SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                    FORM 11-K

                   ANNUAL REPORT PURSUANT TO SECTION 15(dd) 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
                          for Employees Covered Under a
                         Collective Bargaining Agreement
                            (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.)






                             ILLINOIS POWER COMPANY
                             INCENTIVE SAVINGS PLAN
                          FOR EMPLOYEES COVERED UNDER A
                         COLLECTIVE BARGAINING AGREEMENT



                              FINANCIAL STATEMENTS
                           AND ADDITIONAL INFORMATION




                                DECEMBER 31, 1998






                             ILLINOIS POWER COMPANY
                             INCENTIVE SAVINGS PLAN
                          FOR EMPLOYEES COVERED UNDER A
                         COLLECTIVE BARGAINING AGREEMENT


            Index to Financial Statements and Additional Information

Financial Statements:                                                 Page

      Report of Independent Accountants                                  1

      Statements of Net Assets  Available
      for Benefits with Fund Information as
      of December 31, 1998 and 1997                                    2-7

      Statements  of Changes  in Net Assets Available
      for Benefits with Fund Information for the
      years ended December 31, 1997 and 1996                          8-23

      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.



ILLINOIS POWER COMPANY
INCENTIVE SAVINGS PLAN FOR EMPLOYEES COVERED
UNDER A COLLECTIVE BARGAINING AGREEMENT


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     $   318,089          $         0
   Investments at Fair Value                23,325,275           24,282,284
                                           -----------          -----------
       Total Investments                    23,643,364           24,282,284

   Dividends and Interest Receivable             1,155                    0
   Employee Contributions Receivable           137,940               35,887
   Employer Contributions Receivable           200,413                    0
   Loan Repayments Receivable                      812                8,114
   Loans Outstanding                                 0                    0
                                           -----------          -----------
       Other Assets                            340,320               44,001
                                           -----------          -----------
   Total Assets                             23,983,684           24,326,285
                                           -----------          -----------

LIABILITIES:
   Accrued Expenses                             59,712                    0
                                           -----------          -----------
   Total Liabilities                            59,712                    0
                                           -----------          -----------
NET ASSETS AVAILABLE FOR BENEFITS          $23,923,972          $24,326,285
                                           ===========          ===========


     See Accompanying Notes to Financial Statements

                                       2


ILLINOIS POWER COMPANY
INCENTIVE SAVINGS PLAN FOR EMPLOYEES COVERED
UNDER A COLLECTIVE BARGAINING AGREEMENT



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                29,002,482                   0
                                           -----------          ----------
       Total Investments                    29,002,482                   0

   Dividends and Interest Receivable                 0                   0
   Employee Contributions Receivable            40,674                   0
   Employer Contributions Receivable                 0                   0
   Loan Repayments Receivable                   39,492            (62,283)
   Loans Outstanding                                 0           3,447,568
                                           -----------          ----------
       Other Assets                             80,166           3,385,285
                                           -----------          ----------
   Total Assets                             29,082,648           3,385,285
                                           -----------          ----------

LIABILITIES:
   Accrued Expenses                                  0                   0
                                           -----------          ----------
   Total Liabilities                                 0                   0
                                           -----------          ----------
NET ASSETS AVAILABLE FOR BENEFITS          $29,082,648          $3,385,285
                                           ===========          ==========


     See Accompanying Notes to Financial Statements

                                       3


ILLINOIS POWER COMPANY
INCENTIVE SAVINGS PLAN FOR EMPLOYEES COVERED
UNDER A COLLECTIVE BARGAINING AGREEMENT



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                  519,921                4,135,718
                                           ----------               ----------
       Total Investments                      519,921                4,135,718

   Dividends and Interest Receivable                0                        0
   Employee Contributions Receivable            1,218                    7,507
   Employer Contributions Receivable                0                        0
   Loan Repayments Receivable                     204                    1,915
   Loans Outstanding                                0                        0
                                           ----------               ----------
       Other Assets                             1,422                    9,422
                                           ----------               ----------
   Total Assets                               521,343                4,145,140
                                           ----------               ----------

LIABILITIES:
   Accrued Expenses                                 0                        0
                                           ----------               ----------
   Total Liabilities                                0                        0
                                           ----------               ----------
NET ASSETS AVAILABLE FOR BENEFITS            $521,343               $4,145,140
                                           ==========               ==========


     See Accompanying Notes to Financial Statements

                                       4


ILLINOIS POWER COMPANY
INCENTIVE SAVINGS PLAN FOR EMPLOYEES COVERED
UNDER A COLLECTIVE BARGAINING AGREEMENT



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                4,746,452            1,515,820
                                           ----------           ----------
       Total Investments                    4,746,452            1,515,820

   Dividends and Interest Receivable                0                    0
   Employee Contributions Receivable            8,379                3,441
   Employer Contributions Receivable                0                    0
   Loan Repayments Receivable                   1,864                  916
   Loans Outstanding                                0                    0
                                           ----------           ----------
       Other Assets                            10,243                4,357
                                           ----------           ----------
   Total Assets                             4,756,695            1,520,177
                                           ----------           ----------

LIABILITIES:
   Accrued Expenses                                 0                    0
                                           ----------           ----------
   Total Liabilities                                0                    0
                                           ----------           ----------
NET ASSETS AVAILABLE FOR BENEFITS          $4,756,695           $1,520,177
                                           ==========           ==========


     See Accompanying Notes to Financial Statements

                                       5


ILLINOIS POWER COMPANY
INCENTIVE SAVINGS PLAN FOR EMPLOYEES COVERED
UNDER A COLLECTIVE BARGAINING AGREEMENT



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                11,877,172           3,190,596
                                           -----------          ----------
       Total Investments                    11,877,172           3,190,596

   Dividends and Interest Receivable                 0                   0
   Employee Contributions Receivable            17,261               9,286
   Employer Contributions Receivable                 0                   0
   Loan Repayments Receivable                    5,570               1,758
   Loans Outstanding                                 0                   0
                                           -----------          ----------
       Other Assets                             22,831              11,044
                                           -----------          ----------
   Total Assets                             11,900,003           3,201,640
                                           -----------          ----------

