifts between transportation and sales gas can cause variations
in natural gas revenues since the transportation rate does not contain an
amount representing the cost of gas. Alagasco's rate structure allows similar
margins on transported and sales gas; therefore, operating income is not
adversely affected. Weather also can cause variations in revenues, but
operating margins remain unaffected due to a real-time temperature adjustment
which allows Alagasco to adjust customer bills monthly to reflect changes in
usage due to departures from normal weather.

Alagasco's gross natural gas sales revenues totaled $329.9 million, $326.8
million, and $265.5 million, in 1997, 1996, and 1995, respectively. In the
current year, sales revenues remained relatively stable as higher commodity
cost of gas, which is passed through to customers in rates, was largely offset
by the impact of warmer weather on throughput. In 1996 significantly colder
weather and higher commodity gas costs combined to generate substantially
higher revenues than in the previous year; margins associated with the colder

                                                                             21

<PAGE>   2




weather were removed via the real-time temperature adjustment to customer bills.

Residential sales volumes decreased 19 percent in the current year primarily
due to weather in Alagasco's service territory that was 12 percent warmer than
normal and 22 percent warmer than that of the prior year. Sales and
transportation volumes to commercial and industrial customers totaled 78.2 Bcf
in 1997 and 76.5 Bcf in 1996. While small commercial and industrial customers,
more sensitive to weather, experienced volume decreases similar to residential
customers, Alagasco increased throughput to several large transportation
customers. In 1996, Alagasco's coldest winter in 18 years significantly
increased residential and small commercial and industrial volumes.

Cost of gas remained relatively stable in 1997 as higher commodity gas cost was
offset by a weather-related decrease in purchased volumes. In the prior year,
colder weather had the opposite impact on purchased volumes and, coupled with
higher commodity cost, caused a 36 percent increase in cost of gas.

<TABLE>
<CAPTION>
- -------------------------------------------------------------------------------------------------------------------------
Years ended September 30, (dollars in thousands)                            1997               1996                1995
- -------------------------------------------------------------------------------------------------------------------------
<S>                                                                     <C>               <C>                 <C>
Gross natural gas sales revenues.....................................   $   329,904       $     326,844       $  265,477
Cost of natural gas..................................................      (177,837)           (181,400)        (133,556)
Revenue taxes........................................................       (19,676)            (20,055)         (16,051)
- ------------------------------------------------------------------------------------------------------------------------
Net natural gas sales margin.........................................       132,391             125,389          115,870
Net natural gas transportation  margin...............................        33,080              30,408           30,490
- ------------------------------------------------------------------------------------------------------------------------
Net natural gas sales and transportation  margin.....................   $   165,471        $    155,797        $ 146,360
- ------------------------------------------------------------------------------------------------------------------------
Natural gas sales volumes (MMcf)
   Residential.......................................................        28,357              34,963           27,489
   Commercial and industrial-small...................................        12,554              15,002           12,288
   Commercial and industrial-large...................................            --                  --               29
- ------------------------------------------------------------------------------------------------------------------------
Total natural gas sales volumes......................................        40,911              49,965           39,806
Natural gas transportation volumes (MMcf)............................        65,622              61,458           61,640
- ------------------------------------------------------------------------------------------------------------------------
Total deliveries (MMcf)..............................................       106,533             111,423          101,446
- ------------------------------------------------------------------------------------------------------------------------
</TABLE>

Operations and maintenance (O&M) expense at the utility increased 4 percent in
1997 primarily due to higher labor and related costs and increased marketing
expense; partially offsetting these amounts was a decrease in bad debt expense
created when the utility increased its provision for doubtful accounts in the
prior year to reflect increased exposure from higher commodity gas costs in
accounts receivable. In 1996, distribution expense, which includes labor and
maintenance costs, was higher due to colder-than-normal weather. In addition,
while marketing and bad debt expenses were higher, they were offset by the
inclusion in 1995 of a one-time charge for an early retirement option. In both
1997 and 1996, the increase in O&M on a per customer basis fell within the
inflation-based cap established by the Alabama Public Service Commission (APSC)
as part of the utility's rate-setting mechanism.

22


<PAGE>   3



Consistent with growth in the utility's depreciable base, depreciation expense
rose 10 percent in both 1997 and 1996. Alagasco's expense for taxes other than
income primarily reflects various state and local business taxes as well as
payroll-related taxes; state and local business taxes generally are based on
gross receipts and fluctuate accordingly.

As discussed more fully in Note 2 to the Consolidated Financial Statements,
Alagasco is subject to regulation by the APSC. On October 7, 1996, the APSC
issued an order to extend the Company's rate-setting mechanism through January
1, 2002. Under the terms of that extension, RSE will continue after January 1,
2002, unless, after notice to the Company and a hearing, the Commission votes
to either modify or discontinue its operation.

TAURUS: During 1997, Taurus continued its aggressive growth strategy by
acquiring producing oil and gas properties with varying degrees of development
potential. In the second quarter of 1997, Taurus acquired approximately 319
Bcfe of oil and gas reserves in the San Juan Basin for $77 million and plans to
spend an additional $8 million over the next several years to substantially
develop these long-lived reserves. In the third quarter, Taurus spent $8.3
million to purchase approximately 10.2 Bcfe of proved reserves in southwest
Mississippi from Griffin and Griffin Oil Company. Approximately 85 percent of
the estimated proved reserves are gas and almost 60 percent are developed and
producing. Taurus plans to spend an additional $1.2 million to develop the
remaining 4.5 Bcfe of behind-pipe and proved undeveloped reserves. In several
smaller transactions, Taurus acquired 4.8 Bcfe of predominantly natural gas
reserves in Texas and Louisiana for $5.2 million. Approximately 40 percent of
the proved reserves are developed and producing, and the Company expects to
spend an additional $3.2 million to fully develop the remaining behind-pipe and
proved undeveloped reserves. Also in the third quarter, Taurus invested $16
million for a 9 percent interest in a joint venture with Sonat Exploration and
United Meridian Corporation for future exploration of the Cotton Valley
Pinnacle Reef trend. In August, the Company purchased Amoco Corporation's Black
Warrior Basin coalbed methane properties for $72 million; these properties
included over 260 producing wells and estimated net proved reserves of 107 Bcf.
Substantially all of the reserves are classified as proved producing. In
addition, Taurus spent $9.3 million in July 1997 to purchase approximately 10.4
Bcfe of domestic oil and natural gas reserves located in Texas and the Rocky
Mountains from United Meridian Corporation.

Largely as a result of these acquisitions, revenues from oil and gas production
activities continued to grow significantly. Total production volumes rose 130
percent to 37 Bcfe. Natural gas production, including coalbed methane,
increased 138 percent to 29.3 Bcf. Oil volumes increased 22 percent to 775
MBbl. Taurus also acquired high BTU-content natural gas reserves in the San
Juan Basin which yielded 502 MBbl in natural gas liquids by year-end. Taurus
also benefited from higher realized oil and gas prices during 1997. Gas sales
prices rose 4 percent to $2.05 per Mcf and oil sales prices increased 11
percent to $18.08 per barrel. Natural gas liquids sold for $11.45 per barrel.
During 1996, revenues from oil and gas production activities also grew notably.
Total production volumes were 16.1 Bcfe, increasing 60 percent from the prior
year. Gas prices were $1.97 per Mcf, higher by 15 percent, and oil prices were
$16.25 per barrel, up 8 percent.

Coalbed methane operating fees are calculated as a percentage of net proceeds
on certain properties, as defined by the related operating agreements, and vary
with changes in natural gas prices, production volumes, and operating expenses.
Revenues from operating fees were $4.4 million, $3.8 million and $3.4 million
in 1997, 1996 and 1995, respectively. The annual increases resulted primarily
from higher natural gas prices.

Taurus may, in the ordinary course of business, be involved in the sale of both
developed and undeveloped properties. With respect to developed properties,
sales may occur as a result of, but not limited to, disposing of non-strategic
or marginal assets and accepting offers where the buyer gives greater value to
a property than Taurus's technical staff. In 1997 and 1996, Taurus recorded
gains of $1 million and $3.9 million, respectively, on the sale of various
properties. The largest of several property sales occurred in September 1996
when Taurus recorded a $3.2 million gain.

                                                                             23


<PAGE>   4


<TABLE>
<CAPTION>
- -------------------------------------------------------------------------------------------------------------------------
Years ended September 30, (dollars in thousands, except unit price)         1997               1996             1995
- -------------------------------------------------------------------------------------------------------------------------
<S>                                                                     <C>               <C>               <C>
Revenues
   Natural gas production............................................   $   60,228        $    24,262       $    14,748
   Oil production....................................................       19,753             10,313             3,765
   Operating fees....................................................        4,385              3,846             3,374
   Other.............................................................          880              3,769               726
- -------------------------------------------------------------------------------------------------------------------------
Total Revenues.......................................................   $   85,246        $    42,190       $    22,613
- -------------------------------------------------------------------------------------------------------------------------
Production volumes
   Natural gas (MMcf)................................................       29,318             12,308             8,597
   Oil (MBbl)........................................................          775                635               250
   Natural gas liquids (MBbl)........................................          502                 --                --
- -------------------------------------------------------------------------------------------------------------------------
Average unit sales price
   Natural gas (per Mcf).............................................   $     2.05        $      1.97       $      1.72
   Oil (per Bbl).....................................................   $    18.08        $     16.25       $     15.07
   Natural gas liquids (Bbl).........................................   $    11.45                 --                --
- -------------------------------------------------------------------------------------------------------------------------
</TABLE>


Operations expense increased $12.4 million and $4.3 million in 1997 and 1996,
respectively, primarily due to significant growth in production and in
acquisition activity at Taurus. Lease operating expense rose by $10.5 million
in 1997 and $3.4 million in 1996, mainly due to acquisitions. In addition,
exploration expense increased $1.2 million and $2.5 million in 1997 and 1996,
respectively, as a result of Taurus's increased exploratory efforts.

DD&A expense rose $16.5 million in 1997 largely due to significantly higher
production (37 Bcf in 1997 compared to 16.1 Bcf in 1996). The increase was
partially offset by a decrease in the average depletion rate to $0.90 per Mcf
due to the significant addition of long-lived assets. Also during 1997, the
Company adopted Statement of Financial Accounting Standard (SFAS) 121,
Accounting for the Impairment of Long-Lived Assets and for Long-Lived Assets to
Be Disposed Of (see Note 10). Under SFAS 121, Taurus recorded additional DD&A
expense of $2.1 million to write down the value of certain oil and gas
properties that are held for sale. The properties have 9.7 Bcf of proved
undeveloped reserves. During 1996, DD&A expense increased $9.6 million also
largely due to increased production (10.1 Bcf in 1995). In addition, the
average depletion rate of $1.15 per Mcf increased from $0.88 per Mcf in 1995 as
a result of reserve revisions and property write-downs.

Taurus's expense for taxes other than income primarily reflects
production-related taxes. For 1997, 1996, and 1995, Taurus recorded $6.3
million, $1.9 million and $0.8 million, respectively, in severance taxes.

NON-OPERATING ITEMS
CONSOLIDATED: Fiscal 1997 interest expense increased $9 million primarily due
to the financing of Taurus's acquisitions under its growth strategy with both
short-term and long-term debt. The average daily outstanding balance under
short-term credit facilities was $88 million compared to $38 million in the
prior year. Also influencing the current year was interest for a full year on
$40 million in Energen medium-term notes (MTNs) issued in the fourth quarter of
1996 and, to a lesser extent, the issuance of an additional $85 million of MTNs
in July 1997. In addition, Alagasco issued $25 million in MTNs in the fourth
quarter of 1996 to repay short-term debt used to fund customer refunds, gas
storage inventory replacement and facilities upgrade and acquisition. Interest
expense increased $2.2 million in 1996 also due primarily to Taurus's growth
strategy. The average daily outstanding balance under short-term credit
facilities was significantly higher than in 1995 and interest was recorded for
a full year on $50 million of MTNs issued in mid-1995. Also contributing to
increased interest expense was the fourth quarter 1996 issuance of MTNs at both
Energen and Alagasco.

24


<PAGE>   5

The fluctuation in other income over the three-year period is primarily due to
the inclusion in 1996 of the early-call premium associated with the redemption
of debt at Alagasco in 1995.

The Company's effective tax rates in 1997, 1996, and 1995 were lower than
statutory federal tax rates primarily due to the recognition of nonconventional
fuels tax credits and the amortization of investment tax credits. The Company's
effective tax rates are expected to remain lower than statutory federal rates
through December 31, 2002, as tax credits generated each year are expected to
be fully recognized in the financial statements. Income tax expense decreased
in 1997 from 1996 primarily due to the recognition of an additional $3.8
million of nonconventional fuels tax credits. An increase in income tax expense
in 1996 resulted primarily from increased pre-tax income.

Like many companies, Energen is in the process of evaluating its computer
software to determine whether modifications will be required for it to function
properly in the year 2000. Costs associated with evaluation and testing are
being expensed as incurred. The Company has not yet fully determined the total
cost of the project but does not anticipate any material impact on the
consolidated financial statements.

FINANCIAL POSITION AND LIQUIDITY
The Company's net cash from operating activities totaled $66.8 million, $46.7
million, and $60.9 million in 1997, 1996 and 1995, respectively. In the current
year, operating cash flow benefited from increased net income caused by
significantly higher oil and gas production volumes and higher realized oil and
gas prices. Offsetting these amounts was the $17 million payout in January 1997
of supplier refunds to customers. Other working capital items, which are
generally the result of timing of payments, combined to create the remaining
increase. Operating activities contributed $60.9 million in 1995. Colder
weather in 1996 had an impact through its effect on gas supply costs as
reflected in increased accounts receivable and payable and in Alagasco's need
to utilize and replenish its storage gas inventory. The receipt of amounts from
suppliers to be refunded to customers positively affected cash flows in 1996.

During 1997, the Company invested a total of $279.8 million primarily in the
acquisition of oil and gas properties. In the current year, Taurus invested
$239.7 million in total capital expenditures--$193.7 million for property
acquisitions including $16 million to obtain a small working interest in an
exploratory joint venture, $36.4 million for development, and $13.3 million for
exploration ($5.1 million of which was charged to income). Current-year reserve
additions totaled 464 Bcfe. Utility expenditures for the year totaled $43.3
million and represented primarily normal system distribution expansion. Cash
used in investing activities was $152.1 million in 1996 and $67.6 million in
1995. The increase in 1996 was also largely due to the implementation of
Energen's growth strategy. Taurus invested $108 million in proved property
acquisitions with development potential, adding 178 Bcfe of proved developed
and undeveloped oil and gas reserves. Prior-year acquisitions include the $61
million purchase of 105 Bcf of coalbed methane reserves in Alabama. The 1995
acquisitions totaled $16.9 million and added 26.8 Bcfe to proved reserves.
Taurus sold its working interest in reserves associated with the PMC
acquisition venture in 1996 resulting in cash proceeds of $13.1 million.

