NICOR INC
DEF 14A, 1997-03-07
NATURAL GAS DISTRIBUTION
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<PAGE>   1
 
                                  SCHEDULE 14A
                                 (RULE 14a-101)
                    INFORMATION REQUIRED IN PROXY STATEMENT
                            
                           SCHEDULE 14A INFORMATION
          PROXY STATEMENT PURSUANT TO SECTION 14(a) OF THE SECURITIES
                     EXCHANGE ACT OF 1934 (AMENDMENT NO.  )
 
     Filed by the registrant /X/
 
     Filed by a party other than the registrant / /
 
     Check the appropriate box:
 
     / / Preliminary proxy statement        / / Confidential, for Use of the
                                                Commission Only (as permitted by
                                                Rule 14a-6(e)(2))
 
     /X/ Definitive proxy statement
 
     / / Definitive additional materials
 
     / / Soliciting material pursuant to Rule 14a-11(c) or Rule 14a-12

                                 NICOR INC.
- --------------------------------------------------------------------------------
                (Name of Registrant as Specified in Its Charter)

- --------------------------------------------------------------------------------
    (Name of Person(s) Filing Proxy Statement, if other than the Registrant)
 
Payment of filing fee (Check the appropriate box):
 
     / / $125 per Exchange Act Rule 0-11(c)(1)(ii), 14a-6(i)(1), or 14a-6(j)(2)
or Item 22(a)(2) of Schedule 14A.
 
     / / $500 per each party to the controversy pursuant to Exchange Act Rule
14a-6(i)(3).
 
     / / Fee computed on table below per Exchange Act Rules 14a-6(i)(4) and
0-11.
 
     (1) Title of each class of securities to which transaction applies:
 
- --------------------------------------------------------------------------------
 
     (2) Aggregate number of securities to which transaction applies:
 
- --------------------------------------------------------------------------------
 
     (3) Per unit price or other underlying value of transaction computed
pursuant to Exchange Act Rule 0-11 (Set forth the amount on which the filing fee
is calculated and state how it was determined):
 
- --------------------------------------------------------------------------------
 
     (4) Proposed maximum aggregate value of transaction:
 
- --------------------------------------------------------------------------------
 
     (5) Total fee paid:
 
- --------------------------------------------------------------------------------
 
     / / Fee paid previously with preliminary materials.
 
- --------------------------------------------------------------------------------
 
     / / Check box if any part of the fee is offset as provided by Exchange Act
Rule 0-11(a)(2) and identify the filing for which the offsetting fee was paid
previously. Identify the previous filing by registration statement number, or
the form or schedule and the date of its filing.
 
     (1) Amount previously paid:
 
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     (2) Form, schedule or registration statement no.:
 
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     (3) Filing party:
 
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     (4) Date filed:
 
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<PAGE>   2
 
                                   NICOR INC.
                 P.O. BOX 3014, NAPERVILLE, ILLINOIS 60566-7014
                                  630/305-9500
 
                    NOTICE OF ANNUAL MEETING OF STOCKHOLDERS
 
                                 APRIL 17, 1997
 
The Annual Meeting of Stockholders of NICOR Inc. will be held at The Northern
Trust Company, 6th Floor Assembly Room, 50 South LaSalle Street, Chicago,
Illinois, on Thursday, April 17, 1997, at 10:30 a.m. Central Daylight Saving
Time, for the following purposes, all as set forth in the accompanying proxy
statement:
 
     (1) election of a Board of Directors; and
 
     (2) approval of the NICOR Inc. 1997 Long-Term Incentive Plan.
 
Only stockholders of record on the books of the company at the close of business
on February 17, 1997, will be entitled to vote at the meeting. The stock
transfer books will not be closed.
 
                                          DAVID L. CYRANOSKI
                                          Senior Vice President,
                                          Secretary and Controller
March 6, 1997
 
                                   IMPORTANT
 
   The company has approximately 40,000 registered stockholders. In order
   that there may be a proper representation at the meeting, you are urged to
   vote, sign and mail all proxies you receive even though you plan to
   attend. If you attend the meeting you may vote personally on all matters
   brought before the meeting.
 
   Your prompt action in returning your proxy will be greatly appreciated. A
   return envelope, requiring no postage if mailed in the United States, is
   enclosed for your convenience.
<PAGE>   3
 
The Northern Trust Company is located at 50 South LaSalle Street, the northwest
corner of LaSalle and Monroe Streets. The map below shows parking garages and
lots in the immediate vicinity.
 
                          [Parking Garages & Lots Map]
<PAGE>   4
 
                                PROXY STATEMENT
 
This Proxy Statement is furnished in connection with the solicitation of proxies
by the Board of Directors of NICOR Inc., P.O. Box 3014, Naperville, Illinois
60566-7014, for use at the Annual Meeting of Stockholders to be held on April
17, 1997. The cost of soliciting proxies will be borne by the company. In
addition to solicitation by mail, officers and regular employees of the company
may solicit proxies by telephone, by facsimile or in person. A copy of the
company's 1996 Annual Report, the Proxy Statement and the Form of Proxy is
scheduled to be mailed on or about March 6, 1997, to all stockholders of record
on February 17, 1997.
 
                                     VOTING
 
As of February 17, 1997, the company had outstanding 49,309,837 shares of Common
Stock, par value $2.50 per share, and 149,006 shares of Preferred Stock, par
value $50.00 per share. Each share outstanding on the record date for the
meeting, regardless of class, entitles the holder thereof to one vote upon each
matter to be voted upon at the meeting. Stockholders have cumulative voting
rights in the election of Directors. For each share of stock owned, a
stockholder is entitled to one vote for each Director nominee and may accumulate
the total number of votes (determined by multiplying the number of shares held
by the number of Directors to be elected) and cast them all for a single nominee
or distribute them among any number of nominees. A majority of the outstanding
shares of the company will constitute a quorum for purposes of the meeting. If a
quorum is present, in person or by proxy, the affirmative vote of the majority
of the shares represented at the meeting and entitled to vote on the election of
Directors will be required for the election of Directors. As a result, shares
represented at the meeting and entitled to vote for Directors, but which
withhold votes for Directors, will in effect be counted against the election,
while shares held in the name of a broker which are represented at the meeting
but not authorized to vote on this matter ("broker nonvotes") will not affect
the outcome. The affirmative vote of a majority of the shares represented at the
meeting and entitled to vote thereon will be required to approve the NICOR Inc.
1997 Long-Term Incentive Plan (the "1997 Plan") (Item 2). Shares represented at
the meeting which abstain from voting on the 1997 Plan will have the effect of
votes against the 1997 Plan, while broker nonvotes will not affect the outcome.
 
Any stockholder giving a proxy will have the right to revoke it at any time
prior to the voting thereof by giving written notice to the Secretary of the
company. All shares represented by valid proxies will be voted at the meeting or
at any adjournment thereof as directed by the stockholders. In the absence of
specific direction to the contrary, the shares represented by valid proxies will
be voted FOR the election as Directors of all nominees herein named and, unless
otherwise specified, FOR approval of the NICOR Inc. 1997 Long-Term Incentive
Plan. In the event that any Director nominee shall be unable to serve, which is
not now contemplated, the proxy holders may, but need not, vote for a substitute
nominee. If stockholders withhold authority to vote for specific nominees, the
proxies may accumulate such votes and cast them for other nominees. While the
Board of Directors does not otherwise presently anticipate cumulating votes
pursuant to proxies it obtains as a result of this solicitation, it reserves the
discretionary authority to accumulate such votes and vote for less than all of
the nominees named herein.
<PAGE>   5
 
ITEM 1.  ELECTION OF DIRECTORS
 
The Directors to be elected are to hold office until the next succeeding annual
meeting of stockholders or until their successors are elected and qualified.
 
NOMINEES
 
The names of the nominees are set forth below along with their business
experience during the last five years and other directorships currently held,
including directorships with companies whose securities are registered with the
Securities and Exchange Commission. Each Director will also be a Director of
Northern Illinois Gas Company, a subsidiary of NICOR Inc.
 
<TABLE>
<S>                    <C>
 
                       ROBERT M. BEAVERS, JR.; Age 53
[PHOTO]                Director since 1992
                       Business experience:  Senior Vice President since 1980 as
                            well as Zone Manager 1980-1993, McDonald's Corporation
                            (Restaurants).
                       Directorship:  McDonald's Corporation.
 
                       BRUCE P. BICKNER; Age 53
[PHOTO]                Director since 1996
                       Business experience:  Chairman of the Board and Chief
                            Executive Officer since 1988, DEKALB Genetics
                            Corporation (Agricultural Genetics and Technology) as
                            well as Chairman of the Board, 1988-1995, DEKALB Energy
                            Company (Gas and Oil Exploration and Production).
                       Directorships:  Castle Bancgroup Inc.; DEKALB Genetics
                       Corporation.
</TABLE>
 
                                        2
<PAGE>   6

                 JOHN H. BIRDSALL, III; Age 53
[PHOTO]          Director since 1982
                 Business experience:  Private Investor; formerly President,
                      1982-1986, Birdsall, Inc., a subsidiary of NICOR Inc.
                      (Containerized Shipping).

                 W. H. CLARK; Age 64
[PHOTO]          Director since 1989
                 Business experience:  Retired; formerly Chairman of the
                      Board, 1984-1994, and Chief Executive Officer,
                      1982-1994, Nalco Chemical Company (Specialty Chemicals
                      and Services).
                 Directorships:  Bethlehem Steel Corporation; James River
                      Corporation; Merrill Lynch & Company, Inc.; Millennium
                      Chemicals Inc.; Ultramar Diamond Shamrock Corporation;
                      USG Corporation.

                 THOMAS L. FISHER; Age 52
[PHOTO]                 Director since 1988
                 Business experience:  Chairman of the Board since 1996,
                      Chief Executive Officer since 1995 and President and
                      Chief Operating Officer since 1994, NICOR Inc., as well
                      as President and Chief Executive Officer since 1988,
                      Northern Illinois Gas Company.

                                  3
<PAGE>   7

                 JOHN E. JONES; Age 62
 [PHOTO]         Director since 1993
                 Business experience:  Retired; formerly Chairman of the
                      Board and Chief Executive Officer, 1989-1996, as well
                      as President and Chief Operating Officer, 1988-1996,
                      CBI Industries, Inc. (Industrial Construction).
                 Directorships:  Allied Products Corporation; Amsted
                      Industries, Inc.; Interlake Corporation; Valmont
                      Industries, Inc.

                 DENNIS J. KELLER; Age 55
 [PHOTO]         Director since 1994
                 Business experience:  Chairman of the Board and Chief
                      Executive Officer since 1987, DeVry Inc., as well as
                      Chairman of the Board and Chief Executive Officer since
                      1981, Keller Graduate School of Management (Technical
                      and Management Education).
                 Directorship:  DeVry Inc.

                 CHARLES S. LOCKE; Age 68
 [PHOTO]         Director since 1982
                 Business experience:  Retired; formerly Chairman of the
                      Board and Chief Executive Officer, 1989-1994, Morton
                      International, Inc. (Specialized Chemicals, Automotive
                      Safety Products and Salt).
                 Directorships:  Avon Products, Inc.; Thiokol Corporation;
                 Whitman Corporation.

                                        4
<PAGE>   8

                 SIDNEY R. PETERSEN; Age 66
 [PHOTO]         Director since 1987
                 Business experience:  Retired; formerly Chairman of the
                      Board and Chief Executive Officer, 1980-1984, Getty Oil
                      Company (Integrated Petroleum).
                 Directorships:  Avery Dennison Corporation; Group
                      Technologies Corporation; Seagull Energy Corporation;
                      Union Bank of California.

                 DANIEL R. TOLL; Age 69
 [PHOTO]         Director since 1986
                 Business experience:  Corporate and civic director; formerly
                      President, 1980-1985, Walter E. Heller International
                      Corporation (Financial Services).
                 Directorships:  Brown Group, Inc.; A. P. Green Industries,
                      Inc.; Kemper National Insurance Companies; Lincoln
                      National Convertible Securities Fund, Inc.; Lincoln
                      National Income Fund, Inc.; Mallinckrodt Inc.

                 PATRICIA A. WIER; Age 59
 [PHOTO]         Director since 1990
                 Business experience:  Faculty, University of Chicago
                      Graduate School of Business since 1995, as well as
                      independent business consultant since 1994; formerly
                      President, 1986-1993, Encyclopaedia Britannica North
                      America, a division of Encyclopaedia Britannica, Inc.
                      (Publishing).

BOARD AND COMMITTEE MEETINGS
 
The NICOR Board has an Audit Committee, a Compensation Committee and a Committee
on Directors. During 1996, there were six meetings of the Board of Directors,
four meetings of the Audit Committee, five meetings of the Compensation
Committee and two meetings of the Committee on Directors. All incumbent
 
                                        5
<PAGE>   9
 
Directors attended more than 75% of the aggregate number of meetings of the
Board and Committees on which they served, except Mr. Bickner, who attended 71%.
 