LIABILITIES:
   Accrued Expenses                                  0                   0
                                           -----------          ----------
   Total Liabilities                                 0                   0
                                           -----------          ----------
NET ASSETS AVAILABLE FOR BENEFITS          $11,900,003          $3,201,640
                                           ===========          ==========


     See Accompanying Notes to Financial Statements

                                       6


ILLINOIS POWER COMPANY
INCENTIVE SAVINGS PLAN FOR EMPLOYEES COVERED
UNDER A COLLECTIVE BARGAINING AGREEMENT



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                1,255,200             268,976
                                           ----------            --------
       Total Investments                    1,255,200             268,976

   Dividends and Interest Receivable                0                   0
   Employee Contributions Receivable            4,698                 779
   Employer Contributions Receivable                0                   0
   Loan Repayments Receivable                     709                  73
   Loans Outstanding                                0                   0
                                           ----------            --------
       Other Assets                             5,407                 852
                                           ----------            --------
   Total Assets                             1,260,607             269,828
                                           ----------            --------

LIABILITIES:
   Accrued Expenses                                 0                   0
                                           ----------            --------
   Total Liabilities                                0                   0
                                           ----------            --------
NET ASSETS AVAILABLE FOR BENEFITS          $1,260,607            $269,828
                                           ==========           =========


     See Accompanying Notes to Financial Statements

                                       7


ILLINOIS POWER COMPANY
INCENTIVE SAVINGS PLAN FOR EMPLOYEES COVERED
UNDER A COLLECTIVE BARGAINING AGREEMENT



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                  558,770              866,805
                                             --------           ----------
       Total Investments                      558,770              866,805

   Dividends and Interest Receivable                0                    0
   Employee Contributions Receivable            1,704                  872
   Employer Contributions Receivable                0                    0
   Loan Repayments Receivable                     243                  613
   Loans Outstanding                                0                    0
                                             --------           ----------
       Other Assets                             1,947                1,485
                                             --------           ----------
   Total Assets                               560,717              868,290
                                             --------           ----------

LIABILITIES:
   Accrued Expenses                                 0                    0
                                             --------           ----------
   Total Liabilities                                0                    0
                                             --------           ----------
NET ASSETS AVAILABLE FOR BENEFITS            $560,717             $868,290
                                           ==========           ==========


     See Accompanying Notes to Financial Statements

                                       8


ILLINOIS POWER COMPANY
INCENTIVE SAVINGS PLAN FOR EMPLOYEES COVERED
UNDER A COLLECTIVE BARGAINING AGREEMENT


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

                                                 Total All
                                                   Funds
ASSETS:
   Cash and Temporary Cash Investments            $ 318,089
   Investments at Fair Value                    105,545,471
                                               ------------
       Total Investments                        105,863,558

   Dividends and Interest Receivable                  1,155
   Employee Contributions Receivable                269,646
   Employer Contributions Receivable                200,413
   Loan Repayments Receivable                             0
   Loans Outstanding                              3,447,568
                                               ------------
       Other Assets                               3,918,782
                                               ------------
   Total Assets                                 109,782,342
                                               ------------

LIABILITIES:
   Accrued Expenses                                  59,712
                                               ------------
   Total Liabilities                                 59,712
                                               ------------
NET ASSETS AVAILABLE FOR BENEFITS              $109,722,630
                                               ============


     See Accompanying Notes to Financial Statements

                                       9


ILLINOIS POWER COMPANY
INCENTIVE SAVINGS PLAN FOR EMPLOYEES COVERED
UNDER A COLLECTIVE BARGAINING AGREEMENT


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      $   225,140         $         0
   Investments at Fair Value                 23,978,597          22,793,804
                                            -----------         -----------
       Total Investments                     24,203,737          22,793,804

   Dividends and Interest Receivable              1,009                   0
   Employee Contributions Receivable             22,489              88,452
   Employer Contributions Receivable            623,739                   0
   Loan Repayments Receivable                     1,116              16,526
   Loans Outstanding                                  0                   0
                                            -----------         -----------
       Other Assets                             648,353             104,978
                                            -----------         -----------
   Total Assets                              24,852,090          22,898,782
                                            -----------         -----------

LIABILITIES:
   Accrued Expenses                               2,469                   0
                                            -----------         -----------
   Total Liabilities                              2,469                   0
                                            -----------         -----------
NET ASSETS AVAILABLE FOR BENEFITS           $24,849,621         $22,898,782
                                            ===========         ===========


     See Accompanying Notes to Financial Statements

                                       10


ILLINOIS POWER COMPANY
INCENTIVE SAVINGS PLAN FOR EMPLOYEES COVERED
UNDER A COLLECTIVE BARGAINING AGREEMENT


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                20,643,042                   0
                                           -----------          ----------
       Total Investments                    20,643,042                   0

   Dividends and Interest Receivable                 0                   0
   Employee Contributions Receivable            84,167                   0
   Employer Contributions Receivable                 0                   0
   Loan Repayments Receivable                   18,408            (60,929)
   Loans Outstanding                                 0           3,178,759
                                           -----------          ----------
       Other Assets                            102,575           3,117,830
                                           -----------          ----------
   Total Assets                             20,745,617           3,117,830
                                           -----------          ----------

LIABILITIES:
   Accrued Expenses                                  0                   0
                                           -----------          ----------
   Total Liabilities                                 0                   0
                                           -----------          ----------
NET ASSETS AVAILABLE FOR BENEFITS          $20,745,617          $3,117,830
                                           ===========          ==========

     See Accompanying Notes to Financial Statements

                                       11


ILLINOIS POWER COMPANY
INCENTIVE SAVINGS PLAN FOR EMPLOYEES COVERED
UNDER A COLLECTIVE BARGAINING AGREEMENT


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                453,190                3,392,633
                                           --------               ----------
       Total Investments                    453,190                3,392,633

