EL PASO ENERGY CORP/DE
8-K/A, 1999-04-30
NATURAL GAS TRANSMISSION
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<PAGE>   1
================================================================================

                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549


                                   FORM 8-K/A

                               AMENDMENT NO. 1 to

                                 CURRENT REPORT

     PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934


                          Date of Report: April 30, 1999

               (Date of earliest event reported: March 13, 1999)


                           EL PASO ENERGY CORPORATION
             (Exact name of registrant as specified in its charter)



        DELAWARE                   1-14365                      76-0568816
(State or other jurisdiction  (Commission File No.)         (I.R.S. Employer
   of incorporation)                                        Identification No.)



                             EL PASO ENERGY BUILDING
                              1001 LOUISIANA STREET
                              HOUSTON, TEXAS 77002
               (Address of principal executive offices) (Zip Code)


       Registrant's telephone number, including area code: (713) 420-2131

================================================================================
<PAGE>   2
ITEM 5.       OTHER EVENTS.

         This Amendment No. 1 to Current Report on Form 8-K amends the Current
Report on Form 8-K filed by El Paso Energy Corporation on April 23, 1999 to
reflect changes to the pro forma financial information included therein and to
include historical financial statements of Sonat Inc.             

ITEM 7.      FINANCIAL STATEMENTS AND EXHIBITS 

               (a) Financial statements of business acquired.



<PAGE>   3


Report of Ernst & Young LLP, Independent Auditors
Sonat Inc. and Subsidiaries

The Board of Directors and Stockholders
Sonat Inc.

We have audited the accompanying consolidated balance sheets of Sonat Inc. and
Subsidiaries as of December 31, 1998 and 1997, and the related consolidated
statements of operations, changes in stockholders' equity and cash flows for
each of the three years in the period ended December 31, 1998. 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 did not audit the 1996 financial statements of Zilkha Energy
Company, a wholly owned subsidiary, which statements reflect net income
constituting approximately 17 percent of the related consolidated totals. Those
statements were audited by other auditors whose report has been furnished to us,
and our opinion, insofar as it relates to data included for Zilkha Energy
Company, is based solely on the report of the other auditors.

         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 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, based on our audits and, for 1996, the report of other
auditors, the consolidated financial statements referred to above present
fairly, in all material respects, the consolidated financial position of Sonat
Inc. and Subsidiaries at December 31, 1998 and 1997, and the consolidated
results of their operations and their cash flows for each of the three years in
the period ended December 31, 1998, in conformity with generally accepted
accounting principles.

         As discussed in Note 2 to the consolidated financial statements, in
1998 the Company changed its method of accounting for oil and gas operations.



                                              /s/ Ernst & Young LLP


Birmingham, Alabama
January 19, 1999


                                       2

<PAGE>   4
Consolidated Balance Sheets
Consolidated Financial Statements
Sonat Inc. and Subsidiaries

<TABLE>
<CAPTION>
                                                    (In Thousands)
                                               ----------------------------
December 31,                                      1998           1997(*)
- ---------------------------------------------------------------------------
<S>                                            <C>             <C>
ASSETS
Current Assets:
  Cash and cash equivalents                    $    7,104      $   27,278
  Restricted cash (Note 1)                             --         115,956
  Notes receivable from affiliates                 50,359              64
  Accounts receivable                             388,075         619,517
  Inventories (Note 5)                             69,093          65,161
  Gas imbalance receivables                         7,673          16,644
  Assets from trading activities (Note 4)         229,801          92,150
  Other                                            48,404          44,037
- ---------------------------------------------------------------------------
   Total Current Assets                           800,509         980,807
- ---------------------------------------------------------------------------


Investments and Advances:
  Unconsolidated affiliates (Note 6)              635,692         495,234
  Other investments                                61,316          58,384
- ---------------------------------------------------------------------------
                                                  697,008         553,618
- ---------------------------------------------------------------------------


Plant, Property and Equipment, including
  $148,615,000 in 1998 and $201,208,000
  in 1997, excluded from full-cost
  amortization base used for oil and
  gas properties (Notes 7 and 14)               8,399,934       7,830,697
Less Accumulated Depreciation,
  Depletion and Amortization                    5,703,767       4,264,917
- ---------------------------------------------------------------------------
                                                2,696,167       3,565,780
- ---------------------------------------------------------------------------

Deferred Charges and Other:
  Assets from trading activities (Note 4)          25,694           9,638
  Other                                           141,716         142,271
- ---------------------------------------------------------------------------
                                                  167,410         151,909
- ---------------------------------------------------------------------------
Total Assets                                   $4,361,094      $5,252,114
===========================================================================
</TABLE>

(*) Restated, See Note 2
See accompanying notes.



                                       3
<PAGE>   5


Consolidated Balance Sheets
Consolidated Financial Statements
Sonat Inc. and Subsidiaries

<TABLE>
<CAPTION>
                                                           (In Thousands)
                                                     ---------------------------
December 31,                                            1998           1997(*)
- --------------------------------------------------------------------------------
<S>                                                  <C>             <C>
LIABILITIES AND STOCKHOLDERS' EQUITY
Current Liabilities:
  Long-term debt due within one year (Note 8)        $  109,835      $   14,508
  Unsecured notes (Note 8)                              720,361         446,721
  Accounts payable                                      401,357         615,322
  Accrued income taxes                                   21,700          18,274
  Accrued interest                                       47,864          37,242
  Accrued long-term compensation                             --          73,799
  Gas imbalance payables                                 11,497          14,320
  Liabilities from trading activities (Note 4)          223,628          85,398
  Other                                                  40,357          75,299
- --------------------------------------------------------------------------------
   Total Current Liabilities                          1,576,599       1,380,883
- --------------------------------------------------------------------------------

Long-Term Debt (Note 8)                               1,099,484       1,235,984
- --------------------------------------------------------------------------------

Deferred Credits and Other:
  Deferred income taxes (Note 9)                        163,964         485,950
  Liabilities from trading activities (Note 4)           12,564           5,014
  Other                                                 179,232         182,507
- --------------------------------------------------------------------------------
                                                        355,760         673,471
- --------------------------------------------------------------------------------

Commitments and Contingencies (Note 10)

Stockholders' Equity:
  Common stock, $1.00 par; 400,000,000 shares
   authorized, 111,387,520 and 111,385,858
   shares issued in 1998 and 1997, respectively
   (Note 11)                                            111,388         111,385
  Other capital                                          68,804          56,401
  Retained earnings                                   1,209,527       1,858,871
- --------------------------------------------------------------------------------
                                                      1,389,719       2,026,657
- --------------------------------------------------------------------------------
  Less treasury stock at cost, 1,345,673
   and 1,438,793 shares in 1998 and
   1997, respectively (Note 11)                          60,468          64,881
- --------------------------------------------------------------------------------
   Total Stockholders' Equity                         1,329,251       1,961,776
- --------------------------------------------------------------------------------
Total Liabilities and Stockholders' Equity           $4,361,094      $5,252,114
================================================================================
</TABLE>


(*) Restated, See Note 2
See accompanying notes.



                                       4
<PAGE>   6


Consolidated Statements of Operations
Consolidated Financial Statements
Sonat Inc. and Subsidiaries

<TABLE>
<CAPTION>
                                                     (In Thousands, Except Per-Share Amounts)
                                                ----------------------------------------------------
Years Ended December 31,                            1998              1997(*)              1996(*)
- ----------------------------------------------------------------------------------------------------
<S>                                             <C>               <C>                  <C>
Revenues (Notes 1 and 13)                       $ 3,709,818       $ 4,372,497          $ 3,203,610
- ----------------------------------------------------------------------------------------------------
Costs and Expenses:
  Natural gas cost                                2,393,027         2,949,766            1,973,147
  Electric power cost                               351,942           224,294               65,699
  Operating and maintenance                         163,386           181,911              155,781
  General and administrative                        117,749           202,754              145,571
  Depreciation, depletion and amortization          349,465           397,955              383,903
  Ceiling test charges (Note 2)                   1,035,178                --                   --
  Restructuring costs (Note 3)                       15,017                --                   --
  Taxes, other than income                           47,418            43,800               47,447
- ----------------------------------------------------------------------------------------------------
                                                  4,473,182         4,000,480            2,771,548
- ----------------------------------------------------------------------------------------------------
Operating Income (Loss)                            (763,364)          372,017              432,062
- ----------------------------------------------------------------------------------------------------
Other Income (Loss), Net:
  Equity in earnings of unconsolidated
    affiliates (Note 6)                              48,777            43,021               34,211
  Minority interest                                   4,082            (4,395)              (4,907)
  Other income, net                                   8,495            10,296                6,525
- ----------------------------------------------------------------------------------------------------
                                                     61,354            48,922               35,829
- ----------------------------------------------------------------------------------------------------
Earnings (Loss) Before Interest and Taxes          (702,010)          420,939              467,891
- ----------------------------------------------------------------------------------------------------
Interest:
  Interest income                                     5,459             4,908                4,874
  Interest expense                                 (136,837)         (109,548)            (101,403)
  Interest capitalized                                5,123             7,448                7,642
- ----------------------------------------------------------------------------------------------------
                                                   (126,255)          (97,192)             (88,887)
- ----------------------------------------------------------------------------------------------------
Income (Loss) Before Income Taxes                  (828,265)          323,747              379,004
Income Tax Expense (Benefit) (Note 9)              (297,748)          105,751              123,164
- ----------------------------------------------------------------------------------------------------
Net Income (Loss)                               $  (530,517)      $   217,996          $   255,840
====================================================================================================
Earnings (Loss) Per Share of Common
  Stock (Note 11)                               $     (4.82)      $      1.98          $      2.32
Earnings (Loss) Per Share of Common
  Stock - Assuming Dilution (Note 11)                 (4.82)             1.95                 2.29
====================================================================================================
Weighted Average Shares Outstanding                 110,020           110,099              110,370
Weighted Average Shares Outstanding
  - Assuming Dilution                               110,020           111,669              111,722
====================================================================================================
Dividends Paid Per Share                        $      1.08       $      1.08          $      1.08
====================================================================================================
</TABLE>


(*) Restated, See Note 2
See accompanying notes.



                                       5

<PAGE>   7


Consolidated Statements of Changes in Stockholders' Equity
Consolidated Financial Statements
Sonat Inc. and Subsidiaries

<TABLE>
<CAPTION>
                                                                                   (In Thousands)
                                                    --------------------------------------------------------------------------------
                                                            1998                        1997(*)                   1996(*)
                                                    --------------------------------------------------------------------------------
Years Ended December 31,                            Shares         Amount        Shares        Amount      Shares       Amount
- ------------------------------------------------------------------------------------------------------------------------------------
<S>                                                 <C>         <C>              <C>        <C>            <C>        <C>
Common Stock, $1.00 Par; 400,000,000
  Shares Authorized (Note 11):
  Balance at beginning of year                      111,385     $  111,385       111,391    $  111,391     111,402    $  111,402
  Issued (canceled)                                       3              3            (6)           (6)        (11)          (11)
- ------------------------------------------------------------------------------------------------------------------------------------
   Balance at end of year                           111,388        111,388       111,385       111,385     111,391       111,391
- ------------------------------------------------------------------------------------------------------------------------------------
Accumulated Other Comprehensive Income:
  Balance at beginning of year                                       3,222                      10,140                     6,614
  Realized net (gains)/losses in value of
   securities (net of tax expense/(benefit)
   of $683,000, $1,216,000, and $(86,000))                          (1,269)                     (2,259)                      160
  Change in unrealized gains (losses)
   on securities, (net of tax expense/
   (benefit) of $(202,000), $(2,509,000),
   and $1,812,000)                                                    (376)                     (4,659)                    3,366
- ------------------------------------------------------------------------------------------------------------------------------------
   Balance at end of year                                            1,577                       3,222                    10,140
- ------------------------------------------------------------------------------------------------------------------------------------
Other Capital:
  Balance at beginning of year                                      53,179                      50,522                    58,643
  Tax benefit from utilization of NOL
    carryforward                                                    11,505                          --                        --
  Other                                                              2,543                       2,657                    (8,121)
- ------------------------------------------------------------------------------------------------------------------------------------
   Balance at end of year                                           67,227                      53,179                    50,522
- ------------------------------------------------------------------------------------------------------------------------------------
Retained Earnings:
  Balance at beginning of year                                   1,858,871                   1,733,653                 1,371,757
  Adjustment to beginning balance for Sonat
   Exploration's change to full cost (Note 2)                           --                          --                   199,196
  Net income (loss)                                               (530,517)                    217,996                   255,840
  Cash dividends paid by Sonat at
   $1.08 per share                                                (118,827)                    (92,778)                  (93,140)
- ------------------------------------------------------------------------------------------------------------------------------------
   Balance at end of year                                        1,209,527                   1,858,871                 1,733,653
- ------------------------------------------------------------------------------------------------------------------------------------
Treasury Stock, at cost:
  Balance at beginning of year                       (1,438)       (64,881)         (831)      (29,703)     (1,077)      (31,534)
  Additions                                             (56)        (2,284)       (1,058)      (54,056)       (775)      (30,966)
  Issued                                                148          6,697           451        18,878       1,021        32,797
- ------------------------------------------------------------------------------------------------------------------------------------
   Balance at end of year                            (1,346)       (60,468)       (1,438)      (64,881)       (831)      (29,703)
- ------------------------------------------------------------------------------------------------------------------------------------
Total Stockholders' Equity                          110,042     $1,329,251       109,947    $1,961,776     110,560    $1,876,003
====================================================================================================================================
Comprehensive Income (Loss)                                     $ (532,162)                 $  211,078                $  259,366
====================================================================================================================================
</TABLE>

(*) Restated, See Note 2
See accompanying notes.



                                       6

<PAGE>   8


Consolidated Statements of Cash Flows
Consolidated Financial Statements
Sonat Inc. and Subsidiaries

<TABLE>
<CAPTION>
                                                                           (In Thousands)
                                                          ---------------------------------------------------
Years Ended December 31,                                      1998              1997(*)            1996(*)
- -------------------------------------------------------------------------------------------------------------
<S>                                                       <C>               <C>                  <C>
Cash Flows from Operating Activities:
  Net income (loss)                                       $  (530,517)      $   217,996          $ 255,840
  Adjustments to reconcile net income (loss) to
   net cash provided by operating activities:
     Depreciation, depletion and amortization,
       including ceiling test charges                       1,384,643           397,955            383,903
     Deferred income taxes                                   (321,986)           85,249            100,302
     Equity in earnings of unconsolidated
       affiliates, less distributions                         (38,255)          (31,914)           (23,040)
     Reserves for regulatory matters                           (4,237)          (10,212)          (167,154)
     Gas supply realignment costs                               1,067             7,514            187,929
     Change in:
       Accounts receivable                                    231,442            (7,781)          (261,932)
       Inventories                                             (3,932)          (34,111)            (7,002)
       Accounts payable                                      (213,965)           79,947            226,370
       Accrued interest and income taxes, net                  14,319            (2,248)            30,695
       Accrued long-term compensation                         (73,799)           57,493              1,266
       Other current assets                                     4,333            (4,256)            (3,589)
       Other current liabilities                              (37,765)           13,452              6,534
     Net change from trading activities                        (7,927)          (11,376)                --
     Net change in restricted cash                            115,956          (115,956)                --
     Other, net                                                (9,515)           (8,114)           (73,385)
- -------------------------------------------------------------------------------------------------------------
        Net cash provided by operating activities             509,862           633,638            656,737
- -------------------------------------------------------------------------------------------------------------
Cash Flows from Investing Activities:
  Plant, property and equipment additions                    (819,135)       (1,022,353)          (761,211)
  Net proceeds from disposal of assets                        325,333            49,842            149,367
  Investments in unconsolidated affiliates and other         (153,048)          (47,127)            (9,143)
- -------------------------------------------------------------------------------------------------------------
        Net cash used in investing activities                (646,850)       (1,019,638)          (620,987)
- -------------------------------------------------------------------------------------------------------------
Cash Flows from Financing Activities:
  Proceeds from issuance of long-term debt                    500,000         2,025,041            987,088
  Payments of long-term debt                                 (539,500)       (1,812,023)          (862,877)
  Changes in short-term borrowings                            273,640           288,691            (60,870)
- -------------------------------------------------------------------------------------------------------------
   Net changes in debt                                        234,140           501,709             63,341
  Dividends paid                                             (118,827)          (92,778)           (93,140)
  Treasury stock purchases                                     (1,289)          (53,176)           (30,914)
  Other                                                         2,790             9,514             22,264
- -------------------------------------------------------------------------------------------------------------
        Net cash provided by (used in)
          financing activities                                116,814           365,269            (38,449)
- -------------------------------------------------------------------------------------------------------------
Net Decrease in Cash and Cash Equivalents                     (20,174)          (20,731)            (2,699)
Cash and Cash Equivalents at Beginning of Year                 27,278            48,009             50,708
- -------------------------------------------------------------------------------------------------------------
Cash and Cash Equivalents at End of Year                  $     7,104       $    27,278          $  48,009
=============================================================================================================
Supplemental Disclosures of Cash Flow Information
Cash Paid For:
  Interest, net of amount capitalized                     $   119,898       $    99,426          $  75,870
  Income taxes paid (refunds received), net                     7,408            20,124             (4,914)
=============================================================================================================
</TABLE>

(*) Restated, See Note 2
See accompanying notes.



                                       7

<PAGE>   9


Notes to Consolidated Financial Statements
Sonat Inc. and Subsidiaries

NOTE 1    Business Description and Significant
Accounting Policies
Business Description - The Consolidated Financial Statements of Sonat Inc.
(Sonat) and its subsidiaries (the Company) reflect operations in the Exploration
and Production, Natural Gas Transmission and Energy Services segments. The
Exploration and Production segment is engaged in exploration, development and
production of domestic oil and natural gas. The Natural Gas Transmission segment
is primarily engaged in the interstate transmission and storage of natural gas.
The Energy Services segment is primarily engaged in the marketing of natural gas
and electric power and in power generation. For further description of business
segments, see Note 13. For a description of financial instruments, credit risk
and contingencies, see Notes 4 and 10.

