ILLINOIS POWER CO
11-K, 2000-06-29
ELECTRIC & OTHER SERVICES COMBINED
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                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                    FORM 11-K

                   ANNUAL REPORT PURSUANT TO SECTION 15(d) OF
                       THE SECURITIES EXCHANGE ACT OF 1934

                   For the fiscal year ended December 31, 1999

                          Commission file number 1-3004



                             Illinois Power Company
                             Incentive Savings Plan
                            (Full title of the plan)




                              Illinova Corporation
                              500 South 27th Street
                             Decatur, Illinois 62525


                     (Name of issuer of the securities held
                      pursuant to the plan and the address
                       of its principal executive office.)



<PAGE>




                             ILLINOIS POWER COMPANY
                             INCENTIVE SAVINGS PLAN



                              FINANCIAL STATEMENTS
                           AND ADDITIONAL INFORMATION




                                DECEMBER 31, 1999




 <PAGE>



                             ILLINOIS POWER COMPANY
                             INCENTIVE SAVINGS PLAN


            Index to Financial Statements and Additional Information

Financial Statements:                                                 Page

      Report of Independent Accountants                                 1

      Statement of Net Assets Available for Benefits                    2
      December 31, 1999 and 1998


      Statement of Changes in Net Assets Available for
      Benefits for the years ended                                      3
      December 31, 1999 and 1998

      Notes to Financial Statements                                     4-14

Additional Information:

       Schedule I - Schedule of Assets Held for Investment Purposes



       Note:      Other schedules required by section 2520.103-10 of the
                  Department of Labor Rules and Regulations for Reporting and
                  Disclosure under ERISA have been omitted because they are
                  not applicable.


<PAGE>


                        Report of Independent Accountants



To the Participants and Administrator of
The Illinois Power Company
Incentive Savings Plan



In our opinion, the accompanying  statement of net assets available for benefits
and the  related  statement  of  changes in net assets  available  for  benefits
present fairly, in all material respects,  the net assets available for benefits
of the Illinois  Power Company  Incentive  Savings Plan (the "Plan") at December
31, 1999 and 1998, and the changes in net assets  available for benefits for the
years then ended in conformity with accounting  principles generally accepted in
the United States.  These  financial  statements are the  responsibility  of the
Plan's  management;  our  responsibility  is to  express  an  opinion  on  these
financial  statements  based on our  audits.  We  conducted  our audits of these
statements  in  accordance  with auditing  standards  generally  accepted in the
United  States,  which  require  that we plan and  perform  the  audit to obtain
reasonable assurance about whether the financial statements are free of material
misstatement.  An audit includes examining, on a test basis, evidence supporting
the  amounts  and  disclosures  in  the  financial  statements,   assessing  the
accounting  principles  used and significant  estimates made by management,  and
evaluating the overall  financial  statement  presentation.  We believe that our
audits provide a reasonable basis for the opinion expressed above.

As explained in Note 1 to the financial statements,  Illinois Power Company sold
its Clinton Nuclear Power Plant ("Clinton") to AmerGen Energy Company("Amergen")
on December 15, 1999. Under terms of the sales agreement,  the Plan accounts for
Clinton employees were transferred to AmerGen on January 21, 2000.

Our audits  were  conducted  for the  purpose of forming an opinion on the basic
financial statements taken as a whole. The supplemental  schedule of Assets Held
for Investment  Purposes is presented for the purpose of additional analysis and
is not a required part of the basic  financial  statements but is  supplementary
information  required by the  Department  of Labor's Rules and  Regulations  for
Reporting and Disclosure  under the Employee  Retirement  Income Security Act of
1974. This supplemental schedule is the responsibility of the Plan's management.
The supplemental  schedule has been subjected to the auditing procedures applied
in the audits of the basic financial  statements and, in our opinion,  is fairly
stated in all material  respects in relation to the basic  financial  statements
taken as a whole.




