ILLINOIS POWER CO
11-K, 1999-06-29
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, 1998

                          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, 1998



<PAGE>


                             ILLINOIS POWER COMPANY
                             INCENTIVE SAVINGS PLAN


     Index to Financial Statements and Additional Information

Financial Statements:                                                  Page

      Report of Independent Accountants

      Statements of Net Assets Available for Benefits                 2-17
      with Fund Information as of
      December 31, 1998 and 1997


      Statements  of Changes  in Net Assets  Available               18-33
      for Benefits with Fund Information for the
      years ended December 31, 1998 and 1997


      Notes to Financial Statements                                  34-42

Additional Information:

       Schedule I - Schedule of Assets Held for Investment Purposes

       Schedule II - Schedule of Reportable Transactions



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>

ILLINOIS POWER COMPANY
INCENTIVE SAVINGS PLAN


Statement of Net Assets Available for Benefits
with Fund Information as of December 31, 1998

                                                                 Fidelity
                                              Illinova            Equity
                                               Stock              Income
                                               Fund                Fund
ASSETS:
   Cash and Temporary Cash Investments      $   350,597         $         0
   Investments at Fair Value                 25,546,700          43,442,523
                                            -----------         -----------
       Total Investments                     25,897,297          43,442,523

   Dividends and Interest Receivable              1,413                   0
   Employee Contributions Receivable             93,940              73,717
   Employer Contributions Receivable            199,698                   0
   Loan Repayments Receivable                       879              15,231
   Loans Outstanding                                  0                   0
                                            -----------         -----------
       Other Assets                             295,930              88,948
                                            -----------         -----------
   Total Assets                              26,193,227          43,531,471
                                            -----------         -----------

LIABILITIES:
   Accrued Expenses                              57,906                   0
                                            -----------         -----------
   Total Liabilities                             57,906                   0
                                            -----------         -----------
NET ASSETS AVAILABLE FOR BENEFITS           $26,135,321         $43,531,471
                                            ===========         ===========

     See Accompanying Notes to Financial Statements

                                       2
<PAGE>

ILLINOIS POWER COMPANY
INCENTIVE SAVINGS PLAN



Statement of Net Assets Available for Benefits
with Fund Information as of December 31, 1998

                                             Fidelity
                                            Retirement
                                              Growth               Loan
                                               Fund                Fund

ASSETS:
   Cash and Temporary Cash Investments      $         0         $        0
   Investments at Fair Value                 44,622,782                  0
                                            -----------         ----------
       Total Investments                     44,622,782                  0

   Dividends and Interest Receivable                  0                  0
   Employee Contributions Receivable             77,123                  0
   Employer Contributions Receivable                  0                  0
   Loan Repayments Receivable                    16,685            (57,757)
   Loans Outstanding                                  0          4,190,017
                                            -----------         ----------
       Other Assets                              93,809          4,132,260
                                            -----------         ----------
   Total Assets                              44,716,590          4,132,260
                                            -----------         ----------

LIABILITIES:
   Accrued Expenses                                   0                  0
                                            -----------         ----------
   Total Liabilities                                  0                  0
                                            -----------         ----------
NET ASSETS AVAILABLE FOR BENEFITS           $44,716,590         $4,132,260
                                            ===========         ==========

     See Accompanying Notes to Financial Statements

                                       3
<PAGE>

ILLINOIS POWER COMPANY
INCENTIVE SAVINGS PLAN



Statement of Net Assets Available for Benefits
with Fund Information as of December 31, 1998

                                             Fidelity             Fidelity
                                              Asset                 Asset
                                             Manager               Manager
                                              Income               Growth
                                               Fund                 Fund
ASSETS:
   Cash and Temporary Cash Investments      $        0          $        0
   Investments at Fair Value                 1,918,843           8,025,684
                                            ----------          ----------
       Total Investments                     1,918,843           8,025,684

   Dividends and Interest Receivable                 0                   0
   Employee Contributions Receivable             5,524              19,439
   Employer Contributions Receivable                 0                   0
   Loan Repayments Receivable                      452               3,104
   Loans Outstanding                                 0                   0
                                            ----------          ----------
       Other Assets                              5,976              22,543
                                            ----------          ----------
   Total Assets                              1,924,819           8,048,227
                                            ----------          ----------

LIABILITIES:
   Accrued Expenses                                  0                   0
                                            ----------          ----------
   Total Liabilities                                 0                   0
                                            ----------          ----------
NET ASSETS AVAILABLE FOR BENEFITS           $1,924,819          $8,048,227
                                            ==========          ==========

     See Accompanying Notes to Financial Statements

                                       4
<PAGE>

ILLINOIS POWER COMPANY
INCENTIVE SAVINGS PLAN



Statement of Net Assets Available for Benefits
with Fund Information as of December 31, 1998


                                              Fidelity            Fidelity
                                                Asset           International
                                               Manager           Growth and
                                                Fund            Income Fund
ASSETS:
   Cash and Temporary Cash Investments      $         0         $        0
   Investments at Fair Value                 10,815,508          3,370,968
                                             ----------         ----------
       Total Investments                     10,815,508          3,370,968

   Dividends and Interest Receivable                  0                  0
   Employee Contributions Receivable             21,171              9,263
   Employer Contributions Receivable                  0                  0
   Loan Repayments Receivable                     3,784              1,729
   Loans Outstanding                                  0                  0
                                             ----------         ----------
       Other Assets                              24,955             10,992
                                             ----------         ----------
   Total Assets                              10,840,463          3,381,960
                                             ----------         ----------

LIABILITIES:
   Accrued Expenses                                   0                  0
                                             ----------         ----------
   Total Liabilities                                  0                  0
                                             ----------         ----------
NET ASSETS AVAILABLE FOR BENEFITS           $10,840,463         $3,381,960
                                             ==========         ==========


     See Accompanying Notes to Financial Statements

                                       5
<PAGE>

ILLINOIS POWER COMPANY
INCENTIVE SAVINGS PLAN



Statement of Net Assets Available for Benefits
with Fund Information as of December 31, 1998

                                              Fidelity            Fidelity
                                               Managed           US Equity
                                                Income             Index
                                              Portfolio          Commingled
                                                 Fund               Pool

ASSETS:
   Cash and Temporary Cash Investments      $         0         $        0
   Investments at Fair Value                 17,502,633          7,493,956
                                            -----------         ----------
       Total Investments                     17,502,633          7,493,956

   Dividends and Interest Receivable                  0                  0
   Employee Contributions Receivable             25,854             23,772
   Employer Contributions Receivable                  0                  0
   Loan Repayments Receivable                     7,087              3,492
   Loans Outstanding                                  0                  0
                                            -----------         ----------
       Other Assets                              32,941             27,264
                                            -----------         ----------
   Total Assets                              17,535,574          7,521,220
                                            -----------         ----------