   Dividends and Interest Receivable              0                        0
   Employee Contributions Receivable          2,500                   17,470
   Employer Contributions Receivable              0                        0
   Loan Repayments Receivable                   357                    3,142
   Loans Outstanding                              0                        0
                                           --------               ----------
       Other Assets                           2,857                   20,612
                                           --------               ----------
   Total Assets                             456,047                3,413,245
                                           --------               ----------

LIABILITIES:
   Accrued Expenses                               0                        0
                                           --------               ----------
   Total Liabilities                              0                        0
                                           --------               ----------
NET ASSETS AVAILABLE FOR BENEFITS          $456,047               $3,413,245
                                           ========               ==========


     See Accompanying Notes to Financial Statements

                                       12


ILLINOIS POWER COMPANY
INCENTIVE SAVINGS PLAN FOR EMPLOYEES COVERED
UNDER A COLLECTIVE BARGAINING AGREEMENT


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                3,930,020            1,467,400
                                           ----------           ----------
       Total Investments                    3,930,020            1,467,400

   Dividends and Interest Receivable                0                    0
   Employee Contributions Receivable           18,312                9,490
   Employer Contributions Receivable                0                    0
   Loan Repayments Receivable                   5,375                2,046
   Loans Outstanding                                0                    0
                                           ----------           ----------
       Other Assets                            23,687               11,536
                                           ----------           ----------
   Total Assets                             3,953,707            1,478,936
                                           ----------           ----------

LIABILITIES:
   Accrued Expenses                                 0                    0
                                           ----------           ----------
   Total Liabilities                                0                    0
                                           ----------           ----------
NET ASSETS AVAILABLE FOR BENEFITS          $3,953,707           $1,478,936
                                           ==========           ==========


     See Accompanying Notes to Financial Statements

                                       13


ILLINOIS POWER COMPANY
INCENTIVE SAVINGS PLAN FOR EMPLOYEES COVERED
UNDER A COLLECTIVE BARGAINING AGREEMENT


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                10,751,250           1,442,606
                                           -----------          ----------
       Total Investments                    10,751,250           1,442,606

   Dividends and Interest Receivable                 0                   0
   Employee Contributions Receivable            37,258              13,897
   Employer Contributions Receivable                 0                   0
   Loan Repayments Receivable                    9,457               2,204
   Loans Outstanding                                 0                   0
                                           -----------          ----------
       Other Assets                             46,715              16,101
                                           -----------          ----------
   Total Assets                             10,797,965           1,458,707
                                           -----------          ----------

LIABILITIES:
   Accrued Expenses                                  0                   0
                                           -----------          ----------
   Total Liabilities                                 0                   0
                                           -----------          ----------
NET ASSETS AVAILABLE FOR BENEFITS          $10,797,965          $1,458,707
                                           ===========          ==========


     See Accompanying Notes to Financial Statements

                                       14


ILLINOIS POWER COMPANY
INCENTIVE SAVINGS PLAN FOR EMPLOYEES COVERED
UNDER A COLLECTIVE BARGAINING AGREEMENT


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                525,426              172,900
                                           --------             --------
       Total Investments                    525,426              172,900

   Dividends and Interest Receivable              0                    0
   Employee Contributions Receivable          5,662                1,624
   Employer Contributions Receivable              0                    0
   Loan Repayments Receivable                 1,017                  157
   Loans Outstanding                              0                    0
                                           --------             --------
       Other Assets                           6,679                1,781
                                           --------             --------
   Total Assets                             532,105              174,681
                                           --------             --------

LIABILITIES:
   Accrued Expenses                               0                    0
                                           --------             --------
   Total Liabilities                              0                    0
                                           --------             --------
NET ASSETS AVAILABLE FOR BENEFITS          $532,105             $174,681
                                           ========             ========


     See Accompanying Notes to Financial Statements

                                       15


ILLINOIS POWER COMPANY
INCENTIVE SAVINGS PLAN FOR EMPLOYEES COVERED
UNDER A COLLECTIVE BARGAINING AGREEMENT


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                326,002              516,147
                                           --------             --------
       Total Investments                    326,002              516,147

   Dividends and Interest Receivable              0                    0
   Employee Contributions Receivable          2,478                  293
   Employer Contributions Receivable              0                    0
   Loan Repayments Receivable                   289                  835
   Loans Outstanding                              0                    0
                                           --------             --------
       Other Assets                           2,767                1,128
                                           --------             --------
   Total Assets                             328,769              517,275
                                           --------             --------

LIABILITIES:
   Accrued Expenses                               0                    0
                                           --------             --------
   Total Liabilities                              0                    0
                                           --------             --------
NET ASSETS AVAILABLE FOR BENEFITS          $328,769             $517,275
                                           ========             ========


     See Accompanying Notes to Financial Statements

                                       16


ILLINOIS POWER COMPANY
INCENTIVE SAVINGS PLAN FOR EMPLOYEES COVERED
UNDER A COLLECTIVE BARGAINING AGREEMENT



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

                                                Total All
                                                  Funds
ASSETS:
   Cash and Temporary Cash Investments         $   225,140
   Investments at Fair Value                    90,393,017
                                               -----------
       Total Investments                        90,618,157

   Dividends and Interest Receivable                 1,009
   Employee Contributions Receivable               304,092
   Employer Contributions Receivable               623,739
   Loan Repayments Receivable                            0
   Loans Outstanding                             3,178,759
                                               -----------
       Other Assets                              4,107,599
                                               -----------
   Total Assets                                 94,725,756
                                               -----------

LIABILITIES:
   Accrued Expenses                                  2,469
                                               -----------
   Total Liabilities                                 2,469
                                               -----------
NET ASSETS AVAILABLE FOR BENEFITS              $94,723,287
                                               ===========


