ILLINOIS POWER CO
11-K, 1998-06-18
ELECTRIC & OTHER SERVICES COMBINED
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                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                    FORM 11-K

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

                   For the fiscal year ended December 31, 1997

                          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.)



<PAGE>


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



                              FINANCIAL STATEMENTS
                           AND ADDITIONAL INFORMATION




                                DECEMBER 31, 1997



<PAGE>


                             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, 1997 and 1996                                          2-14

        Statements  of Changes in Net Assets  Available
        for Benefits  with Fund Information for the
        years ended December 31, 1997 and 1996                             15-28

        Notes to Financial Statements                                      29-37

Additional Information:

       Schedule I - Schedule of Assets Held for Investment Purposes

       Schedule II - Schedule of Reportable Transactions



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

<PAGE>


ILLINOIS POWER COMPANY
INCENTIVE SAVINGS PLAN 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


<PAGE>




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

<PAGE>










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



<PAGE>







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


<PAGE>









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            
                                               Managed            US Equity
                                              Income               Index
                                              Portfolio          Commingled
                                                Fund                Pool
                                                                                
   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



<PAGE>







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



<PAGE>









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



<PAGE>








ILLINOIS POWER COMPANY
INCENTIVE SAVINGS PLAN



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

                                                Total All
                                                  Funds
ASSETS:
   Cash and Temporary Cash Investments          $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



<PAGE>










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, 1996

                                                                  Fidelity 
                                                Illinova           Equity       
                                                 Stock             Income
                                                 Fund               Fund
ASSETS:
   Cash and Temporary Cash Investments           $251,748                $0
   Investments at Fair Value                   22,811,497        16,154,296
                                              -----------       -----------
       Total Investments                       23,063,245        16,154,296

   Dividends and Interest Receivable                1,119                 0
   Employee Contributions Receivable                3,456            73,280
   Employer Contributions Receivable            1,264,346                 0
   Loan Repayments Receivable                       1,114            20,216
   Loans Outstanding                                    0                 0
                                              -----------       -----------
       Other Assets                             1,270,035            93,496
                                              -----------       -----------
   Total Assets                                24,333,280        16,247,792
                                              -----------       -----------

LIABILITIES:
   Accrued Expenses                                66,855                 0
                                              -----------       -----------
   Total Liabilities                               66,855                 0
                                              -----------       -----------
NET ASSETS AVAILABLE FOR BENEFITS             $24,266,425       $16,247,792
                                              ===========       ===========

See Accompanying Notes to Financial Statements





<PAGE>






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, 1996

                                               Fidelity
                                              Retirement
                                               Growth                Loan
                                                Fund                 Fund
                                                                 
ASSETS:
   Cash and Temporary Cash Investments                 $0               $0
   Investments at Fair Value                   18,349,277                0
                                              -----------       ----------
       Total Investments                       18,349,277                0

   Dividends and Interest Receivable                    0                0
   Employee Contributions Receivable               82,578                0
   Employer Contributions Receivable                    0                0
   Loan Repayments Receivable                      21,323         (60,935)
   Loans Outstanding                                    0        2,805,579
                                              -----------       ----------
       Other Assets                               103,901        2,744,644
                                              -----------       ----------
   Total Assets                                18,453,178        2,744,644
                                              -----------       ----------

LIABILITIES:
   Accrued Expenses                                     0                0
                                              -----------       ----------
   Total Liabilities                                    0                0
                                              -----------       ----------
NET ASSETS AVAILABLE FOR BENEFITS             $18,453,178       $2,744,644
                                              ===========       ==========


See Accompanying Notes to Financial Statements




<PAGE>







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, 1996

                                              Fidelity              Fidelity
                                               Asset                  Asset
                                              Manager               Manager
                                              Income                 Growth
                                               Fund                   Fund
ASSETS:
   Cash and Temporary Cash Investments             $0                   $0
   Investments at Fair Value                  302,753            2,397,751
                                             --------           ----------
       Total Investments                      302,753            2,397,751