LIABILITIES:
   Accrued Expenses                                   0                  0
                                            -----------         ----------
   Total Liabilities                                  0                  0
                                            -----------         ----------
NET ASSETS AVAILABLE FOR BENEFITS           $17,535,574         $7,521,220
                                            ===========         ==========


     See Accompanying Notes to Financial Statements

                                       6
<PAGE>

ILLINOIS POWER COMPANY
INCENTIVE SAVINGS PLAN



Statement of Net Assets Available for Benefits
with Fund Information as of December 31, 1998

                                             Founders             USAA
                                               Growth         International
                                                Fund              Fund
ASSETS:
   Cash and Temporary Cash Investments      $        0          $      0
   Investments at Fair Value                 4,372,705           696,540
                                            ----------          --------
       Total Investments                     4,372,705           696,540

   Dividends and Interest Receivable                 0                 0
   Employee Contributions Receivable            13,888             3,056
   Employer Contributions Receivable                 0                 0
   Loan Repayments Receivable                    2,093               432
   Loans Outstanding                                 0                 0
                                            ----------          --------
       Other Assets                             15,981             3,488
                                            ----------          --------
   Total Assets                              4,388,686           700,028
                                            ----------          --------

LIABILITIES:
   Accrued Expenses                                  0                 0
                                            ----------          --------
   Total Liabilities                                 0                 0
                                            ----------          --------
NET ASSETS AVAILABLE FOR BENEFITS           $4,388,686          $700,028
                                            ==========          ========


     See Accompanying Notes to Financial Statements

                                       7
<PAGE>

ILLINOIS POWER COMPANY
INCENTIVE SAVINGS PLAN



Statement of Net Assets Available for Benefits
with Fund Information as of December 31, 1998

                                              Warburg
                                               Pincus             Fidelity
                                              Emerging           Brokerage
                                               Growth                Link
ASSETS:
   Cash and Temporary Cash Investments      $        0          $        0
   Investments at Fair Value                 1,421,588           3,992,883
                                              --------          ----------
       Total Investments                     1,421,588           3,992,883

   Dividends and Interest Receivable                 0                   0
   Employee Contributions Receivable             5,474               2,471
   Employer Contributions Receivable                 0                   0
   Loan Repayments Receivable                      921               1,868
   Loans Outstanding                                 0                   0
                                              --------          ----------
       Other Assets                              6,395               4,339
                                              --------          ----------
   Total Assets                              1,427,983           3,997,222
                                              --------          ----------

LIABILITIES:
   Accrued Expenses                                  0                   0
                                              --------          ----------
   Total Liabilities                                 0                   0
                                              --------          ----------
NET ASSETS AVAILABLE FOR BENEFITS           $1,427,983          $3,997,222
                                            ==========          ==========


     See Accompanying Notes to Financial Statements

                                       8
<PAGE>

ILLINOIS POWER COMPANY
INCENTIVE SAVINGS PLAN


Statement of Net Assets Available for Benefits
with Fund Information as of December 31, 1998

                                                       Total All
                                                         Funds
ASSETS:
   Cash and Temporary Cash Investments                  $ 350,597
   Investments at Fair Value                          173,223,313
                                                     ------------
       Total Investments                              173,573,910

   Dividends and Interest Receivable                        1,413
   Employee Contributions Receivable                      374,692
   Employer Contributions Receivable                      199,698
   Loan Repayments Receivable                                   0
   Loans Outstanding                                    4,190,017
                                                     ------------
       Other Assets                                     4,765,820
                                                     ------------
   Total Assets                                       178,339,730
                                                     ------------

LIABILITIES:
   Accrued Expenses                                        57,906
                                                     ------------
   Total Liabilities                                       57,906
                                                     ------------
NET ASSETS AVAILABLE FOR BENEFITS                    $178,281,824
                                                     ============


     See Accompanying Notes to Financial Statements

                                       9
<PAGE>

ILLINOIS POWER COMPANY
INCENTIVE SAVINGS PLAN


Statement of Net Assets Available for Benefits
with Fund Information as of December 31, 1997

                                                                 Fidelity
                                              Illinova            Equity
                                               Stock              Income
                                               Fund                Fund
ASSETS:
   Cash and Temporary Cash Investments      $   298,849         $         0
   Investments at Fair Value                 25,968,828          41,911,711
                                            -----------         -----------
       Total Investments                     26,267,677          41,911,711

   Dividends and Interest Receivable              1,278                   0
   Employee Contributions Receivable              2,051              67,595
   Employer Contributions Receivable            811,796                   0
   Loan Repayments Receivable                       591              15,454
   Loans Outstanding                                  0                   0
                                            -----------         -----------
       Other Assets                             815,716              83,049
                                            -----------         -----------
   Total Assets                              27,083,393          41,994,760
                                            -----------         -----------

LIABILITIES:
   Accrued Expenses                              13,999                   0
                                            -----------         -----------
   Total Liabilities                             13,999                   0
                                            -----------         -----------
NET ASSETS AVAILABLE FOR BENEFITS           $27,069,394         $41,994,760
                                            ===========         ===========


     See Accompanying Notes to Financial Statements

                                       10
<PAGE>

ILLINOIS POWER COMPANY
INCENTIVE SAVINGS PLAN



Statement of Net Assets Available for Benefits
with Fund Information as of December 31, 1997

                                             Fidelity
                                            Retirement
                                              Growth               Loan
                                                Fund               Fund

ASSETS:
   Cash and Temporary Cash Investments      $         0         $        0
   Investments at Fair Value                 33,106,384                  0
                                            -----------         ----------
       Total Investments                     33,106,384                  0

   Dividends and Interest Receivable                  0                  0
   Employee Contributions Receivable             61,714                  0
   Employer Contributions Receivable                  0                  0
   Loan Repayments Receivable                    13,682           (50,704)
   Loans Outstanding                                  0          3,916,574
                                            -----------         ----------
       Other Assets                              75,396          3,865,870
                                            -----------         ----------
   Total Assets                              33,181,780          3,865,870
                                            -----------         ----------

LIABILITIES:
   Accrued Expenses                                   0                  0
                                            -----------         ----------
   Total Liabilities                                  0                  0
                                            -----------         ----------
NET ASSETS AVAILABLE FOR BENEFITS           $33,181,780         $3,865,870
                                            ===========         ==========


     See Accompanying Notes to Financial Statements

                                       11
<PAGE>

ILLINOIS POWER COMPANY
INCENTIVE SAVINGS PLAN



Statement of Net Assets Available for Benefits
with Fund Information as of December 31, 1997

                                             Fidelity             Fidelity
                                               Asset                Asset
                                             Manager              Manager
                                              Income               Growth
                                               Fund                 Fund
ASSETS:
   Cash and Temporary Cash Investments      $        0          $        0
   Investments at Fair Value                 1,181,289           7,373,529
                                            ----------          ----------
       Total Investments                     1,181,289           7,373,529