     See Accompanying Notes to Financial Statements

                                       17


ILLINOIS POWER COMPANY
INCENTIVE SAVINGS PLAN FOR EMPLOYEES COVERED
UNDER A COLLECTIVE BARGAINING AGREEMENT

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

                                             Illinova              Fidelity
                                               Stock                Equity
                                               Fund               Income Fund
Sources of Participants' Equity:
   Contributions:
         Employee                           $   87,346           $1,889,199
         Employer                            1,387,445                    0
                                           -----------          -----------
                                             1,474,791            1,889,199
                                           -----------          -----------

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

   Investment Income:
       Dividend and Interest Income          1,137,015            1,491,323
       Net Change in Fair Value of
         Investments                        (1,732,000)          1,262,044
                                           -----------          -----------
                                              (594,985)          2,753,367
                                           -----------          -----------
Application of Participants' Equity:
       Distributions to Active and
         Terminated Participants             1,289,513           1,083,400
       Administrative and Miscellaneous
         Expenses                               24,431               9,020
                                           -----------          -----------
                                             1,313,944           1,092,420
                                           -----------          -----------
Increase (Decrease) in Net Assets
  Available for Benefits prior to
  interfund transfers                         (616,307)          3,164,502

Loans to Participants, net                     (35,148)           (170,309)

Fund-to-Fund Transfers                        (274,194)         (1,566,690)

Net Assets Available for Benefits,
   Beginning of Year                        24,849,621          22,898,782
                                           -----------          -----------
Net Assets Available for Benefits,
   End of Year                             $23,923,972         $24,326,285
                                           ===========         ============

     See Accompanying Notes to Financial Statements

                                       18


ILLINOIS POWER COMPANY
INCENTIVE SAVINGS PLAN FOR EMPLOYEES COVERED
UNDER A COLLECTIVE BARGAINING AGREEMENT

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

                                             Fidelity
                                            Retirement             Loan
                                            Growth Fund            Fund

Sources of Participants' Equity:
   Contributions:
         Employee                          $ 1,877,258          $        0
         Employer                                    0                   0
                                           -----------          ----------
                                             1,877,258                   0
                                           -----------          ----------

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

   Investment Income:
       Dividend and Interest Income          2,949,899                   0
       Net Change in Fair Value of
         Investments                         4,577,774                   0
                                           -----------          ----------
                                             7,527,673                   0
                                           -----------          ----------
Application of Participants' Equity:
       Distributions to Active and
         Terminated Participants               806,565              78,337
       Administrative and Miscellaneous
         Expenses                                1,712                   0
                                           -----------          ----------
                                               808,277              78,337
                                           -----------          ----------
Increase (Decrease) in Net Assets
  Available for Benefits prior to
  interfund transfers                        8,382,548            (129,080)

Loans to Participants, net                     (63,373)            396,535

Fund-to-Fund Transfers                          17,856                   0

Net Assets Available for Benefits,
   Beginning of Year                        20,745,617           3,117,830
                                           -----------          ----------
Net Assets Available for Benefits,
   End of Year                             $29,082,648          $3,385,285
                                           ===========          ==========

     See Accompanying Notes to Financial Statements

                                       19


ILLINOIS POWER COMPANY
INCENTIVE SAVINGS PLAN FOR EMPLOYEES COVERED
UNDER A COLLECTIVE BARGAINING AGREEMENT

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

                                            Fidelity              Fidelity
                                           Asset Manager        Asset Manager
                                            Income Fund           Growth Fund
Sources of Participants' Equity:
   Contributions:
         Employee                          $   54,493           $  392,909
         Employer                                   0                    0
                                           ----------           ----------
                                               54,493              392,909
                                           ----------           ----------

Plan-to-Plan Transfers                         (4,413)              13,367

   Investment Income:
       Dividend and Interest Income            43,633              587,331
       Net Change in Fair Value of
         Investments                            5,024               70,438
                                           ----------           ----------
                                               48,657              657,769
                                           ----------           ----------
Application of Participants' Equity:
       Distributions to Active and
         Terminated Participants               28,204              172,481
       Administrative and Miscellaneous
         Expenses                                 123                   61
                                           ----------           ----------
                                               28,327              172,542
                                           ----------           ----------
Increase (Decrease) in Net Assets
  Available for Benefits prior to
  interfund transfers                          70,410              891,503

Loans to Participants, net                     (1,420)             (10,081)

Fund-to-Fund Transfers                         (3,694)            (149,527)

Net Assets Available for Benefits,
   Beginning of Year                          456,047            3,413,245
                                           ----------           ----------
Net Assets Available for Benefits,
   End of Year                               $521,343           $4,145,140
                                           ==========           ==========

     See Accompanying Notes to Financial Statements

                                       20


ILLINOIS POWER COMPANY
INCENTIVE SAVINGS PLAN FOR EMPLOYEES COVERED
UNDER A COLLECTIVE BARGAINING AGREEMENT

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

                                            Fidelity               Fidelity
                                              Asset              International
                                           Manager Fund           Growth and
                                                                  IncomeFund
Sources of Participants' Equity:
   Contributions:
         Employee                          $  399,130           $  185,717
         Employer                                   0                    0
                                           ----------           ----------
                                              399,130              185,717
                                           ----------           ----------

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

   Investment Income:
       Dividend and Interest Income           870,651               62,474
       Net Change in Fair Value of
       Investments                           (202,415)              90,499
                                           ----------           ----------
                                              668,236              152,973
                                           ----------           ----------
Application of Participants' Equity:
       Distributions to Active and
         Terminated Participants              191,372               25,237
       Administrative and Miscellaneous
         Expenses                                  91                  114
                                           ----------           ----------
                                              191,463               25,351
                                           ----------           ----------
Increase (Decrease) in Net Assets
  Available for Benefits prior to
  interfund transfers                         882,919              316,301

Loans to Participants, net                    (29,182)              (1,664)

Fund-to-Fund Transfers                        (50,749)            (273,396)

Net Assets Available for Benefits,
   Beginning of Year                        3,953,707            1,478,936
                                           ----------           ----------
Net Assets Available for Benefits,
   End of Year                             $4,756,695           $1,520,177
                                           ==========           ==========