Financing activities provided a source of $307.2 million in 1997. The Company
issued $85 million of MTNs redeemable July 15, 2002, to July 28, 2027, with
interest rates ranging from 6.6 percent to 7.6 percent. In addition, Energen
issued 1,725,000 shares of common stock in January generating net proceeds of
$49.1 million, and 1,200,000 shares in September generating net proceeds of
$41.1 million. The proceeds from the debt and equity offerings were used to
repay short-term debt incurred mainly to finance Taurus's acquisition and
development strategy. In addition, the Company utilized $45 million in
short-term credit facilities primarily for Taurus's capital expenditures. For
shares tax planning purposes, the Company borrowed $98.6 million to invest in
short-term federal obligations. The Treasuries matured in early October and the
proceeds were used to repay the debt. The cash provided by financing activities
totaled $80 million in 1996. The Company issued $40 million of MTNs and
utilized an additional $26.7 million in short-term credit facilities to finance
Taurus's acquisition strategy in the prior year. Also included were the
proceeds from the issuance of $25 million in Alagasco MTNs used for customer
refunds, gas storage inventory replacement, and facilities upgrade and
acquisition. Cash provided by financing activities in 1995 was $15.9 million
and included the issuance of $50 million in Alagasco MTNs used to refinance
other long-term debt.

                                                                             25


<PAGE>   6




CAPITAL EXPENDITURES
NATURAL GAS DISTRIBUTION: During the last three fiscal years, Alagasco has
invested $129.2 million for capital projects: $105.5 million was spent on
normal expansion replacements and support of its distribution system; $8.2
million was used in connection with the development of a new customer
information system which was completed in April 1996; $5.6 million was used to
improve gas availability; $7.3 million was used to purchase four municipal gas
systems; and $2.7 million was used in connection with the development of a new
payroll/human resource information system.

<TABLE>
<CAPTION>
- -------------------------------------------------------------------------------------------------------------------------
Years ended September 30, (in thousands)                                    1997               1996             1995
- -------------------------------------------------------------------------------------------------------------------------
<S>                                                                     <C>               <C>               <C>
Capital expenditures for:
   Renewals, replacements, system expansion and other................   $   39,779        $    35,064       $    30,611
   Additions to improve gas availability.............................          758              1,799             3,024
   Municipal gas system acquisitions.................................            3              3,305             3,972
   Payroll/human resource information system.........................        2,737                 --                --
   Customer information system.......................................           --              3,007             5,173
- -------------------------------------------------------------------------------------------------------------------------
   Total.............................................................   $   43,277        $    43,175       $    42,780
- -------------------------------------------------------------------------------------------------------------------------
</TABLE>

EXPLORATION AND PRODUCTION: Taurus has spent $403.8 million for capital
projects over the last three fiscal years, $11.3 million of which was charged
to income as exploration expense. Expenditures for property acquisitions were
$321.7 million, exploratory expenditures totaled $26.9 million, and $52.5
million was spent in development activities.

<TABLE>
<CAPTION>
- -------------------------------------------------------------------------------------------------------------------------
Years ended September 30, (in thousands)                                    1997               1996             1995
- -------------------------------------------------------------------------------------------------------------------------
<S>                                                                     <C>               <C>               <C>
Capital and exploration expenditures for:
   Property acquisitions.............................................   $  193,729        $   110,008       $    17,939
   Exploration.......................................................       13,277              9,855             3,794
   Development.......................................................       36,375             10,040             6,044
   Other.............................................................        1,406                583               716
- -------------------------------------------------------------------------------------------------------------------------
       Total.........................................................      244,787            130,486            28,493
Less exploration expenditures charged to income......................        5,069              4,169             2,064
- -------------------------------------------------------------------------------------------------------------------------
Net capital expenditures.............................................   $  239,718        $   126,317       $    26,429
- -------------------------------------------------------------------------------------------------------------------------
</TABLE>


FUTURE CAPITAL RESOURCES AND LIQUIDITY
The Company will continue to implement its diversified growth strategy over the
next three years. That strategy calls for Taurus to invest $500 million to $650
million to acquire and develop producing properties and to participate in
exploration and related development during the three-year period. In fiscal
year 1998, Taurus plans to spend approximately $165 million, including $100
million for property acquisitions. It should be noted that Taurus's continued
ability to invest in property acquisitions will be influenced significantly by
industry trends as the producing property acquisition market has historically
been cyclical. From time to time, Taurus also may be engaged in negotiations to
sell, trade or otherwise dispose of previously acquired property.

To finance Taurus's investment program, the Company will continue to utilize
its available short-term credit facilities to supplement internally generated
cash flow, with long-term debt and equity providing permanent financing. During
1997, Energen has increased its available short-term credit facilities to $203
million to accommodate the Taurus strategy.

26


<PAGE>   7


Utility capital expenditures for normal distribution system renewal and
expansion and support facilities could approximate $60 million in fiscal 1998.
Alagasco also will maintain an investment in storage working gas which is
expected to average approximately $24 million in 1998. The utility anticipates
funding these capital requirements through internally generated capital and the
utilization of short-term credit facilities.

OUTLOOK
NATURAL GAS DISTRIBUTION: The October 1996 extension of the utility's
rate-setting mechanism until January 1, 2002, gives Alagasco the opportunity to
continue earning an allowed return on equity within a range of 13.15 percent to
13.65 percent through fiscal 2002. Over this period, Alagasco's earnings should
grow 3 percent to 5 percent annually as the service territory requires the
investment of additional utility plant. The utility continues to rely on rate
flexibility to effectively prevent bypass of our distribution system. Even
though the utility enjoys a market saturation rate much higher than the
national average, customer growth in the service territory is limited. Alagasco
will continue to focus on the acquisition of municipal gas systems to
supplement normal growth.

EXPLORATION AND PRODUCTION: During fiscal year 1998, Taurus plans to spend
approximately $165 million, including $100 million for property acquisitions.
Amounts invested could vary depending on the available opportunities.
Production is expected to increase almost 50 percent to 55 Bcfe, and proved
reserves could reach 750 Bcfe by year end. Production from existing properties
should generate 52 Bcfe of oil and gas during the year, with an additional 3
Bcfe from as yet unidentified acquisitions. As Taurus begins fiscal 1998, 83
percent of its estimated gas production and 39 percent of its estimated oil
production is hedged or under contract at average prices of $2.26 per Mcf and
$20.29 per barrel, respectively. As acquisitions are made, Taurus will use
futures, swaps and/or fixed-price contracts to lock in commodity prices for up
to 36 months in order to protect targeted returns. A significant part of
Taurus's earnings in fiscal 1998 will be the more than $14 million of tax
credits expected to be generated by the Company's coalbed methane production.

Taurus plans to spend $500 million to $650 million in the acquisition and
development of producing properties and in exploration and related development
over the next three years. With this level of spending, Taurus's production
levels could reach 85 Bcfe to 95 Bcfe by the end of fiscal year 2000, with
proved reserves of up to 1 trillion cubic feet equivalent.

FORWARD-LOOKING STATEMENTS AND RISK: Certain statements in this report,
including statements of the future plans, objectives, and expected performance
of the Company and its subsidiaries, are forward-looking statements that are
dependent on certain events, risks and uncertainties that may be outside their
control which could cause actual results to differ materially from those
anticipated. Some of these include, but are not limited to, economic and
competitive conditions, inflation rates, legislative and regulatory changes,
financial market conditions, future business decisions, and other
uncertainties, all of which are difficult to predict. There are numerous
uncertainties inherent in estimating quantities of proved oil and gas reserves
and in projecting future rates of production and timing of development
expenditures. The total amount or timing of actual future production may vary
significantly from reserves and production estimates. In the event Taurus is
unable to invest fully its planned acquisition expenditures, future operating
revenues and proved reserves could be negatively affected. The drilling of
exploratory wells can involve significant risks including those related to
timing, success rates and cost overruns. These risks can be affected by lease
and rig availability, complex geology and other factors. Results of operations
and cash flows also could be affected by future oil and gas prices. Although
Taurus makes use of futures, swaps and fixed-price contracts to mitigate risk,
fluctuations in oil and gas prices may affect the Company's financial position
and results of operations.

RECENT PRONOUNCEMENTS OF THE FASB
In fiscal 1997, the Company adopted SFAS No. 123, Accounting for Stock-Based
Compensation, which establishes a fair value-based method of accounting for
employee stock options. The Statement allows companies to continue to follow
the accounting treatment prescribed by APB Opinion 25 with proper disclosure.
The Company has adopted the disclosure-only provisions of SFAS 123 (see Note
6).

                                                                             27


<PAGE>   8


In 1997, the Company adopted SFAS No. 125, Accounting for Transfers and
Servicing of Financial Assets and Extinguishment of Liabilities, which provides
accounting and reporting standards for such transactions. The adoption did not
have a material impact on the consolidated financial statements.

In February 1997, the FASB issued SFAS No. 128, Earnings Per Share, which
specifies computation, presentation, and disclosure requirements for EPS, and
SFAS No. 129, Disclosures of Information about Capital Structure, which
establishes standards for disclosing information about an entity's capital
structure. The Company is required to adopt these statements in its 1998 fiscal
year. In June 1997, the FASB issued SFAS No. 130, Reporting Comprehensive
Income, which requires the reporting and display of comprehensive income and
its components in an entity's financial statements, and SFAS No. 131,
Disclosures about Segments of an Enterprise and Related Information, which
specifies revised guidelines for determining an entity's operating segments and
the type and level of financial information to be required. The Company is
required to adopt these statements in fiscal year 1999.

QUARTERLY MARKET PRICES AND DIVIDENDS PAID PER SHARE
<TABLE>
<CAPTION>
- -------------------------------------------------------------------------------------------------------------------
Quarter ended (in dollars)                              High            Low           Close          Dividends Paid
- -------------------------------------------------------------------------------------------------------------------
<S>                                                    <C>             <C>            <C>            <C>
December 31, 1995....................................  25 1/8          21 3/8         24 1/8               .29
March 31, 1996.......................................  25 3/8          21 3/4         21 7/8               .29
June 30, 1996........................................  24 1/4          21 7/8         22 1/8               .29
September 30, 1996...................................  25              22             24                   .30
- -------------------------------------------------------------------------------------------------------------------
December 31, 1996....................................  31 1/4          23 3/4         30 1/4               .30
March 31, 1997.......................................  31 3/8          29             29 7/8               .30
June 30, 1997........................................  35 1/8          29 1/8         33 11/16             .30
September 30, 1997...................................  37 3/4          33 1/4         35 9/16              .31
- -------------------------------------------------------------------------------------------------------------------
</TABLE>




28


<PAGE>   9


CONSOLIDATED STATEMENTS OF INCOME

<TABLE>
<CAPTION>
Energen Corporation
- -------------------------------------------------------------------------------------------------------------------------
Years ended September 30, (in thousands, except share data)                 1997               1996             1995
- -------------------------------------------------------------------------------------------------------------------------
<S>                                                                    <C>                <C>               <C>
OPERATING REVENUES
Natural gas distribution.............................................  $   362,984        $   357,252       $   295,967
Oil and gas production activities....................................       85,246             42,190            22,613
- -----------------------------------------------------------------------------------------------------------------------
   Total operating revenues..........................................      448,230            399,442           318,580
- -----------------------------------------------------------------------------------------------------------------------
OPERATING EXPENSES
Cost of gas..........................................................      175,514            178,810           130,220
Operations...........................................................      116,886            100,822            93,293
Maintenance..........................................................       11,112             11,078             9,849
Depreciation, depletion and amortization.............................       59,688             41,118            29,556
Taxes, other than income taxes.......................................       33,044             28,817            23,629
- -----------------------------------------------------------------------------------------------------------------------
   Total operating expenses..........................................      396,244            360,645           286,547
- -----------------------------------------------------------------------------------------------------------------------
OPERATING INCOME.....................................................       51,986             38,797            32,033
- -----------------------------------------------------------------------------------------------------------------------
OTHER INCOME (EXPENSE)
Interest expense, net of amounts capitalized.........................      (22,906)           (13,920)          (11,693)
Other, net...........................................................        3,014              1,712             2,649
- -----------------------------------------------------------------------------------------------------------------------
   Total other income (expense)......................................      (19,892)           (12,208)           (9,044)
- -----------------------------------------------------------------------------------------------------------------------
INCOME BEFORE INCOME TAXES...........................................       32,094             26,589            22,989
Income taxes.........................................................        3,097              5,048             3,681
- -----------------------------------------------------------------------------------------------------------------------
NET INCOME...........................................................  $    28,997        $    21,541       $    19,308
- -----------------------------------------------------------------------------------------------------------------------
EARNINGS PER AVERAGE COMMON SHARE....................................  $      2.31        $      1.95       $      1.77
- -----------------------------------------------------------------------------------------------------------------------
AVERAGE COMMON SHARES OUTSTANDING....................................   12,563,096         11,023,434        10,906,315
- -----------------------------------------------------------------------------------------------------------------------
</TABLE>




The accompanying Notes to Consolidated Financial Statements are an integral
part of these statements.

                                                                             29


<PAGE>   10


CONSOLIDATED BALANCE SHEETS

<TABLE>
<CAPTION>
Energen Corporation
- --------------------------------------------------------------------------------------------------------------
As of September 30, (in thousands)                                                  1997             1996
- --------------------------------------------------------------------------------------------------------------
<S>                                                                            <C>               <C>
ASSETS

CURRENT ASSETS

Cash and cash equivalents............................................          $   105,402       $    11,301
Accounts receivable, net of allowance for doubtful accounts of
   $3,185 in 1997 and $3,002 in 1996.................................               70,676            48,126
Inventories, at average cost
   Storage gas inventory.............................................               25,367            28,214
   Materials and supplies............................................                7,281             7,704
   Liquified natural gas in storage..................................                3,630             2,417
Deferred income taxes................................................                7,438             7,995
Prepayments and other................................................               22,371             8,949
- ------------------------------------------------------------------------------------------------------------
     Total current assets............................................              242,165           114,706
- ------------------------------------------------------------------------------------------------------------
PROPERTY, PLANT AND EQUIPMENT
Oil and gas properties, successful efforts method....................              454,210           224,469
Less accumulated depreciation, depletion and amortization                           87,554            60,152
- ------------------------------------------------------------------------------------------------------------
Oil and gas properties, net..........................................              366,656           164,317
- ------------------------------------------------------------------------------------------------------------
Utility plant........................................................              583,630           544,643
Less accumulated depreciation........................................              287,749           268,110
- ------------------------------------------------------------------------------------------------------------
   Utility plant, net................................................              295,881           276,533
- ------------------------------------------------------------------------------------------------------------
Other property, net..................................................                4,466             4,066
- ------------------------------------------------------------------------------------------------------------
Total property, plant and equipment, net.............................              667,003           444,916
- ------------------------------------------------------------------------------------------------------------
OTHER ASSETS
Deferred income taxes................................................                1,144              (972)
Deferred charges and other...........................................                9,485            10,760
- ------------------------------------------------------------------------------------------------------------
   Total other assets................................................               10,629             9,788
- ------------------------------------------------------------------------------------------------------------
TOTAL ASSETS.........................................................          $   919,797       $   569,410
- ------------------------------------------------------------------------------------------------------------
</TABLE>





The accompanying Notes to Consolidated Financial Statements are an integral
part of these statements.