   Dividends and Interest Receivable                 0                   0
   Employee Contributions Receivable             3,244              16,817
   Employer Contributions Receivable                 0                   0
   Loan Repayments Receivable                      535               2,828
   Loans Outstanding                                 0                   0
                                            ----------          ----------
       Other Assets                              3,779              19,645
                                            ----------          ----------
   Total Assets                              1,185,068           7,393,174
                                            ----------          ----------

LIABILITIES:
   Accrued Expenses                                  0                   0
                                            ----------          ----------
   Total Liabilities                                 0                   0
                                            ----------          ----------
NET ASSETS AVAILABLE FOR BENEFITS           $1,185,068          $7,393,174
                                            ==========          ==========


     See Accompanying Notes to Financial Statements

                                       12
<PAGE>

ILLINOIS POWER COMPANY
INCENTIVE SAVINGS PLAN



Statement of Net Assets Available for Benefits
with Fund Information as of December 31, 1997

                                             Fidelity             Fidelity
                                              Asset             International
                                             Manager              Growth and
                                              Fund               Income Fund
ASSETS:
   Cash and Temporary Cash Investments      $        0          $        0
   Investments at Fair Value                 9,362,941           3,347,530
                                            ----------          ----------
       Total Investments                     9,362,941           3,347,530

   Dividends and Interest Receivable                 0                   0
   Employee Contributions Receivable            17,467               9,260
   Employer Contributions Receivable                 0                   0
   Loan Repayments Receivable                    3,827               1,897
   Loans Outstanding                                 0                   0
                                            ----------          ----------
       Other Assets                             21,294              11,157
                                            ----------          ----------
   Total Assets                              9,384,235           3,358,687
                                            ----------          ----------

LIABILITIES:
   Accrued Expenses                                  0                   0
                                            ----------          ----------
   Total Liabilities                                 0                   0
                                            ----------          ----------
NET ASSETS AVAILABLE FOR BENEFITS           $9,384,235          $3,358,687
                                            ==========          ==========


     See Accompanying Notes to Financial Statements

                                       13
<PAGE>

ILLINOIS POWER COMPANY
INCENTIVE SAVINGS PLAN



Statement of Net Assets Available for Benefits
with Fund Information as of December 31, 1997

                                              Fidelity            Fidelity
                                               Managed           US Equity
                                                Income             Index
                                              Portfolio          Commingled
                                                 Fund               Pool

ASSETS:
   Cash and Temporary Cash Investments      $         0         $        0
   Investments at Fair Value                 15,046,006          2,855,122
                                            -----------         ----------
       Total Investments                     15,046,006          2,855,122

   Dividends and Interest Receivable                  0                  0
   Employee Contributions Receivable             20,818             10,869
   Employer Contributions Receivable                  0                  0
   Loan Repayments Receivable                     6,516              1,975
   Loans Outstanding                                  0                  0
                                            -----------         ----------
       Other Assets                              27,334             12,844
                                            -----------         ----------
   Total Assets                              15,073,340          2,867,966
                                            -----------         ----------

LIABILITIES:
   Accrued Expenses                                   0                  0
                                            -----------         ----------
   Total Liabilities                                  0                  0
                                            -----------         ----------
NET ASSETS AVAILABLE FOR BENEFITS           $15,073,340         $2,867,966
                                            ===========         ==========


     See Accompanying Notes to Financial Statements

                                       14
<PAGE>

ILLINOIS POWER COMPANY
INCENTIVE SAVINGS PLAN



Statement of Net Assets Available for Benefits
with Fund Information as of December 31, 1997

                                             Founders              USAA
                                              Growth            International
                                               Fund                Fund
ASSETS:
   Cash and Temporary Cash Investments      $        0          $      0
   Investments at Fair Value                 1,687,490           683,595
                                            ----------          --------
       Total Investments                     1,687,490           683,595

   Dividends and Interest Receivable                 0                 0
   Employee Contributions Receivable             6,023             2,407
   Employer Contributions Receivable                 0                 0
   Loan Repayments Receivable                    1,171               342
   Loans Outstanding                                 0                 0
                                            ----------          --------
       Other Assets                              7,194             2,749
                                            ----------          --------
   Total Assets                              1,694,684           686,344
                                            ----------          --------

LIABILITIES:
   Accrued Expenses                                  0                 0
                                            ----------          --------
   Total Liabilities                                 0                 0
                                            ----------          --------
NET ASSETS AVAILABLE FOR BENEFITS           $1,694,684          $686,344
                                            ==========          ========


     See Accompanying Notes to Financial Statements

                                       15
<PAGE>

ILLINOIS POWER COMPANY
INCENTIVE SAVINGS PLAN



Statement of Net Assets Available for Benefits
with Fund Information as of December 31, 1997

                                             Warburg
                                              Pincus              Fidelity
                                             Emerging            Brokerage
                                              Growth                Link
ASSETS:
   Cash and Temporary Cash Investments      $      0            $        0
   Investments at Fair Value                 961,687             1,621,382
                                            --------            ----------
       Total Investments                     961,687             1,621,382

   Dividends and Interest Receivable               0                     0
   Employee Contributions Receivable           3,639                 1,469
   Employer Contributions Receivable               0                     0
   Loan Repayments Receivable                    757                 1,129
   Loans Outstanding                               0                     0
                                            --------            ----------
       Other Assets                            4,396                 2,598
                                            --------            ----------
   Total Assets                              966,083             1,623,980
                                            --------            ----------

LIABILITIES:
   Accrued Expenses                                0                     0
                                            --------            ----------
   Total Liabilities                               0                     0
                                            --------            ----------
NET ASSETS AVAILABLE FOR BENEFITS           $966,083            $1,623,980
                                            ========            ==========


     See Accompanying Notes to Financial Statements

                                       16
<PAGE>

ILLINOIS POWER COMPANY
INCENTIVE SAVINGS PLAN


Statement of Net Assets Available for Benefits
with Fund Information as of December 31, 1997

                                                        Total All
                                                          Funds
ASSETS:
   Cash and Temporary Cash Investments                  $ 298,849
   Investments at Fair Value                          145,107,494
                                                     ------------
       Total Investments                              145,406,343

   Dividends and Interest Receivable                        1,278
   Employee Contributions Receivable                      223,373
   Employer Contributions Receivable                      811,796
   Loan Repayments Receivable                                   0
   Loans Outstanding                                    3,916,574
                                                     ------------
       Other Assets                                     4,953,021
                                                     ------------
   Total Assets                                       150,359,364
                                                     ------------