PricewaterhouseCoopers, LLP
June 23, 2000


                                       1
<PAGE>

ILLINOIS POWER COMPANY
INCENTIVE SAVINGS PLAN


Statement of Net Assets Available for Benefits

<TABLE>
                 <S>                            <C>                     <C>

                                                     December 31,
                                                1999                    1998

ASSETS:
   Cash and Temporary Cash Investments    $    778,291             $    350,597
   Investments at Fair Value               226,773,748              173,223,313
  Participant Loans                          4,133,430                4,190,017
                                          ------------             ------------
       Total Investments                   231,685,469              177,763,927

   Dividends and Interest Receivable             1,596                    1,413
   Employee Contributions Receivable           259,160                  374,692
   Employer Contributions Receivable         3,343,289                  199,698
                                          ------------             ------------
       Other Assets                          3,604,045                  575,803
                                          ------------             ------------
   Total Assets                            235,289,514              178,339,730
                                          ------------             ------------

LIABILITIES:
   Accrued Expenses                                  0                   57,906
  Transfer to AmerGen (Note 1)              61,210,672                        0
                                          ------------             ------------
   Total Liabilities                        61,210,672                   57,906
                                          ------------             ------------
NET ASSETS AVAILABLE FOR BENEFITS         $174,078,842             $178,281,824
                                          ============             ============

</TABLE>

                 See Accompanying Notes to Financial Statements



                                       2
<PAGE>

ILLINOIS POWER COMPANY
INCENTIVE SAVINGS PLAN

Statement of Changes in Net Assets Available for Benefits
<TABLE>
               <S>                             <C>                    <C>
                                                    December 31,
Sources of Participants' Equity:              1999                    1998
                                              ----                    ----
   Contributions:
         Employee                        $9,573,968               $9,534,379
         Employer                         5,841,996                1,599,690
                                        ------------             ------------
                                         15,415,964               11,134,069
                                        ------------             ------------

Plan-to-Plan Transfers                      626,204                1,074,726

   Investment Income:
     Dividend and Interest Income        19,248,968               13,734,280
     Net Appreciation in Fair Value of
      Investments                        30,137,923               10,051,625
                                        ------------             ------------
                                         49,386,891               23,785,905
                                       ------------             ------------
Application of Participants' Equity:
     Distributions to Active and
      Terminated Participants             8,380,075                7,953,357
      Administrative and Miscellaneous
       Expenses                              41,294                  104,884
                                         ----------             ------------
                                          8,421,369                8,058,241
                                       ------------             ------------

Increase in Net Assets
   Available for Benefits                57,007,690               27,936,459

Transfer to AmerGen (Note 1)            (61,210,672)                       0

Net Assets Available for Benefits,
   Beginning of Year                    178,281,824              150,345,365
                                       ------------             ------------
Net Assets Available for Benefits,
   End of Year                         $174,078,842             $178,281,824
                                       ============             ============
</TABLE>

                 See Accompanying Notes to Financial Statements


                                       3
<PAGE>


                             ILLINOIS POWER COMPANY
                             INCENTIVE SAVINGS PLAN


                          NOTES TO FINANCIAL STATEMENTS

NOTE 1 - DESCRIPTION OF PLAN:

       General:

       The Illinois Power Company Incentive Savings Plan (the Plan) is sponsored
and  administered  by Illinois  Power  Company  (the  Company).  The Plan became
effective  as of June 1,  1984.  Assets  of the Plan are held and  managed  by a
Trustee.  Effective July 1, 1995,  Fidelity  Management Trust Company of Boston,
Massachusetts became trustee and custodian. The purpose of the Plan is to enable
participants  to invest a portion  of their  salaries  in  tax-deferred  savings
pursuant to section  401(k) of the  Internal  Revenue  Code  (IRC).  The Plan is
subject to and in  compliance  with the  provisions  of the Employee  Retirement
Income Security Act of 1974 (ERISA) as amended.

       Participation:

       All salaried  employees of the Company are eligible to participate in the
Plan. In addition,  all employees of Illinois Power  Company's  parent  company,
Illinova Corporation  (Illinova),  are eligible to participate,  as are salaried
employees of Illinova's other subsidiary companies.  Participation is voluntary.
Active  participation  ceases upon  termination of employment  with the Company.
Former  employees can choose to liquidate their accounts or to leave them in the
Plan. Earnings will continue to accrue on undistributed  accounts. All accounts,
whether for active or former employees, are fully vested.