   Dividends and Interest Receivable                0                    0
   Employee Contributions Receivable            2,503               14,476
   Employer Contributions Receivable                0                    0
   Loan Repayments Receivable                     403                2,383
   Loans Outstanding                                0                    0
                                             --------           ----------
       Other Assets                             2,906               16,859
                                             --------           ----------
   Total Assets                               305,659            2,414,610
                                             --------           ----------

LIABILITIES:
   Accrued Expenses                                 0                    0
                                             --------           ----------
   Total Liabilities                                0                    0
                                             --------           ----------
NET ASSETS AVAILABLE FOR BENEFITS            $305,659           $2,414,610
                                             ========           ==========


See Accompanying Notes to Financial Statements




<PAGE>






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, 1996

                                               Fidelity           Fidelity
                                                Asset            International
                                                Manager           Growth and
                                                 Fund             Income Fund
ASSETS:
   Cash and Temporary Cash Investments               $0                 $0
   Investments at Fair Value                  3,438,571          1,469,320
                                             ----------         ----------
       Total Investments                      3,438,571          1,469,320

   Dividends and Interest Receivable                  0                  0
   Employee Contributions Receivable             16,826             10,094
   Employer Contributions Receivable                  0                  0
   Loan Repayments Receivable                     2,650              2,458
   Loans Outstanding                                  0                  0
                                             ----------         ----------
       Other Assets                              19,476             12,552
                                             ----------         ----------
   Total Assets                               3,458,047          1,481,872
                                             ----------         ----------

LIABILITIES:
   Accrued Expenses                                   0                  0
                                             ----------         ----------
   Total Liabilities                                  0                  0
                                             ----------         ----------
NET ASSETS AVAILABLE FOR BENEFITS            $3,458,047         $1,481,872
                                             ==========         ==========


See Accompanying Notes to Financial Statements




<PAGE>







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, 1996

                                              Fidelity
                                               Managed
                                               Income
                                              Portfolio            Total All
                                                Fund                 Funds
                                                                               
ASSETS:
   Cash and Temporary Cash Investments                $0           $251,748
   Investments at Fair Value                  10,955,488         75,878,953
                                             -----------        -----------
       Total Investments                      10,955,488         76,130,701

   Dividends and Interest Receivable                   0              1,119
   Employee Contributions Receivable              34,734            237,947
   Employer Contributions Receivable                   0          1,264,346
   Loan Repayments Receivable                     10,388                  0
   Loans Outstanding                                   0          2,805,579
                                             -----------        -----------
       Other Assets                               45,122          4,308,991
                                             -----------        -----------
   Total Assets                               11,000,610         80,439,692
                                             -----------        -----------

LIABILITIES:
   Accrued Expenses                                    0             66,855
                                             -----------        -----------
   Total Liabilities                                   0             66,855
                                             -----------        -----------
NET ASSETS AVAILABLE FOR BENEFITS            $11,000,610        $80,372,837
                                             ===========        ===========


See Accompanying Notes to Financial Statements




<PAGE>






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     
                                                Illinova            Equity  
                                                 Stock              Income     
                                                 Fund                Fund
Sources of Participants' Equity:
   Contributions:
         Employee                                $87,490         $1,890,400
         Employer                              1,762,154                  0
Fund-to-Fund Transfers                         (457,237)            741,903
         Plan-to-Plan Transfers                (362,516)          (173,427)
         Loan Repayments                          29,926            396,081
                                             -----------        -----------
                                               1,059,817          2,854,957
                                             -----------        -----------
   Investment Income:
       Dividend and Interest Income            1,092,379          1,233,058
       Net Change in Fair Value of
         Investments                           (422,572)          3,817,687
                                             -----------        -----------
                                                 669,807          5,050,745
                                             -----------        -----------
Application of Participants' Equity:
       Loans to Participants                      31,561            491,906
       Distributions to Active and
         Terminated Participants               1,077,520            756,492
       Administrative and Miscellaneous
         Expenses                                 37,347              6,314
                                             -----------        -----------
                                               1,146,428          1,254,712
                                             -----------        -----------
Increase (Decrease) in Net Assets
   Available for Benefits                        583,196          6,650,990

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


<PAGE>



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
                                                Growth             Loan
                                                 Fund              Fund