LIABILITIES:
   Accrued Expenses                                        13,999
                                                     ------------
   Total Liabilities                                       13,999
                                                     ------------
NET ASSETS AVAILABLE FOR BENEFITS                    $150,345,365
                                                     ============


     See Accompanying Notes to Financial Statements

                                       17
<PAGE>

ILLINOIS POWER COMPANY
INCENTIVE SAVINGS PLAN

Statement of Changes in Net Assets Available for Benefits
with Fund Information for the Year Ended December 31, 1998

                                             Illinova               Fidelity
                                               Stock             Equity Income
                                               Fund                   Fund
Sources of Participants' Equity:
   Contributions:
         Employee                              $ 96,592         $ 2,416,005
         Employer                             1,599,690                   0
                                            -----------         -----------
                                              1,696,282           2,416,005
                                            -----------         -----------

 Plan-to-Plan Transfers                         182,169             385,644

   Investment Income:
       Dividend and Interest Income           1,224,013           2,620,545
       Net Change in Fair Value of
         Investments                         (1,770,615)          2,698,795
                                            -----------         -----------
                                               (546,602)          5,319,340
                                            -----------         -----------
Application of Participants' Equity:
       Distributions to Active and
         Terminated Participants              1,526,481           2,075,436
       Administrative and Miscellaneous
         Expenses                                27,086               8,313
                                            -----------         -----------
                                              1,553,567           2,083,749
                                            -----------         -----------
Increase (Decrease) in Net Assets
   Available for Benefits prior to
  interfund transfers                          (221,718)          6,037,240

Loans to Participants, net                        3,349             (83,626)

Fund-to-Fund Transfers                         (715,794)         (4,416,903)

Net Assets Available for Benefits,
   Beginning of Year                         27,069,394          41,994,760
                                            -----------         -----------
Net Assets Available for Benefits,
   End of Year                              $26,135,321         $43,531,471
                                            ===========         ===========

     See Accompanying Notes to Financial Statements

                                       18
<PAGE>

ILLINOIS POWER COMPANY
INCENTIVE SAVINGS PLAN

Statement of Changes in Net Assets Available for Benefits
with Fund Information for the Year Ended December 31, 1998

                                             Fidelity
                                            Retirement
                                              Growth                Loan
                                               Fund                 Fund

Sources of Participants' Equity:
   Contributions:
         Employee                           $ 2,353,790         $        0
         Employer                                     0                  0
                                            -----------         ----------
                                              2,353,790                  0
                                            -----------         ----------

 Plan-to-Plan Transfers                         214,106             50,743

   Investment Income:
       Dividend and Interest Income           4,536,780                  0
       Net Change in Fair Value of
         Investments                          7,365,614                  0
                                            -----------         ----------
                                             11,902,394                  0
                                            -----------         ----------
Application of Participants' Equity:
       Distributions to Active and
         Terminated Participants              1,762,336            132,341
       Administrative and Miscellaneous
         Expenses                                 1,259                  0
                                            -----------         ----------
                                              1,763,595            132,341
                                            -----------         ----------
Increase (Decrease) in Net Assets
   Available for Benefits prior to
  interfund transfers                        12,706,695           (81,598)

Loans to Participants, net                      (171,523)          347,988

Fund-to-Fund Transfers                        (1,000,362)                0

Net Assets Available for Benefits,
   Beginning of Year                         33,181,780          3,865,870
                                            -----------         ----------
Net Assets Available for Benefits,
   End of Year                              $44,716,590         $4,132,260
                                            ===========         ==========

     See Accompanying Notes to Financial Statements

                                       19
<PAGE>

ILLINOIS POWER COMPANY
INCENTIVE SAVINGS PLAN

Statement of Changes in Net Assets Available for Benefits
with Fund Information for the Year Ended December 31, 1998

                                             Fidelity             Fidelity
                                               Asset               Asset
                                              Manager             Manager
                                             Income Fund         Growth Fund
Sources of Participants' Equity:
   Contributions:
         Employee                             $167,485            $646,313
         Employer                                    0                   0
                                            ----------          ----------
                                               167,485             646,313
                                            ----------          ----------

 Plan-to-Plan Transfers                          4,414             (13,367)

   Investment Income:
       Dividend and Interest Income            150,728           1,140,846
       Net Change in Fair Value of
         Investments                             7,534             149,993
                                            ----------          ----------
                                               158,262           1,290,839
                                            ----------          ----------
Application of Participants' Equity:
       Distributions to Active and
         Terminated Participants                82,692             405,276
       Administrative and Miscellaneous
         Expenses                                   15                  11
                                            ----------          ----------
                                                82,707             405,287
                                            ----------          ----------
Increase (Decrease) in Net Assets
   Available for Benefits prior to
  interfund transfers                          247,454           1,518,498

Loans to Participants, net                       3,757              (8,174)

Fund-to-Fund Transfers                         488,540            (855,271)

Net Assets Available for Benefits,
   Beginning of Year                         1,185,068           7,393,174
                                            ----------          ----------
Net Assets Available for Benefits,
   End of Year                              $1,924,819          $8,048,227
                                            ==========          ==========

     See Accompanying Notes to Financial Statements

                                       20
<PAGE>

ILLINOIS POWER COMPANY
INCENTIVE SAVINGS PLAN

Statement of Changes in Net Assets Available for Benefits
with Fund Information for the Year Ended December 31, 1998

                                               Fidelity           Fidelity
                                                 Asset          International
                                                Manager          Growth and
                                                 Fund            Income Fund
Sources of Participants' Equity:
   Contributions:
         Employee                            $  718,061         $  339,656
         Employer                                     0                  0
                                             ----------         ----------
                                                718,061            339,656
                                             ----------         ----------

 Plan-to-Plan Transfers                          (7,016)            (2,962)

   Investment Income:
       Dividend and Interest Income           1,956,534            123,629
       Net Change in Fair Value of
         Investments                           (446,214)           179,095
                                             ----------         ----------
                                              1,510,320            302,724
                                             ----------         ----------
Application of Participants' Equity:
       Distributions to Active and
         Terminated Participants                658,278            136,267
       Administrative and Miscellaneous
         Expenses                                    89                359
                                             ----------         ----------
                                                658,367            136,626
                                             ----------         ----------
Increase (Decrease) in Net Assets
   Available for Benefits prior to
  interfund transfers                         1,562,998            502,792

Loans to Participants, net                      (32,784)             2,243

Fund-to-Fund Transfers                          (73,986)          (481,762)

Net Assets Available for Benefits,
   Beginning of Year                          9,384,235          3,358,687
                                             ----------         ----------
Net Assets Available for Benefits,
   End of Year                              $10,840,463         $3,381,960
                                             ==========         ==========

     See Accompanying Notes to Financial Statements

                                       21
<PAGE>

ILLINOIS POWER COMPANY
INCENTIVE SAVINGS PLAN

Statement of Changes in Net Assets Available for Benefits
with Fund Information for the Year Ended December 31, 1998