       Plan Changes and Amendments:

       Effective January 1, 1999, the Company match  contribution was increased.
The Company  had  previously  matched 50% of the first $80 of the  participants'
monthly before tax contributions and 25% of the balance of the contributions for
the month,  up to 6% of the  employee's  base earnings for the month.  Effective
January 1, 1999,  the Company began  matching 50% of the  participants'  monthly
before tax  contributions,  up to 6% of the  employee's  base  earnings  for the
month.
       Effective  December 15,  1999,  Illinois  Power sold its Clinton  Nuclear
Power  Plant to  AmerGen  Energy  Company  (AmerGen).  Under  terms of the sales
agreement,  the plan accounts for Clinton employees were transferred to AmerGen.
Effective  January  21,  2000,   $61,210,672  in  participants'   accounts  were
transferred  to AmerGen.  Incentive  compensation  contributions  due to Clinton
employees   were  later  posted  to  their  Illinois  Power  accounts  and  then
transferred to AmerGen in February and March of 2000.
       Amergen's plan would not accept transfer of the Fidelity  Brokerage Link.
Employees who participated in this option were asked to liquidate their accounts
and transfer the funds to other funds or to the Fidelity Retirement Money Market
Fund.  The trustee  liquidated the accounts of employees who did not comply with
the request,  and  transferred  the proceeds to the  Fidelity  Retirement  Money
Market Fund. This fund is not ordinarily an available option for  contributions;
it was used only to facilitate  the  liquidation of the Brokerage Link accounts.
At December 31, 1999, the fund held $2,045,747.

                                       4
<PAGE>

       Contributions:

       Participants may make before-tax  contribution by payroll deduction up to
the legal dollar limit.  Participants  may also make after-tax  contributions in
cash or by payroll deduction.  Total contributions are limited to the applicable
percentage  limit set by law. A participant may also  "roll-over"  into the Plan
amounts previously invested in another retirement plan.

       Participants have the option of investing their contributions into any or
all of the  investment  funds in the  proportions  they choose.  They may change
their  investment  options or  transfer  amounts  from fund to fund at any time.
Amounts are transferred to or from the Illinois Power Company  Incentive Savings
Plan as  participants'  shift out of or into  positions  covered by a collective
bargaining  agreement.  These transfers are shown in the Statement of Changes in
Net  Assets  Available  for  Benefits  with  Fund  Information  as  Plan-to-Plan
Transfers.


The Company contributes a monthly matching contribution to the Plan equal to 50%
of  the  participants'  monthly  before-tax  contributions,  up  to  6%  of  the
employee's base earnings for the month. All Company matching  contributions  are
paid in units of  Illinova  common  stock and are  contained  in the Stock Fund.
Dividends on stock held in the Stock Fund are also invested in the Stock Fund.

       The  Company  has an  Incentive  Compensation  arrangement  in which  all
participants  employed  by the  company  on the last  day of the  Plan  year are
eligible to earn Illinova  stock if specified  performance  goals are met. Units
awarded under the Incentive Compensation arrangement are held in the Stock Fund.
Dividends earned on these units are also invested in the Stock Fund.

       Shares  previously  held in the Tax  Reduction Act Stock  Ownership  Plan
(TRASOP), which was eliminated in 1988, are also held in the Stock Fund.

       ESOP:

       In October  1990,  the Board of Directors  authorized  amendments  to the
Incentive  Savings Plan to provide for the  implementation  of an Employee Stock
Ownership Plan (ESOP) arrangement. Under this arrangement, the Company, pursuant
to authorization  granted by the Illinois Commerce  Commission (ICC), loaned $35
million to the Trustee of the ESOP in January 1991.  The loan proceeds were used
to purchase  2,031,445  shares of the Company's common stock on the open market.
These  shares  are held in a  suspense  account  under  the  Plans and are being
distributed to the accounts of participating  employees as the loan is repaid by
the Trustee with funds contributed by Illinois Power, together with dividends on
the shares  acquired  with the loan  proceeds.  The shares are  allocated to the
accounts  of eligible  participating  employees  as they are earned  through the
Match or Incentive Compensation features of the Plan.