30


<PAGE>   11





<TABLE>
<CAPTION>
- -------------------------------------------------------------------------------------------------------------------------
As of September 30, (in thousands)                                                             1997             1996
- -------------------------------------------------------------------------------------------------------------------------
<S>                                                                                       <C>               <C>
CAPITAL AND LIABILITIES

CURRENT LIABILITIES

Long-term debt due within one year...................................                     $     1,855       $     1,805
Notes payable to banks...............................................                         202,000            59,000
Accounts payable.....................................................                          49,196            32,659
Accrued taxes........................................................                          18,300            17,567
Customers deposits...................................................                          16,399            17,364
Amounts due customers................................................                           7,347            17,157
Accrued wages and benefits...........................................                          13,719            11,584
Other................................................................                          21,935            18,049
- -------------------------------------------------------------------------------------------------------------------------
   Total current liabilities.........................................                         330,751           175,185
- -------------------------------------------------------------------------------------------------------------------------
DEFERRED CREDITS AND OTHER LIABILITIES
Other................................................................                           8,301            10,275
- -------------------------------------------------------------------------------------------------------------------------
   Total deferred credits and other liabilities......................                           8,301            10,275
- -------------------------------------------------------------------------------------------------------------------------
COMMITMENTS AND CONTINGENCIES........................................                              --                --
- -------------------------------------------------------------------------------------------------------------------------
CAPITALIZATION
Preferred stock, cumulative, $0.01 par value, 5,000,000 shares authorized                          --             --
   Common shareholders equity
     Common stock, $0.01 par value; 30,000,000 shares authorized, 14,398,109
       shares outstanding in 1997 and 11,162,634
       shares outstanding in 1996....................................                             144               112
     Premium on capital stock........................................                         185,841            86,833
     Capital surplus.................................................                           2,802             2,802
     Retained earnings...............................................                         112,356            98,658
- -------------------------------------------------------------------------------------------------------------------------
   Total common shareholders equity..................................                         301,143           188,405
Long-term debt.......................................................                         279,602           195,545
- -------------------------------------------------------------------------------------------------------------------------
   Total capitalization..............................................                         580,745           383,950
- -------------------------------------------------------------------------------------------------------------------------
TOTAL CAPITAL AND LIABILITIES........................................                     $   919,797       $   569,410
- -------------------------------------------------------------------------------------------------------------------------
</TABLE>





                                                                             31


<PAGE>   12


CONSOLIDATED STATEMENTS OF SHAREHOLDERS EQUITY

<TABLE>
<CAPTION>
Energen Corporation
- -----------------------------------------------------------------------------------------------------------------------------
(In thousands, except share amounts)
- -----------------------------------------------------------------------------------------------------------------------------
                                   Common Stock                                                     Treasury Stock
                                    Number of       Par      Premium on       Capital     Retained    Number of
                                     Shares        Value    Capital Stock     Surplus     Earnings      Shares         Cost
- -----------------------------------------------------------------------------------------------------------------------------
<S>                                <C>           <C>        <C>           <C>         <C>           <C>
BALANCE AT SEPTEMBER 30, 1994        10,917,904  $   109    $   81,073    $  2,802    $    83,042           --     $     --
Net income                                                                                 19,308
Purchase of treasury shares                                                                           (128,900)      (2,721)
Shares issued for:
   Dividend reinvestment plan                                       14                                  19,035          394
   Employee benefit plans                 3,829                    156                                  98,238        2,077
Cash dividends - $1.13 per share                                                          (12,330)
- ---------------------------------------------------------------------------------------------------------------------------
BALANCE AT SEPTEMBER 30, 1995        10,921,733      109        81,243       2,802         90,020      (11,627)        (250)
Net income                                                                                 21,541
Purchase of treasury shares                                                                            (86,900)      (1,985)
Shares issued for:
   Dividend reinvestment plan            80,529        1         1,827                                  66,552        1,511
   Employee benefit plans               160,372        2         3,763                                  31,975          724
Cash dividends - $1.17 per share                                                          (12,903)
- ---------------------------------------------------------------------------------------------------------------------------
BALANCE AT SEPTEMBER 30, 1996        11,162,634      112        86,833       2,802         98,658           --           --
Net income                                                                                 28,997
Shares issued for:
   Stock Offerings                    2,925,000       29        89,867
   Dividend reinvestment plan           120,802        1         3,611
   Employee benefit plans               189,673        2         5,530
Cash dividends - $1.21 per share                                                          (15,299)
- ----------------------------------------------------------------------------------------------------------------------------
BALANCE AT SEPTEMBER 30, 1997        14,398,109  $   144    $  185,841    $  2,802    $   112,356           --     $     --
- ----------------------------------------------------------------------------------------------------------------------------
</TABLE>



The accompanying Notes to Consolidated Financial Statements are an integral
part of these statements.

32


<PAGE>   13


CONSOLIDATED STATEMENTS OF CASH FLOWS

<TABLE>
<CAPTION>
Energen Corporation
- -------------------------------------------------------------------------------------------------------------------------
Years ended September 30, (in thousands)                                    1997               1996             1995
- -------------------------------------------------------------------------------------------------------------------------
<S>                                                                     <C>                <C>               <C>
OPERATING ACTIVITIES
Net income...........................................................   $    28,997        $    21,541       $    19,308
Adjustments to reconcile net income to net cash
   provided by operating activities:
   Depreciation, depletion and amortization..........................        59,688             41,118            29,556
   Deferred income taxes, net........................................        (2,646)              (672)           (2,082)
   Deferred investment tax credits, net..............................          (487)              (487)             (487)
   Gain on sale of assets............................................        (1,081)            (3,954)               --
   Net change in:
     Accounts receivable.............................................       (22,550)           (17,313)            3,332
     Inventories.....................................................         2,057             (6,809)            3,775
     Deferred gas cost...............................................          (537)              (549)               34
     Accounts payable gas purchases...................................        5,758             (1,614)            9,882
     Accounts payable trade...........................................       10,779              2,031            (5,120)
     Amounts due customers...........................................        (9,810)            13,942             2,483
     Other current assets and liabilities............................        (6,996)            (2,272)           (3,290)
   Other, net........................................................         3,610              1,722             3,478
- ------------------------------------------------------------------------------------------------------------------------
     Net cash provided by operating activities.......................        66,782             46,684            60,869
- ------------------------------------------------------------------------------------------------------------------------
INVESTING ACTIVITIES
Additions to property, plant and equipment...........................      (283,274)          (168,414)          (68,940)
Proceeds from sale of assets.........................................         1,871             13,134                --
Payments on notes receivable.........................................           527              1,557               816
Other, net...........................................................         1,030              1,627               501
- ------------------------------------------------------------------------------------------------------------------------
     Net cash used in investing activities...........................      (279,846)          (152,096)          (67,623)
- ------------------------------------------------------------------------------------------------------------------------
FINANCING ACTIVITIES
Payment of dividends on common stock.................................       (15,299)           (12,903)          (12,330)
Issuance of common stock.............................................        95,357              4,645                84
Purchase of treasury stock...........................................            --             (1,985)           (2,721)
Reduction of long-term debt..........................................          (943)            (1,025)          (45,070)
Proceeds from issuance of long-term debt.............................        84,416             64,586            49,660
Note payable issued to purchase U.S. Treasury securities.............        98,636                 --                --
Net change in short-term debt........................................        44,998             26,700            26,300
- ------------------------------------------------------------------------------------------------------------------------
     Net cash provided by financing activities.......................       307,165             80,018            15,923
- ------------------------------------------------------------------------------------------------------------------------
Net change in cash and cash equivalents..............................        94,101            (25,394)            9,169
Cash and cash equivalents at beginning of period.....................        11,301             36,695            27,526
- ------------------------------------------------------------------------------------------------------------------------
Cash and cash equivalents at end of period...........................   $   105,402        $    11,301       $    36,695
- ------------------------------------------------------------------------------------------------------------------------
</TABLE>



The accompanying Notes to Consolidated Financial Statements are an integral
part of these statements.

                                                                             33


<PAGE>   14


NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

Energen Corporation

1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Energen Corporation (the Company) is a diversified energy holding company
engaged primarily in the purchase, distribution, and sale of natural gas,
principally in central and north Alabama (natural gas distribution), and in the
exploration, production, acquisition and development of oil and gas in the
continental United States (oil and gas exploration and production). The
following is a description of the Company's significant accounting policies and
practices.

A.PRINCIPLES OF CONSOLIDATION
   The accompanying financial statements include the accounts of the Company
   and its subsidiaries, principally Alabama Gas Corporation (Alagasco) and
   Taurus Exploration Inc. (Taurus), after elimination of all significant
   intercompany transactions in consolidation. Certain reclassifications have
   been made to conform the prior years financial statements to the
   current-year presentation.

B.NATURAL GAS DISTRIBUTION
   UTILITY PLANT AND DEPRECIATION: Property, plant and equipment is stated at
   cost. The cost of utility plant includes an allowance for funds used during
   construction. Maintenance is charged for the cost of normal repairs and the
   renewal or replacement of an item of property which is less than a
   retirement unit. When property which represents a retirement unit is
   replaced or removed, the cost of such property is credited to utility plant
   and, together with the cost of removal less salvage, is charged to the
   accumulated reserve for depreciation. Depreciation is provided on the
   straight-line method over the estimated useful lives of utility property at
   rates established by the Alabama Public Service Commission (APSC). Approved
   depreciation rates averaged approximately 4.4 percent in 1997 and 4.3
   percent in 1996 and 1995.

   INVENTORIES:  Inventories, which consist primarily of gas stored
   underground, are stated at average cost.

   OPERATING REVENUE AND GAS COSTS: In accordance with industry practice,
   Alagasco records natural gas distribution revenues on a monthly- and
   cycle-billing basis. The commodity cost of purchased gas applicable to gas
   delivered to customers but not yet billed under the cycle-billing method is
   deferred as a current asset.

   REGULATORY ACCOUNTING: Alagasco is subject to the provisions of Statement of
   Financial Accounting Standard (SFAS) No. 71, Accounting for the Effects of
   Certain Types of Regulation. In general, SFAS No. 71 allows utilities to
   capitalize or defer certain costs or revenues, based upon orders received
   from regulatory authorities, to be recovered from or refunded to customers
   in future periods.

C.OIL AND GAS EXPLORATION AND PRODUCTION
   PROPERTY AND RELATED DEPLETION: Taurus follows the successful efforts method
   of accounting for costs incurred in the exploration and development of oil
   and gas reserves. Lease acquisition costs are capitalized initially, and
   unproved properties are reviewed periodically to determine if there has been
   impairment of the carrying value, with any such impairment charged to
   exploration expense currently. Exploratory drilling costs are capitalized
   pending determination of proved reserves. If proved reserves are not
   discovered, the exploratory drilling costs are expensed. Other exploration
   costs, including geological and geophysical costs, are expensed as incurred.
   All development costs are capitalized. Depreciation, depletion and
   amortization is determined on a field-by-field basis using the
   unit-of-production method based on proved reserves. A provision for
   anticipated abandonment and restoration costs at the end of a property's
   useful life is made through depreciation expense.

   OPERATING REVENUE: Taurus utilizes the sales method of accounting to
   recognize oil and gas production revenue. Under the sales method, revenue is
   recognized for the Company's total takes of oil and gas production, and
   overproduction liabilities are established only when it is estimated that a
   property's overproduced volumes exceed the net share of remaining reserves
   for such property. The Company has no significant production imbalances at
   September 30, 1997. Gains and losses on the sale of property in the ordinary
   course of business are classified as operating revenue.

   DERIVATIVE COMMODITY INSTRUMENTS: Taurus periodically enters into derivative
   commodity instruments to hedge its exposure to price fluctuations on oil and
   gas production. Such instruments include regulated natural gas and crude oil
   futures contracts traded on the New York Mercantile Exchange and
   over-the-counter swaps and basis hedges with major energy derivative product
   specialists. These transactions are accounted for under the hedge method of
   accounting. Under this method, any unrealized gains and losses are recorded
   as a current receivable/payable and a deferred gain/loss. Realized gains and
   losses are deferred until the revenues from the related hedged volumes are
   recognized in the income statement. These realized deferred gains and losses
   are reflected in current liabilities or current assets, respectively. Cash
   flows from derivative instruments are recognized as

34


<PAGE>   15



  incurred through changes in working capital. All hedge transactions are
  subject to the Company's risk management policy, approved by the Board of
  Directors, which does not permit speculative positions. To apply the hedge
  method of accounting, management must demonstrate that a high correlation
  exists between the value of the derivative commodity instrument and the value
  of the item hedged. Management uses the historic relationships between the
  derivative instruments and the sales prices of the hedged volumes to ensure
  that a high level of correlation exists.

D.INCOME TAXES
   The Company's deferred income taxes reflect the impact of temporary
   differences between the tax basis of assets and liabilities and their
   carrying amounts for financial reporting purposes.

E.CASH EQUIVALENTS
   The Company includes highly liquid marketable securities and debt
   instruments purchased with a maturity of three months or less in cash
   equivalents.

F.ESTIMATES
   The preparation of financial statements in conformity with generally
   accepted accounting principles requires management to make estimates and
   assumptions that affect the reported amounts of assets and liabilities at
   the date of the financial statements and the reported amount of revenues and
   expenses during the reporting period. Actual results could differ from those
   estimates. Significant estimates with regard to these financial statements
   include the estimate of proved oil and gas reserve volumes and the related
   present value of estimated future net revenues therefrom (see Note 13).


2. REGULATORY MATTERS
As an Alabama utility, Alagasco is subject to regulation by the Alabama
Public Service Commission (APSC) which, in 1983, established the Rate
Stabilization and Equalization (RSE) rate-setting process. RSE was extended
with modifications in 1985, 1987 and 1990. On October 7, 1996, RSE was
extended, without change, for a five-year period through January 1, 2002. Under
the terms of that extension, RSE will continue after January 1, 2002, unless,
after notice to the Company and a hearing, the Commission votes to either
modify or discontinue its operation.

Under RSE as extended, the APSC conducts quarterly reviews to determine, based
on Alagasco's projections and fiscal year-to-date performance, whether
Alagasco's return on equity for the fiscal year will be within the allowed
range of 13.15 percent to 13.65 percent. Reductions in rates can be made
quarterly to bring the projected return within the allowed range; increases,
however, are allowed only once each fiscal year, effective December 1, and
cannot exceed 4 percent of prior-year revenues. RSE limits the utility's equity
upon which a return is permitted to 60 percent of total capitalization and
provides for certain cost control measures designed to monitor Alagasco's
operations and maintenance (O&M) expense. If the change in O&M expense per
customer falls within 1.25 percentage points above or below the Consumer Price
Index For All Urban Customers (index range), no adjustment is required. If,
however, the change in O&M expense per customer exceeds the index range,
three-quarters of the difference is returned to customers. To the extent the
change is less than the index range, the utility benefits by one-half of the
difference through future rate adjustments. Under RSE as extended, a $1.3
million annual decrease in revenue became effective October 1, 1996, a $7.7
million annual increase became effective December 1, 1996, and a $1.5 million
annual decrease became effective April 1, 1997.

Alagasco calculates a temperature adjustment to customers' monthly bills to
remove the effect of departures from normal temperature on Alagasco's earnings.
The calculation is performed monthly, and the adjustments to customers bills
are made in the same billing cycle the weather variation occurs. Alagasco's
rate schedules for natural gas distribution charges contain a Gas Supply
Adjustment (GSA) rider, established in 1993, which permits the pass-through to
customers of changes in the cost of gas supply, including Gas Supply
Realignment (GSR) surcharges imposed by Alagasco's suppliers resulting from
changes in gas supply purchases related to the implementation of Federal Energy
Regulatory Commission (FERC) Order 636. The APSC on October 7, 1996, issued an
order providing for the refund to customers prior to January 31, 1997 of
approximately $17 million of supplier refunds, including interest. The Company
refunded these amounts to customers during January 1997. The refunds were
collected from a variety of sources and most relate to the settlement of rate
case and FERC Order 636 proceedings of Southern Natural Gas Company (Southern)
as described herein.