     See Accompanying Notes to Financial Statements

                                       21


ILLINOIS POWER COMPANY
INCENTIVE SAVINGS PLAN FOR EMPLOYEES COVERED
UNDER A COLLECTIVE BARGAINING AGREEMENT

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

                                            Fidelity            Fidelity US
                                           Managed Income       Equity Index
                                           Portfolio Fund      Commingled Pool
Sources of Participants' Equity:
   Contributions:
         Employee                          $   815,446          $  424,590
         Employer                                    0                   0
                                           -----------          ----------
                                               815,446             424,590
                                           -----------          ----------

 Plan-to-Plan Transfers                        (51,032)           (142,182)

   Investment Income:
       Dividend and Interest Income            679,055              15,701
       Net Change in Fair Value of
         Investments                                 0             608,595
                                           -----------          ----------
                                               679,055             624,296
                                           -----------          ----------
Application of Participants' Equity:
       Distributions to Active and
         Terminated Participants               830,212              57,007
       Administrative and Miscellaneous
         Expenses                                9,524                   0
                                           -----------          ----------
                                               839,736              57,007
                                           -----------          ----------
Increase (Decrease) in Net Assets
  Available for Benefits prior to
  interfund transfers                          603,733             849,697

Loans to Participants, net                    (108,139)             (2,490)

Fund-to-Fund Transfers                         606,444             895,726

Net Assets Available for Benefits,
   Beginning of Year                        10,797,965           1,458,707
                                           -----------          ----------
Net Assets Available for Benefits,
   End of Year                             $11,900,003          $3,201,640
                                           ===========          ==========

     See Accompanying Notes to Financial Statements

                                       22


ILLINOIS POWER COMPANY
INCENTIVE SAVINGS PLAN FOR EMPLOYEES COVERED
UNDER A COLLECTIVE BARGAINING AGREEMENT

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                          $  193,880           $ 48,832
         Employer                                   0                  0
                                           ----------           --------
                                              193,880             48,832
                                           ----------           --------

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

   Investment Income:
       Dividend and Interest Income            70,177             10,844
       Net Change in Fair Value of
         Investments                          140,280             (11,741)
                                           ----------           ---------
                                              210,457                (897)
                                           ----------           ---------
Application of Participants' Equity:
       Distributions to Active and
         Terminated Participants                6,352                  0
       Administrative and Miscellaneous
         Expenses                                   0                  0
                                           ----------           --------
                                                6,352                  0
                                           ----------           --------
Increase (Decrease) in Net Assets
  Available for Benefits prior to
  interfund transfers                         394,385             49,552

Loans to Participants, net                     12,626              2,587

Fund-to-Fund Transfers                        321,491             43,008

Net Assets Available for Benefits,
   Beginning of Year                          532,105            174,681
                                           ----------           --------
Net Assets Available for Benefits,
   End of Year                             $1,260,607           $269,828
                                           ==========           ========

     See Accompanying Notes to Financial Statements

                                       23


ILLINOIS POWER COMPANY
INCENTIVE SAVINGS PLAN FOR EMPLOYEES COVERED
UNDER A COLLECTIVE BARGAINING AGREEMENT

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                          $ 81,262             $   12,130
         Employer                                 0                      0
                                           --------             ----------
                                             81,262                 12,130
                                           --------             ----------

 Plan-to-Plan Transfers                      (7,416)               (58,387)

   Investment Income:
       Dividend and Interest Income           1,842                120,932
       Net Change in Fair Value of
         Investments                         28,888                      0
                                           --------             ----------
                                             30,730                120,932
                                           --------             ----------
Application of Participants' Equity:
       Distributions to Active and
         Terminated Participants              5,032                      0
       Administrative and Miscellaneous
         Expenses                                 0                 35,087
                                           --------             ----------
                                              5,032                 35,087
                                           --------             ----------
Increase (Decrease) in Net Assets
  Available for Benefits prior to
  interfund transfers                        99,544                 39,588

Loans to Participants, net                    1,563                  8,495

Fund-to-Fund Transfers                      130,841                302,932

Net Assets Available for Benefits,
   Beginning of Year                        328,769                517,275
                                           --------             ----------
Net Assets Available for Benefits,
   End of Year                             $560,717               $868,290
                                           ========             ==========

     See Accompanying Notes to Financial Statements

                                       24


ILLINOIS POWER COMPANY
INCENTIVE SAVINGS PLAN FOR EMPLOYEES COVERED
UNDER A COLLECTIVE BARGAINING AGREEMENT

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                                 $ 6,462,192
         Employer                                   1,387,445
                                                 ------------
                                                    7,849,637
                                                 ------------

 Plan-to-Plan Transfers                            (1,074,730)

   Investment Income:
       Dividend and Interest Income                 8,040,877
       Net Change in Fair Value of
         Investments                                4,837,386
                                                 ------------
                                                   12,878,263
                                                 ------------
Application of Participants' Equity:
       Distributions to Active and
         Terminated Participants                    4,573,712
       Administrative and Miscellaneous
         Expenses                                      80,163
                                                 ------------
                                                    4,653,875
                                                 ------------
Increase (Decrease) in Net Assets
  Available for Benefits prior to
  interfund transfers                              14,999,295

Loans to Participants, net                                  0

Fund-to-Fund Transfers                                     48

Net Assets Available for Benefits,
   Beginning of Year                               94,723,287
                                                 ------------
Net Assets Available for Benefits,
   End of Year                                   $109,722,630
                                                 ============

     See Accompanying Notes to Financial Statements

                                       25


ILLINOIS POWER COMPANY
INCENTIVE SAVINGS PLAN FOR EMPLOYEES COVERED
UNDER A COLLECTIVE BARGAINING AGREEMENT

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

                                              Illinova            Fidelity
                                               Stock               Equity
                                               Fund              Income Fund
Sources of Participants' Equity:
   Contributions:
         Employee                              $ 87,490         $ 1,890,400
         Employer                             1,762,154                   0
                                            -----------         -----------
                                              1,849,644           1,890,400
                                            -----------         -----------