         Principles of Consolidation - The Consolidated Financial Statements
include the accounts of Sonat and its subsidiaries. The Consolidated Financial
Statements have been restated for a change to the full cost method of accounting
for the Company's oil and gas operations (see Note 2). Intercompany transactions
and accounts have been eliminated in consolidation. The equity method of
accounting is used for investments in affiliates owned 50 percent or less.

         Use of Estimates in the Preparation of Financial Statements - In
preparing financial statements in conformity with generally accepted accounting
principles, management is required to make estimates and assumptions that affect
the reported amounts of assets and liabilities and the disclosure of contingent
assets and liabilities at the date of the financial statements and revenues and
expenses during the reporting period. Actual results could differ from those
estimates.

         Cash Equivalents - Cash equivalents are typically money-market
investments in the form of repurchase agreements, certificates of deposit and
time deposits with maturities of three months or less at the time of purchase.
These investments are accounted for at cost.

         Restricted Cash - At December 31, 1997, the Company had $116.0 million
of restricted cash. The restricted cash was held in trust by the issuing bank,
was restricted as to withdrawal and use, and was invested in cash equivalents.
The restricted cash was used to pay certain merger expenses in 1998 (see Note
3).

         Inventories - Inventories consist primarily of materials and supplies
and gas stored underground. Gas stored underground is carried at fair value,
which approximates average cost. Inventories of materials and supplies utilized
for ongoing replacements and expansions are reviewed regularly and adjusted to
their net realizable value.

         Gas Imbalance Receivables and Payables - For the Natural Gas
Transmission segment, gas imbalances represent the difference between gas
receipts from and gas deliveries to the Company's transportation and storage
customers. Gas imbalances arise when these customers deliver more or less gas
into the pipeline than they take out. Imbalances incurred prior to
implementation of Order No. 636 are settled through exchange of gas. Imbalances
incurred after implementation of Order No. 636 are settled monthly. For the
Energy Services segment, imbalances are subject to the terms of the various
pipelines.

         Plant, Property and Equipment and Depreciation - Plant, property and
equipment is carried at cost. The Company provides for depreciation on a
composite or straight-line basis, except for oil and gas properties. (See Notes
7 and 14.)

         The Company reviews its long-lived assets for impairment when events or
changes in circumstances indicate that the carrying amount of an asset may not
be recoverable. Other than for oil and gas properties no impairment was required
in any of the three years in the period ended December 31, 1998. See Notes 2 and
16 for ceiling test charges related to oil and gas properties.

         Oil and Gas Properties - The Company utilizes the full cost method of
accounting for its oil and gas properties. Under the full cost method, all
productive and non-productive costs incurred in connection with the acquisition,
exploration and development of oil and gas reserves are capitalized and
amortized on the unit-of-production method using proved reserves. Certain
unevaluated properties are excluded from the amortization base until a
determination has been made as to the existence of proved reserves. Since the
Company's operations are limited to the United States, it utilizes a single cost
center for amortization purposes. Capitalized costs are subject to a ceiling
test which limits such costs to the aggregate of the present value of future net
revenues plus the lower of cost or fair market value of unproved properties. Any
conveyances of properties are treated as adjustments to the cost of oil and gas
properties with no gain or loss recognized.

         Accounting for Regulated Operations - The regulated operations of the
Company are subject to the provisions of Statement of Financial Accounting
Standards (SFAS) No. 71, Accounting for the Effects of Certain Types of
Regulation. Accordingly, the Company records certain assets and liabilities that
result from the effects of the rate-making process that would not be recorded
under generally accepted accounting principles for non-regulated entities. The
regulatory assets and regulatory liabilities of the Company are primarily
classified as Deferred Charges and Other

                                       8
<PAGE>   10


Notes to Consolidated Financial Statements
Note 1 (continued)

and Deferred Credits and Other, respectively, in the Consolidated Balance
Sheets.

         Revenue Recognition - Revenue is recognized in the Exploration and
Production segment when deliveries of oil and natural gas are made. The
Company's Natural Gas Transmission segment recognizes revenue from natural gas
transportation in the period the service is provided. Reserves are provided on
revenues collected subject to refund when appropriate. Revenues are recognized
in the Energy Services segment when deliveries of the physical commodities are
made and, for the segment's trading portfolio, as changes in the fair value of
items in the portfolio occur.

         Commodity Price-Risk Management Activities - The Company uses
derivative instruments (commodity futures contracts, options and price swap
agreements) both to hedge its commodity price risk on natural gas, crude oil and
electricity, and as a market maker (trading activity) in natural gas and crude
oil.

         Natural gas, crude oil and electricity futures contracts are traded on
the New York Mercantile Exchange (NYMEX). Natural gas contracts are for fixed
units of 10,000 MMBtu and are available for up to 36 months in the future. Crude
oil contracts are for fixed units of 1,000 barrels and are available for periods
up to 30 months in the future. Electricity contracts are for 736 megawatt hours
and are available for up to 18 months in the future.

         Price swap agreements call for one party to make monthly payments to
(or receive payments from) another party based upon the differential between a
fixed and a variable price (fixed-price swap) or two variable prices (basis
swap) for a notional volume specified by the contract.

         Options can be exchange traded on the NYMEX or traded over-the-counter.
Exchange traded and over-the-counter options give the owner the right, but not
the obligation, to a futures contract or to buy or sell an underlying commodity
at a given price, respectively.

         Non-Trading Activities - Derivative positions taken specifically to
mitigate market price risk associated with significant physical transactions are
accounted for using hedge accounting provided they meet hedge accounting
criteria. Under hedge accounting, gains and losses from futures are deferred in
the Consolidated Balance Sheets in Deferred Credits and Other and recognized in
earnings in conjunction with the earnings recognition of the underlying
physical. Each net payment/receipt due or owed under the swap agreement is
recognized in earnings during the period to which the payment/receipt relates,
and there is no recognition in the Consolidated Balance Sheets for changes in
the swap's fair value. Gains or losses resulting from settlement of swaps are
amortized over their original terms. Cash flows from hedging activities are
recognized in the same section of the Consolidated Statements of Cash Flows as
the hedged transaction.

         The derivative instruments used to hedge commodity transactions have
historically had high correlation with commodity prices and are expected to
continue to do so. In the event that correlation is not maintained, the gains or
losses associated with the hedging instruments are immediately recognized to the
extent that correlation is lost.

         Trading Activities - The Company's trading portfolio consists of short-
and long-term energy-related purchase and sale commitments (physical and
derivative). All of these trading positions are reported at fair value and
recorded under the heading of Assets and Liabilities from Trading Activities
(current and long-term) in the Consolidated Balance Sheets. The change in fair
value is recognized in revenues as it occurs. Fair value is subject to change
and reflects an estimate of market prices considering various factors including
closing exchange and over-the-counter quotations, time value and volatility
factors underlying the commitments. These market prices are adjusted to reflect
the potential impact of liquidating Sonat Marketing's position in an orderly
manner over a reasonable period of time under present market conditions (see
Note 4).

         Environmental Expenditures - The Company provides for environmental
liabilities when environmental assessments and/or remediation are probable and
such costs to the Company can be reasonably estimated. Accruals for
environmental remediation liabilities are not material and have not been
discounted.

         Stock-Based Compensation - The Company follows the provisions of
Accounting Principles Board Opinion (APB) No. 25 for its stock-based
compensation awards (see Note 11).

         Capitalized Interest - The Company capitalizes interest costs
associated with non-producing leases and exploration and major development
projects until the related properties are evaluated and subject to depletion.
The Company also capitalizes interest costs on major projects during
construction. Interest is capitalized on borrowed funds and, where regulation by
the Federal Energy Regulatory Commission (FERC) exists, on internally generated
funds. The weighted average rate used by regulated subsidiaries is calculated in
accordance with FERC rules. Rates used by unregulated subsidiaries approximate
the average interest rate on related debt. Interest capitalized on internally
generated funds is included in Other income, net.

         Income Taxes - The Company follows a liability and asset approach in
accounting for income taxes. Deferred tax liabilities



                                      9

<PAGE>   11


and assets are determined using the tax rate for the period in which those
amounts are expected to be paid or received. (See Note 9.)

         Gas Supply Realignment Costs - Included in the Consolidated Statements
of Cash Flows are gas supply realignment costs that were incurred by the Company
to amend or terminate, or to purchase gas at above-market prices under its gas
purchase contracts as a result of the separation of its sales, transportation
and storage services mandated by FERC directive.

         Recent Accounting Pronouncements - In June 1997, the Financial
Accounting Standards Board (FASB) issued SFAS No. 130, Reporting Comprehensive
Income, which establishes standards for reporting and display of income and its
components (revenue, expenses, gains, and losses) in a full set of
general-purpose financial statements. The Company adopted SFAS No. 130 on
January 1, 1998, and has presented comprehensive income for all periods
presented in the Consolidated Statements of Changes in Stockholders' Equity.

         In June 1997, the FASB issued SFAS No. 131, Disclosure about Segments
of an Enterprise and Related Information, which establishes standards for the
way public companies report information about operating segments in annual
financial statements. SFAS No. 131, which is based on the management approach to
segment reporting, also establishes requirements to report selected segment
information quarterly and to report entity-wide disclosures about products and
services, major customers and the countries in which the entity holds assets and
reports revenue. The Company adopted SFAS No. 131 on January 1, 1998. (See Note
13.)

NOTE 2 Change in Method of Accounting for Oil and Gas Operations
In September 1998, the Company changed its accounting method for oil and gas
operations as conducted by its subsidiaries, Sonat Exploration Company and Sonat
Exploration GOM (Sonat Exploration), from the successful efforts method to the
full cost method because its capital spending is focused significantly more on
exploration activity than in the past. Full cost accounting, which amortizes
rather than expenses dry-hole exploration and other related costs, provides a
more appropriate method of matching revenues and expenses for the Company's
exploration strategy.

         The Company has restated all prior consolidated financial statements as
a result of the conversion to full cost accounting. As a part of this process,
all previous charges related to the impairment of Sonat Exploration's assets,
including those taken in 1998, were reversed, which significantly raised the
book value of those properties as well as the Company's stockholders' equity.
The full cost method, however, requires quarterly ceiling tests to ensure that
the carrying value of oil and gas properties is not overstated. Sonat
Exploration performed ceiling tests for each of the 1998 quarters. At March 31,
1998, June 30, 1998, and September 30, 1998, it was determined that capitalized
costs exceeded the ceiling test limits by $39.7 million, $540.5 million and
$455.0 million, respectively, which are included as ceiling test charges in the
Consolidated Statement of Operations. Future quarterly full cost ceiling tests
will be based on the then-current NYMEX prices for both natural gas and oil,
after adjustments.

         Since the net carrying value of the Company's oil and natural gas
properties has been reduced due to the full cost ceiling limitation such that
the present value of the Company's proved oil and gas reserves does not exceed
the Company's net oil and natural gas properties recorded on its balance sheet,
there is an increased risk of future property write-downs due to factors that
negatively affect the estimated present value of proved oil and gas reserves,
including volatile oil and natural gas prices, downward revisions in estimated
proved oil and natural gas quantities and unsuccessful exploratory operations
(see Note 16).

         The effect of the accounting change on net income (loss) is as follows:

<TABLE>
<CAPTION>
                                                 (In Thousands,
                                           Except Per-Share Amounts)
                                   -----------------------------------------
Years Ended December 31,              1998            1997         1996
- ----------------------------------------------------------------------------
<S>                                <C>             <C>           <C>
Effect on:
 Net income                        $(258,351)      $130,584      $18,006
 Earnings (loss) per share of
   common stock                        (2.35)          1.19          .16
 Earnings (loss) per share of
   common stock -
   assuming dilution                   (2.35)          1.17          .16
- ----------------------------------------------------------------------------
</TABLE>

   The effect of the accounting change on earnings by quarter for 1998 and 1997
is as follows (per-share amounts are on a diluted basis):

<TABLE>
<CAPTION>
                        (In Thousands, Except Per-Share Amounts)
                   ------------------------------------------------
                     Amount       Per Share     Amount    Per Share
                              1998                     1997
- -------------------------------------------------------------------
<S>                <C>             <C>         <C>         <C>
First              $ (10,063)      $ (.09)     $17,672     $.16
Second               (57,317)        (.52)      19,454      .17
Third               (250,164)       (2.27)      57,732      .52
Fourth                59,193          .54       35,726      .32
- -------------------------------------------------------------------
</TABLE>



                                       10
<PAGE>   12

Notes to Consolidated Financial Statements


NOTE 3    Changes in Operations
Business Combination - On January 30, 1998, following a special shareholders'
meeting, the Company completed the merger with Zilkha Energy Company by
exchanging approximately 24.2 million common shares for all of the outstanding
shares of Zilkha Energy. Zilkha Energy was a privately owned exploration and
production company. Immediately thereafter Zilkha Energy's name was changed to
Sonat Exploration GOM Inc.

         The merger constituted a tax-free reorganization and has been accounted
for as a pooling-of-interests under APB No. 16. Accordingly, all prior period
consolidated financial statements and notes have been restated to include Sonat
Exploration GOM in the Company's consolidated financial statements for all
periods presented.

         There were no transactions between Sonat and Sonat Exploration GOM
prior to the combination. Certain changes were made to the Sonat Exploration GOM
financial statements to conform to Sonat's basis of accounting presentation.

         The following are the revenues and net income (loss) for the previously
separate companies and the combined amounts presented in these consolidated
financial statements.

<TABLE>
<CAPTION>
                                        (In Thousands)
                          -----------------------------------------------
                            Month of         Years Ended December 31,
                          January 1998        1997             1996
- -------------------------------------------------------------------------
<S>                       <C>             <C>              <C>
Revenues:
 Sonat Inc.                 $380,302      $4,175,218       $3,038,425
 Sonat Exploration GOM        14,186         197,279          165,185
- -------------------------------------------------------------------------
   Combined                 $394,488      $4,372,497       $3,203,610
=========================================================================
Net Income (Loss):
 Sonat Inc.                 $ 13,459      $  219,011       $  213,409
 Sonat Exploration GOM         3,492          (1,015)          42,431
- -------------------------------------------------------------------------
   Combined                 $ 16,951      $  217,996       $  255,840
=========================================================================
</TABLE>

         In connection with the merger, Sonat Exploration GOM recorded charges
of $50.4 million ($32.7 million after taxes) to operating expenses in 1997 for
direct and other merger-related costs pertaining to the merger transaction.

         At December 31, 1997, Sonat Exploration GOM had accrued $73.8 million,
which represented compensation due to certain employees under deferred
compensation plans. The liability was estimated based on the fair market value
of Sonat Exploration GOM as of December 31, 1997. The Company's restricted cash
deposit at December 31, 1997, reflected on the Consolidated Balance Sheet was
used to settle this liability and certain other merger-related expenses. During
the years ended December 31, 1997 and 1996, $61.8 million and $12.0 million,
respectively, were expensed related to the deferred compensation plans.

         All debt of Sonat Exploration GOM was paid off in connection with the
merger.

         Sonat Exploration Restructuring - On April 23, 1998, the Company
announced a restructuring of Sonat Exploration. The restructuring included
significant property sales and certain cost-reduction activities associated
with a reduction in work force. Oil and natural gas properties having
approximately 430 billion cubic feet of natural gas equivalent reserves and
daily net production of approximately 170 million cubic feet of natural gas
equivalent were sold.

         A pretax restructuring charge of $15.0 million for restructuring
expenses primarily associated with a reduction in work force was recognized in
the second quarter of 1998. All work force reductions have been completed.

NOTE 4    Financial Instruments

Derivative Commodity Instruments Held or Issued for Trading Purposes

The Company maintains active trading positions in natural gas and crude oil
commodity futures, swap and option contracts. The Company manages its trading
positions with strict policies and procedures and limits its risk to changes in
the value of its outstanding positions through the use of Value-at-Risk models
and the establishment of offsetting positions. The trading operation also enters
into natural gas commodity purchase and sale commitments. These activities
constitute its trading business and are essential to provide customers with
market products at competitive prices.

   At December 31, 1998 and 1997, the Company's trading portfolio had
outstanding energy commodity futures, swaps and options. In the table below,
buys of swaps represent either 1) payment of fixed price and receipt of NYMEX or
index; or 2) payment of NYMEX or index and receipt of index. The absolute
notional volumes and terms are:

<TABLE>
<CAPTION>
                                                     1998
                                      -------------------------------------
                                       Notional Volume        Maximum
                                      ----------------
Commodity                             Buy         Sell           Term
- ---------------------------------------------------------------------------
<S>                                   <C>        <C>          <C>
Natural Gas (TBtu)                    1,506      1,454        60 months
Crude Oil (Thousands of Barrels)      5,640      2,310        60 months
- ---------------------------------------------------------------------------
</TABLE>

   The 60-month term deals begin in 2002 and end in 2006.

<TABLE>
<CAPTION>
                                                     1997
                                      -------------------------------------
                                       Notional Volume        Maximum
                                      ----------------
Commodity                             Buy         Sell           Term
- ---------------------------------------------------------------------------
<S>                                   <C>        <C>         <C>
Natural Gas (TBtu)                    372         284        33 months
- ---------------------------------------------------------------------------
</TABLE>



                                       11
<PAGE>   13


         The 33-month term deals were ongoing at December 31, 1997, and end in
2000.

         The amounts disclosed in the following table represent the
end-of-period fair value and the average fair value of the natural gas trading
portfolio.

<TABLE>
<CAPTION>
                                      In Thousands)
                     -----------------------------------------------------
                           Fair Value
                       (Carrying Amount)        Average Fair Value
                             as of              for the Year Ended
                     -----------------------------------------------------
December 31,           1998        1997          1998       1997
- --------------------------------------------------------------------------
<S>                  <C>         <C>          <C>         <C>
Assets               $255,495    $101,788     $140,774    $52,899
Liabilities           236,192      90,412      126,236     49,848
- --------------------------------------------------------------------------
</TABLE>

         Net trading gains for 1998 and 1997 are $13.1 million and $15.0
million, respectively.