                                              Fidelity              Fidelity
                                           Managed Income       US Equity Index
                                           Portfolio Fund       Commingled Pool

Sources of Participants' Equity:
   Contributions:
         Employee                           $ 1,137,273         $  694,958
         Employer                                     0                  0
                                            -----------         ----------
                                              1,137,273            694,958
                                            -----------         ----------

 Plan-to-Plan Transfers                          51,030            142,180

   Investment Income:
       Dividend and Interest Income             943,409             25,899
       Net Change in Fair Value of
         Investments                                  0          1,359,719
                                            -----------         ----------
                                                943,409          1,385,618
                                            -----------         ----------
Application of Participants' Equity:
       Distributions to Active and
         Terminated Participants                909,554             97,264
       Administrative and Miscellaneous
         Expenses                                 7,139                  0
                                            -----------         ----------
                                                916,693             97,264
                                            -----------         ----------
Increase (Decrease) in Net Assets
   Available for Benefits prior to
  interfund transfers                         1,215,019          2,125,492

Loans to Participants, net                      (70,630)            (7,515)

Fund-to-Fund Transfers                        1,317,845          2,535,277

Net Assets Available for Benefits,
   Beginning of Year                         15,073,340          2,867,966
                                            -----------         ----------
Net Assets Available for Benefits,
   End of Year                              $17,535,574         $7,521,220
                                            ===========         ==========

     See Accompanying Notes to Financial Statements

                                       22
<PAGE>

ILLINOIS POWER COMPANY
INCENTIVE SAVINGS PLAN

Statement of Changes in Net Assets Available for Benefits
with Fund Information for the Year Ended December 31, 1998

                                             Founders            USAA
                                               Growth        International
                                                Fund             Fund
Sources of Participants' Equity:
   Contributions:
         Employee                           $  451,359          $202,522
         Employer                                    0                 0
                                            ----------          --------
                                               451,359           202,522
                                            ----------          --------

 Plan-to-Plan Transfers                          3,600            (1,617)

   Investment Income:
       Dividend and Interest Income            237,578            32,242
       Net Change in Fair Value of
         Investments                           438,316            (1,507)
                                            ----------          --------
                                               675,894            30,735
                                            ----------          --------
Application of Participants' Equity:
       Distributions to Active and
         Terminated Participants                66,827            62,713
       Administrative and Miscellaneous
         Expenses                                    0                 0
                                            ----------          --------
                                                66,827            62,713
                                            ----------          --------
Increase (Decrease) in Net Assets
   Available for Benefits prior to
  interfund transfers                        1,064,026           168,927

Loans to Participants, net                      11,185           (31,967)

Fund-to-Fund Transfers                       1,618,791          (123,276)

Net Assets Available for Benefits,
   Beginning of Year                         1,694,684           686,344
                                            ----------          --------
Net Assets Available for Benefits,
   End of Year                              $4,388,686          $700,028
                                            ==========          ========

     See Accompanying Notes to Financial Statements

                                       23
<PAGE>

ILLINOIS POWER COMPANY
INCENTIVE SAVINGS PLAN

Statement of Changes in Net Assets Available for Benefits
with Fund Information for the Year Ended December 31, 1998

                                             Warburg
                                              Pincus              Fidelity
                                             Emerging            Brokerage
                                              Growth               Link

Sources of Participants' Equity:
   Contributions:
         Employee                             $254,892          $   55,473
         Employer                                    0                   0
                                              --------          ----------
                                               254,892              55,473
                                              --------          ----------

 Plan-to-Plan Transfers                          7,415              58,387

   Investment Income:
       Dividend and Interest Income              5,145             736,932
       Net Change in Fair Value of
         Investments                            70,895                   0
                                              --------          ----------
                                                76,040             736,932
                                              --------          ----------
Application of Participants' Equity:
       Distributions to Active and
         Terminated Participants                21,382              16,510
       Administrative and Miscellaneous
         Expenses                                    0              60,613
                                              --------          ----------
                                                21,382              77,123
                                              --------          ----------
Increase (Decrease) in Net Assets
   Available for Benefits prior to
  interfund transfers                          316,965             773,669

Loans to Participants, net                       4,657              32,950

Fund-to-Fund Transfers                         140,278           1,566,623

Net Assets Available for Benefits,
   Beginning of Year                           966,083           1,623,980
                                              --------          ----------
Net Assets Available for Benefits,
   End of Year                              $1,427,983          $3,997,222
                                             =========          ==========

     See Accompanying Notes to Financial Statements

                                       24
<PAGE>

ILLINOIS POWER COMPANY
INCENTIVE SAVINGS PLAN

Statement of Changes in Net Assets Available for Benefits
with Fund Information for the Year Ended December 31, 1998

                                                            Total All
                                                              Funds
Sources of Participants' Equity:
   Contributions:
         Employee                                           $9,534,379
         Employer                                            1,599,690
                                                          ------------
                                                            11,134,069
                                                          ------------

Plan-to-Plan Transfers                                       1,074,726

   Investment Income:
       Dividend and Interest Income                         13,734,280
       Net Change in Fair Value of
         Investments                                        10,051,625
                                                          ------------
                                                            23,785,905
                                                          ------------
Application of Participants' Equity:
       Distributions to Active and
         Terminated Participants                             7,953,357
       Administrative and Miscellaneous
         Expenses                                              104,884
                                                          ------------
                                                             8,058,241
                                                          ------------
Increase (Decrease) in Net Assets
   Available for Benefits prior to
  interfund transfers                                        27,936,459

Loans to Participants, net                                           0

Fund-to-Fund Transfers                                               0

Net Assets Available for Benefits,
   Beginning of Year                                       150,345,365
                                                          ------------
Net Assets Available for Benefits,
   End of Year                                            $178,281,824
                                                          ============

     See Accompanying Notes to Financial Statements

                                       25
<PAGE>


ILLINOIS POWER COMPANY
INCENTIVE SAVINGS PLAN

Statement of Changes in Net Assets Available for Benefits
with Fund Information for the Year Ended December 31, 1997

                                                                   Fidelity
                                             Illinova               Equuity
                                               Stock                Income
                                               Fund                  Fund
Sources of Participants' Equity:
   Contributions:
         Employee                             $ 138,130         $ 2,330,525
         Employer                             2,098,559                   0
                                            -----------         -----------
                                              2,236,689           2,330,525
                                            -----------         -----------