COMMITTEES
 
The Audit Committee, of which Messrs. Beavers, Bickner, Birdsall and Toll and
Mrs. Wier (Chairperson) are members, is responsible for recommending to the
Board of Directors the appointment of independent auditors; reviewing the scope,
fees and findings of audits and other services as performed by the independent
auditors; reviewing the activities and findings of the internal audit staff; and
reviewing the company's system of internal controls.
 
Members of the Compensation Committee are Messrs. Clark, Jones, Keller, Locke
(Chairman) and Petersen. The Committee is responsible for reviewing and
approving or, where appropriate, making recommendations to the Board of
Directors relating to executive changes, salaries and benefits.
 
Members of the Committee on Directors are Messrs. Clark, Jones, Locke and Toll
(Chairman). The Committee is responsible for recommending Director nominees,
Board committee members and nonmanagement Directors' compensation to the Board
of Directors. Stockholders may recommend Director nominees for consideration by
the Committee at any time in writing, giving pertinent background information.
 
DIRECTORS' COMPENSATION
 
Directors who are not company or subsidiary officers receive an annual retainer
of $25,000, plus a $1,000 fee for each Board, Committee and stockholders meeting
attended. Committee Chairpersons are paid an additional retainer of $5,000 per
year. Directors may elect to defer the payment of retainers and fees using an
interest equivalent option or a share unit option. The interest equivalent
option accrues interest quarterly at a prime interest rate. Under the share unit
option, deferred amounts are converted into share units based on the market
price of NICOR Common Stock at the deferral date, with amounts equal to
dividends and distributions paid on NICOR Common Stock during the interim
converted into additional share units based on then current market prices for
the company's Common Stock. At retirement, the Director will be entitled to a
cash payment based on the number of share units then held and the then current
market price of NICOR Common Stock. Once each year a Director may switch all or
part of the balance between the interest equivalent option and the share unit
option. Nonofficer Directors as a group received 5,683 share units for
compensation deferred and dividends paid during 1996, with an average per share
base price of $28.95. Under a program effective with the 1995-1996 term for
Directors, nonofficer Directors will receive a grant of 300 shares of NICOR
Common Stock, together with a cash award equivalent to the then market value of
the shares, five months following commencement of each term that they serve.
 
                                        6
<PAGE>   10
 
SECURITY OWNERSHIP OF MANAGEMENT
 
Set forth below is the number of shares of the company's Common Stock
beneficially owned by each of the Directors and the executive officers of the
company named in the Summary Compensation Table and by all Directors and
executive officers as a group as of February 17, 1997, with sole voting and
investment power except as otherwise noted. No Director or executive officer
beneficially owns more than 1% of the outstanding shares of Common Stock except
Mr. Birdsall, who beneficially owns 2.2% of the outstanding shares, and no
Director or executive officer owns any shares of Preferred Stock.
 
<TABLE>
<CAPTION>
                                                                            AMOUNT AND NATURE OF
       NAME OF BENEFICIAL OWNER                      POSITION               BENEFICIAL OWNERSHIP
       ------------------------                      --------               --------------------
<S>                                       <C>                               <C>
Robert M. Beavers, Jr.................    Director                                      4,518
Bruce P. Bickner......................    Director                                      1,300
John H. Birdsall, III.................    Director                                  1,070,903(1)
Philip S. Cali........................    Executive Officer                             8,434(2)(3)(4)
W. H. Clark...........................    Director                                      1,600
David L. Cyranoski....................    Executive Officer                            16,032(3)(4)
Thomas L. Fisher......................    Director and Executive Officer               72,154(3)
Kathleen L. Halloran..................    Executive Officer                             9,752(3)
John E. Jones.........................    Director                                      1,600
Dennis J. Keller......................    Director                                      7,472(5)
Charles S. Locke......................    Director                                     30,889(5)
Thomas A. Nardi.......................    Executive Officer                             7,698(3)(4)
Sidney R. Petersen....................    Director                                      4,261(4)
Daniel R. Toll........................    Director                                      2,600
Patricia A. Wier......................    Director                                      8,220(5)
Directors and Executive Officers as a
  Group...............................                                              1,256,280(1)(2)(3)(4)(5)
  Percentage of class.................                                                   2.54
</TABLE>
 
- ---------------
(1) Includes 25,200 shares of Common Stock owned through a trust in which Mr.
    Birdsall is cotrustee with shared voting and investment power and for which
    he disclaims any beneficial interest, 625,200 shares of Common Stock owned
    through a trust for the benefit of Mr. Birdsall and his family in which he
    is cotrustee with shared voting and investment power and 173,723 shares
    owned by a family member's estate of which Mr. Birdsall is coexecutor and a
    beneficiary with shared voting and investment power.
 
(2) Includes 220 shares of Common Stock owned by Mr. Cali's wife in which Mr.
    Cali disclaims any beneficial interest.
 
                                        7
<PAGE>   11
 
(3) Includes shares or share equivalents held pursuant to company benefit plans
    as follows: (a) shares individuals have a right to acquire or will have the
    right to acquire within 60 days through the exercise of stock options: Mr.
    Cali, 5,000; Mr. Cyranoski, 12,500; Mr. Fisher, 40,000; Ms. Halloran, 4,000;
    Mr. Nardi, 4,000; and all Directors and executive officers as a group,
    72,500; (b) shares held by the NI-Gas Savings Investment and Thrift Trust
    for: Mr. Fisher, 16,541; Mr. Nardi, 1,391; and all Directors and executive
    officers as a group, 17,932; and (c) share unit equivalents credited to
    their accounts under the Stock Deferral Plan, which enables officers to
    defer, and convert, up to 50% of their cash awards from the Annual Incentive
    Compensation Plan and/or Long-Term Incentive Plan into NICOR Common Stock,
    the receipt of which is deferred: Mr. Cali, 502; Mr. Cyranoski, 1,447; Mr.
    Fisher, 5,796; Mr. Nardi, 1,225; and all Directors and executive officers as
    a group, 9,687.
 
(4) Includes shares held jointly with a spouse or in trust as follows: Mr. Cali,
    90; Mr. Cyranoski, 2,085; Mr. Nardi, 1,082; Mr. Peterson, 4,261; and all
    Directors and executive officers as a group, 8,648.
 
(5) The total shares owned by Messrs. Keller and Locke and Mrs. Wier and all
    Directors as a group include, respectively, 3,772, 29,289, 4,462 and 37,523
    share unit equivalents credited to their accounts under the Directors
    Deferred Compensation Plan described on page 6.
 
In 1996, stock ownership guidelines were established for Directors and officers
of the company and subsidiaries. These guidelines were established to align
their interests with those of the stockholders and to strengthen the focus on
activities that create shareholder value. The guidelines, stated as a multiple
of the Director's annual retainer plus fees or the officer's base salary, are as
follows: Nonofficer Director, three times; Chief Executive Officer, three times;
Senior Vice President or President of a subsidiary, one and a half times; Vice
President, one times; and Assistant Vice President, one-half times. Directors
and officers are asked to comply with these guidelines through ownership of
stock or stock equivalents within five years after inception of the guidelines
or within five years of becoming a new Director or officer.
 
In 1997, through February 17, pursuant to its previously announced $50 million
stock purchase program, the company purchased an aggregate of 203,000 shares of
Common Stock from a Birdsall family trust of which Mr. Birdsall is cotrustee in
a series of transactions for an aggregate purchase price of approximately $7.3
million. The purchase price in each transaction was determined by the closing
price of the Common Stock on the New York Stock Exchange as of the date of each
purchase. Additional purchases from this trust are expected to be made by the
company during 1997.
 
                                        8
<PAGE>   12
 
REPORT OF THE COMPENSATION COMMITTEE OF THE BOARD OF DIRECTORS ON EXECUTIVE
COMPENSATION
 
The following information regarding compensation is given with respect to the
Chief Executive Officer and other executive officers.
 
  Executive Compensation Philosophy
 
Executive compensation at NICOR is intended to assure that the company has
management capable and motivated to serve customer, employee and stockholder
interests. NICOR's executive compensation program is based upon two objectives:
 
        1) Provide market-competitive compensation opportunities; and
 
        2) Create strong links between shareholder value, financial performance
           and the pay of the company's top officers.
 
To achieve these objectives, the Compensation Committee reviews executive
assignments, responsibilities and performance. The Committee establishes or,
where appropriate, makes recommendations to the Board of Directors for executive
compensation program design and participation; salaries; and incentive
compensation opportunities, performance objectives and awards. The Committee is
composed of outside directors, none of whom has interlocking relationships with
company executives. The Committee has access to compensation consultants and to
competitive pay and industry compensation practices.
 
NICOR's executive compensation program has two components -- annual compensation
and long-term incentive compensation.
 
The annual compensation program is composed of base salary and annual incentive
compensation.
 
     Individual salaries are set within salary ranges based on periodic
     comparison to actual pay for comparable positions in the gas utility,
     diversified utility and general industries which are blended together for
     comparison purposes. This blended group is different than the Standard &
     Poor's (S&P) Utilities Index shown in the Performance Graph following this
     report. The S&P Utilities Index currently includes gas distribution,
     pipeline and electric companies. The compensation surveys used in NICOR's
     comparison are weighted to the gas distribution industry and include
     proprietary surveys prepared by the American Gas Association and Peoples
     Energy Corporation, as well as gas utility and general industry surveys
     from the Towers Perrin and the Hewitt Associates compensation data banks.
     The midpoints of the base salary ranges are targeted at the 50th percentile
     of the competitive data for each position with minimums and maximums from
     25% below to 25% above targeted levels. The executive officers' 1996
     salaries averaged 13.2% below those midpoints. In establishing actual
     salaries and merit adjustments related to these ranges, the Committee
     considers individual performance, potential, experience and changes in
     duties and responsibilities since the previous salary review.
 
                                        9
<PAGE>   13
 
     Participation in the annual incentive compensation plan, which in 1996
     included the Chief Executive Officer and the other executive officers, is
     extended to those positions that play the most important roles in carrying
     out the company's annual operating plans, and also reflects competitive
     practice. Annual incentive compensation opportunities are based on periodic
     reviews of comparable positions in the same manner as described previously
     for salaries. Annual incentive awards are targeted at about the 60th
     percentile of the competitive data. In establishing the actual bonus awards
     to be made, the Compensation Committee may take into account facts and
     circumstances which exist during the year.
 
     The Chief Executive Officer's annual incentive award is based primarily on
     a financial target which compares actual performance with predetermined
     performance objectives. Seventy percent of the target is based on the net
     income results of the company's utility operations and 30% based on the net
     income results of the nonutility and corporate operations. Mr. Fisher's
     annual incentive compensation for 1996 is discussed in greater detail in
     the section entitled CEO Compensation on page 11.
 
     The other NICOR officers have up to 85% of their annual incentive target
     based on goals related to the performance of Northern Illinois Gas, the
     company's primary subsidiary, and up to 50% related to the performance of
     the nonutility operations. Northern Illinois Gas officers have 100% of
     their annual incentive targets based on goals related to the performance of
     Northern Illinois Gas. The annual incentive target for Northern Illinois
     Gas officers is based equally upon achievement of financial and
     nonfinancial utility company goals. Nonfinancial goals relate to growth,
     cost management, customer satisfaction and safety. Annual incentive
     compensation for the executive officers for 1996 ranged from 91% to 126% of
     target, a result of achieving 125% of the utility net income goal, 0% of
     the nonutility net income goal and an average of 90% of the nonfinancial
     goals and personal objectives.
 
The long-term incentive compensation program is primarily comprised of stock
options and dividend performance units and is intended to focus senior
management clearly on the company's long-term objective of creating value for
shareholders. Under this program, participants generally receive periodic grants
of stock options and an equal amount of dividend performance units with a
combined target award value based on periodic comparison to awards for
comparable positions as described in the salary section above. The target awards
are set at about the 60th percentile of competitive data for each position.
Participants in these plans are selected by the Compensation Committee and
include the Chief Executive Officer and other executive officers who are
responsible for setting and carrying out the company's longer-range strategic
plans.
 
     - Stock options carry a maximum 10-year term and are issued at market
       value.
 
     - Both stock options and dividend performance units vest after one year,
       but the exercise of stock options is generally restricted for a
       three-year period.
 
     - Each dividend performance unit accrues dividend equivalents at the rate
       dividends are paid on a share of NICOR stock over a specified performance
       period (three years for 1996 awards).
 
                                       10
<PAGE>   14
 
     - At the end of the restricted period, the stock options automatically
       become exercisable. Dividend performance units can be earned based upon
       objectives established by the Compensation Committee for NICOR's
       three-year total shareholder return relative to the S&P Utilities Index
       (the same peer group used in the Performance Graph shown following this
       report). The potential number of dividend equivalents earned can range
       from 0% to 150% of the number granted. A 100% payout is achieved when
       NICOR's performance is in the 60th percentile of the peer group
       comparison.
 
     - If NICOR's total shareholder return for the performance period is not
       positive, dividend performance units will not be earned, regardless of
       performance relative to the S&P Utilities Index.
 