Derivative Commodity Instruments Held or Issued for Purposes Other Than Trading

In certain cases derivative positions are taken specifically to mitigate market
price risk associated with significant physical transactions and are accounted
for using hedge accounting provided they meet hedge accounting criteria. Sonat
Exploration hedges a portion of its production by entering into intercompany
swaps with Sonat Marketing Company L.P. (Sonat Marketing). The exposure that
Sonat Marketing assumes from Sonat Exploration is then hedged by entering into
derivative instruments with third parties. Sonat Marketing and Sonat Power
Marketing also hedge third-party purchases and sales by entering into commodity
futures, swaps and options.

         At December 31, 1998 and 1997, the Company had outstanding energy
commodity futures, swaps and options for purposes other than trading. In the
table below, buys of swaps represent either 1) payment of fixed price and
receipt of NYMEX or index; or 2) payment of NYMEX or index and receipt of index.
The absolute notional volumes and terms are:

<TABLE>
<CAPTION>
                                                     1998
                                      -------------------------------------
                                       Notional Volume        Maximum
                                      ----------------
Commodity                             Buy         Sell           Term
- ---------------------------------------------------------------------------
<S>                                   <C>        <C>         <C>
Natural Gas (TBtu)                     17         103         24 months
Electricity (Thousands of MWh)         39          45          4 months
- ---------------------------------------------------------------------------
</TABLE>

   The 24-month term deals were ongoing at December 31, 1998 and end in 2000.

<TABLE>
<CAPTION>
                                                     1997
                                      -------------------------------------
                                       Notional Volume        Maximum
                                      ----------------
Commodity                             Buy         Sell           Term
- ---------------------------------------------------------------------------
<S>                                   <C>        <C>         <C>
Natural Gas (TBtu)                     38         214         58 months
Crude Oil (Thousands of Barrels)       --         480         12 months
- ---------------------------------------------------------------------------
</TABLE>

   The 58-month term deals were ongoing at December 31, 1997 and end in 2002.

   The information in the following table represents the fair value of
outstanding financial derivative positions held for purposes other than trading.
Not included are the related physical positions that these derivative positions
hedge.

<TABLE>
<CAPTION>
                                                   (In Thousands)
                                                ---------------------------
                                                   Fair Value as of
December 31,                                     1998           1997
- ---------------------------------------------------------------------------
<S>                                             <C>           <C>
Natural Gas:
 Futures                                        $  (439)      $   (873)
 Swaps                                           (7,158)       (27,458)
 Options                                             --           (516)
Electricity:
 Futures                                              1             --
 Options                                             12             --
- ---------------------------------------------------------------------------
</TABLE>

         Deferred amounts on open futures positions will mature over 1999 and
2000.

Credit Risk from Derivative Activities

NYMEX traded futures are guaranteed by the NYMEX and have nominal credit risk.
On all other transactions described above, the Company is exposed to credit risk
in the event of nonperformance by the counterparties. The Company has
established policies and procedures to evaluate potential counterparties for
creditworthiness before entering into over-the-counter swap and option
agreements. The credit risk resulting from in-the-money swaps is monitored on a
regular basis against established collateralization limits and credit limits
established by the Company. Due to changes in market conditions, the market
value of swaps and options and the associated credit exposure with the
counterparties can change significantly. At December 31, 1998, the market value
of the Company's in-the-money swaps and options was $21.0 million, and two
counterparties posted additional collateral in the amount of $.5 million.
Reserves for credit risk are established as necessary.

Financial Risk

On January 22, 1996, the Company entered into a forward rate agreement to hedge
the interest rate risk of an anticipated future borrowing under an existing
shelf registration statement. In September 1996, due to revised expectations of
external financing requirements, 50 percent of the forward rate agreement was
liquidated resulting in a gain of $3.9 million. A gain of $2.4 million was
recognized upon final settlement of this agreement in 1997.



                                       12
<PAGE>   14


Notes to Consolidated Financial Statements
Note 4 (continued)

Other Financial Instruments

The carrying amounts and fair values of the Company's financial instruments,
other than derivative instruments, are as follows:

<TABLE>
<CAPTION>
                                              (In Thousands)
                                    --------------------------------------
December 31, 1998                   Carrying Amounts       Fair Value
- --------------------------------------------------------------------------
<S>                                 <C>                   <C>
Cash and Cash Equivalents             $    7,104          $    7,104
Notes Receivable                          50,359              50,359
Investment in Debt and
 Equity Securities                        47,130              47,511
Gas Supply Realignment Costs               2,562               2,562
Unsecured Notes                          720,361             720,361
Long-Term Debt                         1,209,319           1,258,370
- --------------------------------------------------------------------------
</TABLE>

<TABLE>
<CAPTION>
                                              (In Thousands)
                                    --------------------------------------
December 31, 1997                   Carrying Amounts       Fair Value
- --------------------------------------------------------------------------
<S>                                 <C>                   <C>
Cash and Cash Equivalents             $   27,278          $   27,278
Restricted Cash                          115,956             115,956
Investment in Debt and
 Equity Securities                        52,231              53,101
Gas Supply Realignment Costs               3,630               3,630
Unsecured Notes                          446,721             446,721
Long-Term Debt                         1,250,492           1,294,854
- -------------------------------------------------------------------------------
</TABLE>
         The following methods and assumptions were used by the Company in
estimating its fair value disclosures for balance sheet financial instruments:

         Cash and cash equivalents, restricted cash, notes receivable, gas
supply realignment (GSR) costs and unsecured notes - The carrying amount
reported in the Consolidated Balance Sheets approximates its fair value.

         Investment in debt and equity securities - The fair values for
marketable debt and equity securities are based on quoted market prices.

         Long-term debt - The fair values of the Company's long-term debt are
based on quoted market values or estimated using discounted cash flow analyses,
based on the Company's current incremental borrowing rates for similar types of
borrowing arrangements.

         All of the Company's financial instruments, other than certain
derivative instruments, are held for purposes other than trading.

         The Company's financial instruments that are exposed to concentrations
of credit risk consist primarily of cash equivalents, investments and accounts
receivable.

         The Company's cash equivalents, restricted cash deposits and short-term
investments represent securities placed with various high investment grade
institutions. This investment practice limits the Company's exposure to
concentrations of credit risk.

         Accounts receivable of the Exploration and Production segment are
primarily from joint-interest partners, oil and gas marketing companies and
pipeline companies. A majority of its revenues are from Sonat Marketing, which
is headquartered in the Southeast. Accounts receivable of the Natural Gas
Transmission segment relate to business conducted with gas distribution
companies, municipalities, gas districts, industrial customers and interstate
pipeline companies in the Southeast. Accounts receivable of the Energy Services
segment primarily relate to trading with other marketing companies, industrial
end users and local distribution companies, with primary concentration in the
Gulf Coast, Southeastern, Northeastern and Midwestern markets.

         The Company performs ongoing credit evaluations of its customers'
financial condition and, in some circumstances, requires collateral from its
customers. Accounts receivable are stated net of valuation allowances of $9.3
million in 1998 and $8.2 million in 1997.

NOTE 5     Inventories
The table below shows the values of various categories of the Company's
inventories by segment.

<TABLE>
<CAPTION>
                                         (In Thousands)
                                     ---------------------------
December 31,                          1998             1997
- ----------------------------------------------------------------
<S>                                  <C>              <C>
Exploration and Production:
 Materials and supplies              $15,560          $16,954

Natural Gas Transmission:
 Materials and supplies               20,190           21,529

Energy Services:
 Materials and supplies                  210              247
 Gas stored underground               33,125           26,418

Other                                      8               13
- ----------------------------------------------------------------
                                     $69,093          $65,161
================================================================
</TABLE>

NOTE 6    Unconsolidated Affiliates
At December 31, 1998, the Company's investments in unconsolidated affiliates
totaled $635.7 million, and the Company's share of underlying equity in net
assets of the investees was $691.3 million. The difference is primarily due to
the excess over cost of the Company's share of the underlying equity in net
assets of Citrus Corp., which is being amortized over the depreciable life of
Citrus' assets. Through December 31, 1998, the Company's cumulative equity in
earnings of these unconsolidated affiliates was $377.9 million and cumulative
dividends received from them totaled $182.8 million.



                                       13
<PAGE>   15


         The following table presents the components of equity in earnings of
unconsolidated affiliates:

<TABLE>
<CAPTION>
                                                     (In Thousands)
                                       ---------------------------------------------
Years Ended December 31,                1998              1997               1996
- ------------------------------------------------------------------------------------
<S>                                    <C>              <C>                <C>
COMPANY'S SHARE OF REPORTED
 EARNINGS (LOSSES)

Exploration and Production             $   455          $    445           $    408
- ------------------------------------------------------------------------------------
Natural Gas Transmission:
 Citrus Corp. (including
   $1,383,000 of amortization
   of basis difference
   each year)                           24,371            28,676             22,902
 Bear Creek Storage                      9,531            10,679             10,184
 Destin                                  9,968             1,276                 --
 Other                                     167              (106)              (554)
- ------------------------------------------------------------------------------------
                                        44,037            40,525             32,532
- ------------------------------------------------------------------------------------
Energy Services                          2,885               817                  9
- ------------------------------------------------------------------------------------
Other                                    1,400             1,234              1,262
- ------------------------------------------------------------------------------------
                                       $48,777          $ 43,021           $ 34,211
====================================================================================
</TABLE>

         Natural Gas Transmission Affiliates - Sonat owns 50 percent of Citrus,
the parent company of Florida Gas Transmission Company. Southern owns a
one-third interest in Destin Pipeline Company, L.L.C. (Destin) and a subsidiary
of Southern owns 50 percent of Bear Creek Storage Company, an underground gas
storage company.

         The following is summarized financial information for Citrus:

<TABLE>
<CAPTION>
                                              (In Thousands)
                                  ----------------------------------------------
Years Ended December 31,            1998              1997              1996
- --------------------------------------------------------------------------------
<S>                               <C>               <C>               <C>
Revenues                          $591,005          $735,402          $769,860
Expenses:
 Natural gas cost                  269,818           416,953           429,367
 Operating expenses                102,001           107,370            94,573
 Depreciation and
   amortization                     51,771            60,470            83,563
 Interest and other                 92,715            78,563            92,079
 Income taxes                       28,726            17,460            27,240
- --------------------------------------------------------------------------------
Income Reported                   $ 45,974          $ 54,586          $ 43,038
================================================================================
</TABLE>

<TABLE>
<CAPTION>
                                                      (In Thousands)
                                               ---------------------------------
December 31,                                      1998                1997
- --------------------------------------------------------------------------------
<S>                                            <C>                 <C>
Assets:
 Current                                       $   81,133          $   79,390
 Net transmission plant and property            2,342,641           2,346,123
 Other                                             83,629              67,671
- --------------------------------------------------------------------------------
                                               $2,507,403          $2,493,184
================================================================================
Liabilities and Equity:
 Current                                       $  300,368          $  132,134
 Long-term debt and other liabilities           1,296,735           1,496,724
 Stockholders' equity                             910,300             864,326
- --------------------------------------------------------------------------------
                                               $2,507,403          $2,493,184
================================================================================
</TABLE>

   The following is summarized financial information for Bear Creek. No
provision for income taxes has been included since its income taxes are paid
directly by the joint venture participants.

<TABLE>
<CAPTION>
                                                 (In Thousands)
                                  -------------------------------------------
Years Ended December 31,           1998             1997             1996
- -----------------------------------------------------------------------------
<S>                               <C>              <C>              <C>    
Revenues                          $35,744          $36,226          $36,258
Expenses:
 Operating expenses                 6,819            4,440            4,817
 Depreciation                       5,441            5,430            5,415
 Other expenses, net                4,422            4,997            5,657
- -----------------------------------------------------------------------------
Income Reported                   $19,062          $21,359          $20,369
=============================================================================
</TABLE>

<TABLE>
<CAPTION>
                                       (In Thousands)
                                 ----------------------------
December 31,                       1998              1997
- -------------------------------------------------------------
<S>                              <C>               <C>
Assets:
 Current                         $ 11,687          $  6,503
 Net plant and property           144,519           149,334
 Other                                 --               296
- -------------------------------------------------------------
                                 $156,206          $156,133
=============================================================
Liabilities and Equity:
 Current                         $  7,968          $  8,298
 Long-term debt and
   other liabilities               43,140            48,799
 Participants' equity             105,098            99,036
- -------------------------------------------------------------
                                 $156,206          $156,133
=============================================================
</TABLE>

         In 1995, Southern executed a Capital Contribution Agreement in
connection with the project financing for Bear Creek from The Prudential
Insurance Company of America. In the event that Bear Creek does not refinance
the remaining principal, this agreement provides that Southern and its partner
will contribute $21.0 million each to Bear Creek on October 31, 2000, to provide
funds to enable Bear Creek to make a principal payment due under the financing.

         In April 1997, units of Shell Oil Company and BP Amoco Corporation
joined with Southern Natural Gas in the ownership of Destin, a 1
billion-cubic-foot-per-day pipeline designed to transport natural gas from
deep-water areas in the eastern Gulf of Mexico. Construction of the pipeline
began in December 1997. Destin was partially completed and placed in service in
September 1998 and was fully in service in March 1999. The FERC has approved two
extensions of Destin which extend its pipeline by



                                       14
<PAGE>   16


Notes to Consolidated Financial Statements
Note 6 (continued)


43 miles. The following is summarized financial information for Destin.

<TABLE>
<CAPTION>
                                             (In Thousands)
                                        ----------------------------
Years Ended December 31,                  1998             1997
- --------------------------------------------------------------------
<S>                                     <C>                <C>   
Revenues                                $ 11,978           $1,049
Expenses (Income):
 Operating expenses                          820               --
 Depreciation and amortization               641               --
 Interest and other                      (19,388)           2,778
- --------------------------------------------------------------------
Income Reported                         $ 29,905           $3,827
====================================================================
</TABLE>

<TABLE>
<CAPTION>
                                                     (In Thousands)
                                               -----------------------------
December 31,                                     1998              1997
- ----------------------------------------------------------------------------
<S>                                            <C>               <C>
Assets:
 Current                                       $ 23,867          $ 54,885
 Net transmission plant and property            417,102            81,864
 Other                                           12,626             1,429
- ----------------------------------------------------------------------------
                                               $453,595          $138,178
============================================================================
Liabilities and Equity:
 Current                                       $140,792          $  4,315
 Long-term debt and other liabilities            19,571             2,236
 Stockholders' equity                           293,232           131,627
- ----------------------------------------------------------------------------
                                               $453,595          $138,178
============================================================================
</TABLE>

         In November 1998 Destin issued bonds to the Mississippi Business
Finance Corporation (MBFC) in the amount of $135.0 million. The three members of
Destin each purchased $45.0 million of these bonds from the MBFC, which loaned
the proceeds from the sale of the bonds to Destin. Destin used the proceeds from
this loan to finance the construction of its pipeline project, which allowed it
to return invested capital to its three members.

NOTE 7 Plant, Property and Equipment and Depreciation
Plant, property and equipment, by business segment, is shown in the following
table:

<TABLE>
<CAPTION>
                                                    (In Thousands)
                                            --------------------------------
December 31,                                   1998                1997
- ----------------------------------------------------------------------------
<S>                                         <C>                 <C>
Exploration and Production:
 Costs subject to amortization              $5,420,473          $5,022,140
 Costs not subject to amortization             148,615             201,208
- ----------------------------------------------------------------------------
                                             5,569,088           5,223,348
- ----------------------------------------------------------------------------
Natural Gas Transmission:
 Mainline transmission property              1,642,291           1,295,247
 Gas supply                                    506,965             660,700
 Gas gathering                                  10,261              16,568
 Underground storage facilities                 61,494              60,684
 Liquefied natural gas facilities              154,076             154,076
 Other                                         297,138             269,498
- ----------------------------------------------------------------------------
                                             2,672,225           2,456,773
- ----------------------------------------------------------------------------
Energy Services:
 Intrastate pipeline                            56,012              55,834
 Other                                          32,168              22,334
- ----------------------------------------------------------------------------
                                                88,180              78,168
- ----------------------------------------------------------------------------
Other                                           70,441              72,408
- ----------------------------------------------------------------------------
                                            $8,399,934          $7,830,697
============================================================================
</TABLE>

         Plant, property and equipment includes construction work in progress of
$142.6 million and $137.1 million at December 31, 1998 and 1997, respectively.
Plant, property and equipment also includes $142.1 million and $130.1 million of
gas stored underground at December 31, 1998 and 1997, respectively.

         The accumulated depreciation, depletion and amortization amounts, by
business segment, are as follows:

<TABLE>
<CAPTION>
                                                   (In Thousands)
                                           ---------------------------------
December 31,                                  1998                1997
- ----------------------------------------------------------------------------
<S>                                        <C>                 <C>
Exploration and Production                 $4,093,898          $2,700,122
- ----------------------------------------------------------------------------
Natural Gas Transmission:
 Mainline transmission property               866,198             844,885
 Gas supply                                   449,485             434,205
 Gas gathering                                  6,206              11,072
 Underground storage facilities                47,850              45,869
 Liquefied natural gas facilities             123,802             118,981
 Other                                         40,449              42,815
- ----------------------------------------------------------------------------
                                            1,533,990           1,497,827
- ----------------------------------------------------------------------------
Energy Services:
 Intrastate pipeline                           29,727              26,819
 Other                                         10,570               6,435
- ----------------------------------------------------------------------------
                                               40,297              33,254
- ----------------------------------------------------------------------------
Other                                          35,582              33,714
- ----------------------------------------------------------------------------
                                           $5,703,767          $4,264,917
============================================================================
</TABLE>


                                       15

<PAGE>   17
         The annual depreciation rates or useful productive lives, by business
segment, are as follows:

<TABLE>
<CAPTION>
                                              1998             1997             1996
- ----------------------------------------------------------------------------------------
<S>                                       <C>              <C>              <C>
Natural Gas Transmission:
 Mainline transmission property                 2.0%             2.0%             2.0%
 Gas supply                                     2.9%             2.9%             2.9%
 Gas gathering                                  2.8%             2.8%             2.8%
 Underground storage facilities                 3.3%             3.3%             3.3%
 Liquefied natural gas facilities               3.2%             3.2%             3.2%
Energy Services
  Intrastate pipeline                        20 yrs.          20 yrs.              --
  Other                                       5 yrs.           5 yrs.           5 yrs.
Other                                      5-38 yrs.        5-38 yrs.        5-38 yrs.
========================================================================================
</TABLE>

         Under the full cost method, all productive and non-productive costs
incurred in connection with the acquisition, exploration and development of oil
and gas reserves are capitalized and amortized on the unit-of-production method
using proved reserves. Certain unevaluated properties are excluded from the
amortization base until a determination has been made as to the existence of
proved reserves. Also included in amortization on a unit-of-production basis are
the estimated future dismantlement and abandonment costs and estimated future
development costs for proved undeveloped reserves.