In accordance with APSC-directed regulatory accounting procedures, Alagasco in
1989 began returning to customers excess utility deferred taxes which resulted
from a reduction in the federal statutory tax rate from 46 percent to 34
percent using the average rate assumption method. This method provides for the
return to ratepayers of excess deferred taxes over the lives of the related
assets. In 1993 those excess taxes were reduced as a result of a federal tax
rate increase from 34 percent to 35 percent. Remaining excess utility deferred
taxes of $2.1 million are being returned to ratepayers over approximately 13
years. At September 30, 1997 and 1996, a regulatory liability related to income
taxes of $3.7 million and $5 million, respectively, was included in the
consolidated financial statements.

                                                                             35


<PAGE>   16




The excess of total acquisition costs over book value of net assets of acquired
municipal gas distribution systems is included in utility plant and is being
amortized on a straight-line basis over approximately 23 years. At September
30, 1997 and 1996, the net acquisition adjustment was $16.4 million and $16.7
million, respectively.

FERC REGULATION: In 1995 Southern filed a comprehensive settlement with the
FERC in the form of a Stipulation and Agreement (the Settlement) to resolve all
issues in Southern's six then-pending rate cases as well as to resolve all GSR
and transition cost issues resulting from the implementation of FERC Order 636.
Alagasco was a supporting party to the Settlement. The Settlement, as approved
by the FERC, resolves all issues relating to GSR and other transition costs
with respect to supporting parties. Alagasco estimates that it has a remaining
GSR liability of approximately $0.1 million to be paid through December 1998
and approximately $0.7 million in other transition costs to be paid through
June 1998. Because these costs will be recovered in full from its customers,
Alagasco recorded a regulatory asset of $0.8 million and $2.2 million at
September 30, 1997 and 1996, respectively.

3. LONG-TERM DEBT AND NOTES PAYABLE

<TABLE>
<CAPTION>
Long-term debt consists of the following:
- -------------------------------------------------------------------------------------------------------------------------
As of September 30, (in thousands)                                                             1997             1996
- -------------------------------------------------------------------------------------------------------------------------
<S>                                                                                       <C>               <C>
Energen Corporation:
   Medium-term Notes, interest ranging from 6.6% to 8.09%, for notes
     redeemable September 20, 2001, to July 28, 2027.................                     $   125,000       $    40,000
   8% Debentures, due up to $1,000,000 annually to February 1, 2007                            18,704            18,714
   Series 1993 Notes, interest ranging from 5.6% to 7.25%, due annually in
     payments ranging from $855,000 to $1,584,000 from March 1, 1998,
     to March 1, 2008................................................                          12,753            13,636
Alabama Gas Corporation:
   Medium-term Notes, interest ranging from 5.4% to 7.97%, for notes
   redeemable December 1, 1998, to September 23, 2026................                         125,000           125,000
- -------------------------------------------------------------------------------------------------------------------------
Total................................................................                         281,457           197,350
Less amounts due within one year.....................................                           1,855             1,805
- -------------------------------------------------------------------------------------------------------------------------
   Total.............................................................                     $   279,602       $   195,545
- -------------------------------------------------------------------------------------------------------------------------
</TABLE>


The aggregate maturities of long-term debt for the next five years are as
follows:

<TABLE>
<CAPTION>
- -------------------------------------------------------------------------------------------------------------------
                                           Years ending September 30, (in thousands)
- -------------------------------------------------------------------------------------------------------------------------
       <S>                      <C>                   <C>                          <C>                    <C>      
            1998                     1999                   2000                       2001                   2002
- -------------------------------------------------------------------------------------------------------------------------
       $    1,855               $    7,209            $    1,955                   $   18,648             $   17,077
- -------------------------------------------------------------------------------------------------------------------------
</TABLE>


The Company is subject to various restrictions on the payment of dividends.
Under its 8 percent debentures, the most restrictive provision states that
dividends or other distributions with respect to common stock may not be made
unless the Company maintains a minimum consolidated tangible net worth of $80
million; at September 30, 1997, Energen had a tangible net worth of $300.9
million.

Energen and Alagasco have short-term credit lines and other credit facilities
of $203 million available to either entity for working capital needs. At
September 30, 1997, the Company borrowed $50 million under separate agreement
to purchase U.S. Treasury securities for Alabama shares tax planning purposes.
The securities were pledged as collateral on the debt. In total, at year-end,
the Company had $98.6 million of borrowings to purchase Treasury securities.
The securities matured in early October and the proceeds were used to repay
such borrowings. The following is a summary of information relating to notes
payable to banks:

36


<PAGE>   17


<TABLE>
<CAPTION>
- ----------------------------------------------------------------------------------------------------------------------------
As of September 30, (in thousands)                                                1997              1996             1995
- ----------------------------------------------------------------------------------------------------------------------------
<S>                                                                          <C>               <C>               <C>
Amount outstanding...................................                        $   152,000       $    59,000       $   32,300
Amount outstanding under separate agreement..........                             50,000                --               --
- ---------------------------------------------------------------------------------------------------------------------------
Notes payable to banks...............................                        $   202,000       $    59,000       $   32,300
Available for borrowings.............................                             51,000            97,000           77,700
- ---------------------------------------------------------------------------------------------------------------------------
   Total.............................................                        $   253,000       $   156,000       $  110,000
- ---------------------------------------------------------------------------------------------------------------------------
Maximum amount outstanding at any month-end                                  $   202,000       $    95,000       $   32,300
Average daily amount outstanding.....................                        $    87,648       $    37,960       $      917
Weighted average interest rates based on:
   Average daily amount outstanding..................                               5.87%             5.68%            5.76%
   Amount outstanding at year-end....................                               5.96%             5.62%            5.96%
- ---------------------------------------------------------------------------------------------------------------------------
</TABLE>

Total interest expense for Energen in 1997, 1996 and 1995 was $22,906,000,
$13,920,000, and $11,693,000, respectively.

4. INCOME TAXES
The components of income taxes consist of the following:
<TABLE>
<CAPTION>
- ----------------------------------------------------------------------------------------------------------------------------
For the years ended September 30, (in thousands)                                  1997             1996              1995
- ----------------------------------------------------------------------------------------------------------------------------
<S>                                                                          <C>               <C>               <C>
Taxes estimated to be payable currently:
   Federal...........................................                        $     4,976       $     5,218       $    5,377
   State.............................................                              1,254               989              873
- ---------------------------------------------------------------------------------------------------------------------------
     Total current...................................                              6,230             6,207            6,250
- ---------------------------------------------------------------------------------------------------------------------------
Taxes deferred:
   Federal...........................................                             (3,123)           (1,221)          (2,580)
   State.............................................                                (10)               62               11
- ---------------------------------------------------------------------------------------------------------------------------
   Total deferred....................................                             (3,133)           (1,159)          (2,569)
- ---------------------------------------------------------------------------------------------------------------------------
Total income tax expense.............................                        $     3,097       $     5,048       $    3,681
- ---------------------------------------------------------------------------------------------------------------------------
</TABLE>


Temporary differences and carryforwards which give rise to a significant
portion of deferred tax assets and liabilities for 1997 and 1996 are as
follows:

<TABLE>
<CAPTION>
- ----------------------------------------------------------------------------------------------------------------------------
As of September 30, (in thousands)                                       1997                               1996
- ----------------------------------------------------------------------------------------------------------------------------
                                                               Current        Noncurrent          Current        Noncurrent
                                                               -------        ----------          -------        ----------
<S>                                                         <C>              <C>               <C>               <C>
Deferred tax assets:
   Regulatory liabilities............................       $        --      $     1,356       $        --       $    1,872
   Minimum tax credit................................                --           20,541                --           16,379
   Insurance and accruals............................             2,410               --             2,487               --
   Unbilled revenue..................................             1,699               --             1,658               --
   Other, net........................................             5,559            1,570             5,812            1,952
- ---------------------------------------------------------------------------------------------------------------------------
      Subtotal.......................................             9,668           23,467             9,957           20,203
      Valuation allowance............................                --               --                --               --
- ---------------------------------------------------------------------------------------------------------------------------
        Total deferred tax assets....................             9,668           23,467             9,957           20,203
- ---------------------------------------------------------------------------------------------------------------------------
Deferred tax liabilities:
   Depreciation and basis differences................                --           20,893                --           20,187
   Gas supply adjustment.............................             1,308               --               500               --
   Other, net........................................               922            1,430             1,462              988
- ---------------------------------------------------------------------------------------------------------------------------
        Total deferred tax liabilities...............             2,230           22,323             1,962           21,175
- ---------------------------------------------------------------------------------------------------------------------------
Net deferred tax assets (liabilities)................       $     7,438      $     1,144       $     7,995       $     (972)
- ---------------------------------------------------------------------------------------------------------------------------
</TABLE>


No valuation allowance with respect to deferred taxes is deemed necessary as
the Company anticipates generating adequate future taxable income to realize
the benefits of all deferred tax assets on the consolidated balance sheet. As
of September 30, 1997, the amount of minimum tax credit which can be carried
forward indefinitely to reduce future regular tax liability is $20.5 million.

                                                                             37


<PAGE>   18



Total income tax expense differs from the amount which would be provided by
applying the statutory federal income tax rate to earnings before taxes as
illustrated below:

<TABLE>
<CAPTION>
- -----------------------------------------------------------------------------------------------------------------------------
For the years ended September 30, (in thousands)                                  1997             1996              1995
- -----------------------------------------------------------------------------------------------------------------------------
<S>                                                                          <C>               <C>               <C>
Income tax expense at statutory federal income tax rate                      $    11,233       $     9,306       $     8,046
   Increase (decrease) resulting from:
   Nonconventional fuels credits.....................                             (8,058)           (4,221)           (4,122)
   Deferred investment tax credits ..................                               (487)             (487)             (487)
   State income taxes, net of federal income tax benefit                             813               681               625
   Other, net........................................                               (404)             (231)             (381)
- ------------------------------------------------------------------------------------------------------------ ---------------
      Total income tax expense.......................                        $     3,097       $     5,048       $     3,681
- ----------------------------------------------------------------------------------------------------------------------------
</TABLE>


5. EMPLOYEE BENEFIT PLANS

The Company has two defined benefit non-contributory pension plans which cover
a majority of the employees. Benefits are based on years of service and final
earnings. The Company's policy is to use the "projected unit credit" actuarial
method for funding and financial reporting purposes. The expense for the plan
covering the majority of employees (Plan A) for the years ended September 30,
1997, 1996 and 1995 was $1,228,000, $412,000, and $1,158,000, respectively. The
expense for the second plan covering employees under certain labor union
agreements (Plan B) for 1997, 1996 and 1995 was $437,000, $197,000, and
$339,000, respectively.

The funded status of the plans is as follows:

<TABLE>
<CAPTION>
- -----------------------------------------------------------------------------------------------------------------------------
As of June 30, (in thousands)                                            Plan A                            Plan B
- -----------------------------------------------------------------------------------------------------------------------------
                                                                1997             1996              1997              1996
                                                                ----             ----              ----              ----
<S>                                                         <C>              <C>               <C>
Vested benefits......................................       $   (57,617)     $   (56,828)      $   (14,610)      $  (14,210)
Nonvested benefits...................................            (4,739)          (4,323)           (2,256)          (2,336)
- ---------------------------------------------------------------------------------------------------------------------------
Accumulated benefit obligation.......................           (62,356)         (61,151)          (16,866)         (16,546)
Effects of salary progression........................           (11,402)         (12,607)               --               --
- ---------------------------------------------------------------------------------------------------------------------------
Projected benefit obligation.........................           (73,758)         (73,758)          (16,866)         (16,546)
Fair value of plan assets, primarily equity and
   fixed income securities...........................            84,859           80,750            20,820           18,358
Unrecognized net (gain) loss.........................            (6,477)            (337)           (2,747)            (433)
Unrecognized prior service cost......................                29               35               998            1,205
Unrecognized net transition obligation (asset).......            (3,494)          (4,303)              282              340
- ---------------------------------------------------------------------------------------------------------------------------
Accrued pension asset................................       $     1,159      $     2,387       $     2,487       $    2,924
- ---------------------------------------------------------------------------------------------------------------------------
</TABLE>


At September 30, 1997 and 1996, for both plans the discount rate used to
measure the projected benefit obligation was 7.75 percent, and the expected
long-term rate of return on plan assets was 8.25 percent. The annual rate of
salary increase for the salaried plan was 5.75 percent in both years.

38


<PAGE>   19



The components of net pension expense for 1997, 1996 and 1995 were:

<TABLE>
<CAPTION>
- -----------------------------------------------------------------------------------------------------------------------------
For the years ended September 30, (in thousands)               Plan A                                  Plan B
- -----------------------------------------------------------------------------------------------------------------------------
                                                   1997          1996         1995         1997         1996         1995
                                                   ----          ----         ----         ----         ----         ----
<S>                                              <C>          <C>          <C>          <C>          <C>           <C>
Service cost                                     $   2,227    $   2,147    $   2,052    $     243    $     255     $    224
Interest cost on projected benefit obligation        5,524        4,617        4,728        1,238        1,166        1,095
Actual (return) on plan assets                     (12,629)     (15,280)      (8,787)      (3,803)      (2,971)      (2,172)
Net amortization and deferral                        6,106        8,928        2,106        2,759        1,747        1,192
Loss due to special termination benefits                --           --        1,489           --           --           --
Settlement gain                                         --           --         (430)          --           --           --
- ---------------------------------------------------------------------------------------------------------------------------
Net pension expense                              $   1,228    $     412    $   1,158    $     437    $     197     $    339
- ---------------------------------------------------------------------------------------------------------------------------
</TABLE>



In 1995 the Company recognized a loss for special termination benefits of
$1,489,000 and a settlement gain of $430,000 pursuant to a voluntary early
retirement option offered to all salaried, non-officer employees of at least 58
years of age with a minimum of 5 years service. Of the 55 eligible employees,
41 accepted.

The Company has deferred compensation plan agreements with certain key
executives providing for payments on retirement, termination, death or
disability. Expense under these agreements for 1997, 1996 and 1995 was
$399,000, $1,002,000, and $808,000, respectively. At June 30, 1997 and 1996,
the accumulated post-retirement benefit obligation related to these agreements
was $5,961,000 and $6,206,000, respectively, and the projected benefit
obligation was $9,839,000 and $9,442,000, respectively. A prepaid
post-retirement benefit asset of $499,000 was recorded at June 30, 1997, and an
accrued post-retirement benefit liability of $464,000 was recorded at June 30,
1996.

In addition to providing pension benefits, the Company provides certain
post-retirement health care and life insurance benefits. Substantially all of
the Company's employees may become eligible for such benefits if they reach
normal retirement age while working for the Company. While the Company has not
adopted a formal funding policy, all of its accrued post-retirement liability
was funded at year-end. The expense for salaried employees for the years ended
September 30, 1997, 1996, and 1995 was $2,221,000, $1,984,000, and $2,271,000,
respectively. The expense for union employees was $4,204,000, $4,076,000, and
$3,613,000 during 1997, 1996 and 1995, respectively. The "projected unit credit"
actuarial method was used to determine the normal cost and actuarial liability.