 Plan-to-Plan Transfers                        (362,516)           (173,427)

   Investment Income:
       Dividend and Interest Income           1,097,468           1,309,266
       Net Change in Fair Value of
         Investments                           (422,572)          3,817,687
                                            -----------         -----------
                                                674,896           5,126,953
                                            -----------         -----------
Application of Participants' Equity:
       Distributions to Active and
         Terminated Participants              1,077,520             756,492
       Administrative and Miscellaneous
         Expenses                                37,347               6,314
                                            -----------         -----------
                                              1,114,867             762,806
                                            -----------         -----------
Increase (Decrease) in Net Assets
  Available for Benefits prior to
  interfund transfers                         1,047,157           6,081,121

Loans to Participants, net                       (6,724)           (172,034)

Fund-to-Fund Transfers                         (457,237)            741,903

Net Assets Available for Benefits,
   Beginning of Year                         24,266,425          16,247,792
                                            -----------         -----------
Net Assets Available for Benefits,
   End of Year                              $24,849,621         $22,898,782
                                            ===========         ===========

     See Accompanying Notes to Financial Statements

                                       26


ILLINOIS POWER COMPANY
INCENTIVE SAVINGS PLAN FOR EMPLOYEES COVERED
UNDER A COLLECTIVE BARGAINING AGREEMENT

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

                                          Fidelity Retirement      Loan
                                              Growth Fund          Fund

Sources of Participants' Equity:
   Contributions:
         Employee                          $ 1,890,161                $  0
         Employer                                    0                   0
                                           -----------          ----------
                                             1,890,161                   0
                                           -----------          ----------

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

   Investment Income:
       Dividend and Interest Income          3,644,909                   0
       Net Change in Fair Value of
         Investments                          (295,168)                  0
                                           -----------          ----------
                                             3,349,741                   0
                                           -----------          ----------
Application of Participants' Equity:
       Distributions to Active and
         Terminated Participants               813,814              79,284
       Administrative and Miscellaneous
         Expenses                                1,597                   0
                                           -----------          ----------
                                               815,411              79,284
                                           -----------          ----------
Increase (Decrease) in Net Assets
  Available for Benefits prior to
  interfund transfers                        4,095,162            (131,052)

Loans to Participants, net                    (155,659)            504,238

Fund-to-Fund Transfers                      (1,647,064)                  0

Net Assets Available for Benefits,
   Beginning of Year                        18,453,178           2,744,644
                                           -----------          ----------
Net Assets Available for Benefits,
   End of Year                             $20,745,617          $3,117,830
                                           ===========          ==========

     See Accompanying Notes to Financial Statements

                                       27


ILLINOIS POWER COMPANY
INCENTIVE SAVINGS PLAN FOR EMPLOYEES COVERED
UNDER A COLLECTIVE BARGAINING AGREEMENT

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                           $71,810               $369,988
         Employer                                 0                      0
                                           --------             ----------
                                             71,810                369,988
                                           --------             ----------

 Plan-to-Plan Transfers                      (8,078)               (73,516)

   Investment Income:
       Dividend and Interest Income          29,285                367,688
       Net Change in Fair Value of
         Investments                         14,718                318,629
                                           --------             ----------
                                             44,003                686,317
                                           --------             ----------
Application of Participants' Equity:
       Distributions to Active and
         Terminated Participants             28,056                 77,393
       Administrative and Miscellaneous
         Expenses                               135                     50
                                           --------             ----------
                                             28,191                 77,443
                                           --------             ----------
Increase (Decrease) in Net Assets
  Available for Benefits prior to
  interfund transfers                        79,544                905,346

Loans to Participants, net                      235                (26,121)

Fund-to-Fund Transfers                       70,609                119,410

Net Assets Available for Benefits,
   Beginning of Year                        305,659              2,414,610
                                           --------             ----------
Net Assets Available for Benefits,
   End of Year                             $456,047             $3,413,245
                                           ========             ==========

     See Accompanying Notes to Financial Statements

                                       28


ILLINOIS POWER COMPANY
INCENTIVE SAVINGS PLAN FOR EMPLOYEES COVERED
UNDER A COLLECTIVE BARGAINING AGREEMENT

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

                                            Fidelity              Fidelity
                                           Asset Manager    International Growth
                                              Fund              and Income Fund
Sources of Participants' Equity:
   Contributions:
         Employee                          $  398,097           $  220,362
         Employer                                   0                    0
                                           ----------           ----------
                                              398,097              220,362
                                           ----------           ----------

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

   Investment Income:
       Dividend and Interest Income           358,830               96,983
       Net Change in Fair Value of
         Investments                          386,629               17,608
                                           ----------           ----------
                                              745,459              114,591
                                           ----------           ----------
Application of Participants' Equity:
       Distributions to Active and
         Terminated Participants              210,913               56,396
       Administrative and Miscellaneous
         Expenses                                 107                  200
                                           ----------           ----------
                                              211,020               56,596
                                           ----------           ----------
Increase (Decrease) in Net Assets
  Available for Benefits prior to
  interfund transfers                         880,827              281,708

Loans to Participants, net                    (52,655)             (15,525)

Fund-to-Fund Transfers                       (332,512)            (269,119)

Net Assets Available for Benefits,
   Beginning of Year                        3,458,047            1,481,872
                                           ----------           ----------
Net Assets Available for Benefits,
   End of Year                             $3,953,707           $1,478,936
                                           ==========           ==========

     See Accompanying Notes to Financial Statements

                                       29


ILLINOIS POWER COMPANY
INCENTIVE SAVINGS PLAN FOR EMPLOYEES COVERED
UNDER A COLLECTIVE BARGAINING AGREEMENT

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                          $   826,080          $  158,523
         Employer                                    0                   0
                                           -----------          ----------
                                               826,080             158,523
                                           -----------          ----------