 Plan-to-Plan Transfers                         362,516             173,428

   Investment Income:
       Dividend and Interest Income           1,171,761           2,414,347
       Net Change in Fair Value of
         Investments                           (236,476)          7,457,216
                                            -----------         -----------
                                                935,285           9,871,563
                                            -----------         -----------
Application of Participants' Equity:
       Distributions to Active and
         Terminated Participants              1,337,976           2,104,579
       Administrative and Miscellaneous
         Expenses                                27,756               4,587
                                            -----------         -----------
                                              1,365,732           2,109,166
                                            -----------         -----------
Increase (Decrease) in Net Assets
   Available for Benefits prior to
  interfund transfers                         2,168,758          10,266,350

Loans to Participants, net                        4,991              16,188

Fund-to-Fund Transfers                         (508,012)         (1,051,248)

Net Assets Available for Benefits,
   Beginning of Year                         25,403,657          32,763,470
                                            -----------         -----------
Net Assets Available for Benefits,
   End of Year                              $27,069,394         $41,994,760
                                            ===========         ===========

     See Accompanying Notes to Financial Statements

                                       26
<PAGE>

ILLINOIS POWER COMPANY
INCENTIVE SAVINGS PLAN

Statement of Changes in Net Assets Available for Benefits
with Fund Information for the Year Ended December 31, 1997

                                             Fidelity
                                            Retirement
                                              Growth                Loan
                                               Fund                 Fund

Sources of Participants' Equity:
   Contributions:
         Employee                           $ 2,324,724               $  0
         Employer                                     0                  0
                                            -----------         ----------
                                              2,324,724                  0
                                            -----------         ----------

 Plan-to-Plan Transfers                         329,329             51,768

   Investment Income:
       Dividend and Interest Income           5,818,457                  0
       Net Change in Fair Value of
         Investments                           (309,142)                 0
                                            -----------         ----------
                                              5,509,315                  0
                                            -----------         ----------
Application of Participants' Equity:
       Distributions to Active and
         Terminated Participants              1,375,393            138,629
       Administrative and Miscellaneous
         Expenses                                   923                  0
                                            -----------         ----------
                                              1,376,316            138,629
                                            -----------         ----------
Increase (Decrease) in Net Assets
   Available for Benefits prior to
  interfund transfers                         6,787,052            (86,861)

Loans to Participants, net                      (12,030)            34,873

Fund-to-Fund Transfers                       (3,876,423)                 0

Net Assets Available for Benefits,
   Beginning of Year                         30,283,181          3,917,858
                                            -----------         ----------
Net Assets Available for Benefits,
   End of Year                              $33,181,780         $3,865,870
                                            ===========         ==========

     See Accompanying Notes to Financial Statements

                                       27
<PAGE>

ILLINOIS POWER COMPANY
INCENTIVE SAVINGS PLAN

Statement of Changes in Net Assets Available for Benefits
with Fund Information for the Year Ended December 31, 1997

                                             Fidelity              Fidelity
                                            Asset Manager        Asset Manager
                                             Income Fund            Growth
                                                                     Fund
Sources of Participants' Equity:
   Contributions:
         Employee                           $  115,604          $  613,537
         Employer                                    0                   0
                                            ----------          ----------
                                               115,604             613,537
                                            ----------          ----------

 Plan-to-Plan Transfers                          8,077              73,516

   Investment Income:
       Dividend and Interest Income             78,070             785,862
       Net Change in Fair Value of
         Investments                            51,147             727,905
                                            ----------          ----------
                                               129,217           1,513,767
                                            ----------          ----------
Application of Participants' Equity:
       Distributions to Active and
         Terminated Participants               209,150             279,652
       Administrative and Miscellaneous
         Expenses                                   46                   4
                                            ----------          ----------
                                               209,196             279,656
                                            ----------          ----------
Increase (Decrease) in Net Assets
   Available for Benefits prior to
  interfund transfers                           43,702           1,921,164

Loans to Participants, net                       3,384              (8,120)

Fund-to-Fund Transfers                          15,388             304,151

Net Assets Available for Benefits,
   Beginning of Year                         1,122,594           5,175,979
                                            ----------          ----------
Net Assets Available for Benefits,
   End of Year                              $1,185,068          $7,393,174
                                            ==========          ==========

     See Accompanying Notes to Financial Statements

                                       28
<PAGE>

ILLINOIS POWER COMPANY
INCENTIVE SAVINGS PLAN

Statement of Changes in Net Assets Available for Benefits
with Fund Information for the Year Ended December 31, 1997

                                             Fidelity              Fidelity
                                               Asset             International
                                              Manager              Growth and
                                               Fund                Income Fund
Sources of Participants' Equity:
   Contributions:
         Employee                             $606,566            $374,621
         Employer                                    0                   0
                                            ----------          ----------
                                               606,566             374,621
                                            ----------          ----------

 Plan-to-Plan Transfers                         51,709              (3,351)

   Investment Income:
       Dividend and Interest Income            843,549             225,250
       Net Change in Fair Value of
         Investments                           931,548              60,787
                                            ----------          ----------
                                             1,775,097             286,037
                                            ----------          ----------
Application of Participants' Equity:
       Distributions to Active and
         Terminated Participants               790,382             257,952
       Administrative and Miscellaneous
         Expenses                                    4                 104
                                            ----------          ----------
                                               790,386             258,056
                                            ----------          ----------
Increase (Decrease) in Net Assets
   Available for Benefits prior to
  interfund transfers                        1,642,986             399,251

Loans to Participants, net                     (29,578)              6,375

Fund-to-Fund Transfers                        (440,383)           (802,524)

Net Assets Available for Benefits,
   Beginning of Year                         8,211,210           3,755,585
                                            ----------          ----------
Net Assets Available for Benefits,
   End of Year                              $9,384,235          $3,358,687
                                            ==========          ==========

     See Accompanying Notes to Financial Statements

                                       29
<PAGE>

ILLINOIS POWER COMPANY
INCENTIVE SAVINGS PLAN

Statement of Changes in Net Assets Available for Benefits
with Fund Information for the Year Ended December 31, 1997

                                              Fidelity           Fidelity US
                                            Managed Income      Equity Index
                                            Portfolio Fund      Commingled Pool
Sources of Participants' Equity:
   Contributions:
         Employee                              $805,198            $210,662
         Employer                                     0                   0
                                            -----------          ----------
                                                805,198             210,662
                                            -----------          ----------

 Plan-to-Plan Transfers                          79,844             (26,171)

   Investment Income:
       Dividend and Interest Income             936,837               4,704
       Net Change in Fair Value of
         Investments                                  0             258,350
                                            -----------          ----------
                                                936,837             263,054
                                            -----------          ----------
Application of Participants' Equity:
       Distributions to Active and
         Terminated Participants              1,310,245              12,634
       Administrative and Miscellaneous
         Expenses                                 5,793                   0
                                            -----------          ----------
                                              1,316,038              12,634
                                            -----------          ----------
Increase (Decrease) in Net Assets
   Available for Benefits prior to
  interfund transfers                           505,841             434,911