Through this combination of stock options and dividend performance units, the
long-term incentive compensation program is designed to motivate participants to
manage the company so as to achieve increases in total shareholder return,
rewarding them on the same basis that shareholders are rewarded -- through
increases in stock price and dividends. From time to time, the company may also
make restricted stock grants to selected key individuals.
 
Mr. Fisher's long-term incentive compensation for 1996 is described below.
Long-term incentive compensation for the other executive officers for 1996 was
100% of target and was based on performance relative to the S&P Utility Group
for the performance period 1994 through 1996.
 
  CEO Compensation
 
On April 22, 1996, Mr. Fisher's base salary was increased by $25,000, a 5.4%
increase. The Committee considered the following factors when reviewing Mr.
Fisher's salary: his job responsibility and scope; industry competitive data in
utility and diversified utility companies, as well as general industry; his past
salary adjustments; and individual performance, including leadership,
organization development, shareholder/investor relations and
civic/community/industry activities. The Committee did not attach any specific
weighting to any one factor, and noted that some factors were more subjective
than others.
 
The Committee awarded Mr. Fisher a grant of 34,000 stock options and dividend
performance units on May 1, 1996. The annual target is set at about the 60th
percentile of competitive data for his position as described in this report.
Stock option awards vest after one year, are generally exercisable after three
years and have a maximum 10-year term. The dividend performance units awarded to
Mr. Fisher in 1996 for his annual award have a performance period of 1996
through 1998. Dividend performance units may be earned subject to the
performance criteria described in this report. A 100% payout of each performance
unit award is achieved if NICOR's total shareholder return is in the 60th
percentile of the S&P Utilities Index for the performance period. If NICOR's
total shareholder return for the performance period is not positive, dividend
performance units will not be earned, regardless of performance relative to the
S&P Utilities Index.
 
Mr. Fisher earned $266,750 in annual incentive compensation for performance in
the calendar year 1996. This amounted to 100% of Mr. Fisher's target annual
incentive compensation award. His target award was based
 
                                       11
<PAGE>   15
 
on the achievement of predefined net income objectives, 70% on a utility
performance target and the remainder on nonutility and corporate performance
targets. Actual net income performance exceeded the utility target and was below
the nonutility target. Based upon actual performance and individual
contribution, the Board awarded Mr. Fisher 100% of the target award.
 
  1993 Tax Act
 
The Omnibus Budget Reconciliation Act of 1993 added Section 162(m) to the
Internal Revenue Code. This section provides that compensation in excess of $1
million paid or accrued by the company to any of the five most highly
compensated employees is not deductible by the company unless it meets
procedural criteria mandated by law. The Internal Revenue Service (IRS) has
interpreted this section of the Act and issued regulations. The criteria for
preserving compensation deductibility are complex and could be subject to
further modification.
 
The Compensation Committee has carefully reviewed the impact of Section 162(m)
as it applies to the company's compensation programs. It is the Committee's
policy to maximize the effectiveness, as well as the tax deductibility, of the
company's executive compensation programs. Therefore, the Committee considers it
to be in the best interests of the company's stockholders to retain somewhat
broader discretion in determination of performance criteria and administration
of the company's Annual Incentive Programs than that contemplated by the IRS
regulations. In view of anticipated compensation levels of the covered employees
in fiscal year 1997, the Committee expects that all compensation paid or accrued
will qualify as a tax deductible amount.
 
         Compensation Committee of the Board of Directors of NICOR Inc.
 
        Charles S. Locke, Chairman  W. H. Clark  John E. Jones  Dennis J.
                           Keller  Sidney R. Petersen
 
                                       12
<PAGE>   16
 
STOCK PERFORMANCE GRAPH
 
The following graph shows a five-year comparison of cumulative total returns for
NICOR Common Stock, the S&P Utilities Index and the S&P 500 Index as of December
31 of each of the years indicated, assuming $100 was invested on January 1,
1992, and all dividends were reinvested.
 
                COMPARISON OF FIVE-YEAR CUMULATIVE TOTAL RETURN
                                    [GRAPH]
 



                                1992    1993    1994    1995    1996

NICOR ........................  $115    $135    $116    $147    $199
S&P Utilities ................   108     124     114     161     167
S&P 500 ......................   108     118     120     165     203
<PAGE>   17
 
SUMMARY COMPENSATION TABLE
 
The following table shows executive compensation for the years indicated for the
Chief Executive Officer and the four other highest-compensated executive
officers:
 
<TABLE>
<CAPTION>
                                                                                     LONG-TERM COMPENSATION
                                                                                 ------------------------------
                                                    ANNUAL COMPENSATION            AWARDS          PAYOUTS
                                              --------------------------------   ----------   -----------------
                                                                  OTHER ANNUAL     SHARES         LONG-TERM          ALL OTHER
              NAME AND                        SALARY     BONUS    COMPENSATION   UNDERLYING   INCENTIVE PLAN(1)   COMPENSATION(2)
         PRINCIPAL POSITION            YEAR     ($)       ($)         ($)         OPTIONS            ($)                ($)
- ---------------------------------------------------------------------------------------------------------------------------------
<S>                                    <C>    <C>       <C>       <C>            <C>          <C>                 <C>
T. L. Fisher                           1996   476,346   266,750      2,620         34,000          141,895            35,917
Chairman, President and                1995   439,481   271,975      2,550         80,000           37,350            31,247
  Chief Executive Officer              1994   394,039   197,439      2,500         37,000               --            26,201
  of the Company and Northern
  Illinois Gas Company
D. L. Cyranoski                        1996   199,539    87,763          0          9,500           34,515            13,332
Senior Vice President, Secretary       1995   188,846    56,067          0         23,000            8,404            11,441
  and Controller of the Company and    1994   171,923    59,720          0          9,000               --             9,332
  Northern Illinois Gas Company
T. A. Nardi                            1996   185,231    63,329          0          9,000           26,845             9,159
Senior Vice President Nonutility       1995   170,769    64,449          0         23,000            3,735             8,142
  Operations
  and Business Development of the      1994   137,200    43,418          0          7,000               --             6,097
  Company and Senior Vice President
  Business Development of Northern
  Illinois Gas Company
P. S. Cali                             1996   177,885    78,018          0          8,500                0             7,223
Senior Vice President Operations
  of Northern Illinois Gas Company(3)
K. L. Halloran                         1996   161,539    62,499          0          5,500           19,175             9,815
Senior Vice President Information
  Services, Rates and Human Resources
  of Northern Illinois Gas Company(3)
</TABLE>
 
- ---------------
(1) Payouts under the Dividend Performance Unit program of the Long-Term
    Incentive Plan are made in cash or up to 50% can be deferred and converted
    into share unit equivalents in the Stock Deferral Plan. Each dividend
    performance unit accumulates dividends equivalent to dividends paid on one
    share of NICOR Common Stock during a three-year performance period. The
    payout is determined by a performance multiplier which ranges from 0 to 1.5
    based on NICOR total shareholder return over the performance period as
    compared to the performance of the S&P Utilities Index. Payouts in 1996
    relate to the Dividend Performance Units awarded in 1994 having a 1994-1996
    performance period.
 
                                       14
<PAGE>   18
 
(2) Includes company contributions to the NI-Gas Savings Investment Plan and
    credits to the Supplemental Savings Investment Plan for Messrs. Fisher,
    Cyranoski, Nardi and Cali and Ms. Halloran of $17,937, $8,171, $7,002,
    $6,667 and $6,106, respectively; interest earned in excess of market on
    deferred salary for Messrs. Fisher, Cyranoski, Nardi, and Cali and Ms.
    Halloran of $10,988, $5,161, $2,157, $556, and $3,709, respectively; and
    amounts credited under the 1968 NI-Gas Incentive Compensation Plan for Mr.
    Fisher of $6,992.
 
(3) Not an executive officer during 1995 or 1994.
 
OPTION GRANTS TABLE
 
The following table shows stock options granted in 1996 to the Chief Executive
Officer and the four other highest-compensated executive officers:
 
<TABLE>
<CAPTION>
                                                      INDIVIDUAL GRANTS
                                      --------------------------------------------------
                                      NUMBER OF     % OF TOTAL
                                        SHARES       OPTIONS      EXERCISE
                                      UNDERLYING    GRANTED TO     OR BASE                    GRANT DATE
                                       OPTIONS     EMPLOYEES IN     PRICE     EXPIRATION   PRESENT VALUE(2)
                NAME                  GRANTED(1)   FISCAL YEAR    ($/SHARE)      DATE            ($)
                ----                  ----------   ------------   ---------   ----------   ----------------
<S>                                   <C>          <C>            <C>         <C>          <C>
T. L. Fisher........................    34,000          24         28.250     05/01/2006         109,480
D. L. Cyranoski.....................     9,500           7         28.250     05/01/2006          30,590
T. A. Nardi.........................     9,000           6         28.250     05/01/2006          28,980
P. S. Cali..........................     8,500           6         28.250     05/01/2006          27,370
K. L. Halloran......................     5,500           4         28.250     05/01/2006          17,710
All Stockholders(3).................       N/A         N/A            N/A            N/A     161,586,198
</TABLE>
 
- ---------------
(1) Options become exercisable on May 2, 1999.
 
(2) Present value of grants on May 1, 1996, the date of grant, using the
    Black-Scholes option-pricing model with the following assumptions: dividend
    yield of 4.7%, volatility of 15.8%, risk-free interest rate of 6.2%, and
    expected period outstanding of three years. The weighted-average present
    value of an option granted in 1996 was $3.22.
 
(3) For "All Stockholders" the present value is calculated based on the
    Black-Scholes value of $3.22 per option at May 1, 1996 and the outstanding
    shares of Common Stock on March 4, 1996, the record date of the 1996 Annual
    Meeting.
 
                                       15
<PAGE>   19
 
AGGREGATED OPTION EXERCISES IN 1996 AND YEAR-END OPTION VALUE TABLE
 
The following table shows the aggregated stock option exercises in 1996 and the
December 31, 1996 stock option values for the Chief Executive Officer and the
four other highest-compensated executive officers:
 
<TABLE>
<CAPTION>
                                                                                           VALUE OF
                                                                       NUMBER OF          UNEXERCISED
                                                                   SHARES UNDERLYING     IN-THE-MONEY
                                                                      UNEXERCISED       OPTIONS AT YEAR
                                                                    OPTIONS AT YEAR         END (2)
                                                                          END          -----------------
                                         SHARES         VALUE      -----------------     EXERCISABLE/
                                        ACQUIRED     REALIZED(1)     EXERCISABLE/        UNEXERCISABLE
                NAME                   ON EXERCISE       ($)         UNEXERCISABLE            ($)
                ----                   -----------   -----------   -----------------   -----------------
<S>                                    <C>           <C>           <C>                 <C>
T. L. Fisher.........................         0           N/A        40,000/151,000    272,500/1,450,250
D. L. Cyranoski......................     3,500        29,313         12,500/41,500      117,750/401,375
T. A. Nardi..........................     4,000        49,875          4,000/39,000       27,250/381,125
P. S. Cali...........................         0           N/A          5,000/31,500       54,375/319,625
K. L. Halloran.......................         0           N/A          4,000/16,500       27,250/149,250
</TABLE>
 
- ---------------
(1) Value based on market value of the company's Common Stock at date of
    exercise minus the exercise price.
 
(2) Value based on market value of the company's Common Stock at December 31,
    1996, minus the exercise price.
 
LONG-TERM INCENTIVE PLAN--AWARDS IN 1996
 
The following table shows dividend units granted in 1996 to the Chief Executive
Officer and the four other highest-compensated executive officers:
 
<TABLE>
<CAPTION>
                                                                           ESTIMATED FUTURE PAYOUTS UNDER
                                                  PERFORMANCE                NON-STOCK PRICE-BASED PLAN
                                    NUMBER           PERIOD          -------------------------------------------
             NAME                  OF UNITS      UNTIL PAYMENT       THRESHOLD($)      TARGET($)      MAXIMUM($)
             ----                  --------      --------------      ------------      ---------      ----------
<S>                                <C>           <C>                 <C>               <C>            <C>
T. L. Fisher...................     34,000       1996 thru 1998         33,575          134,300        201,450
D. L. Cyranoski................      9,500       1996 thru 1998          9,381           37,525         56,288
T. A. Nardi....................      9,000       1996 thru 1998          8,888           35,550         53,325
P. S. Cali.....................      8,500       1996 thru 1998          8,394           33,575         50,363
K. L. Halloran.................      5,500       1996 thru 1998          5,431           21,725         32,588
</TABLE>
 
Each dividend unit accumulates dividends equivalent to the dividends paid on one
share of NICOR Common Stock during the three-year period. Estimated future
payouts are based on the present NICOR Common Stock dividend rate. If dividends
increase during this period, the dividend equivalents would increase
 
                                       16
<PAGE>   20
 
proportionately. The payout is determined by a performance multiplier which
ranges from 0 to 1.5 based on NICOR total shareholder return over the three-year
performance period as compared to the performance of the S&P Utilities Index,
except that no awards will be earned if shareholder return for the period is not
positive, regardless of the performance relative to the S&P Utilities Index. All
dividend units earned become payable three years after the date of grant.
 