         During the first quarter of 1998, the Company recognized the effect of
a change in salvage values, including reversal of excess depreciation expense,
relating to certain fixed assets, primarily aircraft and vehicles. The change,
which was to comply with FERC directives, reduced the loss for the year ended
December 31, 1998, by approximately $4.6 million.

NOTE 8 Debt and Lines of Credit

         Long-Term Debt - Long-term debt consists of:

<TABLE>
<CAPTION>
                                                               (In Thousands)
                                                    -------------------------------------
December 31,                                            1998                   1997
- -----------------------------------------------------------------------------------------
<S>                                                 <C>                   <C>
Sonat Inc.
 Revolving Credit Agreement at
   rates based on prime,
   international or money-market
   lending rates (an effective
   rate of 6.14% at December 31,
   1997) expiring on
   June 30, 2001                                    $        --           $   130,000
 6.75% Notes due October 1, 2007                        100,000               100,000
 6 7/8% Notes due June 1, 2005                          200,000               200,000
 9 1/2% Notes due August 15, 1999                       100,000               100,000
 6 5/8% Notes due February 1, 2008                      100,000                    --
 7% Notes due February 1, 2018                          100,000                    --
 9% Notes due May 1, 2001                               100,000               100,000
 8.24% Senior Notes due through
   December 31, 2000                                      4,100                 6,200
Sonat Exploration GOM Inc.
 Senior Revolving Credit Facility (an
   effective rate of 7.22% at
   December 31, 1997) expiring
   on October 31, 1999                                       --               145,000
 10.6% Senior Subordinated Notes
   due July 26, 2001                                         --                50,000
Southern Natural Gas Company
 6.125% Notes due September 15, 2008                    100,000                    --
 6.70% Notes due October 1, 2007                        100,000               100,000
 7.85% Notes due January 15, 2002                       100,000               100,000
 8 5/8% Notes due May 1, 2002                           100,000               100,000
 8 7/8% Notes due February 15, 2001                     100,000               100,000
Southern LNG Inc.
 Promissory Note (an effective rate of
   6.75% at December 31, 1998 and
   1997) due through April 1, 1999                        5,000                10,000
Capital Leases and Other                                  3,754                11,042
- -----------------------------------------------------------------------------------------
Total Outstanding                                     1,212,854             1,252,242
Less Long-Term Debt Due Within
 One Year                                              (109,835)              (14,508)
Less Unamortized Debt Discount                           (3,535)               (1,750)
- -----------------------------------------------------------------------------------------
                                                    $ 1,099,484           $ 1,235,984
=========================================================================================
</TABLE>


                                       16

<PAGE>   18


Notes to Consolidated Financial Statements
Note 8 (continued)

         Annual maturities of long-term debt at December 31, 1998, are as
follows:

<TABLE>
<CAPTION>
Years                                              (In Thousands)
- --------------------------------------------------------------------
<S>                                                  <C>
1999                                                $  109,835
2000                                                     2,805
2001                                                   200,214
2002                                                   200,000
2003                                                        --
2004-2018                                              700,000
- --------------------------------------------------------------------
                                                    $1,212,854
====================================================================
</TABLE>

         Sonat has a bank revolving credit agreement that provides for periodic
borrowings and repayments of up to $500.0 million through June 30, 2001.
Borrowings are supported by unsecured promissory notes that, at the option of
the Company, will bear interest at the banks' prevailing prime or international
lending rate, or such rates as the banks may competitively bid. During 1998,
$200.0 million was borrowed and $330.0 million was repaid under the revolving
credit agreement, resulting in no balance outstanding at December 31, 1998.

         In January 1998, Sonat made two public offerings of Notes pursuant to a
shelf registration statement. In one offering, Sonat issued $100.0 million of 6
5/8 percent Notes due February 1, 2008, at 99.531 percent to yield 6.69 percent.
In the other offering, Sonat issued $100.0 million of 7 percent Notes due
February 1, 2018, at 99.787 percent to yield 7.02 percent. The net proceeds from
the offerings were used for general corporate purposes, including capital
expenditures, working capital and repayment of debt.

         In September 1998, Southern Natural Gas made a public offering of
$100.0 million of its 6.125 percent Notes due September 15, 2008, at 99.531
percent to yield 6.189 percent. The net proceeds from the offering were used for
general corporate purposes, including capital expenditures.

         Unsecured Notes - Loans under all short-term credit facilities are for
a duration of less than three months.

         At December 31, 1998, Sonat had short-term lines of credit of $700.0
million available through January 25, 1999. Southern Natural Gas had short-term
lines of credit of $50.0 million available through May 31, 1999. Borrowings are
available for a period of not more than 364 days and are in the form of
unsecured promissory notes that bear interest at rates based on the banks'
prevailing prime, international or money-market lending rates. At December 31,
1998, Sonat had $24.3 million outstanding under its agreement at a rate of 5.87
percent. No amounts were outstanding under Southern Natural Gas' agreement.

         In late January 1999, Sonat completed a new 364-day $400.0 million
revolving credit facility with 11 banks. In connection with this new credit
facility, the Company terminated existing lines of credit providing for up to
$700.0 million of borrowings.

         Sonat had $696.1 million and $446.6 million, respectively, in
commercial paper outstanding at average rates of 5.96 percent and 6.31 percent
at December 31, 1998 and 1997, respectively.

NOTE 9    Income Taxes
An analysis of the Company's income tax expense (benefit) is as follows:

<TABLE>
<CAPTION>
                                                       (In Thousands)
                                      --------------------------------------------------
Years Ended December 31,                 1998               1997              1996
- ----------------------------------------------------------------------------------------
<S>                                   <C>                 <C>               <C>
Current:
 Federal                              $  18,548           $ 12,435          $ 18,841
 State                                    5,690              8,067             4,021
- ----------------------------------------------------------------------------------------
                                         24,238             20,502            22,862
- ----------------------------------------------------------------------------------------
Deferred:
 Federal                               (325,663)            82,777            94,911
 State                                    3,677              2,472             5,391
- ----------------------------------------------------------------------------------------
                                       (321,986)            85,249           100,302
- ----------------------------------------------------------------------------------------
Income Tax Expense (Benefit)          $(297,748)          $105,751          $123,164
========================================================================================
</TABLE>

         Net deferred tax liabilities are comprised of the following:

<TABLE>
<CAPTION>
                                                 (In Thousands)
                                           -------------------------------
December 31,                                 1998               1997
- --------------------------------------------------------------------------
<S>                                        <C>               <C>
Deferred Tax Liabilities:
 Depreciation                              $240,098          $ 585,314
 Inventories                                 11,130             11,573
 Other                                       17,078             10,468
- --------------------------------------------------------------------------
   Total deferred tax liabilities           268,306            607,355
- --------------------------------------------------------------------------
Deferred Tax Assets:
 GSR and other transition costs               8,531             10,210
 Employee benefits                            7,708             36,607
 Net operating loss carryforwards            33,098             46,065
 Tax credit carryforwards                    22,859             14,713
 Other accounting accruals                   12,066              7,954
 Other                                       20,080             17,361
- --------------------------------------------------------------------------
                                            104,342            132,910
 Less valuation allowance                        --            (11,505)
- --------------------------------------------------------------------------
   Total deferred tax assets                104,342            121,405
- --------------------------------------------------------------------------
Net Deferred Tax Liabilities               $163,964          $ 485,950
==========================================================================
</TABLE>



                                       17
<PAGE>   19


         In assessing the realizability of deferred tax assets, management
considers whether it is more likely than not that some portion or all of the
deferred tax assets will not be realized. During 1998, the Company removed its
valuation allowance related to net operating loss carryforwards because based on
the weight of available evidence, it is more likely than not that the remaining
deferred tax assets will be realized.

         At December 31, 1998, the Company had available net operating loss
carryforwards of approximately $94.6 million for income tax purposes which
expire between 2001 and 2017. The Company has tax credit carryforwards of
approximately $22.9 million which can be carried forward indefinitely.

         Consolidated income tax expense (benefit) is different from the amount
computed by applying the U.S. federal income tax rate to income (loss) before
income tax. The reasons for this difference are as follows:

<TABLE>
<CAPTION>
                                                      (In Thousands)
                                      -------------------------------------------------
Years Ended December 31,                1998                1997                1996
- ------------------------------------------------------------------------------------------
<S>                                   <C>                 <C>                 <C>
Income Tax Expense (Benefit)
 at Statutory Federal Income
 Tax Rates                            $(289,893)          $ 113,311           $ 132,651
Increases (Decreases)
 Resulting From:
   State income taxes, net
    of federal income
    tax benefit                           6,089               6,851               6,118
   Non-conventional fuel
    tax credits                          (6,844)             (7,220)             (9,465)
   Refunds and adjustment
    of accrued tax position                (110)                 47                 880
   Dividend exclusion                    (6,824)             (8,029)             (6,413)
   Other                                   (166)                791                (607)
- ------------------------------------------------------------------------------------------
Income Tax Expense
 (Benefit)                            $(297,748)          $ 105,751           $ 123,164
==========================================================================================
</TABLE>

NOTE 10    Commitments and Contingencies

Rate Matters - Periodically, Southern makes general rate filings with the FERC
to provide for the recovery of cost of service and a return on equity. The FERC
normally allows the filed rates to become effective, subject to refund, until it
rules on the approved level of rates. Southern provides reserves relating to
such amounts collected subject to refund, as appropriate, and makes refunds upon
establishment of the final rates. At December 31, 1998, Southern's rates are
established by a settlement that was approved by FERC orders issued in 1995 and
1996. All of its customers are parties to the settlement, and all revenue is
based on the final settlement rates and therefore is not being collected subject
to refund.

         Other Matters - In September 1998, West Georgia Generating Company
L.P., formerly Cataula Generating Company, L.P. (West Georgia), acquired the
right to develop a 680-megawatt peaking plant in west central Georgia and an
associated contract to sell a significant portion of the plant's output to
Georgia Power Company. Although West Georgia originally planned to develop the
plant in Harris County, Georgia, as a result of the revocation by the Harris
County Board of Commissioners of the previously issued special-use permit, West
Georgia is in the process of finalizing alternate sites for the location of the
plant. If the project experiences additional delays in site finalization,
permitting or construction, it could result in an inability to have the plant
available in time to meet its obligation to make 205 megawatts of electric
capacity available to Georgia Power beginning June 1, 2000. In that event, West
Georgia would be required to source electric capacity from the market at prices
in excess of the prices received from Georgia Power. However, West Georgia
anticipates that it will be successful in relocating the plant to one of its
alternative sites and commencing construction in time to meet its contractual
commitments to Georgia Power.



                                       18
<PAGE>   20

Notes to Consolidated Financial Statements
Note 10 (continued)


         Sonat Marketing was formed in September 1995 and is jointly owned by
a subsidiary of the Company and a subsidiary of AGL Resources, Inc. Sonat's
wholly owned subsidiary, Sonat Marketing Company, contributed all of its assets
and liabilities except $32.0 million of accounts receivable in exchange for a 65
percent ownership interest in Sonat Marketing, and a subsidiary of AGL
Resources, contributed $32.0 million in cash to Sonat Marketing in exchange for
a 35 percent ownership interest. AGL Resources has certain rights to resell to
the Company its interest in Sonat Marketing, including a right until August 31,
2000, to receive the greater of fair market value or a formula price. The pretax
gain on the transaction of approximately $23 million, which is included in Other
Deferred Credits in the Consolidated Balance Sheets, has been deferred.

         Leases - The Company has operating lease commitments expiring at
various dates, principally for office space and equipment. The Company has no
significant capital leases. 

         Rental expense for all operating leases is summarized below.


Rental Expense

<TABLE>
<CAPTION>
                                           (In Thousands)
                                    -----------------------------
Years Ended December 31,              1998       1997       1996
- -----------------------------------------------------------------
<S>                                 <C>        <C>        <C>  
Non-Affiliated Operating Leases     $19,904    $20,377    $18,444
Affiliated Operating Leases           3,950      3,544      3,680
- -----------------------------------------------------------------
                                    $23,854    $23,921    $22,124
=================================================================
</TABLE>

         At December 31, 1998, future minimum payments for non-cancelable
operating leases for the years 1999 through 2003 are $12 million or less per
year. Future minimum rentals to be received under subleases for the years 1999
and 2000 are less than $2 million per year.

NOTE 11  Capital Stock and Stock-Based Compensation Per-share prices of the
Company's common stock, based on the New York Stock Exchange listing of
composite transactions, and dividends paid per common share for the last two
years are summarized below.

Price Range and Dividends Paid Per Common Share

<TABLE>
<CAPTION>
                                          (Unaudited)
                          ---------------------------------------------
Quarter                            1998                    1997
- -----------------------------------------------------------------------
<S>                       <C>           <C>        <C>          <C>
Price Range High-Low
 First                    $45   5/8  -  $38  7/8   $57       -  $45 1/2
 Second                    44 13/16  -   36         59 1/8   -   50 5/8
 Third                     38  9/16  -   25  7/8    54 1/4   -   45 3/8
 Fourth                    31   3/8  -   26 5/16    51 5/16  -   42 1/4
=======================================================================
Dividend Rate (Note)
  First                                 $    .27                $   .27
  Second                                     .27                    .27
  Third                                      .27                    .27
  Fourth                                     .27                    .27
- -----------------------------------------------------------------------
                                        $   1.08                $  1.08
=======================================================================
Shareholders of
  Record at Year-End                      10,589                 11,258
=======================================================================
</TABLE>

Note:  The dividend rate is the actual rate paid per common share of Sonat 
stock, exclusive of shares issued for the merger in January 1998 (see Note 3).

         The Company had no restrictions on the payment of dividends at December
31, 1998.

         The Company has a Preference Share Rights Plan (the Plan) designed to
protect the interest of stockholders in the event of a hostile attempt to take
over the Company and to make it more difficult for a person to gain control of
the Company in a manner or on terms not approved by the Board of Directors. The
Plan provides for the issuance of one right with respect to each outstanding
share of common stock. The rights issued under the Plan are redeemable at any
time by the Company before their expiration on February 3, 2006, unless certain
triggering events have occurred. The rights outstanding under the Plan are
exercisable for one one-hundredth of a share of Series A Participating
Preference Stock, par value $1.00, with each share having substantially the
rights and preferences of 100 shares of common stock. As of December 31, 1998,
1,000,000 shares of Series A Participating Preference Stock were reserved for
issuance under this Plan.



                                       19
<PAGE>   21

         Earnings Per Share - The following table presents the computation of
basic and diluted earnings (loss) per share of common stock:

<TABLE>
<CAPTION>
                                   (In Thousands, Except Per-Share Amounts)
                                  -----------------------------------------
Years Ended December 31,             1998            1997           1996
- ---------------------------------------------------------------------------
<S>                               <C>              <C>             <C>
Numerator:
 Net income (loss)                $(530,517)       $217,996        $255,840   
===========================================================================      
Denominator:                                                                    
Denominator for Basic                                                           
 Earnings (Loss) Per Share:                                                     
   Weighted average number                                                      
    of shares of common                                                         
    stock outstanding               110,020         110,099         110,370     
Effect of Dilutive Securities:                                                  
 Common stock equivalents                                                       
   applicable to outstanding                                                    
   stock options (Note)                  --           1,570           1,352 
- ---------------------------------------------------------------------------    
Denominator for Earnings                                                        
 (Loss) Per Share -                                                             
 Assuming Dilution:                                                             
                                                                                
   Adjusted weighted                                                            
    average shares using                                                        
    treasury stock method                                                       
    for assumed conversions         110,020         111,669         111,722
===========================================================================     
Earnings (Loss) Per Share                                                       
 of Common Stock                  $   (4.82)       $   1.98        $   2.32
===========================================================================
Earnings (Loss) Per Share                                                       
 of Common Stock -                                                              
 Assuming Dilution                $   (4.82)       $   1.95        $   2.29  
===========================================================================
</TABLE>
                                                                              
Note:  The addition of 1,002,000 potential common shares for the 1998 period
would be antidilutive in the computation of diluted earnings per share and are
therefore not included.

         Executive Award Plan - The Company has an Executive Award Plan that
provides awards to certain key employees in the form of stock options,
restricted stock and stock appreciation rights (SARs) in tandem with any or all
stock options. In years prior to 1991, tax offset payments were generally
provided in conjunction with these awards. SARs permit the holder of an
exercisable option to surrender that option for an amount equal to the excess of
the market price of the common stock on the date of exercise over the option
price (appreciation). The appreciation is payable in cash, common stock or a
combination of both. SARs are subject to the same terms and conditions as the
options to which they are related. Commencing in November 1995, the Company has
issued, in tandem with its regular stock options, SARs that are exercisable only
in the event of a change in control (limited SARs). In November 1995, the
Company also issued limited SARs to certain key employees with respect to all of
their then outstanding options. No other SARs have been issued since 1990. At
December 31, 1998, 89,000 SARs relating to the earlier periods were outstanding.
All options granted since December 1992 have 10-year terms and vest and become
fully exercisable at the end of five years of continued employment. Options
issued after 1992 also contain an acceleration provision dependent upon a
specified increase in the Company's stock price. Options granted prior to
December 1992 vested over three years and had no accelerated vesting provisions.
The Company issued 18,400 shares of restricted stock with a $35.48 per share
market value to employees during 1998, 80,100 shares with a $43 13/16 per share
market value during 1997 and 97,000 shares with a $52.00 per share market value
during 1996. At December 31, 1998, 229,798 of the 550,200 cumulative restricted
shares issued have vested. A new plan was authorized during 1995 which made an
additional four million shares available for issuance.