       As of December 31, 1999,  450,189 and 339,205  shares have been allocated
to  salaried   employees  for  Matching   Contribution  and  Company   Incentive
Contributions.

                                       5
<PAGE>

       Distributions:

       Distributions  as  provided  for in the  Plan are  made to  retired  Plan
participants or their  beneficiaries.  Distributions  must begin by April 1st of
the calendar year following the later of the calendar year in which the employee
reaches  age 70 1/2 or the  calendar  year in which the  employee  retires.  All
distributions are made in the form of cash and/or Illinova common stock.

       Forfeitures:

       Each  participant is responsible for supplying the Company with a current
address. If the address of the participant (or the participant's  beneficiary in
the event of participant's  death) is not known to the Company within four years
(three  years  in the  event  of  participant's  death)  of the  date  on  which
distribution  may  first be made,  the  adjusted  balance  in the  participant's
account  shall be  deemed a  forfeiture  and  shall be used to  reduce  matching
contributions  and  company  incentive  contributions.  In the  event  that  the
participant or  beneficiary  makes a valid claim for the forfeited  amount,  the
benefits shall be reinstated.

       Loans:

       The Plan allows  participants to borrow from their  before-tax and TRASOP
accounts an amount not to exceed the lesser of $50,000  reduced by the excess of
the highest  outstanding  balance of loans during the one-year period before the
date the loan is made over the outstanding balance of loans on the date the loan
is made or 50% of the vested account balance. Interest is charged on these loans
at a rate commensurate with interest rates charged by persons in the business of
lending  money for similar type loans.  For 1999,  the interest rate ranged from
8.75% to 9.50%; for 1998 the rate ranged from 8.75% to 9.50%.

       All loans made will  mature  and be  payable in full no earlier  than one
year and no later than five years from the date of the loan. An exception exists
when  the  loan is used  by the  participant  to  acquire  his or her  principal
residence.  In this case, the loan will mature and be payable in full no earlier
than one  year and no later  than  ten  years  from the date of the  loan.  Loan
repayments are made by payroll  deductions  authorized by the participant and by
optional  cash  payments.   Interest  paid  on  the  loan  is  credited  to  the
participant's account. The Trustee maintains a Loan Fund to hold the balances of
participants' loans.

       Plan Termination:

       The  right to amend,  modify or  terminate  the Plan is  reserved  by the
Company  provided that such action does not  retroactively  and adversely affect
the  rights of any  participant  or  beneficiary  under  the  Plan.  See Note 6,
Subsequent Event.


                                       6
<PAGE>


NOTE 2 - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES:

       Basis of Accounting:

       The  accompanying  Plan financial  statements are prepared on the accrual
basis of accounting.

       Investments:

       Participant  notes  receivable  included  in the loan fund are  valued at
cost, which  approximates  fair value.  Other  investments are stated at current
value based on the latest quoted market price.

       Investment  securities  are  exposed to various  risks,  such as interest
rate,  market,  and credit.  Due to the level of risk  associated  with  certain
investment  securities  and the level of  uncertainty  related to changes in the
value of investment securities,  it is at least reasonably possible that changes
in risks in the near term could  materially  affect the amounts  reported in the
Statement of Net Assets Available for Benefits.

       Income:

       Interest and dividend income is accrued as earned.

       Net appreciation  (depreciation)  of investments is comprised of realized
and  unrealized  gains  and  losses.  Realized  gains or  losses  represent  the
difference  between  proceeds  received  upon sale and the  average  cost of the
investment.  Unrealized gain or loss is the difference  between market value and
cost of investments  retained in the Plan (at financial statement date). For the
purpose of allocation to  participants,  the Illinova  common stock is valued by
the Plan at market value on the date of allocation  and current value is used at
the time of distribution  to  participants  resulting in a realized gain or loss
and is reflected in the Net  Appreciation  in Fair Value of  Investments  in the
Statement of Changes in Net Assets Available for Benefits.