Sources of Participants' Equity:
   Contributions:
         Employee                             $1,890,161                 $0
         Employer                                      0                  0
         Fund-to-Fund Transfers              (1,647,064)                  0
         Plan-to-Plan Transfers                (329,329)           (51,768)
         Loan Repayments                         395,922        (1,033,675)
                                             -----------         ----------
                                                 309,690        (1,085,443)
                                             -----------         ----------
   Investment Income:
       Dividend and Interest Income            3,561,464                  0
       Net Change in Fair Value of
         Investments                           (295,168)                  0
                                             -----------         ----------
                                               3,266,296                  0
                                             -----------         ----------
Application of Participants' Equity:
       Loans to Participants                     468,136        (1,537,913)
       Distributions to Active and
         Terminated Participants                 813,814             79,284
       Administrative and Miscellaneous
         Expenses                                  1,597                  0
                                             -----------         ----------
                                               1,283,547        (1,458,629)
                                             -----------         ----------
Increase (Decrease) in Net Assets
   Available for Benefits                      2,292,439            373,186

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


<PAGE>


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               Asset
                                              Manager             Manager
                                              Income              Growth
                                               Fund                Fund
Sources of Participants' Equity:
   Contributions:
         Employee                             $71,810             $369,988
         Employer                                   0                    0
         Fund-to-Fund Transfers                70,609              119,410
         Plan-to-Plan Transfers               (8,078)             (73,516)
         Loan Repayments                        8,867               65,931
                                             --------           ----------
                                              143,208              481,813
                                             --------           ----------
   Investment Income:
       Dividend and Interest Income            27,406              353,126
       Net Change in Fair Value of
         Investments                           14,718              318,629
                                             --------           ----------
                                               42,124              671,755
                                             --------           ----------
Application of Participants' Equity:
       Loans to Participants                    6,753               77,490
       Distributions to Active and
         Terminated Participants               28,056               77,393
       Administrative and Miscellaneous
         Expenses                                 135                   50
                                             --------           ----------
                                               34,944              154,933
                                             --------           ----------
Increase (Decrease) in Net Assets
   Available for Benefits                     150,388              998,635

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


<PAGE>




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             International
                                               Manager             Growth and
                                                Fund              Income Fund
Sources of Participants' Equity:
   Contributions:
         Employee                              $398,097           $220,362
         Employer                                     0                  0
         Fund-to-Fund Transfers               (332,512)          (269,119)
         Plan-to-Plan Transfers                (51,709)              3,351
         Loan Repayments                         61,638             47,613
                                             ----------         ----------
                                                 75,514              2,207
                                             ----------         ----------
   Investment Income:
       Dividend and Interest Income             345,904             87,091
       Net Change in Fair Value of
         Investments                            386,629             17,608
                                             ----------         ----------
                                                732,533            104,699
                                             ----------         ----------
Application of Participants' Equity:
       Loans to Participants                    101,367             53,246
       Distributions to Active and
         Terminated Participants                210,913             56,396
       Administrative and Miscellaneous
         Expenses                                   107                200
                                             ----------         ----------
                                                312,387            109,842
                                             ----------         ----------
Increase (Decrease) in Net Assets
   Available for Benefits                       495,660            (2,936)

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


<PAGE>




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
                                                Managed           US Equity
                                                 Income            Index
                                               Portfolio         Commingled
                                                 Fund               Pool
                                                                                
Sources of Participants' Equity:
   Contributions:
         Employee                              $826,080           $158,523
         Employer                                     0                  0
         Fund-to-Fund Transfers               (792,296)          1,130,697
         Plan-to-Plan Transfers                (79,845)             26,171
         Loan Repayments                        219,925             38,916
                                            -----------         ----------
                                                173,864          1,354,307
                                            -----------         ----------
   Investment Income:
       Dividend and Interest Income             637,128                  0
       Net Change in Fair Value of
         Investments                                  0            115,245
                                            -----------         ----------
                                                637,128            115,245
                                            -----------         ----------
Application of Participants' Equity:
       Loans to Participants                    296,619              6,180
       Distributions to Active and
         Terminated Participants                708,412              4,665
       Administrative and Miscellaneous
         Expenses                                 8,606                  0
                                            -----------         ----------
                                              1,013,637             10,845
                                            -----------         ----------
Increase (Decrease) in Net Assets
   Available for Benefits                     (202,645)          1,458,707