Loans to Participants, net                      (35,616)              8,888

Fund-to-Fund Transfers                         (474,453)          2,424,167

Net Assets Available for Benefits,
   Beginning of Year                         15,077,568                   0
                                            -----------          ----------
Net Assets Available for Benefits,
   End of Year                              $15,073,340          $2,867,966
                                            ===========          ==========

     See Accompanying Notes to Financial Statements

                                       30
<PAGE>

ILLINOIS POWER COMPANY
INCENTIVE SAVINGS PLAN

Statement of Changes in Net Assets Available for Benefits
with Fund Information for the Year Ended December 31, 1997

                                             Founders              USAA
                                               Growth          International
                                                Fund               Fund
Sources of Participants' Equity:
   Contributions:
         Employee                             $209,244            $72,604
         Employer                                    0                  0
                                            ----------           --------
                                               209,244             72,604
                                            ----------           --------

 Plan-to-Plan Transfers                          3,189              1,035

   Investment Income:
       Dividend and Interest Income            228,086             54,230
       Net Change in Fair Value of
         Investments                          (144,840)           (42,418)
                                            ----------           --------
                                                83,246             11,812
                                            ----------           --------
Application of Participants' Equity:
       Distributions to Active and
         Terminated Participants                12,303                  0
       Administrative and Miscellaneous
         Expenses                                    0                  0
                                            ----------           --------
                                                12,303                  0
                                            ----------           --------
Increase (Decrease) in Net Assets
   Available for Benefits prior to
  interfund transfers                          283,376             85,451

Loans to Participants, net                      (4,856)            (1,727)

Fund-to-Fund Transfers                       1,416,164            602,620

Net Assets Available for Benefits,
   Beginning of Year                                 0                  0
                                            ----------           --------
Net Assets Available for Benefits,
   End of Year                              $1,694,684           $686,344
                                            ==========           ========

     See Accompanying Notes to Financial Statements

                                       31
<PAGE>

ILLINOIS POWER COMPANY
INCENTIVE SAVINGS PLAN

Statement of Changes in Net Assets Available for Benefits
with Fund Information for the Year Ended December 31, 1997

                                             Warburg
                                              Pincus              Fidelity
                                             Emerging            Brokerage
                                              Growth                Link

Sources of Participants' Equity:
   Contributions:
         Employee                           $123,549               $ 26,967
         Employer                                  0                      0
                                            --------             ----------
                                             123,549                 26,967
                                            --------             ----------

 Plan-to-Plan Transfers                        1,376                      0

   Investment Income:
       Dividend and Interest Income           58,962                  4,439
       Net Change in Fair Value of
         Investments                          29,727                      0
                                            --------             ----------
                                              88,689                  4,439
                                            --------             ----------
Application of Participants' Equity:
       Distributions to Active and
         Terminated Participants                   0                      0
       Administrative and Miscellaneous
         Expenses                                  0                 62,738
                                            --------             ----------
                                                   0                 62,738
                                            --------             ----------
Increase (Decrease) in Net Assets
   Available for Benefits prior to
  interfund transfers                        213,614                (31,332)

Loans to Participants, net                       176                 17,052

Fund-to-Fund Transfers                       752,293              1,638,260

Net Assets Available for Benefits,
   Beginning of Year                               0                      0
                                            --------             ----------
Net Assets Available for Benefits,
   End of Year                              $966,083             $1,623,980
                                            ========             ==========

     See Accompanying Notes to Financial Statements

                                       32
<PAGE>

ILLINOIS POWER COMPANY
INCENTIVE SAVINGS PLAN



Statement of Changes in Net Assets Available for Benefits
with Fund Information for the Year Ended December 31, 1997

                                                      Total All
                                                        Funds
Sources of Participants' Equity:
   Contributions:
         Employee                                     $7,951,931
         Employer                                      2,098,559
                                                    ------------
                                                      10,050,490
                                                    ------------

 Plan-to-Plan Transfers                                1,106,265

   Investment Income:
       Dividend and Interest Income                   12,624,554
       Net Change in Fair Value of
         Investments                                   8,783,804
                                                    ------------
                                                      21,408,358
                                                    ------------
Application of Participants' Equity:
       Distributions to Active and
         Terminated Participants                       7,828,895
       Administrative and Miscellaneous
         Expenses                                        101,955
                                                    ------------
                                                       7,930,850
                                                    ------------
Increase (Decrease) in Net Assets
   Available for Benefits prior to
  interfund transfers                                 24,634,263

Loans to Participants, net                                     0

Fund-to-Fund Transfers                                         0

Net Assets Available for Benefits,
   Beginning of Year                                 125,711,102
                                                    ------------
Net Assets Available for Benefits,
   End of Year                                      $150,345,365
                                                    ============

     See Accompanying Notes to Financial Statements

                                       33
<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 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 April 1, 1997, new contributions and balances  transferred from
other options could be invested in five new  alternatives.  The one new Fidelity
fund was the Fidelity  U.S.  Equity Index  Commingled  Pool.  Three mutual funds
managed by other firms  include the  Founders  Growth Fund,  USAA  International
Fund, and the Warburg Pincus Emerging Growth Fund. In addition, participants are
able to buy individual stocks and make other investment choices. Additional fees
apply  for this  service  which is  called  Fidelity  Brokerage  Link.  Fidelity
Management  Trust  Company  will  continue  to  handle  transactions  and  serve
employees accounts, regardless of which funds the participant invests in.

                                       34
<PAGE>

       New  contributions  could also be made, or balances  transferred  to, the
Stock Fund,  the Fidelity  Equity Income Fund,  the Fidelity  Retirement  Growth
Fund,  the Fidelity Asset Manager Income Fund, the Fidelity Asset Manager Growth
Fund,  the Fidelity Asset Manager Fund,  the Fidelity  International  Growth and
Income Fund,  or the Fidelity  Managed  Income  Portfolio  Fund,  which were not
affected by the changes.

       Effective  June 1997, the Plan was amended to reflect the change to daily
valuation and elections  through  telephonic  delivery;  permit  participants to
request a loan from amounts that have been rolled over to the Plan; increase the
maximum  Company  Incentive  Contribution;   clarify  that  if  a  participant's
additions exceeds the limits of section 415 of the IRC, correction will first be
made by distributing the participant's  after-tax and 401(k) contributions;  and
clarify  that a  participant  must be an active  employee on the last day of the
plan year to receive a Company Incentive Contribution for that plan year.

       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 first $80 of the participants'  monthly  before-tax  contributions
and 25% of the balance of deferrals per month,  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

                                       35
<PAGE>

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, 1998,  350,841 and 339,205  shares have been allocated
to  salaried   employees  for  Matching   Contribution  and  Company   Incentive
Contributions.

       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

                                       36
<PAGE>

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 1998,  the interest rate ranged from
8.75% to 9.50%, however for 1997 the rate was 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:

       It is expected that the Plan will be  continued,  but 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.