       Expenses:

       Certain expenses  incurred in the  administration of the Plan are paid by
the Plan rather than the  Company.  The  expenses  paid by the Plan include ESOP
record keeping fees and trustee administrative fees. All other expenses incurred
in the operation of the Plan are paid by the Company.

       Income Taxes:

       The Internal Revenue Service has determined and informed the Company by a
letter dated  January 8, 1996,  that the Plan and related  trust are designed in
accordance with applicable  sections of the IRC. The plan has been amended since
receiving the  determination  letter.  However,  the Plan  Administrator and the
Plan's tax counsel  believe  that the Plan is designed  and is  currently  being
operated in compliance with the applicable requirements of the IRC.

                                       7
<PAGE>

       Use of Estimates:

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



                                       8
<PAGE>

       NOTE 3 - INVESTMENTS

       Plan  investments  are  received,  invested  and  held  by  the  Trustee.
Individual  investments  that  represent  5% or more of the  Plan's  net  assets
available for benefits include:
<TABLE>
                <S>                                      <C>                  <C>                    <C>

                                                                        December 31, 1999

Investments at Fair Value as Determined by
Quoted Market Price
                                                        Units                 Value                  Cost

Illinova Common Stock                                  1,045,661           $36,336,720           $42,754,371

Fidelity Equity Income Fund                              752,345           $40,325,424           $30,609,469

Fidelity Retirement Growth Fund                        2,670,136           $69,023,023           $51,282,734

Fidelity Managed Income Portfolio Fund                21,765,711           $21,765,711           $21,765,711

Fidelity U. S. Equity Index Pool Fund                    287,472            12,091,053           $ 9,341,730

</TABLE>


<TABLE>
                    <S>                                    <C>                 <C>                    <C>

                                                                         December 31, 1998

Investments at Fair Value as Determined by
Quoted Market Price
                                                         Units                Value                  Cost

Illinova Common Stock                                 1,021,868            25,546,700           $21,420,783

Fidelity Equity Income Fund                             782,044            43,442,523           $29,612,286

Fidelity Retirement Growth Fund
                                                      2,175,660           $44,622,782           $39,077,299

Fidelity Asset Manager Fund
                                                        621,938           $10,815,508           $10,111,240

Fidelity Managed Income Portfolio Fund               17,502,633           $17,502,633           $17,502,633
</TABLE>



                                       9
<PAGE>

NOTE 4 - TRANSACTIONS WITH PARTIES-IN-INTEREST

     Fidelity  Management  Trust  Company,  the Trustee for the Plan,  purchased
shares of Illinova Common Stock at a cost of $5,250,541 in 353  transactions and
sold shares, the proceeds of which totaled $6,239,272, in 327 transactions.  The
net  gain  on  these  sales  was  $1,496,345.  The  transactions  are  allowable
party-in-interest transactions under Section 408(3) of ERISA and the regulations
thereunder.

     The majority of the assets of the Plan are invested in Fidelity Investments
mutual  funds.  The Plan also  invests in a short-term  money  market fund,  the
Fidelity Investments Cash Portfolio.  The transactions with these Fidelity funds
are allowable  party-in-interest  transactions  under Section 408(b)(8) of ERISA
and the regulations  thereunder.  The number of purchase  transactions with each
fund and the dollar  amount of  purchases  for each fund as of December 31, 1999
are listed below:

                                               Purchase               Purchase
Fund                                          Transactions             Amount

Fidelity Equity Income Fund                       228                $ 8,977,416

Fidelity Retirement Growth Fund                   232                $18,509,775

Fidelity Asset Manager Income Fund                142                $ 1,271,920

Fidelity Asset Manager Growth Fund                160                $ 1,980,671

Fidelity Asset Manager Fund                       164                $ 2,489,364

Fidelity International Growth and Income Fund     141                $ 1,799,651

Fidelity Managed Income Portfolio Fund            208                $12,505,161

Fidelity US Equity Index Commingled Pool          181                $ 5,423,822

Founders Growth Fund                              164                $ 4,112,221

USAA International Fund                           124                $ 1,500,979

Warburg Pincus Emerging Growth                    123                $ 2,539,090

Fidelity Brokerage Link                           115                $ 6,653,111

Fidelity Retirement Money Market                   37                $ 3,835,239

Cash Portfolio                                    163                $ 5,154,566


                                       10
<PAGE>

     The  number of sales  transactions  with each fund,  the  dollar  amount of
sales,  and the gain on these  sales for each fund as of  December  31, 1999 are
shown below:
<TABLE>
               <S>                                      <C>                <C>               <C>