 Plan-to-Plan Transfers                        (79,845)             26,171

   Investment Income:
       Dividend and Interest Income            678,958               4,482
       Net Change in Fair Value of
         Investments                                 0             115,245
                                           -----------          ----------
                                               678,958             119,727
                                           -----------          ----------
Application of Participants' Equity:
       Distributions to Active and
         Terminated Participants               708,412               4,665
       Administrative and Miscellaneous
         Expenses                                8,606                   0
                                           -----------          ----------
                                               717,018               4,665
                                           -----------          ----------
Increase (Decrease) in Net Assets
  Available for Benefits prior to
  interfund transfers                         708,175              299,756

Loans to Participants, net                   (118,524)              28,254

Fund-to-Fund Transfers                       (792,296)           1,130,697

Net Assets Available for Benefits,
   Beginning of Year                       11,000,610                   0
                                          -----------          ----------
Net Assets Available for Benefits,
   End of Year                            $10,797,965          $1,458,707
                                          ===========          ==========

     See Accompanying Notes to Financial Statements

                                       30


ILLINOIS POWER COMPANY
INCENTIVE SAVINGS PLAN FOR EMPLOYEES COVERED
UNDER A COLLECTIVE BARGAINING AGREEMENT

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                          $ 55,563             $ 22,288
         Employer                                 0                    0
                                           --------             --------
                                             55,563               22,288
                                           --------             --------

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

   Investment Income:
       Dividend and Interest Income          72,159               12,420
       Net Change in Fair Value of
         Investments                        (50,169)             (12,725)
                                           --------             --------
                                             21,990                 (305)
                                           --------             --------
Application of Participants' Equity:
       Distributions to Active and
         Terminated Participants                  0                    0
       Administrative and Miscellaneous
         Expenses                                 0                    0
                                           --------             --------
                                                  0                    0
                                           --------             --------
Increase (Decrease) in Net Assets
  Available for Benefits prior to
  interfund transfers                        74,364               20,948

Loans to Participants, net                    3,770                1,305

Fund-to-Fund Transfers                      453,971              152,428

Net Assets Available for Benefits,
   Beginning of Year                              0                    0
                                           --------             --------
Net Assets Available for Benefits,
   End of Year                             $532,105             $174,681
                                           ========             ========

     See Accompanying Notes to Financial Statements

                                       31


ILLINOIS POWER COMPANY
INCENTIVE SAVINGS PLAN FOR EMPLOYEES COVERED
UNDER A COLLECTIVE BARGAINING AGREEMENT

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                           $35,886               $3,821
         Employer                                 0                    0
                                           --------             --------
                                             35,886                3,821
                                           --------             --------

 Plan-to-Plan Transfers                      (1,375)                   0

   Investment Income:
       Dividend and Interest Income          19,692                2,396
       Net Change in Fair Value of
         Investments                          4,894                    0
                                           --------             --------
                                             24,586                2,396
                                           --------             --------
Application of Participants' Equity:
       Distributions to Active and
         Terminated Participants                  0                    0
       Administrative and Miscellaneous
         Expenses                                 0               57,920
                                           --------             --------
                                                  0               57,920
                                           --------             --------
Increase (Decrease) in Net Assets
  Available for Benefits prior to
  interfund transfers                        59,098              (51,703)

Loans to Participants, net                      803                8,637

Fund-to-Fund Transfers                      268,869              560,341

Net Assets Available for Benefits,
   Beginning of Year                              0                    0
                                           --------             --------
Net Assets Available for Benefits,
   End of Year                             $328,769             $517,275
                                           ========             ========

     See Accompanying Notes to Financial Statements

                                       32


ILLINOIS POWER COMPANY
INCENTIVE SAVINGS PLAN FOR EMPLOYEES COVERED
UNDER A COLLECTIVE BARGAINING AGREEMENT

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                                   $ 6,030,469
         Employer                                     1,762,154
                                                    -----------
                                                      7,792,623
                                                    -----------

 Plan-to-Plan Transfers                              (1,106,265)

   Investment Income:
       Dividend and Interest Income                   7,694,537
       Net Change in Fair Value of
         Investments                                  3,894,776
                                                    -----------
                                                     11,589,313
                                                    -----------
Application of Participants' Equity:
       Distributions to Active and
         Terminated Participants                      3,812,945
       Administrative and Miscellaneous
         Expenses                                       112,276
                                                    -----------
                                                      3,925,221
                                                    -----------
Increase (Decrease) in Net Assets
  Available for Benefits prior to
  interfund transfers                                14,350,451

Loans to Participants, net                                    0

Fund-to-Fund Transfers                                        0

Net Assets Available for Benefits,
   Beginning of Year                                 80,372,837
                                                    -----------
Net Assets Available for Benefits,
   End of Year                                      $94,723,287
                                                    ===========

     See Accompanying Notes to Financial Statements

                                       33


                             ILLINOIS POWER COMPANY
                             INCENTIVE SAVINGS PLAN
                          FOR EMPLOYEES COVERED UNDER A
                         COLLECTIVE BARGAINING AGREEMENT


                          NOTES TO FINANCIAL STATEMENTS

NOTE 1 - DESCRIPTION OF PLAN:

       General:

       The Illinois Power Company  Incentive  Savings Plan for Employees Covered
Under a Collective Bargaining Agreement (the Plan) is sponsored and administered
by Illinois Power Company (the Company). The Plan became effective as of January
1, 1987. 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.

       Illinois  Power  Company  is  a   wholly-owned   subsidiary  of  Illinova
Corporation (Illinova).  Although Illinois Power Company remains the sponsor and
administrator  of the Plan,  all shares of stock  contributed  to  participants'
accounts or held in the Stock Fund are shares of Illinova.

       Participation:

       All  employees  of  the  Company  who  are  covered  under  a  collective
bargaining  agreement are eligible to participate in the Plan.  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

                                       34


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.

       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; 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 contributions 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 Illinova Stock Fund.