         The Company has elected to follow APB No. 25, Accounting for Stock
Issued to Employees, and related Interpretations in accounting for its employee
stock options. Under APB No. 25, compensation expense is recognized for the
difference between the option price and market value on the measurement date for
variable stock option awards and restricted stock grants. No compensation
expense is recognized for options the Company issued after 1990 because the
exercise price of the stock options equals the market price of the underlying
stock on the date of grant.

         Stock-based compensation increased pretax income by $5.8 million in
1998 and $2.0 million in 1997 and decreased it by $13.2 million in 1996.

         Pro forma information regarding net income and earnings per share is
required by SFAS No. 123, Accounting for Stock-Based Compensation, and has been
determined as if the Company had 



                                       20
<PAGE>   22

Notes to Consolidated Financial Statements
Note 11 (continued)


accounted for its employee stock options under the fair value method of the
Statement. The fair value for these options was estimated at the date of grant
using a Black-Scholes option pricing model with the following weighted-average
assumptions for 1998, 1997 and 1996, respectively: interest rates (zero-coupon
U.S. government issues with a remaining life of six years) of 4.95 percent, 5.93
percent and 6.10 percent; dividend yields of 3.54 percent, 2.47 percent and 2.35
percent; volatility factors of the expected market price of the Company's common
stock of .292, .266 and .255; and a weighted-average expected life of the
options of six years.

         The Black-Scholes option valuation model was developed for use in
estimating the fair value of traded options which have no vesting restrictions
and are fully transferable. In addition, option valuation models require the
input of highly subjective assumptions including the expected stock price
volatility. Because the Company's employee stock options have characteristics
significantly different from those of traded options, and because changes in the
subjective input assumptions can materially affect the fair value estimate, in
management's opinion, the existing models do not necessarily provide a reliable
single measure of the fair value of its employee stock options.

         The Company's pro forma information follows:

<TABLE>
<CAPTION>
                                  (In Thousands, Except Per-Share Amounts)
                                --------------------------------------------
Years Ended December 31,              1998             1997            1996
- ----------------------------------------------------------------------------
<S>                             <C>              <C>             <C>  
Net Income (Loss):
 As reported                    $  (530,517)     $   217,996     $   255,840
 Pro forma                         (533,027)         216,773         253,173
Earnings (Loss) Per Share:
 As reported                    $     (4.82)     $      1.98     $      2.32
 Pro forma                            (4.84)            1.97            2.29
Earnings (Loss) Per Share -
 Assuming Dilution:
 As reported                    $     (4.82)     $      1.95     $      2.29
 Pro forma                            (4.84)            1.94            2.27
============================================================================
</TABLE>

         For purposes of the pro forma disclosures, the estimated fair value of
the options is amortized to expense over the options' vesting period, which is
five years for the awards. However, since all of the 1995 stock option grants
vested under an accelerated vesting clause in 1996, the entire remaining cost
for that award is reflected in 1996. Because the Company's stock options vest
generally over five years and additional awards are typically made each year,
the above pro forma disclosures are not likely to be representative of the
effects on pro forma net income or loss for future years.

         A summary of the Company's stock option activity and related
information follows:

<TABLE>
<CAPTION>
Years Ended December 31,                                  1998  
- ---------------------------------------------------------------------------     
                                                              Weighted-Avg.         
                                                   Options   Exercise Price  
- --------------------------------------------------------------------------- 
<S>                                              <C>         <C>   
Outstanding - Beginning of Year                   4,416,219      $32.74           
Granted                                           1,323,100       30.48           
Exercised                                          (190,424)      19.80           
Forfeited                                           (68,480)      45.79 
- ---------------------------------------------------------------------------          
Outstanding - End of Year                         5,480,415       32.48 
===========================================================================          
Exercisable - End of Year                         3,444,075       30.25 
===========================================================================          
Shares Authorized for Future Grants               1,561,000        
===========================================================================               
Fair Value of Options Granted During the Year    $     7.53                       
===========================================================================

<CAPTION>

                                                          1997   
- ---------------------------------------------------------------------------
                                                              Weighted-Avg.  
                                                   Options   Exercise Price 
- --------------------------------------------------------------------------- 
<S>                                              <C>         <C>   
Outstanding - Beginning of Year                   4,178,226     $30.16 
Granted                                             712,400      43.81 
Exercised                                          (453,907)     25.69 
Forfeited                                           (20,500)     46.90 
- --------------------------------------------------------------------------- 
Outstanding - End of Year                         4,416,219      32.74 
===========================================================================
Exercisable - End of Year                         3,217,419      27.38 
===========================================================================
Shares Authorized for Future Grants               2,884,700   
===========================================================================  
Fair Value of Options Granted During the Year    $    12.50    
===========================================================================

<CAPTION>
 
                                                          1996          
- ---------------------------------------------------------------------------
                                                             Weighted-Avg.
                                                   Options   Exercise Price 
- --------------------------------------------------------------------------- 
<S>                                             <C>          <C>    
Outstanding - Beginning of Year                   4,578,600     $25.24  
Granted                                             633,700      52.00  
Exercised                                        (1,013,954)     21.58  
Forfeited                                           (20,120)     31.81  
- --------------------------------------------------------------------------- 
Outstanding - End of Year                         4,178,226      30.16 
=========================================================================== 
Exercisable - End of Year                         3,544,526      26.26  
===========================================================================
Shares Authorized for Future Grants               3,597,100             
===========================================================================
Fair Value of Options Granted During the Year   $     14.87             
=========================================================================== 
</TABLE>

         The following table summarizes information about stock options
outstanding at December 31, 1998:

<TABLE>
<CAPTION>
                                     Options Outstanding
                          -----------------------------------------
                                        Weighted-Avg.
                             Number      Remaining 
   Range of Exercise      Outstanding   Contractual  Weighted-Avg.
        Prices             12/31/98         Life     Exercise Price
- -------------------------------------------------------------------
<S>                       <C>           <C>          <C>  
 $ 13.625  -  $17.4375       365,050         2.9         $16.31
 $ 21.125  -  $ 29.125     2,345,130         7.1          26.42
 $  30.00  -  $  32.25     1,266,815         5.8          30.99
 $43.8125  -  $  52.00     1,503,420         8.6          47.14
- -------------------------------------------------------------------
                           5,480,415

<CAPTION>

                            Options Exercisable
                        ---------------------------
                          Number
Range of Exercise       Exercisable  Weighted-Avg.
    Prices               12/31/98    Exercise Price
- ---------------------------------------------------
<S>                     <S>              <C>   
$ 13.625  -  $17.4375     365,050        $16.31   
$ 21.125  -  $ 29.125   1,262,630         25.54    
$  30.00  -  $  32.25   1,266,815         30.99    
$43.8125  -  $  52.00     549,580         48.64 
- ---------------------------------------------------
                        3,444,075              
===================================================
</TABLE>



                                       21
<PAGE>   23

         Directors' Restricted Stock Plan - The Company has a Restricted Stock
Plan for non-employee members of the Board of Directors. Full rights vest over a
maximum of five years. The Company issued 24,000 shares under this plan in 1998.
The Company did not issue any shares under this plan during 1997 and 1996. At
December 31, 1998, 35,860 of the 61,460 cumulative shares granted have vested.

         Treasury Stock - Shares held in treasury are being reissued in
connection with employee stock options and restricted stock programs.

         Serial Preference Stock - At December 31, 1998 and 1997, there were
10,000,000 shares of $1.00 par value Serial Preference Stock authorized, with
none issued.

NOTE 12    Retirement Plans and Other

Postemployment Benefits

Retirement Plans - The Company has a trusteed, non-contributory, tax qualified
defined benefit retirement plan (the Retirement Plan) covering substantially all
employees of the Company. A supplemental benefit plan (the Supplemental Plan)
that provides retirement benefits in excess of those allowed under the Company's
tax qualified retirement plan is also in effect for the Company.

         Amounts are being placed in a trust established to provide benefits
under the Supplemental Plan. However, this trust is not subject to any funding
requirements. At December 31, 1998, this trust had assets with a fair market
value of $47.5 million available to pay benefits. These assets are not
considered plan assets under SFAS No. 87, Employers' Accounting for Pensions.

         The following tables set forth the benefit obligation and assets of the
plans and the changes in the benefit obligation and plan assets:

<TABLE>
<CAPTION>
                                                  (In Thousands)
                                            ------------------------
Years Ended December 31,                        1998           1997
- --------------------------------------------------------------------
<S>                                         <C>            <C> 
Change in Benefit Obligation:
 Benefit obligation at January 1,           $ 372,687      $ 386,825
 Service cost                                  10,892          7,848
 Interest cost                                 28,209         26,858
 Amendments                                      (341)            --
 Actuarial loss (gain)                         31,351        (25,959)
 Effect of curtailment                         (5,518)        (3,096)
 Effect of special termination benefits         4,121          3,252
 Benefits paid                                (24,020)       (23,041)
- --------------------------------------------------------------------
 Benefit obligation at December 31,         $ 417,381      $ 372,687
====================================================================
Change in Plan Assets:
 Fair value at January 1,                   $ 550,982      $ 459,033
 Return on plan assets                         76,312        111,983
 Contributions                                  3,395          3,007
 Benefits paid                                (24,020)       (23,041)
- --------------------------------------------------------------------
 Fair value at December 31,                 $ 606,669      $ 550,982
====================================================================
</TABLE>

         The following table sets forth the funded status of the plans and the
amount of the net pension asset or liability recognized in the Company's
Consolidated Balance Sheets:

<TABLE>
<CAPTION>
                                                  (In Thousands)
                                            ------------------------
December 31,                                    1998           1997
- --------------------------------------------------------------------
<S>                                         <C>            <C> 
Funded Status                               $ 189,288      $ 178,295
Unrecognized Net Assets at Transition          (7,612)        (9,292)
Unrecognized Net Gain                        (166,188)      (172,566)
Unrecognized Prior Service Cost                 5,516          7,088
Net Unamortized Deferred Charge from
 Early Retirement Termination Benefits            453            598
- --------------------------------------------------------------------
Net Pension Asset Recognized in the
 Consolidated Balance Sheets                $  21,457      $   4,123
====================================================================
Total Recognized Amounts in the
 Consolidated Balance Sheets Consist of:
   Prepaid benefit cost                     $  53,642      $  33,170
   Accrued benefit liability                  (33,893)       (29,887)
   Intangible asset                             1,255            242
   Net unamortized deferred charge from
    early retirement termination benefits         453            598
- --------------------------------------------------------------------
                                            $  21,457      $   4,123
====================================================================
</TABLE>



                                       22
<PAGE>   24

Notes to Consolidated Financial Statements
Note 12 (continued)

         The projected benefit obligation and accumulated benefit obligation for
the pension plan with accumulated benefit obligations in excess of plan assets
were $51.1 million and $33.9 million, respectively, as of December 31, 1998, and
$40.4 million and $29.9 million, respectively, as of December 31, 1997.
   
         The assumed rates used to measure the projected benefit obligations and
the expected earnings of plan assets are:

<TABLE>
<CAPTION>
Years Ended December 31,                       1998    1997   1996
- ------------------------------------------------------------------
<S>                                            <C>     <C>    <C> 
Discount Rate                                   7.0%    7.5%   7.0%
Long-Term Rate of Return                       10.5%    9.5%   9.5%
Increase in Future Compensation Levels
 (Composite Rate):
   Retirement and Supplemental Plans            5.0%    5.0%   5.0%
==================================================================
</TABLE>

         The Company's net periodic pension income consists of the following
components: 

<TABLE>
<CAPTION>
                                            (In Thousands)
                                ------------------------------------ 
Years Ended December 31,           1998          1997          1996
- --------------------------------------------------------------------
<S>                             <C>           <C>           <C> 
Service Cost                    $ 10,892      $  7,848      $  8,818
Interest Cost                     28,209        26,858        26,550
Expected Return                  (48,586)      (40,107)      (37,795)
Amortization of Prior
 Service Cost                        816           868           868
Amortization of Net Asset
 at Transition                    (1,679)       (1,679)       (1,679)
Amortization of Net Gain          (3,054)       (2,379)           76
Curtailment Gain                  (4,803)       (2,959)           --
Special Termination
 Benefits Loss                     4,121         3,252            --
- --------------------------------------------------------------------
Net Periodic Pension Income     $(14,084)     $ (8,298)     $ (3,162)
====================================================================
</TABLE>

         Other Postemployment Benefits - The Company has plans that provide for
postretirement health care and life insurance benefits to substantially all of
its employees when they retire. The Company accrues the cost of postretirement
health care and life insurance benefits within the employees' active service
periods. The Company has elected to amortize the transition obligation over a
20-year period.

         The following tables set forth the benefit obligation and assets of the
Company's postretirement health care and life insurance plans and the changes in
the benefit obligation and plan assets: 

<TABLE>
<CAPTION>
                                                 (In Thousands) 
                                            ----------------------
Years Ended December 31,                       1998          1997
- ------------------------------------------------------------------
<S>                                         <C>           <C> 
Change in Benefit Obligation:
 Benefit obligation at January 1,           $ 82,956      $ 95,027
 Service cost                                  2,005         2,137
 Interest cost                                 5,870         6,575
 Plan participants' contributions                987           904
 Actuarial loss (gain)                         1,695       (14,833)
 Effect of curtailment                        (1,389)          233
 Effect of special termination benefits        1,824           100
 Benefits paid                                (6,836)       (7,187)
- ------------------------------------------------------------------
 Benefit obligation at December 31,         $ 87,112      $ 82,956
==================================================================
Change in Plan Assets:
 Fair value at January 1,                   $ 38,923      $ 32,595
 Return on plan assets                         6,276         4,109
 Employer's contribution                       9,614         8,502
 Plan participants' contributions                987           904
 Benefits paid                                (6,836)       (7,187)
- ------------------------------------------------------------------
 Fair value at December 31,                 $ 48,964      $ 38,923
==================================================================
</TABLE>

         The following table sets forth the funded status and amount of the net
pension asset or liability at December 31, 1998 and 1997, for the Company's
postretirement health care and life insurance plans: 

<TABLE>
<CAPTION>
                                                 (In Thousands) 
                                            ----------------------
December 31,                                   1998          1997
- ------------------------------------------------------------------
<S>                                         <C>           <C> 
Funded Status                               $(38,148)     $(44,033)
Unrecognized Net Obligation at Transition     43,151        51,994
Unrecognized Net Gain                        (32,918)      (31,649)
Net Unamortized Deferred Charge From
 Early Retirement Termination Benefit          1,442         1,980
- ------------------------------------------------------------------
Accrued Postretirement Benefit Liability    $(26,473)     $(21,708)
==================================================================
Total Recognized Amounts in the
 Consolidated Balance Sheets Consist of:
   Prepaid benefit cost                     $     --      $    204
   Accrued benefit liability                 (27,915)      (23,892)
   Net unamortized deferred charge from
    early retirement termination benefit       1,442         1,980
- ------------------------------------------------------------------
                                            $(26,473)     $(21,708)
==================================================================
</TABLE>



                                       23


<PAGE>   25

         The assumed rates used to measure the projected benefit obligation and
the expected earnings of plan assets are:

<TABLE>
<CAPTION>
Years Ended December 31,          1998     1997     1996
- --------------------------------------------------------
<S>                               <C>      <C>      <C>   
Discount Rate                      7.0%     7.5%     7.0%
Long-Term Rate of Return:
 Medical assets (after tax)        6.5%     5.5%     5.5%
 Life insurance assets            10.5%     7.5%     7.5%
========================================================
</TABLE>

         The rate of increase in the per capita costs of covered health care
benefits is assumed to be 4.5 percent in 1999 and for all future years.

         The Company's net periodic cost for postretirement health care and life
insurance benefits consists of the following components: 

<TABLE>
<CAPTION>
                                                   (In Thousands)
                                       ------------------------------------
Years Ended December 31,                  1998          1997          1996
- ---------------------------------------------------------------------------
<S>                                    <C>           <C>           <C> 
Service Cost                           $  2,005      $  2,137      $  2,161
Interest Cost                             5,870         6,575         6,387
Expected Return on Plan Assets           (2,772)       (2,069)       (1,617)
Amortization of Net Obligation
 at Transition                            3,469         3,597         3,597
Amortization of Net Gain                 (1,722)         (820)         (367)
Curtailment Loss                          4,180         1,866            --
Special Termination Benefits Loss         1,824           100            --
- ---------------------------------------------------------------------------
                                       $ 12,854      $ 11,386      $ 10,161
===========================================================================
</TABLE>

         A one-percentage-point change in assumed health care cost trend rates
would have the following effects:

<TABLE>
<CAPTION>
                                                    (In Thousands)
                                             ----------------------------
                                             1-Percentage-  1-Percentage-
                                                 Point          Point
                                               Increase       Decrease
- -------------------------------------------------------------------------
<S>                                          <C>            <C> 
Effect on total of service and interest
 cost components                                $1,156        $  (939)
Effect on postretirement benefit obligation      8,964         (7,684)
=========================================================================
</TABLE>

NOTE 13   Business Segment Analysis

The Company's consolidated financial statements reflect operations in three
segments: Exploration and Production, Natural Gas Transmission and Energy
Services.

         The Company is engaged in the exploration for and the acquisition,
development and production of oil and natural gas through its Exploration and
Production segment. The oil and gas properties of the Exploration and Production
segment are located principally onshore in the Southern coastal states, in
various states in the Southwest, and in federal waters offshore Louisiana and
Texas. It derives a significant portion of its revenues from sales to Sonat
Marketing (included in the Energy Services segment).
 
         The principal business of the Natural Gas Transmission segment is the
transmission and storage of natural gas in interstate commerce. Its transmission
systems are located in the Southeastern United States. Transportation service is
provided for its distribution customers primarily for residential and commercial
end use; industrial customers; electric generation companies; gas producers;
other gas pipelines; and gas marketing and trading companies. It provides
transportation service in both its gas supply and market areas. The principal
industries served directly by the natural gas transmission segment's pipeline
system and indirectly through its distribution customers' systems include the
electric generation, fertilizer, chemical, pulp and paper, textile, primary
metals, stone, clay and glass industries.

         The Energy Services segment is engaged primarily in natural gas and
electric power marketing for industrial and commercial users, gas distribution
companies and gas producers throughout the Gulf Coast, Southeastern, Midwestern
and Northeastern United States and development of power systems and power
plants.