RETIREMENT BENEFITS UNDER RETIREMENT PLANS
 
The following table shows the estimated annual benefits under the company's
retirement plans on a straight life annuity basis at age 65 for various
compensation bases and years of service classifications.
 
<TABLE>
<CAPTION>
                                                                        YEARS OF SERVICE
    BASE                                        ----------------------------------------------------------------
COMPENSATION                                       15            20            25            30            35
- ------------                                    --------      --------      --------      --------      --------
<C>            <S>                              <C>           <C>           <C>           <C>           <C>
  $150,000     .............................    $ 38,355      $ 51,140      $ 63,925      $ 76,710      $ 86,085
   250,000     .............................      65,355        87,140       108,925       130,710       146,335
   350,000     .............................      92,355       123,140       153,925       184,710       206,585
   450,000     .............................     119,355       159,140       198,925       238,710       266,835
   550,000     .............................     146,355       195,140       243,925       292,710       327,085
   650,000     .............................     173,355       231,140       288,925       346,710       387,335
</TABLE>
 
The Retirement Plan, which covers all company and Northern Illinois Gas Company
employees not covered by a bargaining agreement, including executive officers of
the company, is an actuarially-based, defined benefit plan with benefits
determined by "Base Compensation" (highest annual average of base salary for any
consecutive 60-month period) and years of service. The base salary for this
purpose is the amount shown under "Salary" in the Summary Compensation Table.
Benefits payable under the Retirement Plan in excess of the limitations under
the Internal Revenue Code will be paid under the terms of the Supplemental
Retirement Plan. Under the Retirement Plan, an employee may elect to receive a
lump sum benefit at retirement in lieu of semi-monthly payments. The lump sum
payment is based on the actuarial present value of the future retirement
payments utilizing the yield on 30-year Treasury Constant Maturities in effect
at the beginning of the quarter during which retirement occurs. The benefits are
not subject to any deduction for social security payments or any other offset
amounts. Credited years of service under these arrangements are as follows: Mr.
Fisher, 29; Mr. Cyranoski, 30; Mr. Nardi, 15; Mr. Cali, 19; and Ms. Halloran,
22.
 
CHANGE IN CONTROL ARRANGEMENTS
 
In the event of a "change in control" of the company, then the following would
apply:
 
     Under the provisions of the 1989 Long-Term Incentive Plan, all outstanding
     stock options and restricted stock will automatically become fully
     exercisable and/or vested;
 
                                       17
<PAGE>   21
 
     Under the terms of the Salary Deferral Plan, any deferred balance account
     shall be determined as though the participant retired and distributed as
     soon as practical; and,
 
     Under the terms of the Capital Accumulation Plan, under which certain
     executive officers deferred a portion of their salary in 1984 and 1985, the
     amount deferred shall be credited at an interest rate of 20 percent per
     annum from the date of deferral, less amounts already received, and
     distributed as soon as practical following termination within two years for
     any reason other than death or total and permanent disability.
 
A change in control occurs if any person or group is or becomes a beneficial
owner of 30% or more of the voting power of NICOR; if a tender offer not
approved by the Board is made during which the offeror is or becomes the owner
of 25% or more of the company's voting stock, or as a result of which the
offeror could become the owner of 50% or more of the company's voting stock
unless the offer is withdrawn by three business days prior to its scheduled
termination; or if individuals who were the Board's nominees for election shall
not constitute a majority of the Board.
 
ITEM 2. APPROVAL OF THE NICOR INC. 1997 LONG-TERM INCENTIVE PLAN
 
            (YOUR BOARD OF DIRECTORS RECOMMENDS A VOTE FOR APPROVAL)
 
BACKGROUND
 
In 1989, stockholders approved the NICOR Inc. 1989 Long-Term Incentive Plan (the
"1989 Plan") for key executives of NICOR. However, changes in IRS regulations
require stockholder approval of a similar successor plan to retain the tax
deductibility of the executive compensation program. The NICOR Inc. 1997
Long-Term Incentive Plan (the "1997 Plan") is contingent on stockholder approval
and, if adopted by stockholders, would replace the 1989 Plan and allow NICOR to
come into compliance with these regulations. Payouts and measurements from the
1997 Plan remain at the same level as the 1989 Plan. Under the 1989 Plan, Stock
Options for approximately 600,000 shares were outstanding as of February 17,
1997, and approximately 1,000,000 shares remained available for additional
awards thereunder. The Board believes the Long-Term Incentive Plan has been
successful in focusing management on stockholder interests and will continue to
be a valuable tool for attracting, retaining and motivating key executives, and
therefore recommends approval of the 1997 Plan.
 
PROPOSED PLAN
 
The 1997 Plan authorizes 2,000,000 shares of Common Stock, par value $2.50, to
be used for stock options, alternate stock rights, restricted stock and
performance unit awards. If an award made under the 1997 Plan expires,
terminates or is forfeited, canceled or settled in cash without issuance of
shares of Common Stock covered by the award, those shares will be available for
future awards under the 1997 Plan. The 1997 Plan is
 
                                       18
<PAGE>   22
 
unlimited in duration and, if terminated, will remain in effect at least as long
as any options, alternate stock rights, restricted stock awards or performance
unit awards remain outstanding. The closing price of the company's Common Stock
reported on the New York Stock Exchange Composite Transactions for February 17,
1997 was $35.375.
 
ADMINISTRATION
 
The 1997 Plan will be administered by a committee selected by the Board, and
shall consist of two or more members of the Board (the "Committee"). Initially
the Compensation Committee of the Board will serve as the Committee. Subject to
the provisions of the 1997 Plan, the Committee will have authority to select
employees to receive awards, to determine the time or times of receipt, to
determine the types of awards and the number of shares covered by the awards, to
establish the terms, conditions and provisions of such awards, to determine the
value of performance units, and to cancel or suspend awards. In making such
award determinations, the Committee may take into account the nature of services
rendered by the respective employee, his or her present and potential
contribution to the company's success and such other factors as the Committee
deems relevant. The Committee is authorized to interpret the 1997 Plan; to
establish, amend, and rescind any rules and regulations relating to the 1997
Plan; to determine the terms and provisions of any agreements made pursuant to
the 1997 Plan; and to make all other determinations that may be necessary or
advisable for the administration of the 1997 Plan.
 
Each stock option, alternate stock right, restricted stock award or performance
unit award may be evidenced by an agreement containing such provisions
consistent with the 1997 Plan that the Committee shall approve. While awards are
generally nontransferable, the Committee may permit initial transferability
without consideration to certain family members, family trusts and family
partnerships. In the event of a change in control, all outstanding stock
options, alternate stock rights and restricted stock will automatically become
fully exercisable and/or vested, and dividend equivalents and performance units
may be paid out in such manner and amounts as determined by the Committee. A
change of control is defined to include: (a) the acquisition by any person of
20% or more of the company's voting stock, excluding acquisitions made by a
benefit plan maintained by the company; or (b) a change in the majority of the
Board or the incumbent Board as a result of an election contest.
 
PARTICIPATION
 
Key executives and managerial employees of the company and its subsidiaries may
be selected by the Committee to receive awards under the 1997 Plan. The maximum
number of shares that may be subject to awards made to any one employee in any
calendar year shall be 200,000 shares. At the discretion of the Committee, an
eligible employee may be a participant in the stock option, alternate stock
right, restricted stock award or performance unit award portion of the 1997 Plan
or any combination thereof, and more than one award may be granted to an
eligible employee. Although no determination has been made as to the
 
                                       19
<PAGE>   23
 
number of employees who will be eligible for awards under the 1997 Plan, based
on the company's experience under the 1989 Plan approximately 30 employees of
the company and its subsidiaries are currently eligible to be considered for
awards under the 1997 Plan.
 
STOCK OPTIONS
 
A Stock Option is an award that entitles the employee to purchase shares of
Common Stock at a price fixed at the time the option is awarded. Stock Options
may be awarded under the 1997 Plan for a term of up to 10 years, with an
exercise price to be established by the Committee at not less than the market
value of the Common Stock on the date of the award or, if greater, the par value
of the Common Stock. The 1997 Plan authorizes the award of both nonqualified
stock options (NQOs) and incentive stock options (ISOs). The Committee may award
dividend equivalents with respect to NQOs and, subject to the limitations
provided in the Internal Revenue Code, with respect to ISOs. A dividend
equivalent award earns an amount equal to dividends payable with respect to the
number of shares that are subject to the option for the period the option is
outstanding and unexercised. Under the 1997 Plan and except as otherwise
described in this summary, an option may be exercised at any time during the
exercise period established by the Committee, except that: (i) no option may be
exercised after an employee is terminated for cause or (except in the case of
death, disability or change in control) prior to the date an employee completes
one continuous year of employment with the company and its affiliated companies
after the award is made; (ii) no option may be exercised more than 10 years
after the date of grant if employment with the company and its affiliated
companies terminates by reason of death, disability or retirement; and (iii) if
employment terminates for any other reason, no option may be exercised more than
three months after termination with the company and its affiliated companies.
The aggregate value (determined at the time of the award) of the Common Stock
with respect to which ISOs are exercisable for the first time by any employee
during any calendar year may not exceed $100,000. The exercise price of options
may be paid in cash, in shares of Common Stock or in any combination of cash and
Common Stock, as the Committee may permit. Cash proceeds received by the company
upon the exercise of any option will be added to the general funds of the
company and used for general corporate purposes. Grants of options do not award
any optionee any rights as a shareholder, and such rights will accrue only as to
shares actually purchased through the exercise of an option.
 
ALTERNATE STOCK RIGHTS
 
Alternate stock rights (ASRs) are awards that may be granted in tandem with NQOs
or ISOs and entitle the holder to receive an amount equal to the difference
between the fair market value of a share of Common Stock at the time of exercise
of the ASR and the option price, subject to the applicable terms and conditions
of the tandem options. An ASR may be exercised at any time when the option to
which it relates may be exercised and will terminate no later than the date on
which the right to exercise the tandem option terminates. The Committee has
discretion to determine whether the exercise of an ASR will be settled in cash,
in Common Stock (valued at its fair market value at the time of exercise), or in
a combination of the two. The exercise of
 
                                       20
<PAGE>   24
 
an ASR requires the surrender of the tandem option, and the exercise of a stock
option requires the surrender of any tandem ASR.
 
RESTRICTED STOCK
 
Restricted stock awards are grants of Common Stock made to employees subject to
a required period of employment following the award (the "Restricted Period")
and/or any other conditions established by the Committee. An employee will
become the holder of shares of restricted stock free of all restrictions if he
or she completes the Restricted Period and/or satisfies any other conditions as
specified by the Committee; otherwise, the shares will be forfeited. Under the
1997 Plan, the Restricted Period for service-based stock may not be less than
one year and, for those awards in lieu of service-based vesting, the award will
be subject to other vesting conditions. The employee will have the right to vote
the shares of restricted stock and, unless the Committee determines otherwise,
the right to receive dividends on the shares. The employee may not sell or
otherwise dispose of restricted stock until the conditions imposed by the
Committee have been satisfied. The Committee may, in its discretion, substitute
cash equal to the fair market value of Common Stock, determined as of the date
of distribution, for some or all Common Stock otherwise required to be
distributed to an employee.
 
PERFORMANCE UNITS
 
Performance units are awards granted to employees who may receive a value for
the units at the end of a performance period established by the Committee if
performance measures established by the Committee at the beginning of the
performance period are met. Under the 1997 Plan, a number of performance units
will initially be assigned by the Committee and the number of units actually
earned will be contingent on future performance of the company or the holder's
subsidiary, division or department over the performance period in relation to
the established performance measures. Generally, performance units are intended
to be performance-based compensation as defined in Section 162(m) of the
Internal Revenue Code. However, the Committee has the discretion to award
performance units that are not intended to satisfy the criteria of Section
162(m). For performance units representing shares of Common Stock when granted,
the maximum number of shares that can be awarded to an individual in any
calendar year is 200,000 shares. For performance units representing cash and for
units stated as dividend equivalents when granted, the combined maximum
aggregate value that can be earned by an individual for units granted in any
calendar year is $600,000. Performance measures will be objective and may be
based upon one or more of the following performance goals: total shareholder
return, return on equity, return on investment, cost management, growth
objectives and customer satisfaction. The Committee may state the value of
performance units when awarded in Common Stock, cash or dividend equivalent
rights, and in either case may pay awards when earned wholly in shares of Common
Stock, wholly in cash, or in a combination of the two.
 
                                       21
<PAGE>   25
 
If a participant terminates employment during the performance period due to
death or disability, if the performance units are not intended to meet the
requirements of performance-based compensation, or in the event of a change in
control, the Committee may accelerate the determination of the value of the
units and settlement or make other adjustments as it deems appropriate. If a
participant terminates for reasons other than death or disability and the
performance units are intended to meet the requirements of performance-based
compensation, the Committee may determine that the participant is entitled to a
settlement, provided that any settlement shall not be made until the end of the
performance period and shall not exceed the settlement that would be made if the
participant remained an employee during the performance period.
 