A reconciliation of the estimated status of the obligation is as follows:

<TABLE>
<CAPTION>
- -----------------------------------------------------------------------------------------------------------------------------
As of June 30, (in thousands)                                        Salaried Employees   Union Employees
- -----------------------------------------------------------------------------------------------------------------------------
                                                                1997             1996              1997              1996
                                                                ----             ----              ----              ----
<S>                                                         <C>              <C>               <C>               <C>   
Retirees.............................................       $    (9,590)     $   (10,344)      $   (14,529)      $   (14,982)
Active, fully eligible...............................            (2,121)          (1,574)           (4,340)           (4,011)
Other active.........................................            (8,309)          (7,989)          (14,151)          (14,415)
- ------------------------------------------------------------------------------------------ ---------------------------------
Accumulated post-retirement benefit obligation.......           (20,020)         (19,907)          (33,020)          (33,408)
Fair value of plan assets, primarily equity and
   fixed income securities...........................            23,719           17,519            13,363             8,399
Unamortized amounts..................................            (4,686)           1,210            17,405            23,394
- ----------------------------------------------------------------------------------------------------------------------------
Accrued post-retirement benefit liability............       $      (987)     $    (1,178)     $     (2,252)      $    (1,615)
- ----------------------------------------------------------------------------------------------------------------------------
</TABLE>









                                                                             39


<PAGE>   20




Net periodic post-retirement benefit expense for the years ended September 30,
1997, 1996, and 1995 included the following:

<TABLE>
<CAPTION>
- -----------------------------------------------------------------------------------------------------------------------------
For the years ended September 30, (in thousands)          Salaried Employees                       Union Employees
- -----------------------------------------------------------------------------------------------------------------------------
                                                   1997          1996         1995         1997         1996         1995
                                                   ----          ----         ----         ----         ----         ----
<S>                                              <C>          <C>          <C>          <C>          <C>           <C>
Service cost                                     $     979    $     516    $     512    $   1,198    $     876     $    807
Interest cost on accumulated post-retirement
   benefit obligation                                2,204        1,679        1,696        2,542        2,195        1,793
Amortization of transition obligation                  723          723          723        1,285        1,285        1,285
Amortization of actuarial gains and losses            (568)        (277)          --           --           --           --
Deferred asset (gain) loss                           3,682          658          539        2,006          177          424
Actual (return) on plan assets                      (4,799)      (1,315)      (1,199)      (2,827)        (457)        (696)
- ---------------------------------------------------------------------------------------------------------------------------
Net periodic post-retirement benefit expense     $   2,221    $   1,984    $   2,271    $   4,204    $   4,076     $  3,613
- ---------------------------------------------------------------------------------------------------------------------------
</TABLE>



The weighted average discount rate used in determining the accumulated
post-retirement benefit obligation was 7.75 percent in 1997 and 1996. The
expected long-term rate of return on assets is 8.25 percent for both years, and
the tax rate on investment income is assumed to be 40 percent. The weighted
average health care cost trend rate used in determining the accumulated
post-retirement benefit obligation was 8.25 percent and 8 percent in 1997 and
1996, respectively. That assumption has a significant effect on the amounts
reported. For example, with respect to salaried employees, increasing the
weighted average health care cost trend rate by 1 percent would increase the
accumulated post-retirement benefit obligation by 2.4 percent and the net
periodic post-retirement benefit cost by 2.2 percent. For union employees,
increasing the weighted average health care cost trend rate by 1 percent would
increase the accumulated post-retirement benefit obligation by 7.5 percent and
the net periodic post-retirement benefit cost by 7.2 percent. For pay-related
life insurance benefits, the salary scale averages 5.75 percent and 5 percent
in 1997 and 1996, respectively.

For both defined benefit plans and other post-retirement plans, certain
financial assumptions are used in determining the Company's projected benefit
obligation. These assumptions are examined periodically by the Company and any
required changes are reflected in the subsequent determination of projected
benefit obligations.

The Company has a long-term disability plan covering most salaried employees.
Expense for the years ended September 30, 1997, 1996, and 1995 was $163,000,
$370,000, and $155,000, respectively.

6. COMMON STOCK PLANS
A majority of Company employees are eligible to participate in the Energen
Employee Savings Plan (ESP) by investing a portion of their compensation in the
Plan, with the Company matching a part of the employee investment by
contributing Company common stock (new issue or treasury shares) or funds for
the purchase of Company common stock. The ESP also contains employee stock
ownership plan provisions. At September 30, 1997, 198,227 common shares were
reserved for issuance under the ESP. Expense associated with Company
contributions to the ESP was $3,083,000, $2,902,000, and $2,944,000 for 1997,
1996 and 1995, respectively.

In 1992 the Company adopted the Energen Corporation 1992 Long-Range Performance
Plan which provides for the award of up to 500,000 performance units, with each
unit equal to the market value of one share of common stock, to eligible
employees based on predetermined performance criteria at the end of a four-year
award period. Under the Plan, a portion of the performance units is payable
with Company common stock; accordingly, 350,000 shares have been reserved for
issuance. Under the Plan, 60,330, 62,630, and 56,430 performance units were
awarded in 1997, 1996 and 1995, respectively, leaving 188,395 performance units
available for award at September 30, 1997. The Company recorded expense of
$2,632,200, $1,223,000, and $1,628,000 for 1997,1996, and 1995, respectively,
under the Plan.

In 1996, the Company amended its Dividend Reinvestment and Common Stock
Purchase Plan to include a direct stock purchase feature which allows purchases
by non-shareholders. Accordingly, 750,000 shares were added to the Plan. As of
September 30, 1997, 710,106 common shares were reserved under this Plan.

40


<PAGE>   21

The Energen Corporation 1988 Stock Option Plan provides for the grant of
incentive stock options, non-qualified stock options, or a combination thereof
to officers and key employees. Options granted under the Plan provide for
purchase of the Company's common stock at not less than the fair market value
on the date the option is granted. Under the Plan, 270,000 shares of the
Company's common stock have been reserved for issuance. Options were granted in
1996 and 1995 with dividend equivalents. All outstanding options are
non-qualified and expire 10 years from the date of grant. Transactions under
the Plan are summarized as follows:

<TABLE>
<CAPTION>
- ---------------------------------------------------------------------------------------------------------
As of September 30,                                                       1997        1996        1995
- ---------------------------------------------------------------------------------------------------------
<S>                                                                     <C>         <C>         <C>
Outstanding at beginning of year ($16.75 - $22.125)                     162,056     152,056     141,556
Granted (at $20.125 - $30)...........................                    53,000      10,000      10,500
Exercised (at $18.375)...............................                    (3,500)         --          --
- -------------------------------------------------------------------------------------------------------
Outstanding at year-end..............................                   211,556     162,056     152,056
- -------------------------------------------------------------------------------------------------------
Exercisable at year-end..............................                   211,556     162,056     152,056
- -------------------------------------------------------------------------------------------------------
Remaining reserved for issuance at year-end..........                    40,348      93,348     103,348
- -------------------------------------------------------------------------------------------------------
</TABLE>


The Company has adopted the disclosure-only provisions of SFAS No. 123,
Accounting for Stock-Based Compensation. Accordingly, no compensation expense
has been recognized for its nonqualified stock options. Had compensation cost
for those options been determined in accordance with SFAS No. 123, the
Company's net income and earnings per share would have been $28.9 million, or
$2.30 per share, in 1997 and $21.5 million, or $1.95 per share, in 1996. 

In 1992 the Company adopted the Energen Corporation 1992 Directors Stock Plan
to enable the Company to pay part of the compensation of its non-employee
directors in shares of the Company's common stock. Under the Plan, 3,062,
4,322, and 3,829 shares were issued in 1997, 1996 and 1995, respectively,
leaving 82,210 shares reserved for issuance at September 30, 1997.

The Company has adopted a Shareholder Rights Plan intended to protect
shareholders from coercive or unfair takeover tactics. Under certain
circumstances, shareholders have the right to acquire the Company's Series A
Junior Participating Preferred Stock (or, in certain cases, securities of an
acquiring person) at a significant discount. Terms and conditions are set forth
in a Rights Agreement (dated July 27, 1988, and amended February 28, 1990)
between the Company and its Rights Agent. Under the plan, two-thirds of a right
is associated with each outstanding share of Common Stock. Rights outstanding
under the Shareholder Rights Plan at September 30, 1997 and 1996, were
convertible into 95,987 and 74,418 shares, respectively, of Series A Junior
Participating Preferred Stock (1/100 share of preferred stock for each full
right) subject to adjustment upon occurrence of certain take-over related
events. No rights were exercised or exercisable at either period. The price at
which the rights would be exercised is $80 per right, subject to adjustment
upon occurrence of certain take-over related events. In general, absent certain
takeover- related events as described in the Plan, the rights may be redeemed
prior to the July 27, 1998, expiration for $0.02 per right.

7. COMMITMENTS AND CONTINGENCIES
CONTRACTS AND AGREEMENTS: The Company has various firm gas supply and firm gas
transportation contracts which expire at various dates through the year 2008.
These contracts typically contain minimum demand charge obligations on the part
of the Company.

During 1996, Taurus entered into a sales contract providing for variable and
fixed prices with a fixed price of $2.02 per Mcf for certain of its 1998
production. Taurus's net production of approximately 4 Bcf is subject to the
fixed price. Taurus has an agreement with Sonat Exploration Company under which
it has the option to acquire an interest in any properties purchased by that
company under its reserve acquisition program. No significant Sonat joint
venture acquisitions were made in fiscal 1997. The agreement will expire at the
end of calendar year 1998.

ENVIRONMENTAL MATTERS: Alagasco is in the chain of title of eight former
manufactured gas plant sites, of which it still owns four, and five
manufactured gas distribution sites, of which it still owns one. A preliminary
investigation of the sites does not indicate the present need for remediation
activities. Management expects that, should remediation of any such sites be
required in the future, Alagasco's share, if any, of such costs will not
materially affect the results of operations or financial condition of Alagasco.

Taurus is subject to various environmental regulations. Management believes
that Taurus is in compliance with the currently applicable standards of the
environmental agencies to which it is subject and that potential environmental
liabilities, if any, are minimal. Also, to the extent Taurus has operating
agreements with various joint venture partners, environmental costs, if any,
would be shared proportionately.

LEGAL MATTERS: Energen and its affiliates are, from time to time, parties to
various pending or threatened legal proceedings. Certain of these lawsuits
include claims for punitive damages in addition to other specified relief.
Based upon information presently available, and in light of available legal and
other defenses, contingent liabilities arising from threatened and pending
litigation

                                                                             41
<PAGE>   22
are not considered material in relation to the respective financial positions
of Energen and its affiliates. It should be noted, however, that Energen and
its affiliates conduct business in Alabama and other jurisdictions in which the
magnitude and frequency of punitive damage awards bearing little or no relation
to culpability or actual damages continue to rise making it increasingly
difficult to predict litigation results. Various legal proceedings arising in
the normal course of business are currently in progress and the Company has
accrued a provision for estimated costs.

LEASE OBLIGATIONS: Total payments related to leases included as operating
expense were $3,987,000, $3,050,000, and $3,035,000 in 1997, 1996 and 1995,
respectively. Minimum future rental payments (in thousands) required after 1997
under leases with initial or remaining noncancelable lease terms in excess of
one year are as follows:

<TABLE>
<CAPTION>
- -----------------------------------------------------------------------------------------------------------------------------
           1998                1999              2000               2001                 2002             2003 and thereafter
- -----------------------------------------------------------------------------------------------------------------------------
        <S>                 <C>               <C>                 <C>                 <C>                 <C>
        $   3,531           $   1,567         $   1,117           $    672            $      94             $     25
- -----------------------------------------------------------------------------------------------------------------------------
</TABLE>


8. SUPPLEMENTAL CASH FLOW INFORMATION
Supplemental information concerning cash flow activities is as follows:

<TABLE>
<CAPTION>
- --------------------------------------------------------------------------------------------------------------
For the years ended September 30, (in thousands)                   1997             1996              1995
- --------------------------------------------------------------------------------------------------------------
<S>                                                           <C>               <C>               <C>
Interest paid........................................         $    18,385       $    13,261       $   13,994
Income taxes paid....................................         $     6,308       $     5,486       $    6,234
Noncash investing activities
   Capitalized depreciation..........................         $       168       $       166       $      166
   Allowance for funds used during construction......         $       490       $       972       $    1,054
Noncash financing activities (debt issuance costs)            $       585       $       414       $      340
- --------------------------------------------------------------------------------------------------------------
</TABLE>



9. FINANCIAL INSTRUMENTS AND RISK MANAGEMENT
FINANCIAL INSTRUMENTS: The fair value of cash and cash equivalents, trade
receivables (net of allowance), and short-term debt approximates fair value due
to the short maturity of the instruments. The fair value of fixed-rate
long-term debt, including the current portion, with a carrying value of
$281,457,000, would be $287,121,000 at September 30, 1997. The fair value was
based on the market value of debt with similar maturities and with interest
rates currently trading in the marketplace.

The Company has entered into an agreement with a financial institution whereby
it can sell on an ongoing basis, with recourse, certain installment receivables
related to its merchandising program up to a maximum of $20 million. During
1997, 1996 and 1995 , the Company sold $7,926,000, $8,831,000 and $8,454,000 ,
respectively, of installment receivables. At September 30, 1997 and 1996, the
balance of these installment receivables was $17,160,000 and $16,964,000,
respectively. Receivables sold under this agreement are considered financial
instruments with off-balance sheet risk. The Company's exposure to credit loss
in the event of non-performance by customers is represented by the balance of
installment receivables.

PRICE RISK: Taurus periodically enters into derivative commodity instruments to
hedge its exposure to price fluctuations on oil and gas production. Such
instruments include regulated natural gas and crude oil futures contracts
traded on the New York Mercantile Exchange and over-the-counter swaps and basis
hedges with major energy derivative product specialists. These transactions are
accounted for under the hedge method of accounting. Under this method, any
unrealized gains and losses are recorded as a current receivable/payable and a
deferred gain/loss. Realized gains and losses are deferred until the revenues
from the related hedged volumes are recognized in the income statement. These
realized deferred gains and losses are reflected in current liabilities or
current assets, respectively. Cash flows from derivative instruments are
recognized as incurred through changes in working capital. At September 30,
1997, the Company had deferred losses on the balance sheet of $12.9 million.

At September 30, 1997, Taurus has entered into contracts and swaps for 36.3 Bcf
of its 1998 flowing gas production at an average contract price of $2.26 per
Mcf and 453 MBbl of its oil production at an average contract price of $20.29
per barrel. The program has been extended into fiscal year 1999 with contracts
and swaps in place for 5.7 Bcf of flowing gas production primarily in the
spring and summer months at an average contract price of $2.16 per Mcf.
Realized prices are anticipated to be lower than hedged prices due to basis
difference and other factors. 

All hedge transactions are subject to the Company's risk management policy,
approved by the Board of Directors, which does not permit speculative
positions. To apply the hedge method of accounting, management must demonstrate
that a high correlation exists between the value of the derivative commodity
instrument and the value of the item hedged. Management uses the historic
relationships between

42

<PAGE>   23



the derivative instruments and the sales prices of the hedged volumes to ensure
that a high level of correlation exists.

CONCENTRATION OF CREDIT RISK: Natural gas distribution operating revenues and
related accounts receivable are generated from state-regulated utility natural
gas sales and transportation to more than 465,000 residential, commercial and
industrial customers located in central and north Alabama. A change in economic
conditions may affect the ability of customers to meet their obligations;
however, the Company believes that its provision for possible losses on
uncollectible accounts receivable is adequate for its credit loss exposure.

Revenues and related accounts receivable from exploration and production
operations are generated primarily from the sale of produced natural gas and
oil. This industry concentration has the potential to impact the Company's
overall exposure to credit risk, either positively or negatively, in that the
customers may be similarly affected by changes in economic, industry, or other
conditions. The Company is not aware of any significant credit risks which have
not been recognized in the provision for doubtful accounts.