         The Company's results of operations, revenues from major customers,
capital expenditures and assets by business segment are shown in the following
tables. Intersegment sales are primarily gas sales by the Exploration and
Production segment and transportation revenue by the Natural Gas Transmission
segment and are priced at market rates. The Company has no foreign operations.



                                       24


<PAGE>   26

Notes to Consolidated Financial Statements
Note 13 (continued)


Business Segment Analysis

<TABLE>
<CAPTION>
                                                                           (In Thousands)
                                                    ------------------------------------------------------------
                                                    Exploration        Natural
                                                         and             Gas           Energy
Year Ended December 31, 1998                         Production     Transmission      Services          Total
- ----------------------------------------------------------------------------------------------------------------
<S>                                                 <C>             <C>             <C>              <C> 
Revenues from External Customers                    $   173,874      $  357,678     $ 3,191,320      $ 3,722,872
Intersegment Revenues                                   361,380          36,538           1,048          398,966
Interest Income                                              80           3,494           3,023            6,597
Interest Expense                                         78,071          40,114           4,255          122,440
Interest Capitalized                                      2,371           2,506             246            5,123
Depreciation, Depletion and Amortization                291,586          46,281           7,032          344,899
Unusual Items                                         1,050,195              --              --        1,050,195
Equity in Earnings of Unconsolidated Affiliates             455          44,037           2,885           47,377
Earnings (Loss) Before Interest and Taxes              (936,230)        233,268          (6,820)        (709,782)
Investment in Unconsolidated Affiliates                   6,090         549,520          69,212          624,822
Segment Assets                                        1,635,597       1,961,994         762,547        4,360,138
Capital Expenditures                                    581,059         222,165           9,971          813,195
================================================================================================================
</TABLE>

<TABLE>
<CAPTION>
                                                                           (In Thousands)
                                                      -------------------------------------------------
                                                      Exploration    Natural
                                                          and          Gas          Energy
Year Ended December 31, 1997                          Production  Transmission    Services       Total
- --------------------------------------------------------------------------------------------------------
<S>                                                   <C>         <C>            <C>          <C>
Revenues from External Customers                      $  345,520   $  359,163    $3,725,186   $4,429,869
Intersegment Revenues                                    409,555       34,129            --      443,684
Interest Income                                            1,261        2,233         2,670        6,164
Interest Expense                                          64,540       30,612         1,874       97,026
Interest Capitalized                                       5,599        1,849            --        7,448
Depreciation, Depletion and Amortization                 341,278       47,769         5,557      394,604
Unusual Items                                             50,374           --            --       50,374
Equity in Earnings of Unconsolidated Affiliates              445       40,525           817       41,787
Earnings Before Interest and Taxes                       180,972      225,905         7,063      413,940
Investment in Unconsolidated Affiliates                    5,679      467,453         9,192      482,324
Segment Assets                                         2,764,381    1,757,851       744,626    5,266,858
Capital Expenditures                                     862,609      144,269        10,978    1,017,856
========================================================================================================
</TABLE>
   
<TABLE>
<CAPTION>
                                                                           (In Thousands)
                                                       -----------------------------------------------------
                                                       Exploration    Natural      
                                                          and           Gas           Energy
Year Ended December 31, 1996                           Production  Transmission      Services        Total
- ------------------------------------------------------------------------------------------------------------
<S>                                                    <C>         <C>             <C>            <C>
Revenues from External Customers                        $319,730     $  362,194    $2,589,468     $3,271,392
Intersegment Revenues                                    410,520         36,634         3,234        450,388
Interest Income                                            1,092          5,077         5,008         11,177
Interest Expense                                          57,059         38,060           984         96,103
Interest Capitalized                                       6,658            984            --          7,642
Depreciation, Depletion and Amortization                 332,129         48,292         1,729        382,150
Equity in Earnings of Unconsolidated Affiliates              408         32,532             9         32,949
Earnings Before Interest and Taxes                       252,845        204,782         5,841        463,468
Capital Expenditures                                     620,100        130,418         4,736        755,254
============================================================================================================
</TABLE>
                                                


                                       25


<PAGE>   27

         The following table reconciles the total of the Company's reportable
segments' revenues to the Company's consolidated revenues:

<TABLE>
<CAPTION>
                                           (In Thousands)
                             ---------------------------------------------
Years Ended December 31,          1998             1997             1996
- --------------------------------------------------------------------------
<S>                          <C>              <C>              <C> 
Total Revenues for
 Reportable Segments         $ 4,121,838      $ 4,873,553      $ 3,721,780
Other Revenues                        17               15             (524)
Elimination of
 Intersegment Revenues          (398,966)        (443,684)        (450,388)
Other Reclassifications          (13,071)         (57,387)         (67,258)
- --------------------------------------------------------------------------
   Total Consolidated
    Revenues                 $ 3,709,818      $ 4,372,497      $ 3,203,610
==========================================================================
</TABLE>

         The following table reconciles the total of the Company's reportable
segments' earnings before interest and taxes (EBIT) to the Company's
consolidated EBIT:

<TABLE>
<CAPTION>
                                          (In Thousands)
                               ------------------------------------
Years Ended December 31,          1998          1997         1996
- -------------------------------------------------------------------
<S>                            <C>            <C>          <C>  
Total EBIT for
 Reportable Segments           $(709,782)     $413,940     $463,468
Other EBIT                         7,772         6,999        4,423
- -------------------------------------------------------------------
   Total Consolidated EBIT     $(702,010)     $420,939     $467,891
===================================================================
</TABLE>

         The following table reconciles the total of the Company's reportable
segments' assets to the Company's consolidated assets:

<TABLE>
<CAPTION>
                                                (In Thousands)
                                         ----------------------------
December 31,                                 1998             1997
- ---------------------------------------------------------------------
<S>                                      <C>              <C>  
Total Assets for Reportable Segments     $ 4,360,138      $ 5,266,858
Other Assets                               2,874,572        2,885,865
Elimination of Intercompany
 Receivables and Payables                 (2,850,311)      (2,867,051)
Other Eliminations                           (23,305)         (33,558)
- ---------------------------------------------------------------------
   Total Consolidated Assets             $ 4,361,094      $ 5,252,114
=====================================================================
</TABLE>

Revenues from Major Customers

<TABLE>
<CAPTION>
                                          (In Thousands)
                                ----------------------------------
Years Ended December 31,           1998         1997         1996
- ------------------------------------------------------------------
<S>                             <C>          <C>          <C> 
Enron and affiliates:
 Exploration and production     $ 63,265     $181,206     $167,843
 Natural gas transmission              3          180          156
 Energy services                 157,950      264,399      202,130
- ------------------------------------------------------------------
                                $221,218     $445,785     $370,129
==================================================================
Atlanta Gas Light:
 Natural gas transmission       $134,045     $130,425     $134,062
 Energy services                  17,303       51,069       54,191
- ------------------------------------------------------------------
                                $151,348     $181,494     $188,253
==================================================================
Alabama Gas Corporation:
 Natural gas transmission       $ 47,956     $ 48,300     $ 38,662
 Energy services                 105,134       87,994       86,062
- ------------------------------------------------------------------
                                $153,090     $136,294     $124,724
==================================================================
</TABLE>

         All of the major customers or their affiliates participate with the
Company in certain joint venture operations.


NOTE 14    Oil and Gas Operations (Unaudited) 
At December 31, 1998, the Company had interests in oil and gas properties that
are located primarily in Texas, Louisiana, Oklahoma, Arkansas, Alabama, and
offshore Louisiana and Texas in the Gulf of Mexico. The Company does not own or
lease any oil and gas properties outside the United States.

         Capitalized costs relating to oil and gas producing activities and
related accumulated depreciation, depletion and amortization were as follows:


Capitalized Costs

<TABLE>
<CAPTION>
                                            (In Thousands)
                                      -------------------------
December 31,                             1998           1997
- ---------------------------------------------------------------
<S>                                   <C>            <C> 
Oil and Gas Properties:
 Costs subject to amortization        $5,420,473     $5,022,140
 Costs not subject to amortization       148,615        201,208
- ---------------------------------------------------------------
                                       5,569,088      5,223,348
Less Accumulated Depreciation,
 Depletion and Amortization            4,093,898      2,700,122
- ---------------------------------------------------------------
                                      $1,475,190     $2,523,226
===============================================================
</TABLE>



                                       26



<PAGE>   28

Notes to Consolidated Financial Statements
Note 14 (continued)


         Costs incurred in oil and gas producing activities, whether capitalized
or expensed, were as follows:

Costs Incurred

<TABLE>
<CAPTION>
                                               (In Thousands)
                                     ----------------------------------
Years Ended December 31,                1998         1997         1996
- -----------------------------------------------------------------------
<S>                                  <C>          <C>          <C> 
Property Acquisition Costs:
 Proved properties                   $  1,592     $  5,811     $ 61,441    
 Unproved properties                   48,292       77,935       72,705    
Exploration Costs                     155,879      287,884      177,199    
Development Costs                     371,500      488,724      295,821   
- -----------------------------------------------------------------------
   Total Costs                       $577,263     $860,354     $607,166 
=======================================================================
</TABLE>
   
         An analysis of the capitalized costs by year of expenditure of oil and
gas properties that are not being amortized as of December 31, 1998, pending
determination of proved reserves follows:

Capitalized Costs Not Being Amortized

<TABLE>
<CAPTION>
                                     (In Thousands)
             ---------------------------------------------------------------
               Cumulative           Costs Excluded for           Cumulative
                 Balance            Years Ended Dec.31,            Balance
             ---------------------------------------------------------------
             DEC. 31, 1998     1998        1997        1996    Dec. 31, 1995
- ----------------------------------------------------------------------------
<S>          <C>             <C>         <C>         <C>       <C> 
Acquisition     $ 93,931     $39,559     $24,220     $18,386     $11,766
Exploration       54,684      41,573      12,644         467          --
- ----------------------------------------------------------------------------
                $148,615     $81,132     $36,864     $18,853     $11,766
============================================================================
</TABLE>

         Projects presently excluded from amortization are in various stages of
evaluation. The majority of these costs are expected to be included in the
amortization calculation in the years 1999 through 2003. Total amortization
expense, including ceiling test charges, per unit of production was $4.81,
$1.41, and $1.03 per thousand cubic feet equivalent in 1998, 1997 and 1996,
respectively.

         Net quantities of proved developed and undeveloped reserves of natural
gas and crude oil, including condensate and natural gas liquids, and changes in
such quantities were as follows:

Reserve Data

<TABLE>
<CAPTION>
                                                      Liquids          Gas      Liquids          Gas      Liquids          Gas
                                                      (MBbls)         (Bcf)     (MBbls)         (Bcf)     (MBbls)        (Bcf)
                                                      --------------------------------------------------------------------------
December 31,                                                   1998                      1997                      1996
- --------------------------------------------------------------------------------------------------------------------------------
<S>                                                   <C>            <C>        <C>            <C>        <C>            <C>
Proved (Developed and Undeveloped) Reserves, Net:
 Beginning of year                                     72,882        2,160.6     65,984        2,006.4     55,304        1,711.7
 Revisions of previous estimates                      (12,816)        (349.4)     4,506          156.6      4,134           58.0
 Extensions, discoveries and other additions            1,688          118.5     10,540          287.1     21,307          457.2
 Purchases of reserves in place                            --            5.9        850           20.6      2,158          151.3
 Sales of reserves in place                           (23,710)        (287.6)      (433)         (43.7)    (7,941)        (103.5)
 Production                                            (8,327)        (225.7)    (8,565)        (266.4)    (8,978)        (268.3)
- --------------------------------------------------------------------------------------------------------------------------------
   End of Year                                         29,717        1,422.3     72,882        2,160.6     65,984        2,006.4
================================================================================================================================
Proved Developed Reserves:
 Beginning of year                                     45,225        1,557.5     33,327        1,395.8     30,455        1,184.1
 End of year                                           24,743        1,122.6     45,225        1,557.5     33,327        1,395.8
================================================================================================================================
</TABLE>

MBbls-Thousands of barrels 
Bcf-Billion cubic feet     



                                       27


<PAGE>   29
        The significant changes to reserves, other than acquisitions, 
dispositions or production, are due to reservoir performance in existing fields
and drilling of additional wells in existing fields. There were no major
discoveries or other events, favorable or adverse, that may be considered to
have caused a significant change in the estimated proved reserves since December
31, 1998.

         Results of operations from producing activities by fiscal year were as
follows:


Results of Operations

<TABLE>
<CAPTION>
                                            (In Thousands)
                              -----------------------------------------
Years Ended December 31,           1998           1997           1996
- -----------------------------------------------------------------------
<S>                           <C>              <C>            <C>
Net Revenues:
  Sales                       $   179,258      $ 347,219      $ 331,757
  Affiliated sales                361,380        409,555        410,520
- -----------------------------------------------------------------------
   Total                          540,638        756,774        742,277
Production Costs                  (91,470)      (116,112)       (96,235)
Depreciation, Depletion
  and Amortization             (1,326,765)      (341,278)      (332,129) 
- -----------------------------------------------------------------------
                                 (877,597)       299,384        313,913
Income Tax (Expense) 
  Benefit                         313,497        (97,603)      (100,488)
- ------------------------ ----------------------------------------------
Results of Operations from
  Producing Activities
  (Excluding Corporate
  Overhead and Interest
  Costs)                      $  (564,100)     $ 201,781      $ 213,425
=======================================================================
</TABLE>

         The standardized measure of discounted future net cash flows relating
to proved oil and gas reserves follows:


Standardized Measure of Discounted Future Net Cash Flows

<TABLE>
<CAPTION>
                                            (In Thousands)
                             ------------------------------------------
December 31,                     1998            1997           1996
- -----------------------------------------------------------------------
<S>                          <C>             <C>            <C>
Future Cash Inflows          $ 3,124,205     $ 6,059,477    $ 8,551,630
Future Production and
  Development Costs           (1,027,931)     (1,889,348)    (1,881,447)
Future Income Tax
  Expenses                      (317,572)       (912,059)    (1,776,403)
- -----------------------------------------------------------------------
Future Net Cash Flows          1,778,702       3,258,070      4,893,780
- -----------------------------------------------------------------------
10% Annual Discount
  for Estimated Timing
  of Cash Flows                 (616,435)     (1,058,622)    (1,499,656)
- -----------------------------------------------------------------------
Standardized Measure
  of Discounted Future
  Net Cash Flows             $ 1,162,267     $ 2,199,448    $ 3,394,124
=======================================================================
</TABLE>       

         For the calculations in the preceding table, estimated future cash
inflows from estimated future production of proved reserves were computed using
realized oil and gas prices for the month of December of each respective year.

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


Changes in Standardized Measure of Discounted Future Net Cash Flows

<TABLE>
<CAPTION>
                                            (In Thousands)
                             ------------------------------------------

Years Ended December 31,          1998            1997          1996
- -----------------------------------------------------------------------
<S>                          <C>             <C>            <C> 
Sales and Transfers of
  Oil and Gas
  Produced, Net of
  Production Costs           $  (449,168)    $  (640,662)   $ (646,042)
Net Changes in Prices
  and Production Costs          (389,252)     (1,858,640)    1,583,674
Extensions, Discoveries
  and Improved
  Recovery, Less
  Related Costs                   71,557         328,665     1,156,729
Changes in Estimated
  Future Development
  Costs                           36,269         (83,805)       28,320
Development Costs
  Incurred During the
  Period                         182,447         228,798        60,259
Revisions of Previous
  Quantity Estimates            (413,484)        175,081       164,214
Accretion of Discount            268,797         449,400       185,091
Net Change in Income
  Taxes                          379,228         611,352      (891,355)
Purchases of Reserves
  in Place                         4,441          23,628       318,084
Sales of Reserves
  in Place                      (468,770)        (47,170)     (256,706)
Changes in Production
  Rates (Timing) and
  Other                         (259,246)       (381,323)       49,465
- ----------------------------------------------------------------------
                             $(1,037,181)    $(1,194,676)   $1,751,733
======================================================================
</TABLE>



                                       28

<PAGE>   30
Notes to Consolidated Financial Statements


NOTE 15  Quarterly Results (Unaudited)
Selected unaudited quarterly data is shown below:

<TABLE>
<CAPTION>
                                                                         (In Thousands, Except Per-Share Amounts)
                                                            -------------------------------------------------------------
                                                                       1st            2nd             3rd           4th 
                                                                     Quarter        Quarter        Quarter        Quarter
- -------------------------------------------------------------------------------------------------------------------------
<S>                                                               <C>             <C>            <C>            <C>
1998(1)(2)
Revenues                                                          $1,109,143      $ 925,132      $ 874,497      $ 801,046
Operating Income (Loss)                                               59,474       (474,888)      (389,322)        41,372
Earnings (Loss) Before Interest and Taxes                             69,298       (457,199)      (368,801)        54,692
Net Income (Loss)                                                     27,950       (315,296)      (258,416)        15,245

=========================================================================================================================
Earnings (Loss) Per Share of Common Stock                         $      .25      $   (2.87)     $   (2.35)     $     .14
=========================================================================================================================
Earnings (Loss) Per Share of Common Stock - Assuming Dilution     $      .25      $   (2.87)     $   (2.35)     $     .14
=========================================================================================================================
</TABLE>


<TABLE>
<CAPTION>
                                                                         (In Thousands, Except Per-Share Amounts)
                                                            -------------------------------------------------------------
                                                                       1st            2nd             3rd           4th 
                                                                     Quarter        Quarter        Quarter        Quarter
- -------------------------------------------------------------------------------------------------------------------------
<S>                                                              <C>             <C>            <C>            <C>
1997(2)(3)
Revenues                                                         $1,123,529      $ 855,925      $1,073,715     $1,319,328
Operating Income                                                    138,220         67,153          91,507         75,137
Earnings Before Interest and Taxes                                  153,637         78,011         100,994         88,297
Net Income                                                           87,538         36,306          52,348         41,804
=========================================================================================================================
Earnings Per Share of Common Stock                               $      .79      $     .33      $      .48     $      .38
=========================================================================================================================
Earnings Per Share of Common Stock - Assuming Dilution           $      .78      $     .32      $      .47     $      .38
=========================================================================================================================
</TABLE>

(1)      See Note 2 for information on quarterly ceiling test charges recorded
         in 1998.
(2)      In September 1998, the Company changed its accounting method for its
         oil and gas operations (see Note 2).
(3)      Net income for the fourth quarter of 1997 includes a charge of $32.7
         million, or $.29 per share (diluted), related to merger expenses (see
         Note 3)

NOTE 16 Subsequent Event (Unaudited)

The Company recognized a $1,035.2 Million non-cash write-down of its oil and
natural gas properties as a result of its change to the full cost method of
accounting during the third quarter of 1998.