ADJUSTMENTS
 
In the event of any change in the outstanding shares of Common Stock by reason
of any stock dividend, split, spin-off, recapitalization, merger, consolidation,
combination, exchange of shares or other similar change, the aggregate number of
shares with respect to which awards may be made under the 1997 Plan, and the
terms and the number of shares of any outstanding option, ASR, performance unit
or restricted stock, may be equitably adjusted by the Committee in its sole
discretion.
 
AMENDMENT
 
The 1997 Plan may be suspended, terminated or amended in any way by the Board,
provided that, in the absence of shareholder approval, no amendment of the 1997
Plan or action of the Committee may increase the total number of shares of
Common Stock with respect to which awards may be made under the 1997 Plan
(except as discussed in "Adjustments" above). No amendment, suspension or
termination of the 1997 Plan may alter or impair any option, ASR, share of
restricted stock or performance unit previously awarded under the 1997 Plan
without the consent of the holder thereof.
 
FEDERAL INCOME TAX CONSEQUENCES
 
Under present federal income tax laws, the grant of an NQO, ISO, ASR, restricted
stock or performance unit award under the 1997 Plan will generally not result in
taxable income to the employee at the time of the grant, and the company will
not be entitled to a deduction at that time.
 
An employee generally will realize taxable ordinary income at the time of
exercise of an NQO in an amount equal to the excess of the fair market value of
the shares acquired over the exercise price for those shares, and the company
will be entitled to a corresponding deduction. The exercise of an ISO generally
will not result in taxable income to the employee, nor will the company be
entitled to a deduction at that time. Generally, if the employee does not
dispose of the stock during the applicable holding period, any amount realized
in excess of the exercise price will be taxed to the employee as capital gain
upon disposition of such shares, and the company will not be entitled to any
deduction for federal income tax purposes. If the holding period requirements
are not met, the employee will generally realize taxable ordinary income, and a
corresponding
 
                                       22
<PAGE>   26
 
deduction will be allowed to the company at the time of the disposition of the
shares in an amount equal to the lesser of (i) the excess of the fair market
value of the shares on the date of exercise over the exercise price, or (ii) the
excess, if any, of the amount realized upon disposition of the shares over the
exercise price. Dividends received by an employee on dividends awarded with
respect to ISOs and NQOs will be taxable to the employee as ordinary income and
will be deductible by the company.
 
Upon exercise of an ASR, the amount of cash or the fair market value of shares
received will be taxable to the employee as ordinary income, and the company
will be entitled to a corresponding deduction. The fair market value of
restricted stock generally will be taxable to the employee as ordinary income at
the time the restrictions lapse and/or performance measures are achieved, and
the company will be entitled to a corresponding deduction. Dividends received by
an employee during the restricted period will be taxable to the employee as
ordinary income and will be deductible by the company. The amount of cash or the
fair market value of shares received in payment of performance units will be
taxable to the employee as ordinary income at the time of payment, and the
company will be entitled to a corresponding deduction.
 
Any payment or acceleration of the payment of awards under the Plan because of a
change in control may cause part or all of the amount paid to be treated as a
"parachute payment" under the Internal Revenue Code, which may subject the
employee to a 20% excise tax and which may not be deductible by the company.
Special tax rules and elections apply under certain circumstances which may
affect the timing and the measurement of income recognized in connection with
awards under the Plan, particularly in the case of individuals subject to
Section 16(b) of the Securities Exchange Act of 1934 (generally, executive
officers and directors), and which may affect the calculation of an employee's
alternative minimum tax. All taxable income recognized by an employee under the
1997 Plan is subject to applicable tax withholding which may be satisfied, with
the consent of the Committee, through the surrender of shares of Common Stock
that the employee already owns, or to which the employee is otherwise entitled
under the 1997 Plan.
 
                              INDEPENDENT AUDITORS
 
Upon recommendation of the Audit Committee, Arthur Andersen LLP, independent
public accountants, has been reappointed by the Board to audit the accounts of
the company for 1997. Arthur Andersen LLP has audited the accounts of the
company and its predecessor since 1954. A representative of the firm will be
present at the Annual Meeting of Stockholders with the opportunity to make a
statement and respond to appropriate questions.
 
                                       23
<PAGE>   27
 
                             STOCKHOLDER PROPOSALS
 
Stockholder proposals must be received at the company's General Office, P.O. Box
3014, Naperville, Illinois 60566-7014 on or before November 6, 1997, and must
otherwise comply with Securities and Exchange Commission requirements to be
eligible for inclusion in the Proxy Statement and the Form of Proxy relating to
the 1998 Annual Meeting of Stockholders. In addition, written notice must be
received on or before February 16, 1998 and must otherwise comply with the
company's By-Laws in order for stockholder proposals to be presented at the 1998
Annual Meeting.
 
                                 OTHER MATTERS
 
As of the date of this Proxy Statement, the company knows of no other matters to
be brought before the meeting. If, however, further business is properly
presented, the proxy holders will act in accordance with their best judgment.
 
By order of the Board of Directors.
 
                                          DAVID L. CYRANOSKI
                                          Senior Vice President,
                                          Secretary and Controller
March 6, 1997
 
                                       24
<PAGE>   28


  PROXY SOLICITED BY THE BOARD OF DIRECTORS

  The undersigned appoints Thomas L. Fisher, John H. Birdsall, III, Charles S.
  Locke, or any of them, proxies to vote all shares of stock which the
  undersigned is entitled to vote at the annual meeting of stockholders of the
  company, April 17, 1997 or at any adjournment thereof, on all matters as set
  forth in the Proxy Statement and on all other matters properly presented at
  the meeting.
        
  Proxies will be voted as directed.
  In the absence of specific direction, signed proxies will be voted FOR both
  items.
        


Continued and to be dated and signed on the other side

CONTINUED FROM THE OTHER SIDE
THE BOARD OF DIRECTORS RECOMMENDS A VOTE FOR BOTH PROPOSALS.  INDICATE YOUR
VOTE BY AN X IN THE APPROPRIATE BOXES.

- -----------------------------------------------------------------------    
1. Election of Directors  Nominees:                                  
                          ---------------------------------------------    
   [ ] FOR                1.  R. M. Beavers, Jr.    7.  D. J. Keller      
       ALL Nominees       2.  B. P. Bickner         8.  C. S. Locke       
                          3.  J. H. Birdsall, III   9.  S. R. Petersen    
   [ ] WITHHOLD:          4.  W. H. Clark          10.  D. R. Toll        
       ALL Nominees       5.  T. L. Fisher         11.  P. A. Wier        
                          6.  J. E. Jones                                 
   [ ] FOR                                                           
       ALL Nominees EXCEPT (1)    
 (1) To Withhold authority to vote for any nominee, write that       
     nominee's name below and mark an X in the "For ALL EXCEPT"      
     box above.                                                      
- -----------------------------------------------------------------------    
- -----------------------------------------------------------------------
2.  Approval of the NICOR Inc.       For    Against   Abstain  
    1997 Long-Term Incentive Plan    [ ]      [ ]      [ ]     
- -----------------------------------------------------------------------
                                                               
                                     P.O. Box 3014             
                                     Naperville, IL 60566-7014 
                                     630 305-9500              
[NICOR LOGO]                                                   
- -----------------------------------------------------------------------
        NICOR


<TABLE>
<S>                                                        <C>                                     <C> 
P
R
O
X
Y                                                                                                    Date
                                                                                                         ---------------------------

Please vote, date and sign your name(s) exactly as         --------------------------------        ---------------------------------
shown and mail promptly in the enclosed envelope.          Stockholder Signature                   If Joint Account, ALL Should sign


[NICOR LOGO]                                                                                              P.O. Box 3014            
- ---------------------------------------------------------------------------                               Naperville, IL 60566-7014
  NICOR

</TABLE>
<PAGE>   29
                                                                       APPENDIX












                                NICOR INC. 1997
                            LONG-TERM INCENTIVE PLAN





















<PAGE>   30
 

                               TABLE OF CONTENTS



          SECTION 1..............................................   1
                GENERAL..........................................   1
                  1.1.  Purpose..................................   1
                  1.2.  Participation............................   1
                  1.3.  Operation and Administration.............   1

          SECTION 2..............................................   2
                OPTIONS..........................................   2
                  2.1.  Definitions..............................   2
                  2.2.  Eligibility..............................   2
                  2.3.  Price....................................   2
                  2.4.  Exercise.................................   3
                  2.5.  Expiration Date..........................   3
                  2.6.  Dividend Equivalents.....................   4

          SECTION 3..............................................   4
                ALTERNATE STOCK RIGHTS...........................   4
                  3.1.  Definition...............................   4
                  3.2.  Eligibility..............................   4
                  3.3.  Exercise.................................   4
                  3.4.  Settlement of Award......................   4
                  3.5.  Expiration Date..........................   4

          SECTION 4..............................................   4
                RESTRICTED STOCK.................................   4
                  4.1.  Definition...............................   4
                  4.2.  Eligibility..............................   5
                  4.3.  Terms and Conditions of Awards...........   5
                  4.4.  Substitution of Cash.....................   6
                  4.5.  Deferred Delivery........................   6

          SECTION 5..............................................   6
                PERFORMANCE UNITS................................   6
                  5.1.  Definition...............................   6
                  5.2.  Eligibility..............................   6
                  5.3.  Terms and Conditions of Awards...........   6
                  5.4.  Settlement...............................   7
                  5.5.  Performance-Based Compensation...........   8

          SECTION 6..............................................  10
                OPERATION AND ADMINISTRATION.....................  10
                  6.1.  Effective Date...........................  10
                  6.2.  Shares Subject to Plan...................  10
                  6.3.  Individual Limits on Awards..............  10
                  6.4.  Adjustments to Shares....................  11
                  6.5.  Limit on Distribution....................  13
                  6.6.  Liability for Cash Payments..............  14
                  6.7.  Withholding..............................  14
                  6.8.  Transferability..........................  14




                                      i


<PAGE>   31

                  6.9.   Notices.................................   14
                  6.10.  Form and Time of Elections..............   15
                  6.11.  Agreement With Company..................   15
                  6.12.  Limitation of Implied Rights............   15
                  6.13.  Evidence................................   15
                  6.14.  Action by Company or Related Company....   16
                  6.15.  Gender and Number.......................   16

          SECTION 7..............................................   16
                CHANGE IN CONTROL................................   16

          SECTION 8..............................................   16
                COMMITTEE........................................   16
                  8.1.   Administration..........................   16
                  8.2.   Selection of Committee..................   16
                  8.3.   Powers of Committee.....................   16
                  8.4.   Delegation by Committee.................   17
                  8.5.   Information to be Furnished to Committee   18

          SECTION 9..............................................   18
                AMENDMENT AND TERMINATION........................   18

          SECTION 10.............................................   18
                DEFINED TERMS....................................   18

                                      ii

<PAGE>   32
                                NICOR INC. 1997
                            LONG-TERM INCENTIVE PLAN


                                  SECTION 1
                                      
                                   GENERAL

     1.1. Purpose.  The NICOR Inc. 1997 Long-Term Incentive Plan (the "Plan")
has been established by NICOR Inc. (the "Company") to:

(a)  attract and retain key executive and managerial employees;

(b)  motivate participating employees, by means of appropriate incentives, to
     achieve long-range goals;

(c)  provide incentive compensation opportunities that are competitive with
     those of other major corporations; and

(d)  further identify Participants' interests with those of the Company's
     other shareholders through compensation that is based on the Company's
     common stock;

and thereby promote the long-term financial interest of the Company and the
Related Companies, including the growth in value of the Company's equity and
enhancement of long-term shareholder return.

     1.2. Participation.  Subject to the terms and conditions of the Plan, the
Committee shall determine and designate, from time to time, from among the
employees of the Company and/or the Related Companies who are key executives or
managerial employees, those persons who will be granted one or more Awards
under the Plan, and thereby become "Participants" in the Plan.  In the
discretion of the Committee, and subject to the terms of the Plan, a
Participant may be granted any Award permitted under the provisions of the
Plan, and more than one Award may be granted to a Participant.  Except as
otherwise agreed by the Company and the Participant, or except as otherwise
provided in the Plan, an Award under the Plan shall not affect any previous
Award under the Plan or an award under any other plan maintained by the Company
or the Related Companies.

     1.3. Operation and Administration.  The operation and administration of
the Plan, including the Awards made under the Plan, shall be subject to the
provisions of Section 6 (relating to operation and administration).
Capitalized terms in the Plan shall be defined as set forth in the Plan
(including the definition provisions of Section 10 of the Plan).

<PAGE>   33



                                  SECTION 2

                                   OPTIONS

     2.1. Definitions.  The grant of an "Option" under this Section 2 entitles
the Participant to purchase shares of Stock at a price fixed at the time the
Option is granted, or at a price determined under a method established at the
time the Option is granted, subject to the terms of this Section 2.  Options
granted under this Section 2 may be either Incentive Stock Options or
Non-Qualified Stock Options, as determined in the discretion of the Committee.
An "Incentive Stock Option" is an Option that is intended to satisfy the
requirements applicable to an "incentive stock option" described in section
422(b) of the Code.  A "Non-Qualified Option" is an Option that is not intended
to be an "incentive stock option" as that term is described in section 422(b)
of the Code.