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


<PAGE>




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
         Fund-to-Fund Transfers               453,971            152,428
         Plan-to-Plan Transfers               (3,189)            (1,035)
         Loan Repayments                        8,491              2,816
                                             --------           --------
                                              514,836            176,497
                                             --------           --------
   Investment Income:
       Dividend and Interest Income            70,420             11,742
       Net Change in Fair Value of
         Investments                         (50,169)           (12,725)
                                             --------           --------
                                               20,251              (983)
                                             --------           --------
Application of Participants' Equity:
       Loans to Participants                    2,982                833
       Distributions to Active and
         Terminated Participants                    0                  0
       Administrative and Miscellaneous
         Expenses                                   0                  0
                                             --------           --------
                                                2,982                833
                                             --------           --------
Increase (Decrease) in Net Assets
   Available for Benefits                     532,105            174,681

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



<PAGE>



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
         Fund-to-Fund Transfers               268,869            560,341
         Plan-to-Plan Transfers               (1,375)                  0
         Loan Repayments                        2,154             11,000
                                             --------           --------
                                              305,534            575,162
                                             --------           --------
   Investment Income:
       Dividend and Interest Income            19,181                 33
       Net Change in Fair Value of
         Investments                            4,894                  0
                                             --------           --------
                                               24,075                 33
                                             --------           --------
Application of Participants' Equity:
       Loans to Participants                      840                  0
       Distributions to Active and
         Terminated Participants                    0                  0
       Administrative and Miscellaneous
         Expenses                                   0             57,920
                                             --------           --------
                                                  840             57,920
                                             --------           --------
Increase (Decrease) in Net Assets
   Available for Benefits                     328,769            517,275

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


<PAGE>



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
         Fund-to-Fund Transfers                            0
         Plan-to-Plan Transfers                  (1,106,265)
         Loan Repayments                             255,605
                                                 -----------
                                                   6,941,963
                                                 -----------
   Investment Income:
       Dividend and Interest Income                7,438,932
       Net Change in Fair Value of
         Investments                               3,894,776
                                                 -----------
                                                  11,333,708
                                                 -----------
Application of Participants' Equity:
       Loans to Participants                               0
       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                         14,350,450

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



<PAGE>




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, 1996

                                                Guaranteed          Illinova
                                                Investment            Stock     
                                                  Fund                Fund
                                                                                
Sources of Participants' Equity:
   Contributions:
         Employee                                     $0            $90,279
         Employer                                      0          2,382,672
Fund-to-Fund Transfers                       (2,981,245)          (848,173)
         Plan-to-Plan Transfers                  (8,632)          (240,896)
         Loan Repayments                               0             26,373
                                              ----------        -----------
                                             (2,989,877)          1,410,255
                                              ----------        -----------
   Investment Income:
       Dividend and Interest Income               70,766            948,221
       Net Change in Fair Value of
         Investments                                   0        (2,217,798)
                                              ----------        -----------
                                                  70,766        (1,269,577)
                                              ----------        -----------
Application of Participants' Equity:
       Loans to Participants                      38,495             50,774
       Distributions to Active and
         Terminated Participants                 411,319          2,894,763
       Administrative and Miscellaneous
         Expenses                                      0             28,186
                                              ----------        -----------
                                                 449,814          2,973,723
                                              ----------        -----------
Increase (Decrease) in Net Assets
   Available for Benefits                    (3,368,925)        (2,833,045)

Net Assets Available for Benefits,
   Beginning of Year                           3,368,925         27,099,470
                                              ----------        -----------
Net Assets Available for Benefits,
   End of Year                                        $0        $24,266,425
                                              ==========        ===========

See Accompanying Notes to Financial Statements


<PAGE>



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, 1996

                                                Fidelity           Fidelity
                                                 Equity           Retirement
                                                 Income             Growth
                                                  Fund               Fund
                                                                                