10. ACCOUNTING FOR LONG-LIVED ASSETS
During fiscal year 1997, the Company adopted SFAS 121, Accounting for the
Impairment of Long-Lived Assets and for Long-Lived Assets to be Disposed Of.
The Statement requires that an impairment loss be recognized when the carrying
amount of an asset exceeds the sum of the undiscounted estimated future cash
flow of the asset. The Statement also provides that all long-lived assets to be
disposed of be reported at the lower of the carrying amount or fair value.
Accordingly, during the fourth quarter of 1997, the Company recorded a pre-tax
write down of $2.1 million on certain oil and gas properties that are being
held for sale. The properties have 9.7 Bcf of proved undeveloped reserves. The
expense was recorded as additional depreciation, depletion and amortization.

11. RECENT PRONOUNCEMENTS OF THE FASB
In fiscal 1997, the Company adopted SFAS No. 123, Accounting for Stock-Based
Compensation, which establishes a fair value-based method of accounting for
employee stock options. The Statement allows companies to continue to follow
the accounting treatment prescribed by APB Opinion 25 with proper disclosure.
The Company has adopted the disclosure-only provisions of SFAS 123 (see Note
6).

In 1997, the Company adopted SFAS No. 125, Accounting for Transfers and
Servicing of Financial Assets and Extinguishment of Liabilities, which provides
accounting and reporting standards for such transactions. The adoption did not
have a material impact on the consolidated financial statements.

In February 1997, the FASB issued SFAS No. 128, Earnings Per Share, which
specifies computation, presentation, and disclosure requirements for EPS, and
SFAS No. 129, Disclosures of Information about Capital Structure, which
establishes standards for disclosing information about an entity's capital
structure. The Company is required to adopt these Statements in its 1998 fiscal
year. In June 1997, the FASB issued SFAS No. 130, Reporting Comprehensive
Income, which requires the reporting and display of comprehensive income and
its components in an entity's financial statements, and SFAS No. 131,
Disclosures about Segments of an Enterprise and Related Information, which
specifies revised guidelines for determining an entity's operating segments and
the type and level of financial information to be required. The Company is
required to adopt these Statements in fiscal year 1999. The impact of these
pronouncements on the Company is currently being evaluated.

                                                                             43


<PAGE>   24



12. SUMMARIZED QUARTERLY FINANCIAL DATA (Unaudited)
The following data summarize quarterly operating results. The Company's
business is seasonal in character and strongly influenced by weather
conditions.

<TABLE>
<CAPTION>
- -----------------------------------------------------------------------------------------------------------------------------
                                                                                  1997 Fiscal Quarters
(In thousands, except per share amounts)                         First           Second             Third           Fourth
- -----------------------------------------------------------------------------------------------------------------------------
<S>                                                         <C>              <C>               <C>               <C>
Operating revenues...................................       $    97,002      $   182,942       $    90,879       $   77,407
Operating income (loss)..............................       $     7,955      $    41,598       $     8,244       $   (5,811)
Net income (loss)....................................       $     3,177      $    30,531       $     3,007       $   (7,718)
Earnings (loss) per average common share.............       $      0.28      $      2.41       $      0.23       $    (0.58)
- ---------------------------------------------------------------------------------------------------------------------------
                                                                                  1996 Fiscal Quarters
                                                                First            Second            Third            Fourth
- -----------------------------------------------------------------------------------------------------------------------------
Operating revenues...................................       $    78,823      $   170,987       $    87,130       $   62,502
Operating income (loss)..............................       $     4,773      $    33,643       $     4,011       $   (3,630)
Net income (loss)....................................       $     2,278      $    23,430       $     1,071       $   (5,238)
Earnings (loss) per average common share.............       $      0.21      $      2.13       $      0.10       $    (0.47)
- ---------------------------------------------------------------------------------------------------------------------------
</TABLE>



13. OIL AND GAS PRODUCING ACTIVITIES (Unaudited)
The following schedules detail historical financial data of the Company's oil
and gas producing activities. Certain terms appearing in the schedules are
prescribed by the Securities and Exchange Commission (SEC) and are briefly
described as follows:

LEASE ACQUISITION COSTS are costs incurred to lease or otherwise acquire a
property.

EXPLORATION EXPENSES are primarily costs associated with drilling unsuccessful
exploratory wells in undeveloped properties, exploratory geological and
geophysical activities, and costs of impaired leaseholds.

DEVELOPMENT COSTS include costs necessary to gain access to, prepare and equip
development wells in areas of proved reserves.

PRODUCTION (LIFTING) COSTS include costs incurred to operate and maintain
wells.

GROSS REVENUES are reported after deduction of royalty interest payments.

GROSS WELL OR ACRE is a well or acre in which a working interest is owned.

NET WELL OR ACRE is deemed to exist when the sum of fractional ownership
working interests in gross wells or acres equals one.

DRY WELL is an exploratory or a development well found to be incapable of
producing either oil or gas in sufficient quantities to justify completion as
an oil or gas well.

PRODUCTIVE WELL is an exploratory or a development well that is not a dry well.

CAPITALIZED COSTS

<TABLE>
<CAPTION>
- -------------------------------------------------------------------------------------------------------------
As of September 30, (in thousands)                               1997             1996              1995
- -------------------------------------------------------------------------------------------------------------
<S>                                                         <C>               <C>               <C>
Proved...............................................       $   432,095       $   222,428       $  115,720
Unproved.............................................            22,115             2,041            1,619
- -------------------------------------------------------------------------------------------------------------
   Total capitalized costs...........................           454,210           224,469          117,339
Accumulated depreciation, depletion and amortization             87,554            60,152           51,170
- -------------------------------------------------------------------------------------------------------------
Capitalized costs, net...............................       $   366,656       $   164,317       $   66,169
- -------------------------------------------------------------------------------------------------------------
</TABLE>





44


<PAGE>   25



COSTS INCURRED The following table sets forth costs incurred in property
acquisition and exploration and development activities and includes both
capitalized costs and costs charged to expense during the year:

<TABLE>
<CAPTION>
- -----------------------------------------------------------------------------------------------
As of September 30, (in thousands)                            1997         1996         1995
- -----------------------------------------------------------------------------------------------
<S>                                                      <C>          <C>          <C>
Property acquisition:
   Proved............................................    $   171,701  $   108,315  $   16,950
   Unproved..........................................         22,028        1,693         989
Exploration..........................................         14,847       11,124       4,666
Development..........................................         36,375       10,040       6,044
- -----------------------------------------------------------------------------------------------
Total costs incurred.................................    $   244,951  $   131,172  $   28,649
- -----------------------------------------------------------------------------------------------
</TABLE>



RESULTS OF OPERATIONS The following table sets forth results of the Company's
oil and gas producing activities:

<TABLE>
<CAPTION>
- ------------------------------------------------------------------------------------------------
Years ended September 30, (in thousands)                     1997          1996        1995
- ------------------------------------------------------------------------------------------------
<S>                                                     <C>           <C>          <C> 
Gross revenues.......................................   $    84,366   $    38,421  $   22,656
Production (lifting) costs...........................        25,486        10,573       5,995
Exploration expense..................................         6,636         5,439       2,933
Depreciation, depletion and amortization*............        35,393        18,583       8,847
Income tax benefit...................................        (2,299)       (3,004)     (2,410)
- ------------------------------------------------------------------------------------------------
Results of operations from producing activities......   $    19,150   $     6,830  $    7,291
- ------------------------------------------------------------------------------------------------
</TABLE>

*  Includes a write down in 1997 of $2.1 million under SFAS 121 (see Note 10)


AVERAGE SALES PRICE, PRODUCTION COST AND DEPRECIATION RATE

<TABLE>
<CAPTION>
- ----------------------------------------------------------------------------------------------
Years ended September 30,                                 1997          1996          1995
- ----------------------------------------------------------------------------------------------
<S>                                                      <C>          <C>           <C>
Average sales price:
   Gas (per Mcf).....................................    $  2.05      $  1.97       $  1.72
   Oil (per barrel)..................................    $ 18.08      $ 16.25       $ 15.07
   Natural gas liquids (per barrel)..................    $ 11.45      $    --       $    --
Average production (lifting) cost (per Mcf equivalent)   $  0.69      $  0.66       $  0.59
Average depreciation rate (per Mcf equivalent).......    $  0.90      $  1.15       $  0.88
- --------------------------------------------------------------------------------------------
</TABLE>



DRILLING ACTIVITY The following table sets forth the total number of net
productive and dry exploratory and development wells drilled:

<TABLE>
<CAPTION>
- -----------------------------------------------------------------------------------------
Years ended September 30,                                    1997      1996      1995
- -----------------------------------------------------------------------------------------
<S>                                                          <C>       <C>       <C>
Exploratory:
   Productive........................................            1.6     1.1        0.9
   Dry...............................................            1.2     1.5        1.0
- -----------------------------------------------------------------------------------------
   Total.............................................            2.8     2.6        1.9
- -----------------------------------------------------------------------------------------
Development:
   Productive........................................           17.7     2.4        1.0
   Dry...............................................            0.7      --        0.1
- -----------------------------------------------------------------------------------------
   Total.............................................           18.4     2.4        1.1
- -----------------------------------------------------------------------------------------
</TABLE>


As of September 30, 1997, the Company was participating in the drilling of 7
gross wells, with the Company's interest equivalent to 1.3 wells.

                                                                             45


<PAGE>   26



PRODUCTIVE WELLS AND ACREAGE The following table sets forth the total gross and
net productive gas and oil wells as of September 30, 1997, and developed and
undeveloped acreage as of the latest practicable date prior to year-end:

<TABLE>
<CAPTION>
- -------------------------------------------------------------------------------------
                                                            Gross             Net
- -------------------------------------------------------------------------------------
<S>                                                       <C>              <C>
Gas Wells............................................       3,376            1,575
Oil Wells............................................       1,589              199
- -------------------------------------------------------------------------------------
Developed Acreage....................................     946,850          559,566
Undeveloped Acreage..................................     354,110           34,013
- -------------------------------------------------------------------------------------
</TABLE>


All wells and acreage are located in the United States, onshore and offshore,
with the majority of the net undeveloped acreage located in the Gulf Coast
region.

OIL AND GAS PRODUCING ACTIVITIES The calculation of proved reserves are made
pursuant to rules prescribed by the SEC. Such rules, in part, require that only
proved categories of reserves be disclosed and that reserves and associated
values be calculated using current prices and costs. Changes to current prices
and costs might have a significant effect on the disclosed amount of reserves
and their associated values. In addition, the estimation of reserves inherently
requires the use of geologic and engineering estimates which are subject to
revision as reservoirs are produced and developed and as additional information
is learned. Accordingly, the amount of actual future production may vary
significantly from the amount of reserves disclosed. See Note 9 for pricing
information regarding the hedging activities of the Company. Prior to 1997,
natural gas liquid quantities were insignificant and were included in oil
quantities. The proved reserves are located in the United States, both onshore
and offshore, and are as follows:

<TABLE>
<CAPTION>
- -----------------------------------------------------------------------------------------------------------------------------
Years ended September 30,                                1997                           1996                   1995
- -----------------------------------------------------------------------------------------------------------------------------
                                              Gas         Oil          NGL         Gas         Oil         Gas        Oil
                                             MMcf        MBbl         MBbl        MMcf        MBbl        MMcf       MBbl
                                             ----        ----         ----        ----        ----        ----       ----
<S>                                         <C>          <C>         <C>        <C>
Proved reserves at beginning of year        212,977      6,315           --      71,267       3,986      60,057      1,485
Revisions of previous estimates              (2,910)      (110)          --         502         369      (1,462)       142
Purchase of minerals in place               352,373      3,650       12,880     155,647       3,805      11,919      2,472
Discoveries and other additions              11,946         83           --       5,113          49       9,350        137
Production                                  (29,318)      (775)        (502)    (12,308)       (635)     (8,597)      (250)
Sales of minerals in place                     (785)       (35)          --      (7,244)     (1,259)         --         --
- --------------------------------------------------------------------------------------------------------------------------
Proved reserves at end of year              544,283      9,128       12,378     212,977       6,315      71,267      3,986
- --------------------------------------------------------------------------------------------------------------------------
Proved developed reserves at end of year    511,864      8,140       12,378     175,124       5,012      50,657      3,380
- --------------------------------------------------------------------------------------------------------------------------
</TABLE>


During the year, Taurus invested $172 million in property acquisitions and
added 452 Bcfe of proved reserves. Additional development expenditures are
required. Also, Taurus sold approximately 1 Bcfe and recorded a pre-tax gain of
$1 million.

STANDARDIZED MEASURE OF DISCOUNTED FUTURE NET CASH FLOWS RELATING TO PROVED OIL
AND GAS RESERVES The standardized measure of discounted future net cash flows
is not intended, nor should it be interpreted, to present the fair market value
of the Company's crude oil and natural gas reserves. An estimate of fair market
value would take into consideration factors such as, but not limited to, the
recovery of reserves not presently classified as proved reserves, anticipated
future changes in prices and costs, and a discount factor more representative
of the time value of money and the risks inherent in reserve estimates.

<TABLE>
<CAPTION>
- -----------------------------------------------------------------------------------------------------------------------------
Years ended September 30, (in thousands)                                         1997              1996              1995
- -----------------------------------------------------------------------------------------------------------------------------
<S>                                                                          <C>               <C>               <C>
Future gross revenues................................                        $ 1,553,333       $   502,607       $  156,367
Future production costs..............................                            571,732           216,755           63,311
Future development costs.............................                             74,396            40,665           19,029
- ---------------------------------------------------------------------------------------------------------------------------
Future net cash flows before income taxes............                            907,205           245,187           74,027
Future income tax expense (benefit) including tax credits                        162,172             3,707          (10,533)
- ---------------------------------------------------------------------------------------------------------------------------
Future net cash flows after income taxes.............                            745,033           241,480           84,560
Discount at 10% per annum............................                            305,679            70,641           21,001
- ---------------------------------------------------------------------------------------------------------------------------
Standardized measure of discounted future net cash flows
relating to proved oil and gas reserves..............                        $   439,354       $   170,839       $   63,559
- ---------------------------------------------------------------------------------------------------------------------------
</TABLE>


The following are the principal sources of changes in the standardized measure
of discounted future net cash flows:

46


<PAGE>   27


<TABLE>
<CAPTION>
- -----------------------------------------------------------------------------------------------------------------------------
Years ended September 30, (in thousands)                                          1997              1996             1995
- -----------------------------------------------------------------------------------------------------------------------------
<S>                                                                          <C>               <C>               <C>
Balance at beginning of year.........................                        $   170,839       $    63,559       $   51,654
- -----------------------------------------------------------------------------------------------------------------------------
Revisions to reserves proved in prior years:
   Net changes in prices, production costs and future
   development costs.................................                             44,913            15,051            (1,984)
   Net changes due to revisions in quantity estimates                             (7,378)              552            (2,474)
   Development costs incurred, previously estimated                               16,743             6,713             3,207
   Accretion of discount.............................                             17,084             6,356             5,166
   Other.............................................                             (1,599)            1,215               (37)
- ----------------------------------------------------------------------------------------------------------------------------
Total Revisions......................................                             69,763            29,887             3,878
New field discoveries and extensions, net of future
   production and development costs..................                              8,947             4,705             6,021
Sales of oil and gas produced, net of production costs                           (53,848)          (24,002)          (12,518)
Purchases of minerals in place.......................                            259,918            94,728            13,894
Sales of minerals in place...........................                               (625)          (10,597)               --
Net change in income taxes...........................                            (15,640)           12,559               630
- ----------------------------------------------------------------------------------------------------------------------------
Net change in standardized measure of discounted future
   net cash flows....................................                            268,515           107,280            11,905
- ----------------------------------------------------------------------------------------------------------------------------
Balance at end of year...............................                        $   439,354       $   170,839       $    63,559
- ----------------------------------------------------------------------------------------------------------------------------
</TABLE>

COALBED METHANE ACTIVITIES Taurus is actively engaged in the production of
pipeline-quality natural gas from coal (coalbed methane). The results of
coalbed methane activities have been included in the oil and gas disclosures
shown previously. Because of the significance of coalbed methane to Taurus,
certain data are separately disclosed below.