     2.2. Eligibility.  The Committee shall designate the Participants to whom
Options are to be granted under this Section 2 and shall determine the number
of shares of Stock to be subject to each such Option.  In no event shall the
aggregate fair market value of Stock (determined at the time the Option is
granted) with respect to which Incentive Stock Options are exercisable for the
first time by an individual during any calendar year (under all plans of the
Company and all Related Companies) exceed $100,000.

     2.3. Price.  The determination and payment of the purchase price of a
share of Stock under each Option granted under this Section 2 shall be subject
to the following:

(a)  The purchase price shall be established by the Committee or shall be
     determined by a method established by the Committee at the time the Option
     is granted; provided, however, that in no event shall such price be less
     than the greater of: (i) 100% of the Fair Market Value of a share of Stock
     as of the date on which the Option is granted; or (ii) the par value of a
     share of Stock on such date.

(b)  Subject to the following provisions of this subsection 2.3, the full
     purchase price of each share of Stock purchased upon the exercise of any
     Option shall be paid at the time of such exercise (except that, in the
     case of a cashless exercise arrangement approved by the Committee, payment
     may be made as soon as practicable after the exercise) and, as soon as
     practicable thereafter, a certificate representing the shares so purchased
     shall be delivered to the person entitled thereto.

(c)  The purchase price shall be payable in cash or in shares of Stock (valued
     at Fair Market Value as of the day of



                                      2

<PAGE>   34

     exercise), or in any combination thereof, as determined by the Committee.  
     Except as otherwise provided by the Committee, payments made with shares
     of Company stock shall be limited to shares held by the Participant for
     not less than six months prior to the payment date.

(d)  A Participant may elect to pay the purchase price (and satisfy the tax
     withholding obligation) upon the exercise of an Option through a cashless
     exercise arrangement to the extent provided by the Committee.

     2.4. Exercise.  Except as otherwise expressly provided in the Plan, an
Option granted under this Section 2 shall be exercisable in accordance with the
following terms of this subsection 2.4:

(a)  The terms and conditions relating to exercise of an Option shall be
     established by the Committee.

(b)  No Option may be exercised by a Participant: (i) prior to the date on
     which the Participant completes a minimum of one continuous year of
     employment with the Company or any Related Company after the date as of
     which the Option is granted (provided, however, that the Committee may
     permit earlier exercise following the Participant's Date of Termination by
     reason of death or being Disabled); or (ii) after the Expiration Date
     applicable to that Option.

(c)  The exercise of an Option will result in the surrender of the
     corresponding rights under a tandem Alternate Stock Right, if any.

     2.5. Expiration Date.  The "Expiration Date" with respect to an Option
means the date established as the Expiration Date by the Committee at the time
of the grant; provided, however, that the Expiration Date with respect to any
Option shall not be later than the earliest to occur of:

(a)  the ten-year anniversary of the date on which the Option is granted;

(b)  if the Participant's Date of Termination occurs for cause (as determined
     by the Committee), the Date of Termination;

(c)  if the Participant's Date of Termination occurs by reason of death,
     becoming Disabled, or Retirement, the ten-year anniversary of the date on
     which such Option is granted;

(d)  if the Participant's Date of Termination occurs for reasons other than
     Retirement, death, becoming Disabled, or cause, the three-month
     anniversary of such Date of Termination.



                                      3

<PAGE>   35



     2.6. Dividend Equivalents.  The Committee may award Dividend Equivalents
with respect to Non-Qualified Stock Options and, subject to the limitations of
the Code, with respect to Incentive Stock Options.  A Dividend Equivalent award
shall permit the Participant to earn an amount equal to dividends payable with
respect to the number of shares that are subject to the Option for the period
the Option is outstanding and unexercised.  The right to payment of such earned
dividends shall be subject to such restrictions and limitations as may be
imposed by the Committee.

                                  SECTION 3
                                      
                            ALTERNATE STOCK RIGHTS

     3.1. Definition.  Subject to the terms of this Section 3, an Alternate
Stock Right granted under the Plan is an Award that may be granted in tandem
with an Option, and entitles the Participant to receive, in cash or Stock (as
determined in accordance with subsection 3.4), value equal to all or a portion
of the excess of: (a) the Fair Market Value of a specified number of shares of
Stock at the time of exercise; over (b) the exercise price with respect to
shares under the tandem Option.

     3.2. Eligibility.  Subject to the provisions of the Plan, the Committee
may grant the holder of any Option awarded under the Plan an Alternate Stock
Right concurrent with, or subsequent to, the award of the Option.

     3.3. Exercise.  An Alternate Stock Right shall be exercisable at the time
the tandem Option is exercisable.  The exercise of an Alternate Stock Right
will result in the surrender of the corresponding rights under the tandem
Option.

     3.4. Settlement of Award.  Upon the exercise of an Alternate Stock Right,
the value to be distributed to the Participant, in accordance with subsection
3.1, shall be distributed in shares of Stock (valued at their Fair Market Value
at the time of exercise), in cash, or in a combination thereof, in the
discretion of the Committee.

     3.5. Expiration Date.  The "Expiration Date" for the Alternate Stock Right
shall be determined by the Committee, and shall not be later than the
Expiration Date for the related Option.

                                  SECTION 4
                                      
                               RESTRICTED STOCK

     4.1. Definition.  Subject to the terms of this Section 4, a Restricted
Stock Award under the Plan is a grant of shares of



                                      4


<PAGE>   36

Stock to a Participant, the eligibility for or vesting of which is subject to a
required period of employment and/or any other conditions established by the
Committee.

     4.2. Eligibility.  The Committee shall designate the Participants to whom
Restricted Stock Awards are to be granted, and the number of shares of Stock
that are subject to each such Award.

     4.3. Terms and Conditions of Awards.  All Restricted Stock Awards granted
to a Participant under the Plan shall be subject to the following terms and
conditions and to such other conditions, not inconsistent with the Plan, as
shall be prescribed by the Committee:

(a)  A Restricted Stock Award granted to a Participant may not be sold,
     assigned, transferred, pledged or otherwise encumbered, except as
     hereinafter provided, for a period of five years or such shorter period as
     the Committee may determine, but (subject to the provisions of Section 7,
     relating to Change in Control) not less than one year after the time of
     the grant of such Award; provided, however, that to the extent that, in
     addition to or in lieu of service-based vesting, the Award is subject to
     other vesting conditions (or other conditions on eligibility), the
     foregoing restrictions shall apply during the period in which the Award is
     not vested or during which such other conditions have not been satisfied
     (the "Restricted Period").  Except for such restrictions, the Participant
     as owner of such shares shall have all the rights of a shareholder,
     including but not limited to the right to vote such shares and, except as
     otherwise provided by the Committee, the right to receive all dividends
     paid on such shares.

(b)  The Committee may, at any time after the date of grant of a Restricted
     Stock Award, adjust the length of the Restricted Period to account for
     individual circumstances of a Participant or group of Participants, but
     (subject to the provisions of Section 7, relating to Change in Control),
     and subject to the Committee authority to grant Restricted Stock Awards
     with eligibility or vesting that is not based on service, in no case shall
     the length of the Restricted Period be less than one year.

(c)  Except as otherwise determined by the Committee, in its sole discretion,
     a Participant whose Date of Termination occurs prior to the end of the
     Restricted Period for any reason shall forfeit all shares of Restricted
     Stock remaining subject to such Restricted Period.



                                      5

<PAGE>   37



(d)  Each certificate issued in respect of shares of Restricted Stock awarded
     under the Plan shall be registered in the name of the Participant and, at
     the discretion of the Committee, each such certificate may be deposited in
     a bank designated by the Committee.  Each such certificate shall (to the
     extent applicable) bear the following (or a similar) legend:

     "The transferability of this certificate and the shares of stock
     represented hereby are subject to the terms and conditions (including      
     forfeiture) contained in the NICOR Inc. 1997 Long-Term Incentive Plan and
     an agreement entered into between the registered owner and NICOR Inc.  A
     copy of such plan and agreement is on file in the offices of the Secretary
     of NICOR Inc. at its principal executive offices."

4.4. Substitution of Cash.  The Committee may, in its discretion, substitute
cash equal to the Fair Market Value (determined as of the date of distribution)
of Stock otherwise required to be distributed to a Participant in accordance
with this Section 4.

4.5. Deferred Delivery.  The Committee may, in its discretion, establish
arrangements providing for deferred delivery of Restricted Stock, and may
provide that, as a condition of receiving such Restricted Stock Awards, the
Participant reduce eligible compensation otherwise payable to the Participant.

                                  SECTION 5
                                      
                              PERFORMANCE UNITS

     5.1. Definition.  Subject to the terms of this Section 5, the Award of
Performance Units under the Plan entitles the Participant to receive value for
the units at the end of a Performance Period to the extent provided under the
Award.  The number of units earned, and the value received for them, will be
contingent on the degree to which the "Performance Measures" established at the
time of grant of the Award are met.  For purposes of the Plan, the "Performance
Period" with respect to the award of any Performance Units shall be the period
over which the applicable performance is to be measured.

     5.2. Eligibility.  The Committee shall designate the Participants to whom
Performance Units are to be granted, and the number of units to be the subject
to each such Award.

     5.3. Terms and Conditions of Awards.  For each Award of Performance Units,
the Committee will determine:

(a)  the value of units, which may be stated in cash or in units representing
     shares of Stock, or may be stated as dividend



                                      6


<PAGE>   38

     equivalent rights (which dividend equivalent rights may, but need not be,
     associated with units representing shares of Stock);

(b)  the Performance Measures used for determining whether the Performance
     Units are earned;

(c)  the Performance Period during which the Performance Measures will apply;

(d)  the relationship between the level of achievement of the Performance
     Measures and the degree to which Performance Units are earned;

(e)  whether, during or after the Performance Period, any revision to the
     Performance Measures or Performance Period should be made to reflect
     significant events or changes that occur during the Performance Period
     (provided that, if the Award is intended to satisfy the requirements for
     performance-based compensation, any such revisions occurring after the
     establishment of the Performance Measures may not result in an increase in
     the amount of settlement of the Award);

(f)  the number of earned Performance Units to be paid in cash and the number
     of earned Performance Units to be paid in shares of Stock; and

(g)  the extent to which shares of Stock distributed in settlement of the
     units shall be subject to vesting requirements or other conditions.

     5.4. Settlement.  Settlement of units earned shall be wholly in cash,
wholly in Stock or in a combination of the two, to be distributed in a lump sum
or installments, as determined by the Committee.

(a)  For Performance Units stated in units representing shares of Stock when
     granted, one share of Stock will be distributed for each unit earned, or
     cash will be distributed for each unit earned equal to either (i) the Fair
     Market Value of a share of Stock at the end of the Performance Period or
     (ii) the average Stock value over a period determined by the Committee.

(b)  For Performance Units stated in cash when granted, the value of each unit
     earned will be distributed in its initial cash value, or shares of Stock
     will be distributed based on the cash value of the units earned divided by
     (i) the Fair Market Value of a share of Stock at the end of the
     Performance Period or (ii) the average Stock value over a period
     determined by the Committee.



                                      7

<PAGE>   39



(c)  For Performance Units stated as dividend equivalent rights when granted,
     the value of each unit earned at the end of the period shall be
     distributed in cash based on the dividends paid on Stock during the
     period, or shall be distributed in shares of Stock based on the amount of
     dividends paid on Stock during the period, divided by (i) the Fair Market
     Value of a share of Stock at the end of the Performance Period or (ii) the
     average Stock value over a period determined by the Committee.

     5.5. Performance-Based Compensation.  Except as otherwise provided in this
subsection 5.5, Performance Unit Awards are intended to be "performance-based
compensation", as that term is used in section 162(m) of the Code, and shall
comply with the following requirements of this subsection 5.5, to the extent
such compliance is determined by the Committee to be required for the
Performance Unit Awards to be treated as "performance-based compensation."

(a)  For Performance Units stated in units representing shares of Stock when
     granted, the number of shares covered by the Performance Unit Awards made
     to any Participant in any calendar year shall not exceed 200,000 shares of
     Stock (subject to adjustment in accordance with subsection 6.4).  For
     Performance Units stated in cash when granted and for units stated as
     dividend equivalents when granted, the combined value of both types of
     units covered by the Performance Unit Awards made to any Participant in
     any calendar year shall not exceed $600,000.  (For units stated as
     dividend equivalents, the foregoing limit shall be applied based on the
     maximum dollar amount payable for the units to the Participant at the end
     of the period, with such maximum to be established at the time of grant of
     the units.)  The restrictions of this paragraph (a) shall not apply to
     Performance Units that are not intended to satisfy the performance-based
     compensation requirements, as described in paragraph (c) next below.