                                       35


       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 cash and Illinova stock if specified performance goals are met.
Units awarded under the Incentive Compensation arrangement are held in the Stock
Fund. Dividends earned on these units are also invested in the Stock Fund.

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

       ESOP:

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

       As of December 31, 1998,  341,852 and 340,566  shares have been allocated
to bargaining unit employees for Matching  Contributions  and Company  Incentive
Contributions, respectively.

       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

                                       36


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

       Loans:

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


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


       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


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                        933,011   $23,325,275   $19,405,395

Fidelity Equity Income
Fund                                         437,125   $24,282,284   $17,266,208

Fidelity Retirement
Growth Fund                                1,414,065   $29,002,482   $25,539,827

Fidelity Managed Income
Portfolio Fund                            11,877,171   $11,877,172   $11,877,171



                                                December 31, 1997

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

Illinova Common Stock                        890,194    23,978,597    18,813,033

Fidelity Equity Income
Fund                                         434,913   $22,793,804   $16,044,188

Fidelity Retirement
Growth Fund                                1,225,106   $20,643,042   $21,559,849

Fidelity Managed Income
Portfolio Fund                            10,751,250   $10,751,250   $10,751,250

                                       40


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 $3,525,126 in 286  transactions and
sold shares, the proceeds of which totaled $3,393,270, in 264 transactions.  The
net  gain  on  these  sales  was  $650,848.   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                     223              $5,869,785

Fidelity Retirement Growth Fund                 216              $7,378,990

Fidelity Asset Manager Income Fund               86                $213,132

Fidelity Asset Manager Growth Fund              148              $1,338,823

Fidelity Asset Manager Fund                     158              $1,625,100

Fidelity International Growth and
Income Fund                                     120                $324,653

Fidelity Managed Income Portfolio
Fund                                            174              $4,914,087

Fidelity US Equity Index
Commingled Pool                                 154              $1,904,825

Founders Growth Fund                            123                $845,486

USAA International Fund                          81                $212,858

Warburg Pincus Emerging Growth                  104                $296,104

Fidelity Brokerage Link                          58                $454,237

Cash Portfolio                                  146              $4,308,151


                                       41


     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/(Loss)

Fidelity Equity Income Fund               198      $5,643,348       $995,583

Fidelity Retirement Growth
Fund                                      188      $3,597,324       $198,313

Fidelity Asset Manager Income
Fund                                       36        $151,426         $5,331

Fidelity Asset Manager Growth
Fund                                       99        $666,176       $108,086

Fidelity Asset Manager Fund               126        $606,253        $79,305

Fidelity International Growth
and Income Fund                            86        $366,732        $36,177

Fidelity Managed Income
Portfolio Fund                            187      $3,788,166             $0

Fidelity US Equity Index
Commingled Pool                            77        $765,429        $42,481

Founders Growth Fund                       52        $255,992         $7,561

USAA International Fund                    26        $105,042        ($7,608)

Warburg Pincus Emerging Growth             35         $92,226        ($1,449)

Fidelity Brokerage Link                   252        $103,579             $0

Cash Portfolio                            211      $4,215,173             $0


                                       42


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


                                                             Item 27a Schedule I

                             Illinois Power Company
                             Incentive Savings Plan
                          for Employees Covered Under a
                         Collective Bargaining Agreement

                 Schedule of Assets Held for Investment Purposes
                                December 31, 1998


Identity of Issue/                                                 Current
Description of Investment                       Cost                Value

*Illinova Common Stock                       $19,405,395         $23,325,275

*Fidelity Equity Income Fund                 $17,266,208         $24,282,284

*Fidelity Retirement Growth Fund             $25,539,827         $29,002,482

*Fidelity Asset Manager Income Fund             $498,402            $519,921

*Fidelity Asset Manager Growth Fund           $3,682,573          $4,135,718

*Fidelity Asset Manager Fund                  $4,461,886          $4,746,452

*Fidelity International Growth and
Income Fund                                   $1,365,092          $1,515,820

*Fidelity Managed Income Portfolio
Fund                                         $11,877,171         $11,877,172

*Fidelity US Equity Index
Commingled Pool                               $2,521,443          $3,190,596

*Founders Growth Fund                         $1,172,193          $1,255,200

*USAA International Fund                        $287,828            $268,976

*Warburg Pincus Emerging Growth                 $524,811            $558,770

*Fidelity Brokerage Link                        $866,805            $866,805

*Participant Loans**                          $3,447,568          $3,447,568
                                              ----------         -----------
                                             $92,917,202        $108,993,039


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





                                                                                                               Item 27d Schedule II


                                                        Illinois Power Company
                                                        Incentive Savings Plan
                                                     for Employees Covered Under a
                                                    Collective Bargaining Agreement

                                                 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
- --------------------                     ----------   ----------   ------     --------    ----------     ----------     ----------

                                                                                                   
Illinova Common Stock                    $3,525,126   $3,393,270    N/A          N/A      $2,742,422     $3,393,270     $  650,848

Fidelity Equity
Income Fund
                                         $5,869,785   $5,643,349    N/A          N/A      $4,647,766     $5,643,349     $  995,583

Fidelity Retirement
Growth Fund
                                         $7,378,990   $3,597,324    N/A          N/A      $3,399,011     $3,597,324     $  198,313

Fidelity Managed
Income Portfolio Fund
                                         $4,914,087   $3,788,166    N/A          N/A      $3,788,166     $3,788,166              0



* 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.



     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
                                                 for Employees Covered Under a
                                                 Collective Bargaining Agreement


                                                 by: /s/Kim B. Leftwich
                                                 Kim B. Leftwich
                                                 Vice-President

        Date: June 28, 1999





                                  EXHIBIT INDEX

                             Exhibits Filed Herewith


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

                 1               Consent of Independent Accountants






                                                                       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  Employees  Covered  Under a  Collective  Bargaining
Agreement for the year ended December 31, 1998, which appears in this Form 11-K.






by /s/PricewaterhouseCoopers LLP

St. Louis, Missouri
June 28, 1999