Sources of Participants' Equity:
   Contributions:
         Employee                             $1,611,289         $1,998,396
         Employer                                      0                  0
         Fund-to-Fund Transfers                  957,251          (146,654)
         Plan-to-Plan Transfers                (196,008)          (131,997)
         Loan Repayments                         304,888            437,071
                                             -----------        -----------
                                               2,677,420          2,156,816
                                             -----------        -----------
   Investment Income:
       Dividend and Interest Income              998,419          2,251,091
       Net Change in Fair Value of
         Investments                           1,641,238          (850,496)
                                             -----------        -----------
                                               2,639,657          1,400,595
                                             -----------        -----------
Application of Participants' Equity:
       Loans to Participants                     435,167            625,882
       Distributions to Active and
         Terminated Participants               1,353,351          1,538,229
       Administrative and Miscellaneous
         Expenses                                  5,076              1,362
                                             -----------        -----------
                                               1,793,594          2,165,473
                                             -----------        -----------
Increase (Decrease) in Net Assets
   Available for Benefits                      3,523,483          1,391,938

Net Assets Available for Benefits,
   Beginning of Year                          12,724,309         17,061,240
                                             -----------        -----------
Net Assets Available for Benefits,
   End of Year                               $16,247,792        $18,453,178
                                             ===========        ===========

See Accompanying Notes to Financial Statements


<PAGE>




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, 1996

                                                                   Fidelity     
                                                                     Asset      
                                                                    Manager 
                                                  Loan              Income
                                                  Fund                Fund
Sources of Participants' Equity:
   Contributions:
         Employee                                     $0         $60,867
         Employer                                      0               0
         Fund-to-Fund Transfers                        0          18,713
         Plan-to-Plan Transfers                 (34,288)         (1,766)
         Loan Repayments                       (917,816)           7,933
                                              ----------        --------
                                               (952,104)          85,747
                                              ----------        --------
   Investment Income:
       Dividend and Interest Income                    0          20,552
       Net Change in Fair Value of
         Investments                                   0             367
                                              ----------        --------
                                                       0          20,919
                                              ----------        --------
Application of Participants' Equity:
       Loans to Participants                 (1,631,328)           6,598
       Distributions to Active and
         Terminated Participants                 191,924          67,933
       Administrative and Miscellaneous
         Expenses                                     56               0
                                              ----------        --------
                                             (1,439,348)          74,531
                                              ----------        --------
Increase (Decrease) in Net Assets
   Available for Benefits                        487,244          32,135

Net Assets Available for Benefits,
   Beginning of Year                           2,257,400         273,524
                                              ----------        --------
Net Assets Available for Benefits,
   End of Year                                $2,744,644        $305,659
                                              ==========        ========

See Accompanying Notes to Financial Statements


<PAGE>




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, 1996

                                               Fidelity
                                                Asset             Fidelity
                                                Manager             Asset
                                                Growth             Manager
                                                 Fund               Fund
Sources of Participants' Equity:
   Contributions:
         Employee                              $331,775           $407,265
         Employer                                     0                  0
         Fund-to-Fund Transfers                 135,815          (118,016)
         Plan-to-Plan Transfers                (45,836)           (50,856)
         Loan Repayments                         47,568             54,051
                                             ----------         ----------
                                                469,322            292,444
                                             ----------         ----------
   Investment Income:
       Dividend and Interest Income             196,481            266,963
       Net Change in Fair Value of
         Investments                            140,898            117,051
                                             ----------         ----------
                                                337,379            384,014
                                             ----------         ----------
Application of Participants' Equity:
       Loans to Participants                     54,214             75,020
       Distributions to Active and
         Terminated Participants                209,046            456,167
       Administrative and Miscellaneous
         Expenses                                    46                 85
                                             ----------         ----------
                                                263,306            531,272
                                             ----------         ----------
Increase (Decrease) in Net Assets
   Available for Benefits                       543,395            145,186

Net Assets Available for Benefits,
   Beginning of Year                          1,871,215          3,312,861
                                             ----------         ----------
Net Assets Available for Benefits,
   End of Year                               $2,414,610         $3,458,047
                                             ==========         ==========