(b)  For any Performance Unit Award, the Performance Measures established for
     the Performance Period shall be objective (as that term is described in
     regulations under Code section 162(m)), and shall be established in
     writing by the Committee not later than 90 days after the beginning of the
     Performance Period (but in no event after 25% of the Performance Period
     has elapsed), and while the outcome as to the Performance Measures is
     substantially uncertain.  The Performance Measures established by the
     Committee shall be based on one or more of the following specific
     performance goals: total shareholder return; return on equity; return on
     investment; cost management; growth objectives; and customer satisfaction.



                                      8

<PAGE>   40
(c)  The Committee, at the time of grant of a Performance Unit Award, may make
     settlement of a portion of the Award contingent on the achievement of such
     individual goals as may be established by the Committee; provided,
     however, that the portion of the Award that is contingent on achievement
     of individual goals is not intended to be performance-based compensation.
     Any other Performance Unit Awards granted under this Section 5 shall not
     be performance-based compensation, to the extent that the Committee, at
     the time of the grant of the Performance Units, designates such Awards as
     not being intended as performance-based compensation.  The provisions of
     this subsection 5.5, reflecting the requirements applicable to
     performance-based compensation, shall not apply to the portion of the
     Award, if any, which is not intended to satisfy the performance-based
     compensation requirements.

(d)  A Participant holding a Performance Unit Award shall not receive
     settlement of the Award until the Committee has determined, and certified
     in writing (by approved minutes or otherwise) that the applicable
     Performance Measures have been attained.  To the extent that the Committee
     exercises discretion in making the determination required by this
     paragraph (d), or otherwise provides for a discretionary adjustment with
     respect to the Award after the grant date, such exercise of discretion may
     not result in an increase in the amount of settlement of the Award.

(e)  If a Participant's Date of Termination occurs during a Performance Period
     applicable to any Performance Units granted to him:

     (i) If the Date of Termination occurs because of a Participant's death or
     being Disabled, or if the Performance Units are not intended to satisfy
     the requirements for performance-based compensation, the Committee may
     determine that the Participant will be entitled to settlement of all or
     any portion of the Performance Units as to which he would otherwise be
     entitled, and may accelerate the determination of the value and
     settlement of such Performance Units or make such other adjustments as
     the Committee, in its sole discretion, deems appropriate.

     (ii) Subject to Section 7, if the Date of Termination occurs for reasons
     other than the Participant's death or being Disabled, and the Performance
     Units are intended to satisfy the requirements for performance-based
     compensation, the Committee may determine that the Participant will be
     entitled to settlement of all or any portion of the Performance Units as
     to which he would otherwise be eligible, provided that any settlement of
     Performance Unit Awards shall not be made until the end of the Performance



                                      9


<PAGE>   41

      Period, and such settlement shall not exceed the settlement that the
      Participant would have received if the Participant's Date of Termination
      had occurred immediately after the end of the Performance Period.

                                  SECTION 6
                                      
                         OPERATION AND ADMINISTRATION
                                      
     6.1. Effective Date.  Subject to the approval of the shareholders of the
Company at the Company's 1997 annual meeting of its shareholders, the Plan
shall be effective as of January 28, 1997 (the "Effective Date"); provided,
however, that to the extent that Awards are made under the Plan prior to its
approval by shareholders, they shall be contingent on approval of the Plan by
the shareholders of the Company.  The Plan shall be unlimited in duration and,
in the event of Plan termination, shall remain in effect as long as any Awards
under it are outstanding; provided, however, that no Awards may be granted
under the Plan on a date that is more than ten years from the date the Plan is
adopted.

     6.2. Shares Subject to Plan.  The shares of Stock with respect to which
Awards may be made under the Plan shall be shares currently authorized but
unissued or currently held or subsequently acquired by the Company as treasury
shares, including shares purchased in the open market or in private
transactions.  Subject to the provisions of subsection 6.4, the number of
shares of Stock which may be issued with respect to Awards under the Plan shall
not exceed 2,000,000 (two million) shares in the aggregate (which includes
1,100,000 (one million one hundred thousand) shares which were reserved under
the 1989 NICOR Inc. Long-Term Incentive Plan but which will not be awarded
thereunder).  Except as otherwise provided herein, any shares subject to an
Award which for any reason expires or is terminated without issuance of shares
(whether or not cash or other consideration is paid to a Participant in respect
of such shares) shall again be available under the Plan.

     6.3. Individual Limits on Awards.  Notwithstanding any other provision of
the Plan to the contrary, no Participant shall receive any Award of an Option
or an Alternate Stock Right under the Plan to the extent that the sum of:

(a)  the number of shares of Stock subject to such Award;

(b)  the number of shares of Stock subject to all other prior Awards of
     Options and Alternate Stock Rights under the Plan within the one calendar
     year period that includes the date of the Award; and




                                      10
<PAGE>   42



(c)  the number of shares of Stock subject to all other prior stock options
     and alternate stock rights granted to the Participant under other plans or
     arrangements of the Company and Related Companies within the one calendar
     year period that includes the date of the Award;

would exceed the Participant's Individual Limit under the Plan.  Subject to the
provisions of subsection 6.4, the determination made under the foregoing
provisions of this subsection 6.3 shall be based on the shares subject to the
awards at the time of grant, regardless of when the awards become exercisable.
Subject to the provisions of subsection 6.4, a Participant's "Individual Limit"
for any calendar year shall be 200,000 (two hundred thousand) shares.

     6.4. Adjustments to Shares.

(a)  If the Company shall effect any subdivision or consolidation of shares of
     Stock or other capital readjustment, payment of stock dividend, stock
     split, combination of shares or recapitalization or other increase or
     reduction of the number of shares of Stock outstanding without receiving
     compensation therefor in money, services or property, then the Committee
     shall adjust (i) the number of shares of Stock available under the Plan;
     (ii) the number of shares available under any individual or other limits;
     (iii) the number of shares of Stock subject to outstanding Awards; and
     (iv) the per-share price under any outstanding Award to the extent that
     the Participant is required to pay a purchase price per share with respect
     to the Award.

(b)  If the Company is reorganized, merged or consolidated or is party to a
     plan of exchange with another corporation, pursuant to which
     reorganization, merger, consolidation or plan of exchange, the
     shareholders of the Company receive any shares of stock or other
     securities or property, or the Company shall distribute securities of
     another corporation to its shareholders, there shall be substituted for
     the shares subject to outstanding Awards an appropriate number of shares
     of each class of stock or amount of other securities or property which
     were distributed to the shareholders of the Company in respect of such
     shares, subject to the following:

     (i) If the Committee determines that the substitution described in 
     accordance with the foregoing provisions of this paragraph (b) would not
     be fully consistent with the purposes of the Plan or the purposes of the
     outstanding Awards under the Plan, the Committee may make such other
     adjustments to the Awards to the extent that the Committee determines such
     adjustments are consistent with the purposes of the Plan and of the
     affected Awards.



                                      11


<PAGE>   43



     (ii) All or any of the Awards may be cancelled by the Committee on or
     immediately prior to the effective date of the applicable transaction,
     but only if the Committee gives reasonable advance notice of the
     cancellation to each affected Participant, and only if either: (A) the
     Participant is permitted to exercise the Award for a reasonable period
     prior to the effective date of the cancellation; or (B) the Participant
     receives payment or other benefits that the Committee determines to be
     reasonable compensation for the value of the cancelled Awards.

     (iii) Upon the occurrence of a reorganization of the Company or any other
     event described in this paragraph (b), any successor to the Company shall
     be substituted for the Company to the extent that the Company and the
     successor agree to such substitution.

(c)  Upon (or, in the discretion of the Committee, immediately prior to) the
     sale to (or exchange with) a third party unrelated to the Company of all
     or substantially all of the assets of the Company, all Awards shall be
     cancelled.  If Awards are cancelled under this paragraph (c), then, with
     respect to any affected Participant, either:

     (i) the Participant shall be provided with reasonable advance notice of
     the cancellation, and the Participant shall be permitted to exercise the
     Award for a reasonable period prior to the effective date of the
     cancellation; or

     (ii) the Participant shall receive payment or other benefits that the
     Committee determines to be reasonable compensation for the value of the
     cancelled Awards.

     The foregoing provisions of this paragraph (c) shall also apply to the
     sale of all or substantially all of the assets of the Company to a
     related party, if the Committee determines such application is
     appropriate.

(d)  In determining what action, if any, is necessary or appropriate under the
     foregoing provisions of this subsection 6.4, the Committee shall act in a
     manner that it determines to be consistent with the purposes of the Plan
     and of the affected Awards and, where applicable or otherwise appropriate,
     in a manner that it determines to be necessary to preserve the benefits
     and potential benefits of the affected Awards for the Participants and the
     Company.

(e)  The existence of this Plan and the Awards granted hereunder shall not
     affect in any way the right or power of the Company or its shareholders to
     make or authorize any or all adjustments, recapitalizations,
     reorganizations or other



                                      12
<PAGE>   44

     changes in the Company's capital structure or its business, any merger or
     consolidation of the Company, any issue of bonds, debentures, preferred
     or prior preference stocks ahead of or affecting the Company's Stock or
     the rights thereof, the dissolution or liquidation of the Company, any
     sale or transfer of all or any part of its assets or business, or any
     other corporate act or proceeding, whether of a similar character or
     otherwise.

(f)  Except as expressly provided by the terms of this Plan, the issue by the
     Company of shares of stock of any class, or securities convertible into
     shares of stock of any class, for cash or property or for labor or
     services, either upon direct sale, upon the exercise of rights or warrants
     to subscribe therefor or upon conversion of shares or obligations of the
     Company convertible into such shares or other securities, shall not
     affect, and no adjustment by reason thereof shall be made with respect to
     Awards then outstanding hereunder.

(g)  Awards under the Plan are subject to adjustment under this subsection 6.4
     only during the period in which they are considered to be outstanding
     under the Plan.  For purposes of this subsection 6.4, an Award is
     considered "outstanding" on any date if the Participant's ability to
     obtain all benefits with respect to the Award is subject to limits imposed
     by the Plan (including any limits imposed by the Agreement reflecting the
     Award).  The determination of whether an Award is outstanding shall be
     made by the Committee.

     6.5. Limit on Distribution.  Distribution of shares of Stock or other
amounts under the Plan shall be subject to the following:

(a)  Notwithstanding any other provision of the Plan, the Company shall have
     no liability to deliver any shares of Stock under the Plan or make any
     other distribution of benefits under the Plan unless such delivery or
     distribution would comply with all applicable laws and the applicable
     requirements of any securities exchange or similar entity.

(b)  In the case of a Participant who is subject to Section 16(a) and 16(b) of
     the Securities Exchange Act of 1934, the Committee may, at any time, add
     such conditions and limitations to any Award to such Participant, or any
     feature of any such Award, as the Committee, in its sole discretion, deems
     necessary or desirable to comply with Section 16(a) or 16(b) and the rules
     and regulations thereunder or to obtain any exemption therefrom.



                                      13

<PAGE>   45



(c)  To the extent that the Plan provides for issuance of certificates to
     reflect the transfer of shares of Stock, the transfer of such shares may
     be effected on a non-certificated basis, to the extent not prohibited by
     applicable law or the rules of any stock exchange.

     6.6. Liability for Cash Payments.  Subject to the provisions of this
Section 6, each Related Company shall be liable for payment of cash due under
the Plan with respect to any Participant to the extent that such benefits are
attributable to the services rendered for that Related Company by the
Participant.  Any disputes relating to liability of a Related Company for cash
payments shall be resolved by the Committee.

     6.7. Withholding.  All Awards and other payments under the Plan are
subject to withholding of all applicable taxes, which withholding obligations
may be satisfied, with the consent of the Committee, through the surrender of
shares of Stock which the Participant already owns, or to which a Participant
is otherwise entitled under the Plan; provided, however, that the Committee may
require that shares surrendered to satisfy the withholding obligation be
limited to shares held by the Participant for not less than six months prior to
the withholding date.

     6.8. Transferability.  Options with or without Alternate Stock Rights,
Performance Units, and, during the Restricted Period, Restricted Stock awarded
under the Plan are not transferable except as designated by the Participant by
will or by the laws of descent and distribution.  To the extent that the
Participant who receives an Award under the Plan has the right to exercise such
Award, the Award may be exercised during the lifetime of the Participant only
by the Participant.  Notwithstanding the foregoing provisions of this
subsection 6.8, the Committee may permit Awards under the Plan to be
transferred by a Participant for no consideration to or for the benefit of the
Participant's Immediate Family (including, without limitation, to a trust for
the benefit of a Participant's Immediate Family or to a partnership for members
of a Participant's Immediate Family), subject to such limits as the Committee
may establish, and the transferee shall remain subject to all the terms and
conditions applicable to such Award prior to such transfer.  In the discretion
of the Committee, the foregoing right to transfer Awards shall also apply to
the right to transfer ancillary rights associated with an Award.  However, in
no event shall an Incentive Stock Option be transferable to the extent that
such transferability would violate the requirements applicable to such option
under Code section 422.

     6.9. Notices.  Any notice or document required to be filed with the
Committee under the Plan will be properly filed if delivered or mailed by
registered mail, postage prepaid, to the Committee, in care of the Company, at
its principal executive



                                      14


<PAGE>   46

offices.  The Committee may, by advance written notice to affected persons,
revise such notice procedure from time to time.  Any notice required under the
Plan (other than a notice of election) may be waived by the person entitled to
notice.

