SETTLEMENT AGREEMENT William B. Conway, Jr. (the "Employee") and Illinova Corporation (the "Company") have entered into a "Retention Agreement" dated April 12, 1999. For greater certainty as to certain compensation, payments, and benefits which may be provided under the Retention Agreement, the parties to the Retention Agreement wish to enter into this Agreement. Accordingly, the Employee and the Company agree that, effective December 15, 1999 (the "Effective Date"), the provisions set forth in this Settlement Agreement will apply: 1. BENEFITS SCHEDULE. By execution of this Settlement Agreement, the Employee agrees that the revisions described in Supplement A (the "Benefits Schedule") which is attached to and forms a part of this Settlement Agreement shall apply. (For purposes of this Settlement Agreement, the term "Settlement Agreement" shall include the Benefits Schedule.) The Employee acknowledges that the amounts payable to the Employee under this Settlement Agreement, and under the Retention Agreement as modified by this Settlement Agreement, are in excess of the amounts which would have been payable to the Employee under the Retention Agreement absent modification by this Settlement Agreement. 2. ACCELERATION AUTHORIZED. The Employee authorizes the Company to accelerate, into calendar year 1999, payments that may otherwise have been payable after 1999 under Company compensation arrangements, including, without limitation, the Illinova Executive Incentive Compensation Plan, Illinova Long Term Incentive Compensation Plan, and the Illinova Corporation Supplemental Pension Plan applicable to the Employee (the "Supplemental Plan"), but not including the Company's health, life, or disability plans (which would not be accelerated), in accordance with determinations made by the Company. In addition, the Company may, in its sole discretion, accelerate severance payments that may otherwise be due to the Employee upon termination of employment under any agreement with the Company or any plan or arrangement maintained by the Company. The Company may, in its discretion, limit the amount accelerated on behalf of the Employee to the extent it determines that the acceleration would result in payments that would not be tax deductible by reason of section 162(m) of the Internal Revenue Code (relating to the $1 million limit on deductible compensation). If any payment otherwise due (or which may become due) to the Employee in a later year under the Retention Agreement, this Settlement Agreement, or any other Company compensation arrangement is accelerated into 1999 under this Settlement Agreement, there shall be a corresponding reduction in the Company's obligation to make payments to the Employee under that agreement or arrangement in the later year. As soon as practicable after such acceleration occurs, the Company will provide the Employee with a schedule of the amount of the acceleration and the specific compensation, benefits, and payments that were canceled as a result of the acceleration. Any obligation that is accelerated under any agreement or arrangement will be subject to a present value adjustment, and any obligation that is accelerated under the Supplemental Plan will be subject to an actuarial adjustment to reflect such acceleration. 3. RESTRICTIONS ON ACCELERATION. If approved by the Board of Directors of the Company, the Company will endeavor to accelerate amounts into calendar year 1999 so that the Employee's benefits will not be reduced in accordance with the provisions of section 9 of the Retention Agreement, to the extent that the Company determines that such amounts would otherwise become due to the Employee in a later year. However, the Company and the Employee agree that the provisions of section 9 of the Retention Agreement shall continue to apply, notwithstanding the provisions of this Settlement Agreement. 4. GOOD REASON. The Employee acknowledges that (i) entering into this Settlement Agreement does not constitute a change in the nature or scope of the Employee's authority, and does not otherwise constitute a basis for "Good Reason" under the Retention Agreement (as in effect both prior to and after amendment by this Settlement Agreement), and (ii) the amendment of the Retention Agreement by this Settlement Agreement constitutes an amendment of the Retention Agreement that reflects the mutual written agreement of the parties to the Retention Agreement, and the Employee hereby waives any and all rights to assert the contrary. 5. AFFILIATES. For purposes of this Settlement Agreement, the term "Affiliate" shall mean any "affiliate" of the Company as that term is defined in Rule 12b-2 under the Securities Exchange Act of 1934. 