<TABLE>
<CAPTION>
- -----------------------------------------------------------------------------------------------------------------------------
Years ended September 30,                                                                   1997          1996       1995
- -----------------------------------------------------------------------------------------------------------------------------
<S>                                                                                      <C>           <C>       <C>  
Proved reserves at beginning of year (MMcf)..........                                      130,387       25,004    26,712
Revisions of previous estimates......................                                        1,959        4,231     1,842
Purchases of minerals in place.......................                                      107,228      105,762        --
Discoveries and other additions......................                                           --           --       159
Production...........................................                                       (9,251)      (4,610)   (3,709)
- --------------------------------------------------------------------------------------------------------------------------
Proved reserves at end of year.......................                                      230,323      130,387    25,004
- --------------------------------------------------------------------------------------------------------------------------
Estimated proved reserves qualifying for tax credits (MMcf)                                 55,776       30,142    15,837
- --------------------------------------------------------------------------------------------------------------------------
Net capitalized costs (in thousands).................                                    $ 145,686     $ 77,708  $ 19,370
- --------------------------------------------------------------------------------------------------------------------------
Gross wells in which Taurus has working and/or revenue interest                                863          825       634
- --------------------------------------------------------------------------------------------------------------------------
Net productive wells.................................                                        548.4        279.1     154.4
- --------------------------------------------------------------------------------------------------------------------------
</TABLE>


Production of coalbed methane from wells drilled prior to January 1, 1993,
qualifies through December 31, 2002, for federal income tax credits under
Section 29 of the Internal Revenue Code of 1986, as amended. The tax credit
currently approximates $1.05 per Mcf of qualifying production. Accordingly, a
significant portion of the value of proved coalbed methane reserves is
associated with this tax credit.

                                                                            47


<PAGE>   28



14. SUPPLEMENTAL FULL COST ACCOUNTING INFORMATION (UNAUDITED)
There are two methods of financial accounting for oil and gas exploration and
production activities-successful efforts and full cost. As described in Note 1,
the Company uses the successful efforts method which is preferred by the
Financial Accounting Standards Board and is the more conservative method for
companies engaging in exploration activities. However, the full cost method
continues to be used by many companies with exploration activities including a
number of the Company's peers. In response to requests from the investment
community, the Company is providing the following supplemental proforma full
cost information to facilitate making comparisons between the Company and its
full cost peers. The supplemental information is not audited and includes
certain assumptions, described in the following paragraphs, which should be
read in conjunction with the information contained in the table below.

Under the full cost method of accounting, all costs directly incurred in the
acquisition, exploration, and development of oil and gas properties are
capitalized. Such capitalized costs are amortized on a unit-of-production
method based on total proved reserves. The unamortized costs (net of related
deferred income taxes) are subject to a ceiling test in which the excess, if
any, of the amount of the cost center over the value of the ceiling is charged
against income. The cost center ceiling s defined as 1) the present value (10%
discount rate) of estimated future net revenues from proved reserves with such
net revenues based on current prices and current costs, plus 2) the cost of
properties not currently being amortized, minus 3) the income tax effects
related to the difference between items 1 and 2 and the tax basis of the
related assets. Because of the ceiling test, full cost entities are not subject
to the impairment test provisions of SFAS 121 (see Note 10). The SEC has an
informal interpretation that the full cost ceiling test is to be applied
quarterly. Information required to perform such tests as of the end of the
interim periods was unavailable. In the proforma full cost disclosure below,
therefore, the full cost ceiling test was applied on an annual basis.

The Company's oil and gas properties include large amounts of coalbed methane
reserves, a significant portion of the value of which are derived from
nonconventional fuels tax credits (see Note 13). Under SFAS 109, Accounting for
Income Taxes, the full amount of historical tax credits and other tax benefits
has been recognized in the financial statements as it is "more likely than not"
that such benefits will reduce future income taxes. Even though the Company
expects that future tax benefits will continue as assets under the "more likely
than not" criteria of SFAS 109, the full cost ceiling test, which was developed
prior to the issuance of SFAS 109, limits the utilization of future tax
benefits. Therefore, the full cost method would have required write downs
pursuant to the ceiling test rules in some years that otherwise would have been
avoided if the ceiling test rules were consistent with the financial statement
treatment of such tax benefits. Accordingly, the Company is responding to the
requests of certain users of the financial statements by also disclosing
supplemental information referred to as Modified Full Cost to reflect the
proforma inclusion of the value of tax benefits in the full cost ceiling test.
This presentation will provide comparable results to full cost peers while also
giving value to tax attributes of coalbed methane consistent with the treatment
such attributes receive in the basic financial statements prepared under
generally accepted accounting principles. In the following proforma Modified
Full Cost disclosure, the ceiling test was applied on an annual basis, as
described above, and tax credits were discounted using a 10% discount rate on
an as-produced basis.

<TABLE>
<CAPTION>
- ---------------------------------------------------------------------------------------------------------------------------------
(in thousands, except share data)           1997                           1996                             1995
- ---------------------------------------------------------------------------------------------------------------------------------
                                           Full     Modified                  Full      Modified               Full     Modified
                             Successful    Cost     Full Cost Successful      Cost      Full Cost Successful   Cost     Full Cost
                               Efforts  (proforma) (proforma)   Efforts    (proforma)  (proforma)   Efforts (proforma) (proforma)
- ---------------------------------------------------------------------------------------------------------------------------------
<S>                            <C>       <C>       <C>        <C>          <C>        <C>        <C>        <C>        <C>
Income Statement:
   Net income                  $  28,997  $  42,531  $  41,217  $  21,541  $  17,909  $  25,971  $  19,308  $  14,554  $  14,460
   Earnings per share               2.31       3.39       3.28       1.95       1.62       2.36       1.77       1.33       1.33
   Depreciation, depletion and
   amortization                   57,628     42,142     44,164     41,118     34,230     35,787     29,556     27,724     30,211
   Impairment under SFAS 121       2,060         --         --         --         --         --         --         --         --
   Full cost write down               --         --         --         --     13,961         --         --     12,079      9,736
Balance Sheet:
   Oil and gas properties, net   366,656    352,532    388,710    164,317    129,169    167,370     66,169     36,644     62,441
   Shareholders equity           301,143    314,677    313,363    188,405    184,773    192,835    173,924    169,170    169,076
- ---------------------------------------------------------------------------------------------------------------------------------
</TABLE>



48


<PAGE>   29



15. INDUSTRY SEGMENT INFORMATION
The Company is principally engaged in the purchase, distribution and sale of
natural gas in central and north Alabama (natural gas distribution) and the
exploration, production, acquisition and development of oil and gas in the
continental United States (oil and gas exploration and production). Certain
reclassifications have been made to conform the prior year to the current year
presentation.

<TABLE>
<CAPTION>
- -----------------------------------------------------------------------------------------------------------
As of September 30, (in thousands)                                1997              1996             1995
- -----------------------------------------------------------------------------------------------------------
<S>                                                          <C>               <C>               <C>
Operating revenues
   Natural gas distribution..........................        $   362,984       $   357,252       $  295,967
   Oil and gas exploration and production............             85,246            42,190           22,613
- -----------------------------------------------------------------------------------------------------------
     Total...........................................        $   448,230       $   399,442       $  318,580
- -----------------------------------------------------------------------------------------------------------
Operating income (loss)
   Natural gas distribution..........................        $    38,792       $    35,270       $   32,513
   Oil and gas exploration and production............             14,704             4,779              719
   Eliminations and corporate expenses...............             (1,510)           (1,252)          (1,199)
- -----------------------------------------------------------------------------------------------------------
     Total...........................................        $    51,986       $    38,797       $   32,033
- -----------------------------------------------------------------------------------------------------------
Depreciation, depletion and amortization expense
   Natural gas distribution..........................        $    23,486       $    21,269       $   19,370
   Oil and gas exploration and production............             36,202            19,849           10,186
- -----------------------------------------------------------------------------------------------------------
     Total...........................................        $    59,688       $    41,118       $   29,556
- -----------------------------------------------------------------------------------------------------------
Capital expenditures
   Natural gas distribution..........................        $    43,277       $    43,175       $   42,780
   Oil and gas exploration and production............            239,718           126,317           27,352
   Other.............................................                 15                60               28
- -----------------------------------------------------------------------------------------------------------
     Total...........................................        $   283,010       $   169,552       $   70,160
- -----------------------------------------------------------------------------------------------------------
Identifiable assets
   Natural gas distribution..........................        $   390,381       $   373,817       $  335,267
   Oil and gas exploration and production............            440,158           217,700          132,720
   Eliminations and other............................             89,258           (22,107)          (8,903)
- -----------------------------------------------------------------------------------------------------------
   Total.............................................        $   919,797       $   569,410       $  459,084
- -----------------------------------------------------------------------------------------------------------
Property, plant and equipment, net
   Natural gas distribution..........................        $   296,228       $   276,927       $  256,638
   Oil and gas exploration and production............            370,677           167,859           70,518
   Other.............................................                 98               130              108
- -----------------------------------------------------------------------------------------------------------
   Total.............................................        $   667,003       $   444,916       $  327,264
- -----------------------------------------------------------------------------------------------------------
</TABLE>






                                                                             49


<PAGE>   30




MANAGEMENTS RESPONSIBILITY FOR FINANCIAL REPORTING 
The accompanying consolidated financial statements and related notes of Energen
Corporation were prepared by management, which has the primary responsibility
for the integrity of the financial information therein. The statements were
prepared in conformity with generally accepted accounting principles appropriate
in the circumstances and include amounts which are based necessarily on
managements best estimates and judgments. Financial information presented
elsewhere in this report is consistent with the information in the financial
statements.

Management maintains a comprehensive system of internal accounting controls and
relies on the system to discharge its responsibility for the integrity of the
financial statements. This system provides reasonable assurance that corporate
assets are safeguarded and that transactions are recorded in such a manner as
to permit the preparation of reliable financial information. Reasonable
assurance recognizes that the cost of a system of internal accounting controls
should not exceed the related benefits. This system of internal accounting
controls is augmented by written policies and procedures, internal auditing,
and the careful selection and training of qualified personnel. As of September
30, 1997, management was aware of no material weaknesses in Energen's system of
internal accounting controls. 

The consolidated financial statements have been audited by the Company's
independent certified public accountants, whose opinion is expressed elsewhere
on this page. Their audit was conducted in accordance with generally accepted
auditing standards; and, in connection therewith, they obtained an
understanding of the Company's system of internal accounting controls and
conducted such tests and related procedures as they deemed necessary to arrive
at an opinion on the fairness of presentation of the consolidated financial
statements.

The functioning of the accounting system and related internal accounting
controls is under the general oversight of the Audit Committee of the Board of
Directors, which is comprised of four outside Directors. The Audit Committee
meets regularly with the independent public accountants and representatives of
management to discuss matters regarding internal accounting controls, auditing
and financial reporting.

Geoffrey C. Ketcham
Executive Vice President,
Chief Financial Officer and
Treasurer

REPORT OF INDEPENDENT CERTIFIED PUBLIC ACCOUNTANTS

To the Shareholders of Energen: We have audited the accompanying consolidated
balance sheets of Energen Corporation and Subsidiaries as of September 30, 1997
and 1996, and the related consolidated statements of income, shareholders
equity and cash flows for each of the three years in the period ended September
30, 1997. These financial statements are the responsibility of the Company's
management. Our responsibility is to express an opinion on these financial
statements based on our audits.

We conducted our audits in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements are free of
material misstatement. An audit includes examining, on a test basis, evidence
supporting the amounts and disclosures in the financial statements. An audit
also includes assessing the accounting principles used and significant
estimates made by management, as well as evaluating the overall financial
statement presentation. We believe that our audits provide a reasonable basis
for our opinion.

In our opinion, the financial statements referred to above present fairly, in
all material respects, the consolidated financial position of Energen
Corporation and Subsidiaries as of September 30, 1997 and 1996, and the
consolidated results of their operations and cash flows for each of the three
years in the period ended September 30, 1997, in conformity with generally
accepted accounting principles.

Coopers & Lybrand L.L.P.
Birmingham, Alabama
October 23, 1997

50


<PAGE>   31



SELECTED FINANCIAL AND COMMON STOCK DATA

<TABLE>
<CAPTION>
Energen Corporation
- -----------------------------------------------------------------------------------------------------------------------------
Years ended September 30,
(dollars in thousands, except per share amounts)                1997             1996              1995              1994
- -----------------------------------------------------------------------------------------------------------------------------
<S>                                                         <C>              <C>               <C>               <C>
INCOME STATEMENT
Operating revenues...................................       $ 448,230      $  399,442       $ 318,580       $ 374,503
Income before cumulative effect of change
   in accounting principle...........................       $  28,997      $   21,541       $  19,308       $  23,751
Net income...........................................       $  28,997      $   21,541       $  19,308       $  23,751
Earnings per share before cumulative effect..........       $   2.31       $     1.95       $   1.77        $   2.19
Earnings per average common share....................       $   2.31       $     1.95       $   1.77        $   2.19
- -----------------------------------------------------------------------------------------------------------------------------
BALANCE SHEET Capitalization at year-end:
   Common shareholders equity........................       $ 301,143      $  188,405       $ 173,924       $ 167,026
   Preferred stock...................................              --             --              --              --
   Long-term debt....................................         279,602         195,545         131,600         118,302
- -----------------------------------------------------------------------------------------------------------------------------
   Total capitalization..............................       $ 580,745      $  383,950       $ 305,524       $ 285,328
- -----------------------------------------------------------------------------------------------------------------------------
Total assets.........................................       $ 919,797      $  569,410       $ 459,084       $ 411,314
- -----------------------------------------------------------------------------------------------------------------------------
Property, plant and equipment, net...................       $ 667,003      $  444,916       $ 327,264       $ 287,182
- -----------------------------------------------------------------------------------------------------------------------------
COMMON STOCK DATA
Annual dividend rate at year-end.....................       $    1.24      $     1.20       $    1.16       $    1.12
Cash dividends paid per common share.................       $    1.21      $     1.17       $    1.13       $    1.09
Book value per common share..........................       $   20.92      $    16.88       $   15.94       $   15.30
Market-to-book ratio at year-end (%).................             170             142             136             147
Yield at year-end (%)................................             3.5             5.0             5.3             5.0
Return on average common equity (%)..................            11.9            11.6            11.0            14.6
Price-to-earnings ratio at year-end..................           15.40            12.3            12.3            10.3
Shares outstanding at year-end (000).................          14,398          11,163          10,910          10,918
Price Range:
   High..............................................       $      37 3/4  $       25 3/8   $      23 1/2   $      26 5/8
   Low...............................................       $      23 3/4  $       21 3/8   $      19 3/4   $      19 1/4
   Close.............................................       $      35 9/16 $       24       $      21 3/4   $      22 1/2
- -----------------------------------------------------------------------------------------------------------------------------
</TABLE>




Note:  All information prior to 1989 has been adjusted for the effects of a 
       three-for-two common stock split.
       All information prior to 1990 includes the effects of discontinued 
       operations.