                                                       Sales
                                                       Trans-             Sales
Fund                                                   actions           Amount             Gain

Fidelity Equity Income Fund                             202           $10,715,345        $2,735,112

Fidelity Retirement Growth Fund                         196           $ 7,300,445          $966,106

Fidelity Asset Manager Income Fund                       79           $ 1,235,912           $(2,889)

Fidelity Asset Manager Growth Fund                      106           $ 1,902,670          $273,877

Fidelity Asset Manager Fund                             118           $ 2,353,604          $168,316

Fidelity International Growth and Income Fund            91             $ 765,415          $107,441

Fidelity Managed Income Portfolio Fund                  180           $ 8,242,083             $   0

Fidelity US Equity Index Commingled Pool                103           $ 2,629,318          $488,202

Founders Growth Fund                                     84           $ 1,416,736          $109,684

USAA International Fund                                  55           $ 1,090,100          $ 22,413

Warburg Pincus Emerging Growth                           54             $ 426,583          $ 18,744

Fidelity Brokerage Link                                 252           $ 4,443,273              $  0

Fidelity Retirement Money Market                         19           $ 1,789,507              $  0

Cash Portfolio                                          243           $ 5,110,084              $  0

</TABLE>

                                       11
<PAGE>


NOTE 5 - NONPARTICIPANT-DIRECTED INVESTMENTS

           All funds in the plan are participant directed, with the exception of
the Illinova Stock Fund, which is partially  nonparticipant directed as pertains
to  the  Company  match  and  incentive   compensation  features  of  the  plan.
Information  about the net assets and the significant  components of the changes
in net assets relating to the Illinova Stock Fund is as follows:

<TABLE>
             <S>                                        <C>                            <C>

                                                                   December 31,
                                                        1999                          1998

ASSETS:

 Cash and Temporary Cash Investments                 $ 339,276                     $ 350,597
 Investments at Fair Value                          36,336,720                    25,546,700
                                                   -----------                    -----------
          Total Investments                         36,675,996                    25,897,297

 Dividends and Interest Receivable                       1,596                         1,413
 Employee Contributions Receivable                       4,966                        93,940
 Employer Contributions Receivable                   3,343,289                       199,698
 Loan Repayments Receivable                                  0                           879
                                                   -----------                    -----------
                             Other Assets            3,349,851                       295,930
                                                   -----------                    -----------
          Total Assets                              40,025,847                    26,193,227
                                                   -----------                    -----------

LIABILITIES:
 Accrued Expenses                                            0                        57,906
 Assets to be transferred to AmerGen                10,244,086                             0
                                                   -----------                   -----------
          Total Liabilities                         10,244,086                        57,906
                                                   -----------                   -----------

NET ASSETS AVAILABLE FOR BENEFITS                  $29,781,761                   $26,135,321
                                                   ===========                   ===========

</TABLE>


                                       12
<PAGE>



<TABLE>
               <S>                                              <C>                         <C>





                                                                          December 31,
                                                               1999                        1998

Sources of Participants' Equity:
   Contributions:
         Employee                                           $ 149,468                    $ 96,592
         Employer                                           5,841,996                   1,599,690
                                                           -----------                -----------
                                                            5,991,464                   1,696,282
                                                           -----------                -----------

 Plan-to-Plan Transfers                                       197,561                     182,169