6. OTHER COMPENSATION. Except for the covenants and agreements set forth in this Settlement Agreement, the Employee has received and will receive no additional compensation or any other type of remuneration from the Company in consideration of the elections and waivers made pursuant to this Settlement Agreement. Notwithstanding any provision of this Settlement Agreement or the Retention Agreement to the contrary, the benefits payable to the Employee under this Settlement Agreement shall be in lieu of, and not in addition to, any benefits to which the Employee might otherwise be entitled under any other severance plan or arrangement maintained by the Company. The acceleration of compensation under sections 2 and 3 will be disregarded for purposes of the Illinois Power Company Retirement Income Plan for Salaried Employees, the Supplemental Plan, and all other plans and arrangements, and will not increase the Employee's benefits under any such plan or arrangement. The Employee acknowledges that he or she will have no control over what the Company may do with the amounts, if any, waived pursuant to this Settlement Agreement. 7. TAX RETURNS. The Employee agrees to employ PricewaterhouseCoopers to prepare his or her personal income tax returns for calendar years 1999 and 2000. The Company will reimburse the Employee for the cost of such preparation. 8. RIGHT OF REVOCATION. (a) The Employee may revoke this Settlement Agreement by filing, prior to the Effective Date, with Kim Leftwich, Vice President, a written revocation signed by the Employee stating "I revoke my acceptance of the Settlement Agreement that would otherwise become effective December 15, 1999." Unless the Employee has revoked this Settlement Agreement by the Effective Date, and except as otherwise provided in section 8(b), this Settlement Agreement will become irrevocable on the Effective Date. (b) If the Company does not accelerate in accordance with sections 2 and 3, then, for a period of 14 days following the date written notice is provided to the Employee (by mailing to the Employee's last residence address indicated in the Company's records) of the Company's determination not to accelerate, the Employee shall be entitled to revoke this Settlement Agreement by filing, prior to the 15th day following provision by the Company of such written notice a written revocation signed by the Employee stating "I revoke my acceptance of the Settlement Agreement that became effective December 15, 1999." /s/ William B. Conway Jr. William B. Conway Jr. December 14, 1999 - ------------------------------ ----------------------- ------------------- SIGNATURE PRINT NAME DATE THIS FORM MUST BE RETURNED TO THE ILLINOIS POWER COMPANY, KIM B. LEFTWICH, VICE PRESIDENT, AT 500 SOUTH 27 STREET, DECATUR, ILLINOIS 62521, BY 5:00 P.M. ON DECEMBER 15, 1999 AND SHALL BECOME IRREVOCABLE AT THAT TIME. Supplement A BENEFITS SCHEDULE This Benefits Schedule is attached to and is a part of the Settlement Agreement between William B. Conway, Jr. (the "Employee") and Illinova Corporation (the "Company") dated December 14, 1999, and sets forth certain rights to compensation, benefits, and payments under the Retention Agreement between the Employee and the Company dated April 12, 1999 (the "Retention Agreement"). The Employee and the Company agree that the provisions set forth in this Benefits Schedule will apply: A-1. CHANGE IN CONTROL BENEFITS. The following shall be substituted for section 1(a)(II) of the Retention Agreement: "(II) The amount of the Employee's annual award under the Illinova Executive Incentive Compensation Plan for calendar year 1999 (which ordinarily would be paid in March, 2000, but may be paid in December 1999)." A-2. WELFARE BENEFITS. The following shall be substituted for section 1(d) of the Retention Agreement: "(d) WELFARE PLAN CONTINUATION. The Employee and his or her dependents shall be eligible for coverage under the health (including medical and dental) plan, life insurance plan, and disability plan (if any) provided to full-time employees of Illinois Power Company (or its successor) from time to time, subject to the same requirements and limitations as are applicable to full-time employees (including, without limitation, any requirement for employee contributions to pay premiums for such coverage). Eligibility for each of such health coverage, life insurance coverage, and disability coverage, respectively, shall continue until the earliest of: (i) The first day the Employee becomes eligible for health coverage, life insurance coverage, or disability coverage, respectively, under a plan or arrangement of the Employee's new employer. (ii) In the case of health coverage and life insurance coverage, if the Employee has attained age 50 but has not attained age 52 on the date of termination, the Employee's 55th birthday; and if the Employee has not attained age 50, or is