                                       37
<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:

       The guaranteed investment fund is valued at contract value as reported to
the Plan by the Trustee.  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.

       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 as
reflected in the Statement of Changes in Net Assets  Available for Benefits with
Fund Information.

       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.

                                       38
<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.

       Reclassifications:

       Certain reclassifications have been made to the 1997 financial statements
to conform with the 1998 presentation.

                                       39
<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:

                                                     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




                                                     December 31, 1997

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

Illinova Common Stock                 964,040     $25,968,828      $20,374,849

Fidelity Equity Income
Fund                                  799,689     $41,911,711      $28,462,446

Fidelity Retirement
Growth Fund                         1,964,771     $33,106,384      $34,459,220

Fidelity Asset Manager
Fund                                  510,242     $ 9,362,941      $ 7,937,016

Fidelity Managed Income
Portfolio Fund                     15,046,006     $15,046,006      $15,046,006

                                       40
<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 $3,773,625 in 268  transactions and
sold shares, the proceeds of which totaled $3,535,604, in 238 transactions.  The
net  gain  on  these  sales  was  $916,076.   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, 1998
are listed below:

                                              Purchase         Purchase
Fund                                        Transactions        Amount

Fidelity Equity Income Fund                     230          $ 8,007,695

Fidelity Retirement Growth Fund                 229          $10,361,828

Fidelity Asset Manager Income Fund              123          $ 1,447,349

Fidelity Asset Manager Growth Fund              169          $ 2,273,648

Fidelity Asset Manager Fund                     172          $ 3,565,259

Fidelity International Growth and
Income Fund                                     145            $ 716,172

Fidelity Managed Income Portfolio
Fund                                            184          $ 8,792,668

Fidelity US Equity Index
Commingled Pool                                 188          $ 5,309,214

Founders Growth Fund                            163          $ 3,069,832

USAA International Fund                         112            $ 584,698

Warburg Pincus Emerging Growth                  147            $ 996,298

Fidelity Brokerage Link                          80          $ 2,406,796

Cash Portfolio                                  134          $ 4,063,789

                                       41
<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, 1998 are
shown below:
                                            Sales
                                            Trans-     Sales
Fund                                       actions     Amount        Gain

Fidelity Equity Income Fund                  204     $9,175,677   $2,317,821

Fidelity Retirement Growth
Fund                                         201     $6,211,043     $467,294

Fidelity Asset Manager Income
Fund                                          58       $717,330     $ 15,196

Fidelity Asset Manager Growth
Fund                                         120     $1,771,486     $267,679

Fidelity Asset Manager Fund                  128     $1,666,478     $275,443

Fidelity International Growth
and Income Fund                              104       $871,829     $ 68,018

Fidelity Managed Income
Portfolio Fund                               187     $6,336,041            0

Fidelity US Equity Index
Commingled Pool                               90     $2,030,099     $161,427

Founders Growth Fund                          75       $882,933   $ (13,110)

USAA International Fund                       52       $570,246     $(9,526)

Warburg Pincus Emerging
Growth                                        68       $607,291     $ 23,688

Fidelity Brokerage Link                      252       $ 35,295            0

Cash Portfolio                               198     $4,012,042            0

                                       42
<PAGE>

NOTE 5 - SUBSEQUENT EVENT

           Illinova has  announced an intention to merge with Dynegy.  Status of
the plan following the merger has not been determined.

                                       43
<PAGE>

                                                             Line 27a Schedule I

                             Illinois Power Company
                             Incentive Savings Plan

                 Schedule of Assets Held for Investment Purposes
                                December 31, 1998

Identity of Issue/                                              Current
Description of Investment                        Cost            Value

*Illinova Common Stock                        $21,420,783     $25,546,700

*Fidelity Equity Income Fund                   29,612,286      43,442,523

*Fidelity Retirement Growth Fund               39,077,290      44,622,782

*Fidelity Asset Manager Income Fund             1,854,894       1,918,843

*Fidelity Asset Manager Growth Fund             7,028,069       8,025,684

*Fidelity Asset Manager Fund                   10,111,240      10,815,508

*Fidelity International Growth and
Income Fund                                     3,025,196       3,370,968

*Fidelity Managed Income Portfolio
Fund                                           17,502,633      17,502,633

*Fidelity US Equity Index
Commingled Pool                                 6,059,024       7,493,956

*Founders Growth Fund                           4,073,841       4,372,705

*USAA International Fund                          743,050         696,540

*Warburg Pincus Emerging Growth                 1,363,254       1,421,588

*Fidelity Brokerage Link                        3,992,883       3,992,883

*Participant Loans**                            4,190,017       4,190,017
                                                ---------       ---------

                                             $150,054,460    $177,413,330
                                             ============    ============

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


<PAGE>

<TABLE>
<CAPTION>

                                                                                                                Line 27d Schedule II


                                                        Illinois Power Company
                                                        Incentive Savings Plan


                                                 Schedule of Reportable Transactions *
                                                 for the Year Ended December 31, 1998


                                                                   Expense                             Current
Identity of                                                       Incurred                            Value of
Party Involved/              Purchase     Selling     Lease         with          Cost of             Asset on
Description of Asset          Price        Price     Rental        Trans           Asset              Trans Dt             Net Gain
- --------------------      -----------   ----------   ------       --------     -----------          ----------           -----------

Fidelity Equity
<S>                       <C>           <C>             <C>         <C>        <C>                  <C>                  <C>
Income Fund               $ 8,007,695   $9,175,677      N/A         N/A        $6,857,856           $9,175,677           $2,317,821

Fidelity Retirement
Growth Fund               $10,361,828   $6,211,043      N/A         N/A        $5,743,749           $6,211,043             $467,294

Fidelity Managed
Income Portfolio Fund     $ 8,792,668    $6,336,041     N/A         N/A        $6,336,041           $6,336,041                    0
</TABLE>


* Transactions or series of transactions in excess of 5% of the current value of
the Plan's  assets as of December 31, 1997 as defined in Section  2520.103-6  of
the Department of Labor Rules and Regulations for Reporting and Disclosure under
ERISA.


<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/s/Kim B. Leftwith
                                                 Kim B. Leftwich
                                                 Vice-President

        Date: June 28, 1999






                                  EXHIBIT INDEX

                             Exhibits Filed Herewith



            Exhibit No.           Description
- --------------------------------------------------------------------------------

               1                  Consent of Independent Accountants



<PAGE>

                                                                       Exhibit 1

                       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 18, 1999  relating to the financial  statements  of Illinois  Power Company
Incentive  Savings Plan for the year ended  December 31, 1998,  which appears in
this Form 11-K.






by /s/ PricewaterhouseCoopers LLP

St. Louis, Missouri
June 28, 1999



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