     Due to the substantial recent volatility in oil and gas prices and their
effect on the carrying value of the Company's proved oil and gas reserves, there
can be no assurance that future write-downs will not be required as a result of
factors that may negatively affect the present value of proved oil and natural
gas reserves and the carrying value of oil and natural gas properties, including
volatile oil and natural gas prices, downward revisions in estimated proved oil
and natural gas reserve quantities and unsuccessful drilling activities.

     Based on current market prices and current estimates, the Company
anticipates a first quarter ceiling test write-down of approximately $200
million. This estimate is based upon a number of assumptions that are subject to
change dependent on future events, however, including changes in oil and gas
prices and the impact of reserve changes during the quarter.


                                       29

<PAGE>   31

Selected Consolidated Financial Data (Unaudited)
Sonat Inc. and Subsidiaries

<TABLE>
<CAPTION>
                                                                       (In Millions, Except Per-Share Amounts)
                                                     --------------------------------------------------------------------------
                                                          1998            1997            1996          1995            1994
- -------------------------------------------------------------------------------------------------------------------------------
<S>                                                  <C>             <C>            <C>             <C>             <C>        
Revenues                                             $   3,709.8     $   4,372.5    $   3,203.6     $   1,902.4     $   1,481.9
Costs and Expenses                                       4,473.2         4,000.5        2,771.5         1,626.7         1,281.3
- -------------------------------------------------------------------------------------------------------------------------------
Operating Income (Loss)                                   (763.4)          372.0          432.1           275.7           200.6
Other Income, Net                                           61.4            48.9           35.8           226.1            55.9
- -------------------------------------------------------------------------------------------------------------------------------
EBIT                                                      (702.0)          420.9          467.9           501.8           256.5
Interest Expense, Net                                     (126.2)          (97.2)         (88.9)          (97.1)          (77.3)
- -------------------------------------------------------------------------------------------------------------------------------
Income (Loss) Before Income Taxes                         (828.2)          323.7          379.0           404.7           179.2
Income Tax Expense (Loss)                                 (297.7)          105.7          123.2           136.2            23.5
- -------------------------------------------------------------------------------------------------------------------------------
Net Income (Loss)                                    $    (530.5)    $     218.0    $     255.8     $     268.5     $     155.7
===============================================================================================================================
Earnings (Loss) Per Share                            $     (4.82)    $      1.98    $      2.32     $      2.43     $      1.40
Earnings (Loss) Per Share - Assuming Dilution        $     (4.82)    $      1.95    $      2.29     $      2.41     $      1.39
Weighted Average Shares Outstanding (thousands)          110,020         110,099        110,370         110,428         111,278
Weighted Average Shares Outstanding -
 Assuming Dilution (thousands)                           110,020         111,669        111,722         111,261         112,228
Dividend Rate                                        $      1.08     $      1.08    $      1.08     $      1.08     $      1.08
===============================================================================================================================
Assets                                               $   4,361.1     $   5,252.1    $   4,362.8     $   4,013.3     $   3,885.1
Debt Maturing within One Year                              830.2           461.2          215.7           241.7           225.3
Long-Term Debt                                           1,099.5         1,236.0          979.7           804.6           993.4
Stockholders' Equity                                     1,329.3         1,961.8        1,876.0         1,716.1         1,548.9
- -------------------------------------------------------------------------------------------------------------------------------
Total Capitalization                                 $   3,259.0     $   3,659.0    $   3,071.4     $   2,762.4     $   2,767.6
===============================================================================================================================
</TABLE>

Note: The 1994-1997 periods have been restated to reflect the change to the full
cost method of accounting for the Company's oil and gas operations (see Note 2).






                                       30

<PAGE>   32
               (b) Pro forma financial information.

         Presented below are unaudited pro forma condensed combined financial
statements reflecting the all common stock merger using the pooling of interests
method of accounting and unaudited pro forma condensed combined financial
statements reflecting the alternative merger using the purchase method of
accounting. This information is included to give you a better understanding of
what the combined results of operations and financial position of El Paso Energy
and Sonat may have looked like had the merger occurred on an earlier date.

         The pro forma information reflecting the all common stock merger
assumes (1) each share of Sonat common stock will be converted into one share of
El Paso Energy common stock and (2) El Paso Energy will issue a total of
approximately 110 million shares in the merger.

         The pro forma information reflecting the alternative merger assumes (1)
each share of Sonat common stock will be converted into (x) .170 of a share of
El Paso Energy common stock and (y) .299 of a depositary share determined
assuming an implied price per share of El Paso Energy common stock of $36, (2)
El Paso Energy will issue in the alternative merger a total of 18.7 million
shares of common stock and 32.9 million depositary shares, which depositary
shares would entitle the holders thereof to receive up to $3.29 billion of value
if El Paso Energy were liquidated, (3) each share of El Paso Energy common stock
issued will have a value of $36 on completion of the alternative merger, and (4)
the annual dividend rate on the senior voting preferred stock will be 8.75%. The
actual dividend rate will be a rate that our and Sonat's financial advisors
believe will cause the depositary shares, when fully distributed after
completion of the alternative merger, to trade initially at approximately $100
per share, considering the pro forma capitalization and credit profile of the
combined company after the completion of the alternative merger. These unaudited
pro forma condensed combined financial statements should be read in conjunction
with the historical financial statements and related notes of El Paso Energy and
Sonat included in their respective Annual Reports on Form 10-K for the year
ended December 31, 1998. The historical financial information presented for
Sonat includes certain reclassifications to conform to El Paso Energy's
presentation. These reclassifications have no impact on net income or total
stockholders' equity.

         Accounting policy differences and intercompany balances between 
El Paso Energy and Sonat have been determined to be immaterial and, accordingly,
the pro forma condensed combined financial statements have not been adjusted for
those differences.

         The unaudited pro forma condensed combined financial statements are
presented for illustrative purposes only and are not necessarily indicative of
the operating results or financial position that would have been achieved had
the all common stock merger of El Paso Energy and Sonat under either structure
been consummated as of the beginning of the periods presented, nor are they
necessarily indicative of the future operating results or financial position of
El Paso Energy. The unaudited pro forma condensed combined financial statements
do not give effect to any operating efficiencies or cost savings that may result
from the integration of El Paso Energy's and Sonat's operations.

          UNAUDITED PRO FORMA CONDENSED COMBINED FINANCIAL INFORMATION
        REFLECTING COMPLETION OF THE MERGER ON AN ALL COMMON STOCK BASIS
                  (POOLING OF INTERESTS METHOD OF ACCOUNTING)

         The following unaudited pro forma condensed combined financial
statements give effect to the all common stock merger using the pooling of
interests method of accounting. Under this accounting method, El Paso Energy's
and Sonat's balance sheets and income statements are treated as if they had
always been combined for accounting and financial reporting purposes.

         The unaudited pro forma condensed combined balance sheet as of December
31, 1998 assumes the merger had been completed on December 31, 1998. The
unaudited pro forma condensed combined income statements for the three years
ended December 31, 1998 assume the merger had been completed on January 1, 1996,
the beginning of the earliest period presented.


                                       31
<PAGE>   33
              UNAUDITED PRO FORMA CONDENSED COMBINED BALANCE SHEET
        REFLECTING COMPLETION OF THE MERGER ON AN ALL COMMON STOCK BASIS
                  (POOLING OF INTERESTS METHOD OF ACCOUNTING)
                            AS OF DECEMBER 31, 1998
                                 (IN MILLIONS)
 
<TABLE>
<CAPTION>
                                              ASSETS

                                                      EL PASO
                                                       ENERGY      SONAT                     COMBINED
                                                     HISTORICAL   HISTORICAL   ADJUSTMENTS   PRO FORMA
                                                     ----------   ----------   -----------   ---------
<S>                                                  <C>          <C>          <C>           <C>
Total current assets...............................   $ 1,209       $  801        $  --       $ 2,010
Property, plant and equipment, net.................     7,341        2,696           --        10,037
Other..............................................     1,519          864           --         2,383
                                                      -------       ------        -----       -------
          Total assets.............................   $10,069       $4,361        $  --       $14,430
                                                      =======       ======        =====       =======
 
                                  LIABILITIES & STOCKHOLDERS' EQUITY
 
Total current liabilities..........................   $ 2,162       $1,577        $ 135(a)    $ 3,823
                                                                                    (51)(c)
                                                      -------       ------        -----       -------
Long-term debt, less current maturities............     2,552        1,099           --         3,651
                                                      -------       ------        -----       -------
Deferred income taxes..............................     1,564          164          (22)(c)     1,706
                                                      -------       ------        -----       -------
Other..............................................       993          183           --         1,176
                                                      -------       ------        -----       -------
Company-obligated mandatorily redeemable
  convertible preferred securities of El Paso
  Energy Capital Trust I...........................       325           --           --           325
                                                      -------       ------        -----       -------
Minority interest..................................       365            9           --           374
                                                      -------       ------        -----       -------
Stockholders' equity
  Common stock.....................................       373          111          219(b)        703
  Additional paid-in capital.......................     1,436           77         (279)(b)     1,234
  Retained earnings................................       460        1,210         (192)(a)     1,551
                                                                                     73(c)
  Other............................................      (161)         (69)          60(b)       (113)
                                                                                     57(a)
                                                      -------       ------        -----       -------
          Total stockholders' equity...............     2,108        1,329          (62)        3,375
                                                      -------       ------        -----       -------
          Total liabilities and stockholders'
            equity.................................   $10,069       $4,361        $  --       $14,430
                                                      =======       ======        =====       =======
</TABLE>

  See accompanying Notes to the Unaudited Pro Forma Condensed Combined Balance
                                     Sheet.

                                       32
<PAGE>   34
 
       NOTES TO THE UNAUDITED PRO FORMA CONDENSED COMBINED BALANCE SHEET
        REFLECTING COMPLETION OF THE MERGER ON AN ALL COMMON STOCK BASIS
                  (POOLING OF INTERESTS METHOD OF ACCOUNTING)
 
 
(a)  Reflects estimated costs of $192 million associated with the merger of El
     Paso Energy and Sonat. These costs consist of (1) $142 million of costs for
     compensation related programs under which certain benefits of El Paso
     Energy and Sonat personnel accelerate and vest as a result of the change in
     control associated with the all common stock merger and (2) $50 million of 
     transaction costs, which include legal, accounting, and financial advisory 
     services.
 
(b)  Reflects the exchange of one share of El Paso Energy common stock for each
     share of outstanding Sonat common stock, as provided in the merger
     agreement and the cancellation of $60 million of Sonat treasury stock.
 
(c)  Reflects the income tax consequences of the $192 million of costs 
     associated with the merger assuming an effective income tax rate of 38%.
 

                                       33
<PAGE>   35
 
           UNAUDITED PRO FORMA CONDENSED COMBINED STATEMENT OF INCOME
        REFLECTING COMPLETION OF THE MERGER ON AN ALL COMMON STOCK BASIS
                  (POOLING OF INTERESTS METHOD OF ACCOUNTING)
                      FOR THE YEAR ENDED DECEMBER 31, 1998
                  (IN MILLIONS, EXCEPT PER COMMON SHARE DATA)
 
<TABLE>
<CAPTION>
                                                      EL PASO
                                                       ENERGY       SONAT                    COMBINED
                                                     HISTORICAL   HISTORICAL   ADJUSTMENTS   PRO FORMA
                                                     ----------   ----------   -----------   ---------
<S>                                                  <C>          <C>          <C>           <C>
Operating revenues.................................    $5,782       $3,710         $--        $9,492
                                                       ------       ------         ---        ------
Operating expenses
  Cost of gas and other products...................     4,212        2,745          --         6,957
  Operation and maintenance........................       707          281          --           988
  Depreciation, depletion and amortization.........       269          349          --           618
  Ceiling test charges.............................        --        1,035          --         1,035
  Other............................................        88           63          --           151
                                                       ------       ------         ---        ------
                                                        5,276        4,473          --         9,749
                                                       ------       ------         ---        ------
Operating income (loss)............................       506         (763)         --          (257)
Interest and debt expense..........................       267          137          --           404
Other income, net..................................      (138)         (67)         --          (205)
                                                       ------       ------         ---        ------
Income (loss) before income taxes and minority
  interest.........................................       377         (833)         --          (456)
Income tax expense (benefit).......................       127         (299)         --          (172)
                                                       ------       ------         ---        ------
Income (loss) before minority interest.............       250         (534)         --          (284)
Minority interest..................................        25           (3)         --            22
                                                       ------       ------         ---        ------
Net income (loss)..................................    $  225       $ (531)        $--        $ (306)
                                                       ======       ======         ===        ======
Basic earnings (loss) per common share.............    $ 1.94                                 $(1.35)
                                                       ======                                 ======
Diluted earnings (loss) per common share...........    $ 1.85                                 $(1.35)(a)
                                                       ======                                 ======
Basic average common shares outstanding............       116                      110(b)        226
                                                       ======                      ===        ======
Diluted average common shares outstanding..........       126                      111(b)        237
                                                       ======                      ===        ======
</TABLE>
 
 See accompanying Notes to the Unaudited Pro Forma Condensed Combined 
                              Statements of Income.
 

                                       34
<PAGE>   36
 
           UNAUDITED PRO FORMA CONDENSED COMBINED STATEMENT OF INCOME
      REFLECTING THE COMPLETION OF THE MERGER ON AN ALL COMMON STOCK BASIS
                  (POOLING OF INTERESTS METHOD OF ACCOUNTING)
                      FOR THE YEAR ENDED DECEMBER 31, 1997
                  (IN MILLIONS, EXCEPT PER COMMON SHARE DATA)
 
<TABLE>
<CAPTION>
                                                      EL PASO
                                                       ENERGY       SONAT                    COMBINED
                                                     HISTORICAL   HISTORICAL   ADJUSTMENTS   PRO FORMA
                                                     ----------   ----------   -----------   ---------
<S>                                                  <C>          <C>          <C>           <C>
Operating revenues.................................    $5,638       $4,372         $--        $10,010
                                                       ------       ------         ---        -------
Operating expenses
  Cost of gas and other products...................     4,125        3,174          --          7,299
  Operation and maintenance........................       664          385          --          1,049
  Depreciation, depletion and amortization.........       236          398          --            634
  Other............................................        92           43          --            135
                                                       ------       ------         ---        -------
                                                        5,117        4,000          --          9,117
                                                       ------       ------         ---        -------
Operating income...................................       521          372          --            893
Interest and debt expense..........................       238          110          --            348
Other income, net..................................       (57)         (66)         --           (123)
                                                       ------       ------         ---        -------
Income before income taxes and minority interest...       340          328          --            668
Income tax expense.................................       129          107          --            236
                                                       ------       ------         ---        -------
Income before minority interest....................       211          221          --            432
Minority interest..................................        25            3          --             28
                                                       ------       ------         ---        -------
Net income.........................................    $  186       $  218         $--        $   404
                                                       ======       ======         ===        =======
Basic earnings per common share....................    $ 1.64                                 $  1.80
                                                       ======                                 =======
Diluted earnings per common share..................    $ 1.59                                 $  1.76
                                                       ======                                 =======
Basic average common shares outstanding............       114                      110(b)         224
                                                       ======                      ===        =======
Diluted average common shares outstanding..........       117                      112(b)         229
                                                       ======                      ===        =======
</TABLE>
 
 See accompanying Notes to the Unaudited Pro Forma Condensed Combined 
                             Statements of Income.

 
                                       35

<PAGE>   37
 
           UNAUDITED PRO FORMA CONDENSED COMBINED STATEMENT OF INCOME
        REFLECTING COMPLETION OF THE MERGER ON AN ALL COMMON STOCK BASIS
                  (POOLING OF INTERESTS METHOD OF ACCOUNTING)
                      FOR THE YEAR ENDED DECEMBER 31, 1996
                  (IN MILLIONS, EXCEPT PER COMMON SHARE DATA)
 
<TABLE>
<CAPTION>
                                                      EL PASO
                                                       ENERGY       SONAT                    COMBINED
                                                     HISTORICAL   HISTORICAL   ADJUSTMENTS   PRO FORMA
                                                     ----------   ----------   -----------   ---------
<S>                                                  <C>          <C>          <C>           <C>
Operating revenues.................................    $3,012       $3,204         $--        $6,216
                                                       ------       ------         ---        ------
Operating expenses
  Cost of gas and other products...................     2,277        2,039          --         4,316
  Operation and maintenance........................       322          301          --           623
  Depreciation, depletion and amortization.........       101          384          --           485
  Employee separation and asset impairment
     charge........................................        99           --          --            99
  Other............................................        43           48          --            91
                                                       ------       ------         ---        ------
                                                        2,842        2,772          --         5,614
                                                       ------       ------         ---        ------
Operating income...................................       170          432          --           602
Interest and debt expense..........................       110          101          --           211
Other income, net..................................        (5)         (53)         --           (58)
                                                       ------       ------         ---        ------
Income before income taxes and minority interest...        65          384          --           449
Income tax expense.................................        25          125          --           150
                                                       ------       ------         ---        ------
Income before minority interest....................        40          259          --           299
Minority interest..................................         2            3          --             5
                                                       ------       ------         ---        ------
Net income.........................................    $   38       $  256         $--        $  294
                                                       ======       ======         ===        ======
Basic earnings per common share....................    $ 0.53                                 $ 1.62
                                                       ======                                 ======
Diluted earnings per common share..................    $ 0.52                                 $ 1.59
                                                       ======                                 ======
Basic average common shares outstanding............        72                      110(b)        182
                                                       ======                      ===        ======
Diluted average common shares outstanding..........        73                      112(b)        185
                                                       ======                      ===        ======
</TABLE>
 
 See accompanying Notes to the Unaudited Pro Forma Condensed Combined Statements
                                   of Income
 

                                       36

<PAGE>   38
 
    NOTES TO THE UNAUDITED PRO FORMA CONDENSED COMBINED STATEMENTS OF INCOME
        REFLECTING COMPLETION OF THE MERGER ON AN ALL COMMON STOCK BASIS
                  (POOLING OF INTERESTS METHOD OF ACCOUNTING)
 

(a)  As required by the accounting rules, we have excluded additional dilutive
     securities such as options in determining diluted earnings (loss) per
     common share. If we had included those securities, we would have shown
     less of a loss per common share.
 