<PAGE>   32




<TABLE>
<CAPTION>
- -------------------------------------------------------------------------------------------------------------
         1993           1992          1991           1990          1989          1988             1987
- -------------------------------------------------------------------------------------------------------------
       <S>            <C>           <C>            <C>           <C>            <C>            <C>


       $355,878       $331,065      $324,902       $324,022      $308,604       $353,135       $  332,590

       $ 18,081       $ 15,687      $ 14,112       $ 11,267      $  6,422       $ 11,667       $    8,950
       $ 18,081       $ 16,628      $ 14,112       $ 11,267      $  6,422       $ 11,667       $    8,950
       $   1.77       $   1.54      $   1.42       $  1.15       $    .69       $   1.53       $     1.38
       $   1.77       $   1.64      $   1.42       $  1.15       $    .69       $   1.53       $     1.38
- -------------------------------------------------------------------------------------------------------------


       $140,313       $129,858      $121,995       $113,316      $107,950       $ 86,256       $   63,687
                         1,800         1,800          1,800         2,450          2,450            2,850
         85,852         90,609        77,677         82,835        86,188         53,203           54,589
- -------------------------------------------------------------------------------------------------------------
       $226,165       $222,267      $201,472       $197,951      $196,588       $141,909       $  121,126
- -------------------------------------------------------------------------------------------------------------
       $370,685       $342,119      $337,516       $326,350      $294,614       $260,560       $  237,445
- -------------------------------------------------------------------------------------------------------------
       $273,097       $254,630      $273,539       $250,983      $238,329       $206,230       $  191,099
- -------------------------------------------------------------------------------------------------------------

       $   1.08       $   1.04      $   1.00       $    .94      $    .88       $   .827       $      .76
       $   1.05       $   1.01      $   .955       $   .895      $   .843       $   .777       $      .73
       $  13.60       $  12.75      $  12.07       $  11.48      $  11.13       $  10.80       $     9.73
            182            142           150            157           190            147              163
            4.4            5.7           5.5            5.2           4.2            5.2              4.8
           13.0           13.0          11.6           10.0           6.0           15.6             14.7
           14.0           11.1          12.8           15.7          30.6           10.4             11.5
         10,320         10,183        10,104          9,872         9,695          7,989            6,544
       $     26 3/4   $     18 7/8  $     20       $     21 1/2  $     24 3/8   $     16 1/4   $       16 1/2
       $     17 5/8   $     15      $     16       $     16      $     15 3/8   $     11 3/8   $       12 1/2
       $     24 3/4   $     18 1/8  $     18 1/8   $     18      $     21 1/8   $     15 3/8   $       15 7/8
- -------------------------------------------------------------------------------------------------------------
</TABLE>








<PAGE>   33



SELECTED BUSINESS SEGMENT DATA

<TABLE>
<CAPTION>
Energen Corporation
- -----------------------------------------------------------------------------------------------------------------------------
Years ended September 30,
( dollars in thousands)                                         1997             1996              1995              1994
- -----------------------------------------------------------------------------------------------------------------------------
<S>                                                         <C>              <C>               <C>               <C>
NATURAL GAS DISTRIBUTION
Operating revenues
   Residential.......................................       $   237,022      $   236,583       $   194,089       $  229,019
   Commercial and industrialsmall....................            87,477           87,912            68,409           84,443
   Commercial and industriallarge....................                --               --               290              790
   Transportation....................................            33,080           30,408            30,490           29,321
   Other.............................................             5,405            2,349             2,687            1,064
- -----------------------------------------------------------------------------------------------------------------------------
     Total...........................................       $   362,984      $   357,252       $   295,965       $  344,637
- -----------------------------------------------------------------------------------------------------------------------------
Gas delivery volumes
   Residential.......................................            28,357           34,963            27,489           31,254
   Commercial and industrialsmall....................            12,554           15,002            12,289           13,536
   Commercial and industriallarge....................                --               --                29              106
   Transportation....................................            65,622           61,458            61,640           52,635
- -----------------------------------------------------------------------------------------------------------------------------
     Total...........................................           106,533          111,423           101,447           97,531
- -----------------------------------------------------------------------------------------------------------------------------
Average number of customers
   Residential.......................................           422,878          418,486           410,515          402,531
   Commercial and industrialsmall....................            34,430           34,028            33,115           32,563
   Commercial and industriallarge....................                55               54                48               43
- -----------------------------------------------------------------------------------------------------------------------------
     Total...........................................           457,363          452,568           443,678          435,137
- -----------------------------------------------------------------------------------------------------------------------------
Other data
   Depreciation & amortization.......................       $    23,486      $    21,269       $    19,368       $   17,941
   Capital expenditures..............................       $    43,277      $    43,175       $    42,780       $   38,473
   Operating income..................................       $    38,792      $    35,270       $    32,513       $   30,017
- -----------------------------------------------------------------------------------------------------------------------------
OIL AND GAS EXPLORATION & PRODUCTION
Operating revenues
   Natural gas.......................................       $    60,228      $    24,262       $    14,748       $   17,292
   Oil...............................................            19,753           10,313             3,765            2,725
   Other.............................................             5,265            7,615             4,100            3,546
- -----------------------------------------------------------------------------------------------------------------------------
   Total.............................................       $    85,246      $    42,190       $    22,613       $   23,563
- -----------------------------------------------------------------------------------------------------------------------------
Production volumes
   Natural gas (Mcf).................................            29,318           12,308             8,597            9,169
   Oil (MBbl)........................................               775              635               250              191
   Natural gas liquids (MBbl)........................               502               --                --               --
- -----------------------------------------------------------------------------------------------------------------------------
Proved reserves
   Natural gas (MMcf)................................           544,283          212,977            71,267           60,057
   Oil (MMBbl).......................................             9,128            6,315             3,986            1,485
   Natural gas liquids (MMBbl).......................            12,378               --                --               --
- -----------------------------------------------------------------------------------------------------------------------------
</TABLE>




<PAGE>   34




<TABLE>
<CAPTION>
- -----------------------------------------------------------------------------------------------------------------------------
           1993              1992              1991             1990              1989             1988              1987
- -----------------------------------------------------------------------------------------------------------------------------
       <S>               <C>              <C>               <C>              <C>               <C>               <C>     



       $   216,587       $   198,676      $   195,250       $   188,168      $   170,302       $   190,836       $  181,007
            83,069            78,799           84,260            85,588           85,477           104,420           93,242
             1,223             6,501            8,916            13,596           25,000            37,923           24,982
            27,382            25,089           22,890            22,734           19,574            15,158           17,871
             2,299             1,661           (2,188)              873              731               689              679
- ---------------------------------------------------------------------------------------------------------------------------
       $   330,560       $   310,726      $   309,128       $   310,959      $   301,084       $   349,026       $  317,781
- ---------------------------------------------------------------------------------------------------------------------------

            30,957            29,119           26,262            28,653           27,210            28,636           27,365
            13,853            13,860           14,837            16,581           17,946            21,806           18,482
               282             2,654            3,411             4,786            9,494            13,026            8,902
            49,346            46,235           41,447            39,117           34,447            28,730           26,895
- ---------------------------------------------------------------------------------------------------------------------------
            94,438            91,868           85,957            89,137           89,097            92,198           81,644
- ---------------------------------------------------------------------------------------------------------------------------


           395,057           387,871          382,747           379,362          365,572           358,872          350,712
            32,269            31,732           31,432            31,565           30,492            29,717           29,007
                46                41               39                42               42                37               34
- ---------------------------------------------------------------------------------------------------------------------------
           427,372           419,644          414,218           410,969          396,106           388,626          379,753
- ---------------------------------------------------------------------------------------------------------------------------


       $    17,206       $    17,154      $    17,126       $    16,131      $    14,657       $    13,642       $   12,135
       $    22,107       $    20,228      $    19,565       $    19,565      $    39,156       $    25,614       $   30,833
       $    26,381       $    25,915      $    25,209       $    21,080      $    18,548       $    19,666       $   16,838
- ---------------------------------------------------------------------------------------------------------------------------


       $    11,449       $    10,364      $     9,889       $    11,121      $    11,735       $    11,344       $    7,274
             3,484             2,559            1,839             1,411            1,468             1,458            1,948
             2,753               (44)          (3,203)           (5,927)          (8,286)           (8,693)          (3,413)
- ---------------------------------------------------------------------------------------------------------------------------
       $    17,686       $    12,879      $     8,525       $     6,605      $     4,917       $     4,109       $    5,809
- ---------------------------------------------------------------------------------------------------------------------------


             6,245             6,415            5,927             4,954            4,964             4,976            3,207
               204               145               88                80               95                94              128
                --                --               --                --               --                 --              --
- ---------------------------------------------------------------------------------------------------------------------------


            67,298            51,329           73,279            57,532           29,860            14,803           16,497
             1,289               338              402               330              264               292              323
                --                --               --                --                --              --                --
- ---------------------------------------------------------------------------------------------------------------------------
</TABLE>


<PAGE>   1
                                                                      EXHIBIT 21


                       SUBSIDIARIES OF ENERGEN CORPORATION



                             Alabama Gas Corporation
                            Taurus Exploration, Inc.
                         Taurus Exploration U.S.A., Inc.
                              Basin Pipeline Corp.
                            American Heat Tech, Inc.
                               EGN Services, Inc.
                                Midtown NGV, Inc.


<PAGE>   1



                                                                      EXHIBIT 23


               CONSENT OF INDEPENDENT CERTIFIED PUBLIC ACCOUNTANTS

We consent to the incorporation by reference in the registration statements of
Energen Corporation on Forms S-8 and S-3 (File No. 2-89855), Form S-3 (File No.
333-00395), Form S-3 (File No. 333-11239) and Forms S-8 (File No. 33-27869, File
No. 33-46641, File No. 33-48504, and File No. 33-48505) of our report, dated
October 23, 1997, on our audits of the consolidated financial statements of
Energen Corporation as of September 30, 1997 and 1996, and for the years ended
September 30, 1997, 1996, and 1995, which report is incorporated by reference in
this Annual Report on Form 10-K.




Coopers & Lybrand L.L.P.
Birmingham, Alabama
December 17, 1997




<TABLE> <S> <C>

<ARTICLE> UT
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE FORM 10K
FOR SEPTEMBER 30, 1997, AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH
FINANCIAL STATEMENTS.
</LEGEND>
<CIK> 0000277595
<NAME> ENERGEN CORPORATION 
<MULTIPLIER> 1,000
       
<S>                             <C>
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          SEP-30-1997
<PERIOD-START>                             OCT-01-1996
<PERIOD-END>                               SEP-30-1997
<BOOK-VALUE>                                  PER-BOOK
<TOTAL-NET-UTILITY-PLANT>                      295,881
<OTHER-PROPERTY-AND-INVEST>                    371,122
<TOTAL-CURRENT-ASSETS>                         242,165
<TOTAL-DEFERRED-CHARGES>                         9,485
<OTHER-ASSETS>                                       0
<TOTAL-ASSETS>                                 919,797
<COMMON>                                           144
<CAPITAL-SURPLUS-PAID-IN>                      188,643
<RETAINED-EARNINGS>                            112,356
<TOTAL-COMMON-STOCKHOLDERS-EQ>                 301,143
                                0
                                          0
<LONG-TERM-DEBT-NET>                           279,602
<SHORT-TERM-NOTES>                             202,000
<LONG-TERM-NOTES-PAYABLE>                            0
<COMMERCIAL-PAPER-OBLIGATIONS>                       0
<LONG-TERM-DEBT-CURRENT-PORT>                    1,855
                            0
<CAPITAL-LEASE-OBLIGATIONS>                          0
<LEASES-CURRENT>                                     0
<OTHER-ITEMS-CAPITAL-AND-LIAB>                 135,197
<TOT-CAPITALIZATION-AND-LIAB>                  919,797
<GROSS-OPERATING-REVENUE>                      448,230
<INCOME-TAX-EXPENSE>                             3,097
<OTHER-OPERATING-EXPENSES>                     396,244
<TOTAL-OPERATING-EXPENSES>                     399,341
<OPERATING-INCOME-LOSS>                         48,889
<OTHER-INCOME-NET>                               3,014
<INCOME-BEFORE-INTEREST-EXPEN>                  51,903
<TOTAL-INTEREST-EXPENSE>                        22,906
<NET-INCOME>                                    28,997
                          0
<EARNINGS-AVAILABLE-FOR-COMM>                   28,997
<COMMON-STOCK-DIVIDENDS>                        15,299
<TOTAL-INTEREST-ON-BONDS>                       14,250
<CASH-FLOW-OPERATIONS>                          66,782
<EPS-PRIMARY>                                     2.31
<EPS-DILUTED>                                     2.31
        

</TABLE>

<TABLE> <S> <C>

<ARTICLE> UT
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE FORM 10K
FOR SEPTEMBER 1997, AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH
FINANCIAL STATEMENTS.
</LEGEND>
<CIK> 0000003146
<NAME> ALABAMA GAS CORPORATION 
<MULTIPLIER> 1,000
       
<S>                             <C>
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          SEP-30-1997
<PERIOD-START>                             OCT-01-1996
<PERIOD-END>                               SEP-30-1997
<BOOK-VALUE>                                  PER-BOOK
<TOTAL-NET-UTILITY-PLANT>                      295,881
<OTHER-PROPERTY-AND-INVEST>                        347
<TOTAL-CURRENT-ASSETS>                          88,236
<TOTAL-DEFERRED-CHARGES>                         5,917
<OTHER-ASSETS>                                       0
<TOTAL-ASSETS>                                 390,381
<COMMON>                                            20
<CAPITAL-SURPLUS-PAID-IN>                       34,484
<RETAINED-EARNINGS>                            106,894
<TOTAL-COMMON-STOCKHOLDERS-EQ>                 141,398
                                0
                                          0
<LONG-TERM-DEBT-NET>                           125,000
<SHORT-TERM-NOTES>                                   0
<LONG-TERM-NOTES-PAYABLE>                            0
<COMMERCIAL-PAPER-OBLIGATIONS>                       0
<LONG-TERM-DEBT-CURRENT-PORT>                        0
                            0
<CAPITAL-LEASE-OBLIGATIONS>                          0
<LEASES-CURRENT>                                     0
<OTHER-ITEMS-CAPITAL-AND-LIAB>                 123,983
<TOT-CAPITALIZATION-AND-LIAB>                  390,381
<GROSS-OPERATING-REVENUE>                      362,984
<INCOME-TAX-EXPENSE>                            10,118
<OTHER-OPERATING-EXPENSES>                     324,192
<TOTAL-OPERATING-EXPENSES>                     334,310
<OPERATING-INCOME-LOSS>                         28,674
<OTHER-INCOME-NET>                                 701
<INCOME-BEFORE-INTEREST-EXPEN>                  29,375
<TOTAL-INTEREST-EXPENSE>                        10,809
<NET-INCOME>                                    18,570
                          0
<EARNINGS-AVAILABLE-FOR-COMM>                   18,570
<COMMON-STOCK-DIVIDENDS>                         6,720
<TOTAL-INTEREST-ON-BONDS>                        8,765
<CASH-FLOW-OPERATIONS>                          26,076
<EPS-PRIMARY>                                        0
<EPS-DILUTED>                                        0<F1>
<FN>
<F1>EARNINGS PER SHARE IS CALCULATED FOR ENERGEN CORPORATION (PARENT COMPANY OF
ALABAMA GAS CORPORATION) AND IS NOT CALCULATED FOR ALABAMA GAS CORPORATION
SEPARATELY AS AMOUNT WOULD NOT BE MEANINGFUL.
</FN>
        

</TABLE>


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