older than age 52 on the date of termination, the three-year anniversary of the Employee's Termination Event. In the case of disability coverage, the three-year anniversary of the Employee's Termination Event. (iii) The date the Employee attains age 65. Medical coverage provided under this section 1(d) shall be counted towards the Company's obligation to provide coverage under the provisions of section 4980B of the Internal Revenue Code and section 601 of the Employee Retirement Income Security Act (sometimes referred to as "COBRA coverage"). If, either: (a) the Employee has attained age 50 but has not attained age 55 on the date of termination of employment, and the Employee's medical and life coverage under this section 1(d) are continued until the Employee attains age 55, or (b) the Employee has attained age 55 on or before the date of termination of employment, then the Employee and his or her dependents, if any, shall be eligible to participate in any benefit plans of the Company which provide health and life or similar benefits coverage as are then extended to employees of the Company electing early retirement at age 55 on the same terms and subject to the same conditions as are applicable to such employees; provided that such coverage shall not be furnished if the Employee waives coverage by giving written notice of waiver to the Company. Nothing in the Settlement Agreement (including this Benefits Schedule) shall be construed to limit the right which the Company otherwise has to amend or termination any health, life or other plan covering the Company's employees (or their dependents)." A-3. LONG-TERM INCENTIVE PAYMENT. If (i) the Employee is employed through December 31, 1999; or (ii) the Employee's employment is terminated prior to that date by the Company without Good Cause (as defined in the Retention Agreement); then the Company shall provide the Employee with an award for each of the three performance periods currently in effect (January 1, 1999 through December 31, 1999; January 1, 1999 through December 31, 2000; and January 1, 1999 through December 31, 2001). The determination of the performance for the periods will be determined near the end of 1999, and will be equal to the performance figures available as of the date of such determination, with such performance deemed to have continued through the end of the performance periods, as determined by the Compensation Committee of the Board of Directors of the Company. The amount of the benefit payable under this section A-3 to the Employee for each of these performance periods shall be equal to the amount that would be payable on such performance for the entire period, but subject to a pro-rata reduction to reflect the portion of the performance period after December 31, 1999, in accordance with the following schedule: - -------------------------------------------------------------------------------------------------------------------- For the Performance Period: The following percent of the total award that is determined to be payable by the Company for the Performance Period shall be: - -------------------------------------------------------------------------------------------------------------------- January 1, 1999 through December 31, 1999 100% - -------------------------------------------------------------------------------------------------------------------- January 1, 1999 through December 31, 2000 50% - -------------------------------------------------------------------------------------------------------------------- January 1, 1999 through December 31, 2001 33% - -------------------------------------------------------------------------------------------------------------------- Except as provided in this section A-3, the Employee shall not be entitled to any amounts with respect to the Long-Term Incentive Plan for any period. A-4. Compensation Cessation. Except as otherwise specifically provided in this Settlement Agreement, or the provisions of Retention Agreement (excluding section 1(d) as in effect prior to amendment by this Settlement Agreement), the Employee shall not be eligible for any compensation or benefits for periods after the Employee's date of termination. Nothing in this Settlement Agreement or the Retention Agreement shall be construed to give the Employee any right to be reemployed or otherwise retained by the Company or an Affiliate after such termination of employment. However, the Employee, if reemployed, shall be eligible for such compensation and benefits, and shall be eligible for participation in such benefit plans and arrangements, with respect to any such reemployment as may be agreed upon by the Employee and the employer, and shall be subject to the terms that may be applicable to the Employee under any such plan or arrangement.