(b)  The basic and diluted average common share adjustments reflect the exchange
     of one share of El Paso Energy common stock for each share of Sonat common
     stock contemplated by the merger agreement.
 

                                       37
<PAGE>   39
 
          UNAUDITED PRO FORMA CONDENSED COMBINED FINANCIAL INFORMATION
   REFLECTING COMPLETION OF THE MERGER UNDER THE ALTERNATIVE MERGER STRUCTURE
                        (PURCHASE METHOD OF ACCOUNTING)
 
     The following unaudited pro forma condensed combined financial statements
give effect to the merger under the alternative merger structure using the
purchase method of accounting. 

     In accordance with the purchase method of accounting, we have reflected
Sonat's assets and liabilities on the following pro forma financial statements,
and have allocated to those assets and liabilities the total value of the shares
that would be issued in the alternative merger structure, based on our estimate
of what the fair value of those assets and liabilities will be when the merger
is completed. Our estimates of the fair value and allocations are preliminary
and may be revised after the completion of independent appraisals, which have
not yet been performed. To the extent the total value of the shares issued in
the merger exceeds the fair value of Sonat's identified assets and liabilities,
we will record the excess as "goodwill" for accounting purposes.
 
     The unaudited pro forma condensed combined balance sheet as of December 31,
1998 assumes the merger had been completed on December 31, 1998. The unaudited
pro forma condensed combined statement of income for the year ended December 31,
1998 assumes the merger had been completed on January 1, 1998.
 

                                       38
<PAGE>   40
 
              UNAUDITED PRO FORMA CONDENSED COMBINED BALANCE SHEET
   REFLECTING COMPLETION OF THE MERGER UNDER THE ALTERNATIVE MERGER STRUCTURE
                        (PURCHASE METHOD OF ACCOUNTING)
                            AS OF DECEMBER 31, 1998
                                 (IN MILLIONS)

<TABLE>
<CAPTION>
                                     ASSETS
                                                       EL PASO
                                                        ENERGY       SONAT                      COMBINED
                                                      HISTORICAL   HISTORICAL   ADJUSTMENTS     PRO FORMA
                                                      ----------   ----------   -----------     ---------
<S>                                                   <C>          <C>          <C>             <C>
Total current assets................................   $ 1,209       $  801       $    --        $ 2,010
Property, plant and equipment, net..................     7,341        2,696         4,368(a)      13,963
                                                                                     (442)(b)
Other...............................................     1,519          864            --          2,383
                                                       -------       ------       -------        -------
          Total assets..............................   $10,069       $4,361       $ 3,926        $18,356
                                                       =======       ======       =======        =======

                                   LIABILITIES & STOCKHOLDERS' EQUITY

Total current liabilities...........................   $ 2,162       $1,577       $    72(c)     $ 3,784
                                                                                      (27)(e)
                                                       -------       ------       -------        -------
Long-term debt, less current maturities.............     2,552        1,099            49(a)       3,700
                                                       -------       ------       -------        -------
Deferred income taxes...............................     1,564          164         1,473(e)       3,201
                                                       -------       ------       -------        -------
Other...............................................       993          183            --          1,176
                                                       -------       ------       -------        -------
Company-obligated mandatorily redeemable convertible
  preferred securities of El Paso Energy Capital
  Trust I...........................................       325           --            --            325
                                                       -------       ------       -------        -------
Mandatorily redeemable preferred stock..............        --           --         3,288(f)       3,288
                                                       -------       ------       -------        -------
Minority interest...................................       365            9            --            374
                                                       -------       ------       -------        -------
Stockholders' equity
  Common stock......................................       373          111          (111)(d)        429
                                                                                       56(f)
  Additional paid-in capital........................     1,436           77           (77)(d)      2,054
                                                                                      618(f)
  Retained earnings.................................       460        1,210        (1,210)(d)        186
                                                                                     (442)(b)
                                                                                      168(e)
  Other.............................................      (161)         (69)           69(d)        (161)
                                                       -------       ------       -------        -------
          Total stockholders' equity................     2,108        1,329          (929)         2,508
                                                       -------       ------       -------        -------
          Total liabilities and stockholders'
            equity..................................   $10,069       $4,361       $ 3,926        $18,356
                                                       =======       ======       =======        =======
</TABLE>
 
               See accompanying Notes to the Unaudited Pro Forma
                       Condensed Combined Balance Sheet.
 

                                       39
<PAGE>   41
 
       NOTES TO THE UNAUDITED PRO FORMA CONDENSED COMBINED BALANCE SHEET
   REFLECTING COMPLETION OF THE MERGER UNDER THE ALTERNATIVE MERGER STRUCTURE
                        (PURCHASE METHOD OF ACCOUNTING)
 

(a)  Reflects the preliminary allocation of the total value of the shares issued
     to Sonat stockholders under the alternative merger structure to Sonat's
     assets and liabilities.
 
(b)  Reflects the writedown of the purchase price allocated to proven reserves
     as a result of applying the full cost ceiling limitations. This writedown
     has not been considered in the pro forma condensed combined statement of
     income because it reflects a nonrecurring charge which would result
     directly from the merger and which would be included in the income
     statement during the period in which the merger is completed.
 
(c)  Reflects estimated costs of $72 million associated with the merger of El
     Paso Energy and Sonat under the alternative merger structure. These costs
     consist of (1) $22 million of compensation related costs associated with
     certain benefits of Sonat personnel which accelerate and vest as a result
     of the change in control associated with the merger and (2) $50 million of
     transaction costs, which include legal, accounting and financial advisory
     services.
 
(d)  Reflects the elimination of the historical equity of Sonat.
 
(e)  Reflects the income tax consequences of the pro forma adjustments assuming
     an effective income tax rate of 38%.
 
(f)  Reflects the issuance of approximately 18.7 million shares of El Paso
     Energy common stock assuming each share of El Paso Energy common stock
     issued will have a value of $36 on completion of the alternative merger and
     the issuance of 32.9 million depositary shares (determined assuming an
     implied price per share of El Paso common stock of $36) representing newly
     issued senior voting preferred stock having an aggregate liquidation
     preference of $3.29 billion and an annual dividend rate of 8.75%. The
     actual dividend rate will be set at a rate that our financial advisors
     believe will cause the depositary shares, when fully distributed after
     completion of the alternative merger, to trade initially at approximately
     $100 per share, considering the pro forma capitalization and credit profile
     of the combined company after completion of the alternative merger.

                                       40
<PAGE>   42
 
           UNAUDITED PRO FORMA CONDENSED COMBINED STATEMENT OF INCOME
   REFLECTING COMPLETION OF THE MERGER UNDER THE ALTERNATIVE MERGER STRUCTURE
                        (PURCHASE METHOD OF ACCOUNTING)
                      FOR THE YEAR ENDED DECEMBER 31, 1998
                  (IN MILLIONS, EXCEPT PER COMMON SHARE DATA)

<TABLE>
<CAPTION>
                                                      EL PASO
                                                       ENERGY       SONAT                    COMBINED
                                                     HISTORICAL   HISTORICAL   ADJUSTMENTS   PRO FORMA
                                                     ----------   ----------   -----------   ---------
<S>                                                  <C>          <C>          <C>           <C>
Operating revenues.................................    $5,782       $3,710        $  --       $9,492
                                                       ------       ------        -----       ------
Operating expenses
  Cost of gas and other products...................     4,212        2,745           --        6,957
  Operation and maintenance........................       707          281           --          988
  Depreciation, depletion and amortization.........       269          349           88(a)       706
  Ceiling test charges.............................        --        1,035           --        1,035
  Other............................................        88           63           --          151
                                                       ------       ------        -----       ------
                                                        5,276        4,473           88        9,837
                                                       ------       ------        -----       ------
Operating income (loss)............................       506         (763)         (88)        (345)
Interest and debt expense..........................       267          137           --          404
Other income, net..................................      (138)         (67)          --         (205)
                                                       ------       ------        -----       ------
Income (loss) before income taxes and minority
  interest.........................................       377         (833)         (88)        (544)
Income tax expense (benefit).......................       127         (299)         (33)(b)     (205)
                                                       ------       ------        -----       ------
Income (loss) before minority interest.............       250         (534)         (55)        (339)
Minority interest..................................        25           (3)          --           22
                                                       ------       ------        -----       ------
Net income (loss) before preferred stock dividend
  requirement......................................       225         (531)         (55)        (361)
Preferred stock dividend requirement...............        --           --          288(c)       288
                                                       ------       ------        -----       ------
Net income (loss) available to common
  stockholders.....................................    $  225       $ (531)       $(343)      $ (649)(e)
                                                       ======       ======        =====       ======
Basic earnings (loss) per common share.............    $ 1.94                                 $(4.81)(e)
                                                       ======                                 ======
Diluted earnings (loss) per common share...........    $ 1.85                                 $(4.81)(d)(e)
                                                       ======                                 ======
Basic average common shares outstanding............       116                        19(d)       135
                                                       ======                     =====       ======
Diluted average common shares outstanding..........       126                        24(d)       150
                                                       ======                     =====       ======
</TABLE>
 
 See accompanying Notes to the Unaudited Pro Forma Condensed Combined 
                              Statement of Income.
 

                                       41
<PAGE>   43
 
    NOTES TO THE UNAUDITED PRO FORMA CONDENSED COMBINED STATEMENT OF INCOME
   REFLECTING COMPLETION OF THE MERGER UNDER THE ALTERNATIVE MERGER STRUCTURE
                        (PURCHASE METHOD OF ACCOUNTING)
 

(a)  Reflects depreciation expense related to the portion of the total value of
     the shares issued to Sonat stockholders allocated to property, plant and
     equipment based on an estimated life of 40 years, which approximates the
     regulatory lives of Sonat's pipelines.
 
(b)  Reflects the income tax consequences of the pro forma adjustment assuming
     an effective income tax rate of 38%.
 
(c)  Reflects an annual dividend rate of 8.75% for senior voting preferred stock
     which would be issued by El Paso Energy pursuant to the alternative merger
     structure. The actual dividend rate will be set at a rate that our
     financial advisors believe will cause the depositary shares, when fully
     distributed after completion of the alternative merger, to trade initially
     at approximately $100 per share, considering the pro forma capitalization
     and credit profile of the combined company after completion of the
     alternative merger. Each percentage point change in the assumed annual
     dividend rate would impact the senior voting preferred stock dividend by
     approximately $33 million.
 
(d)  The basic and diluted common shares adjustments reflect the issuance of (1)
     18.7 million and 24 million shares, respectively, of El Paso Energy common
     stock, with each share having a value of $36 on completion of the
     alternative merger and (2) the issuance of 32.9 million shares of senior
     voting preferred stock having an aggregate liquidation preference of $3.29
     billion and an annual dividend rate of 8.75%. As required by the accounting
     rules, we have excluded additional dilutive securities such as options in
     determining diluted earnings (loss) per common share. If we had included
     those securities, we would have shown less of a loss per common share.
 
(e)  In calculating net income (loss) available to common stockholders, basic
     earnings (loss) per common share, and diluted earnings (loss) per common
     share, we assumed an implied price per share of El Paso Energy common stock
     of $36 for purposes of determining the fraction of a depositary share to be
     exchanged for each share of Sonat common stock. Each one dollar increase
     (or decrease) to this assumed implied price per share would increase (or
     decrease) net loss available to common stockholders, basic loss per common 
     share and diluted loss per common share by $11 million, $.08 per share and 
     $.08 per share, respectively.


                                       42
<PAGE>   44
(c) Exhibits.

    12.1 -- Ratio of earnings to combined fixed charges and preferred stock 
            dividends.

    23.1 -- Consent of Ernst & Young LLP, Independent Auditors

    23.2 -- Consent of KPMG LLP, Independent Auditors


                                       43
<PAGE>   45


                                    SIGNATURE

       Pursuant to the requirements of the Securities Exchange Act of 1934, as
amended, the registrant has duly caused this report to be signed on its behalf
by the undersigned thereunto duly authorized.



                                          EL PASO ENERGY CORPORATION



                                          By: /s/ JEFFREY I. BEASON
                                             ----------------------------------
                                                  Jeffrey I. Beason
                                                  Vice President and Controller
                                                  (Chief Accounting Officer)


Date: April 30, 1999




                                       44
<PAGE>   46
                               INDEX TO EXHIBITS

   Exhibit
   Number                         Description
   -------                        -----------

    12.1 -- Ratio of earnings to combined fixed charges and preferred stock 
            dividends.

    23.1 -- Consent of Ernst & Young LLP, Independent Auditors

    23.2 -- Consent of KPMG LLP, Independent Auditors


<PAGE>   1
 
                                                                    EXHIBIT 12.1
 
                           EL PASO ENERGY CORPORATION
 
                  COMPUTATION OF EARNINGS TO FIXED CHARGES AND
                RATIO OF EARNINGS TO COMBINED FIXED CHARGES AND
              PREFERRED AND PREFERENCE STOCK DIVIDEND REQUIREMENTS
 
<TABLE>
<CAPTION>
                                                            FOR THE YEAR ENDED DECEMBER 31,
                                                  ----------------------------------------------------
                                                      1998       1998    1997    1996    1995    1994
                                                  ------------   -----   -----   -----   -----   -----
                                                                 (DOLLARS IN MILLIONS)
                                                     PRO FORMA
                                                  ASSUMING THE
                                                   ALTERNATIVE
                                                        MERGER
                                                     STRUCTURE                HISTORICAL
                                                  ------------   -------------------------------------
<S>                                               <C>            <C>     <C>     <C>     <C>     <C>
Earnings
  Income (loss) from continuing operations......     $(361)      $ 225   $ 186   $  38   $  85   $  90
  Income tax expense (benefit)..................      (205)        127     129      25      48      58
  Minority interest.............................        22          25      25       2       0       0
                                                     -----       -----   -----   -----   -----   -----
  Income (loss) from continuing operations
     before income taxes and minority
     interest...................................      (544)        377     340      65     133     148
  Interest and debt expense.....................       404         262     218     100      85      76
  Interest component of rentals.................        17           9       7       5       3       3
  Distributions in excess of earnings on equity
     investments (undistributed earnings on
     equity investments)........................       (66)        (28)     --      --      --      --
                                                     -----       -----   -----   -----   -----   -----
          Total earnings (losses) available for
            fixed charges.......................     $(189)      $ 620   $ 565   $ 170   $ 221   $ 227
                                                     =====       =====   =====   =====   =====   =====
Fixed charges
  Interest and debt expense.....................     $ 404       $ 262   $ 218   $ 100   $  85   $  76
  Interest components of rentals................        17           9       7       5       3       3
                                                     -----       -----   -----   -----   -----   -----
  Fixed charges excluding preferred stock
     dividend requirement.......................       421         271     225     105      88      79
  Preferred stock dividend requirements.........       502          37      25       2      --      --
                                                     -----       -----   -----   -----   -----   -----
          Total fixed charges...................     $ 923       $ 308   $ 250   $ 107   $  88   $  79
                                                     =====       =====   =====   =====   =====   =====
Ratio of Earnings to Fixed Charges(1)...........        --(2)     2.01    2.26    1.59    2.51    2.87
                                                     =====       =====   =====   =====   =====   =====
</TABLE>
 
- ---------------
 
(1)  The ratio of earnings to combined fixed charges and preferred and
     preference stock dividend requirements for the periods presented is the
     same as the ratio of earnings to fixed charges since El Paso Energy has no
     outstanding preferred stock or preference stock and, therefore, no dividend
     requirements.
 
(2)  Earnings were inadequate to cover fixed charges by $1,112 million.
 
     For purposes of calculating these ratios: (i) "fixed charges" represent
interest cost (exclusive of interest on rate refunds), amortization of debt
costs, the estimated portion of rental expense representing the interest factor,
and pretax preferred stock dividend requirements; and (ii) "earnings" represent
the aggregate of income from continuing operations before income taxes, interest
expense (exclusive of interest on rate refunds), amortization of debt costs, the
portion of rental expense representing the interest factor, and the actual
amount of any preferred stock dividend requirements, adjusted to reflect actual
distributions from equity investments.

<PAGE>   1
                                                                    EXHIBIT 23.1


                        CONSENT OF INDEPENDENT AUDITORS

We consent to the use of our report dated January 19, 1999, with respect to the
consolidated financial statements of Sonat Inc. for the year ended December 31,
1998 included in Amendment No. 1 to the El Paso Energy Corporation Current
Report on Form 8-K/A dated April 30, 1999 filed with the Securities and Exchange
Commission.


                                                  
                                                  /s/ ERNST & YOUNG LLP
                                                  ERNST & YOUNG LLP

Birmingham, Alabama
April 28, 1999

<PAGE>   1
                                                                    EXHIBIT 23.2


                         CONSENT OF INDEPENDENT AUDITORS


The Board of Directors
Sonat Exploration GOM Inc.
(formerly Zilkha Energy Company):

We consent to the incorporation by reference in the Form 8-K of El Paso Energy 
Corporation anticipated to be filed on April 30, 1999, of our report dated 
December 8, 1997, with respect to the Statements of Operations and Cash Flows 
of Zilkha Energy Company for the year ended December 31, 1996, which report 
appears in the Form 8-K of Sonat Inc. dated April 23, 1998 and is incorporated 
by reference in the Form 10-K of Sonat Inc. for the year ended December 31, 
1998.

Our report, dated December 8, 1997, refers to a change in accounting for oil 
and gas properties from the full cost method to the successful efforts method.


                                                 /s/ KPMG LLP
                                                     KPMG LLP

Houston, Texas
April 26, 1999


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