     6.10. Form and Time of Elections.  Unless otherwise specified herein, each
election required or permitted to be made by any Participant or other person
entitled to benefits under the Plan, and any permitted modification or
revocation thereof, shall be in writing filed with the Committee at such times,
in such form, and subject to such restrictions and limitations, not
inconsistent with the terms of the Plan, as the Committee shall require.

     6.11. Agreement With Company.  At the time of an Award to a Participant
under the Plan, the Committee may require a Participant to enter into an
agreement with the Company (the "Agreement") in a form specified by the
Committee, agreeing to the terms and conditions of the Plan and to such
additional terms and conditions, not inconsistent with the Plan, as the
Committee may, in its sole discretion, prescribe.

     6.12. Limitation of Implied Rights.

(a)  Neither a Participant nor any other person shall, by reason of the Plan,
     acquire any right in or title to any assets, funds or property of the
     Company or any Related Company whatsoever, including, without limitation,
     any specific funds, assets, or other property which the Company or any
     Related Company, in their sole discretion, may set aside in anticipation
     of a liability under the Plan.  A Participant shall have only a
     contractual right to the amounts, if any, payable under the Plan,
     unsecured by any assets of the Company or any Related Company.  Nothing
     contained in the Plan shall constitute a guarantee by any of the Company
     or any Related Company that the assets of such companies shall be
     sufficient to pay any benefits to any person.

(b)  The Plan does not constitute a contract of employment, and selection as a
     Participant will not give any employee the right to be retained in the
     employ of the Company or any Related Company, nor any right or claim to
     any benefit under the Plan, unless such right or claim has specifically
     accrued under the terms of the Plan.  Except as otherwise provided in the
     Plan, no Award under the Plan shall confer upon the holder thereof any
     right as a shareholder of the Company prior to the date on which he
     fulfills all service requirements and other conditions for receipt of such
     rights.

     6.13. Evidence.  Evidence required of anyone under the Plan may be by
certificate, affidavit, document or other information



                                      15


<PAGE>   47

which the person acting on it considers pertinent and reliable, and signed,
made or presented by the proper party or parties.

     6.14. Action by Company or Related Company.  Any action required or
permitted to be taken by the Company or any Related Company shall be by
resolution of its board of directors, or by action of one or more members of
the board (including a committee of the board) who are duly authorized to act
for the board, or (except to the extent prohibited by applicable law or the
rules of any stock exchange) by a duly authorized officer of the company.

     6.15. Gender and Number.  Where the context admits, words in any gender
shall include any other gender, words in the singular shall include the plural
and the plural shall include the singular.

                                  SECTION 7

                               CHANGE IN CONTROL

     Subject to the provisions of subsection 6.4 (relating to the adjustment of
shares), and except as otherwise provided in the Agreement reflecting the
applicable Award, upon the occurrence of a Change in Control:

(a)  All outstanding Options (including any outstanding tandem Alternate Stock
     Rights) shall become fully exercisable.

(b)  All Restricted Stock Awards shall become fully vested.

(c)  Performance Units may be paid out in such manner and amounts as
     determined by the Committee.

                                  SECTION 8

                                  COMMITTEE

     8.1. Administration.  The authority to control and manage the operation
and administration of the Plan shall be vested in a committee (the "Committee")
in accordance with this Section 8.

     8.2. Selection of Committee.  The Committee shall be selected by the
Board, and shall consist of two or more members of the Board.

     8.3. Powers of Committee.  The authority to manage and control the
operation and administration of the Plan shall be vested in the Committee,
subject to the following:

(a)  Subject to the provisions of the Plan, the Committee will have the
     authority and discretion to select employees to



                                      16
 

<PAGE>   48

     receive Awards, to determine the time or times of receipt, to determine
     the types of Awards and the number of shares covered by the Awards, to
     establish the terms, conditions, performance criteria, restrictions, and
     other provisions of such Awards, and (subject to the restrictions imposed
     by Section 9) to cancel or suspend Awards.  In making such Award
     determinations, the Committee may take into account the nature of
     services rendered by the respective employee, his present and potential
     contribution to the Company's success and such other factors as the
     Committee deems relevant.

(b)  Subject to the provisions of the Plan, the Committee will have the
     authority and discretion to determine the extent to which Awards under the
     Plan will be structured to conform to the requirements applicable to
     performance-based compensation as described in Code section 162(m), and to
     take such action, establish such procedures, and impose such restrictions
     at the time such Awards are granted as the Committee determines to be
     necessary or appropriate to conform to such requirements.

(c)  The Committee will have the authority and discretion to interpret the
     Plan, to establish, amend, and rescind any rules and regulations relating
     to the Plan, to determine the terms and provisions of any agreements made
     pursuant to the Plan, and to make all other determinations that may be
     necessary or advisable for the administration of the Plan.

(d)  Any interpretation of the Plan by the Committee and any decision made by
     it under the Plan is final and binding on all persons.

(e)  Except as otherwise expressly provided in the Plan, where the Committee
     is authorized to make a determination with respect to any Award, such
     determination shall be made at the time the Award is made, except that the
     Committee may reserve the authority to have such determination made by the
     Committee in the future (but only if such reservation is made at the time
     the Award is granted and is expressly stated in the Agreement reflecting
     the Award).

(f)  In controlling and managing the operation and administration of the Plan,
     the Committee shall act by a majority of its then members, by meeting or
     by writing filed without a meeting.  The Committee shall maintain and keep
     adequate records concerning the Plan and concerning its proceedings and
     acts in such form and detail as the Committee may decide.

     8.4. Delegation by Committee.  Except to the extent prohibited by
applicable law or the rules of any stock exchange,



                                      17
<PAGE>   49

the Committee may allocate all or any portion of its responsibilities and
powers to any one or more of its members and may delegate all or any part of
its responsibilities and powers to any person or persons selected by it.  Any
such allocation or delegation may be revoked by the Committee at any time.

     8.5. Information to be Furnished to Committee.  The Company and Related
Companies shall furnish the Committee with such data and information as may be
required for it to discharge its duties.  The records of the Company and
Related Companies as to an employee's or Participant's employment, termination
of employment, leave of absence, reemployment and compensation shall be
conclusive on all persons unless determined to be incorrect.  Participants and
other persons entitled to benefits under the Plan must furnish the Committee
such evidence, data or information as the Committee considers desirable to
carry out the terms of the Plan.

                                  SECTION 9

                           AMENDMENT AND TERMINATION

     The Board may, at any time, amend or terminate the Plan, provided that,
subject to subsection 6.4 (relating to certain adjustments to shares), no
amendment or termination may, in the absence of written consent to the change
by the affected Participant (or, if the Participant is not then living, the
affected beneficiary), adversely affect the rights of any Participant or
beneficiary under any Award granted under the Plan prior to the date such
amendment is adopted by the Board, and further provided that, subject to
subsection 6.4, no amendment of the Plan may increase the total number of
shares of Stock with respect to which Awards may be made under the Plan.

                                  SECTION 10

                                 DEFINED TERMS

     For purposes of the Plan, the terms listed below shall be defined as
follows:

(a)  Award.  The term "Award" shall mean any award or benefit granted to any
     Participant under the Plan, including, without limitation, the grant of
     Options (including Dividend Equivalents which may be granted under the
     Plan in connection with Options), Alternate Stock Rights, Restricted Stock
     Awards, or Performance Units.

(b)  Board.  The term "Board" shall mean the Board of Directors of the
     Company.



                                      18


<PAGE>   50



(c)  Cashless Exercise.  The "cashless exercise" of an Option is an Option
     exercise whereby the Participant may elect to pay the purchase price
     through the following procedures: The Participant shall notify the
     Corporate Secretary of the intent to exercise.  Written instructions will
     then be prepared and delivered to the Company and the broker indicating
     the Participant's cashless exercise election and instructing the Company
     to deliver to the broker the Common Stock issuable upon exercise.  The
     exercise of the Option will be executed on the same day that the broker is
     able to sell the stock.  The broker will withhold from the proceeds of the
     sale and deliver to the Company an amount, in cash, equal to the Option
     exercise price.  An additional amount for Federal and state tax
     withholdings may also be withheld and delivered to the Company at the
     Participant's election.

(d)  Change in Control.  The term "Change in Control" means the occurrence of
     any of the following:

     (i) Any "person" (as such term is used in Section 13(d) and 14(d)(2) of
     the Securities Exchange Act of 1934) is or becomes a beneficial owner,
     directly or indirectly, of stock of the Company representing 20 (twenty)
     percent or more of the total voting power of the Company's then
     outstanding stock; but excluding, for this purpose, any such acquisition
     by the Company, any Related Company, or any employee benefit plan (or
     related trust, or a fiduciary of the plan or trust) maintained by the
     Company or any Related Company.

     (ii) A tender offer (for which a filing has been made with the SEC which
     purports to comply with the requirements of Section 14(d) of the
     Securities Exchange Act of 1934 and the corresponding SEC rules) is made
     for the stock of the Company, which has not been negotiated and approved
     by the Board, provided that in case of a tender offer described in this
     paragraph (ii), the Change in Control will be deemed to have occurred
     upon the first to occur of (A) any time during the offer when the person
     (using the definition in paragraph (i) above) making the offer
     beneficially owns or has accepted for payment stock of the Company with
     25 percent or more of the total voting power of the Company's outstanding
     stock or (B) three business days before the offer is to terminate unless
     the offer is withdrawn first, if the person making the offer could own,
     by the terms of the offer plus any shares beneficially owned by this
     person, stock with 50 percent or more of the total voting power of the
     Company's outstanding stock when the offer terminates.

     (iii) Individuals who were the Board's nominees for election as directors
     of the Company immediately prior to a meeting of the shareholders of the
     Company involving a



                                      19


<PAGE>   51

     contest for the election of directors shall not constitute a majority of
     the Board following the election.

     For purposes of this paragraph (d), (I) the term "Company" shall mean
     NICOR Inc. and shall include any Successor to NICOR Inc.; (II) the term
     "Successor to NICOR Inc." shall mean any corporation, partnership, joint
     venture or other entity that succeeds to the interests of NICOR Inc. by
     means of a merger, consolidation, or other restructuring that does not
     constitute a Change in Control under paragraphs (i), (ii), (iii) or (iv)
     next above; and (III) "beneficial ownership" shall be determined in
     accordance with Rule 13d-3 issued under the Securities Exchange Act of
     1934.

(e)  Code.  The term "Code" means the Internal Revenue Code of 1986, as
     amended.  A reference to any provision of the Code shall include reference
     to any successor provision of the Code.

(f)  Date of Termination.  A Participant's "Date of Termination" shall be the
     date on which his employment with the Company and all Related Companies
     terminates for any reason; provided that a Date of Termination shall not
     be deemed to occur by reason of a transfer of the Participant between the
     Company and a Related Company or between two Related Companies; and
     further provided that a Participant's employment shall not be considered
     terminated while the Participant is on a leave of absence from the Company
     or a Related Company approved by the Participant's employer.  If, as a
     result of a sale or other transaction, a Participant's employer ceases to
     be a Related Company (and the Participant's employer is or becomes an
     entity that is separate from the Company), the occurrence of such
     transaction shall be treated as the Participant's Date of Termination.

(g)  Disabled.  Except as otherwise provided by the Committee, "Disabled"
     means the inability of a Participant, by reason of a medically
     determinable physical or mental impairment, to engage in any substantial
     gainful activity, which condition, in the opinion of a physician selected
     by the Committee, is expected to be total and permanent during the
     remainder of the Participant's lifetime.

(h)  Fair Market Value.  The "Fair Market Value" of a share of Stock of the
     Company as of any date shall be the closing market composite price for
     such Stock as reported for the New York Stock Exchange - Composite
     Transactions on that date or, if Stock is not traded on that date, on the
     next preceding date on which Stock was traded.



                                      20

<PAGE>   52



(i)  Immediate Family.  With respect to a particular Participant, the term
     "Immediate Family" shall mean the Participant's spouse, children,
     stepchildren, and adoptive relationships.

(j)  Option.  The term "Option" shall mean any Incentive Stock Option or
     Non-Qualified Stock Option granted under the Plan.

(k)  Related Companies.  The term "Related Company" means any company during
     any period in which it is a "parent corporation" or a "subsidiary company"
     (as those terms are defined in Code sections 424(e) and 424(f),
     respectively) with respect to the Company.

(l)  Retirement.  "Retirement" of a Participant shall mean the occurrence of a
     Participant's Date of Termination: (i) following the Participant's
     attainment of age 65; (ii) because the Participant is Disabled; or (iii)
     under circumstances that constitute an early retirement pursuant to any
     plan of the Company or a Related Company that covers the Participant and
     is qualified under section 401(a) of the Code.

(m)  SEC.  "SEC" shall mean the Securities and Exchange Commission.

(n)  Stock.  The term "Stock" shall mean shares of common stock of the
     Company.



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