   Investment Income:
       Dividend and Interest Income                         1,332,489                   1,224,013
       Net Change in Fair Value of
         Investments                                       10,479,096                  (1,770,615)
                                                          -----------                  -----------
                                                           11,811,585                    (546,602)
                                                          -----------                  -----------
Application of Participants' Equity:
       Distributions to Active and
         Terminated Participants                            1,385,479                   1,526,481
       Administrative and Miscellaneous
         Expenses                                              24,263                      27,086
                                                          -----------                 -----------
                                                            1,409,742                   1,553,567
                                                          -----------                 -----------
Increase (Decrease) in Net Assets
   Available for Benefits prior to
  interfund transfers                                      16,590,868                    (221,718)

Loans to Participants, net                                        694                       3,439

Fund-to-Fund Transfers                                     (2,701,036)                   (715,794)

Assets to be Transferred to AmerGen                       (10,244,086)                          0

Net Assets Available for Benefits,
   Beginning of Year                                       26,135,321                  27,069,394
                                                          -----------                 -----------
Net Assets Available for Benefits,
   End of Year                                            $29,781,761                 $26,135,321
                                                          ===========                 ===========

</TABLE>

                                       13
<PAGE>





NOTE 6 - SUBSEQUENT EVENT

     On February 1, 2000, Illinova merged with Dynegy,Inc. which has its own 401
(k) Plan.  No changes have yet been made to the Illinois  Power Plan as a result
of the merger.



                                       14
<PAGE>


                                                                     Schedule 1

                             Illinois Power Company
                             Incentive Savings Plan

                 Schedule of Assets Held for Investment Purposes
                                December 31, 1999
<TABLE>
              <S>                                                   <C>                   <C>

Identity of Issue/                                                                        Current
Description of Investment                                          Cost                    Value

*Illinova Common Stock                                         $42,754,371             $36,336,720

*Fidelity Equity Income Fund                                    30,609,469              40,235,424

*Fidelity Retirement Growth Fund                                51,282,734              69,023,023

*Fidelity Asset Manager Income Fund                              1,888,012               1,928,344

*Fidelity Asset Manager Growth Fund                              7,379,946               8,569,188

*Fidelity Asset Manager Fund                                    10,415,316              11,594,767

*Fidelity International Growth and Income Fund                   4,166,873               6,045,033

*Fidelity Managed Income Portfolio Fund                         21,765,711              21,765,711

*Fidelity US Equity Index Commingled Pool                        9,341,730              12,091,053

*Founders Growth Fund                                            6,879,010               8,002,463

*USAA International Fund                                         1,176,342               1,295,128

*Warburg Pincus Emerging Growth                                  3,494,506               4,098,745

*Fidelity Brokerage Link                                         3,742,402               3,742,402

*Fidelity Retirement Money Market Fund                           2,045,747               2,045,747

*Participant Loans**                                             4,133,430               4,133,430
                                                                 ---------               ---------

                                                              $201,075,599            $230,907,178
                                                              ============            ============
</TABLE>

*A party-in-interest to the Plan
**Interest rates on loans range
from 7% to 11%


                                       15
<PAGE>




     SIGNATURE


        Pursuant to the  requirements  of the  Securities  Exchange Act of 1934,
        Illinois  Power  Company has duly caused this annual report to be signed
        on its behalf by the undersigned hereunto duly authorized.


                                                 Illinois Power Company
                                                 Incentive Savings Plan



                                                 By _______________________
                                                     R. Mark Relken
                                                     Director-Benefits, Compen-
                                                     sation, Recruiting, System
                                                     and Payroll

        Date: June 28, 2000


                                       16
<PAGE>

                                  EXHIBIT INDEX

                             Exhibits Filed Herewith



            Exhibit No.                    Description
--------------------------------------------------------------------------------
                 1                         Consent of Independent Accountants



                                       17
<PAGE>

                       CONSENT OF INDEPENDENT ACCOUNTANTS



We  hereby  consent  to the  incorporation  by  reference  in  the  Registration
Statement on Form S-8 (No. 33-60278 of Illinova  Corporation of our report dated
June 23, 2000 relating to the financial statements of the Illinois Power Company
Incentive Savings Plan, which appears in this Form 11-K.





PricewaterhouseCoopers LLP

St. Louis, Missouri
June 28, 2000


                                       18
<PAGE>



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