See Accompanying Notes to Financial Statements



<PAGE>




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, 1996

                                                                   Fidelity     
                                                 Fidelity          Managed
                                               International        Income
                                                 Growth and       Portfolio
                                                 Income Fund         Fund
Sources of Participants' Equity:
   Contributions:
         Employee                              $238,051            $854,699
         Employer                                     0                   0
         Fund-to-Fund Transfers                   4,543           2,977,766
         Plan-to-Plan Transfers                (59,534)            (69,683)
         Loan Repayments                         45,934             209,433
                                             ----------         -----------
                                                228,994           3,972,215
                                             ----------         -----------
   Investment Income:
       Dividend and Interest Income              45,771             548,224
       Net Change in Fair Value of
         Investments                            106,229                   0
                                             ----------         -----------
                                                152,000             548,224
                                             ----------         -----------
Application of Participants' Equity:
       Loans to Participants                     43,343             301,835
       Distributions to Active and
         Terminated Participants                102,845           2,055,631
       Administrative and Miscellaneous
         Expenses                                   131               8,592
                                             ----------         -----------
                                                146,319           2,366,058
                                             ----------          ----------
Increase (Decrease) in Net Assets
   Available for Benefits                       234,675           2,154,381

Net Assets Available for Benefits,
   Beginning of Year                          1,247,197           8,846,229
                                             ----------         -----------
Net Assets Available for Benefits,
   End of Year                               $1,481,872         $11,000,610
                                             ==========         ===========

See Accompanying Notes to Financial Statements


<PAGE>




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, 1996

                                                 Total All
                                                   Funds
Sources of Participants' Equity:
   Contributions:
         Employee                                $5,592,621
         Employer                                 2,382,672
         Fund-to-Fund Transfers                           0
         Plan-to-Plan Transfers                   (839,496)
         Loan Repayments                            215,435
                                                -----------
                                                  7,351,232
                                                -----------
   Investment Income:
       Dividend and Interest Income               5,346,488
       Net Change in Fair Value of
         Investments                            (1,062,511)
                                                -----------
                                                  4,283,977
                                                -----------
Application of Participants' Equity:
       Loans to Participants                              0
       Distributions to Active and
         Terminated Participants                  9,281,208
       Administrative and Miscellaneous
         Expenses                                    43,534
                                                -----------
                                                  9,324,742
                                                -----------
Increase (Decrease) in Net Assets
   Available for Benefits                         2,310,467

Net Assets Available for Benefits,
   Beginning of Year                             78,062,370
                                                -----------
Net Assets Available for Benefits,
   End of Year                                  $80,372,837
                                                ===========

See Accompanying Notes to Financial Statements

<PAGE>




                             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:

       As of June 30, 1994, the administrator started phasing out the Guaranteed
Investment  Contract (GIC) option.  No funds were  contributed or transferred to
the GIC after  that  date.  Funds in the  guaranteed  investment  contract  were
eligible to remain there until June 30, 1996, at which time the contract matured
and the remaining funds were transferred to the Managed Income Portfolio.

<PAGE>

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

       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  between  plans as  participants  change  jobs.  These
transfers  are shown in the  Statement  of Changes in Net Assets  Available  for
Benefits with Fund Information as Plan-to-Plan Transfers.

<PAGE>


       The Company contributes a monthly matching contribution to the Plan equal
to 50% of the first $80 of the participants'  monthly  before-tax  contributions
and 25% of the balance of deferrals per month,  up to 6% of the employee's  base
earnings for the month. All Company matching  contributions are paid in units of
Illinova  common stock and are  contained in the Stock Fund.  Dividends on stock
held in the Stock Fund are also invested in the Stock Fund.

       The  Company  has an  Incentive  Compensation  arrangement  in which  all
employees can 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, 1997,  290,675 and 340,566  shares have been allocated
to bargaining  unit  employees  for Company  Match and  Incentive  Compensation,
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.

<PAGE>


       Forfeitures:

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

       Loans:

       The Plan allows  participants to borrow from their  before-tax and TRASOP
accounts an amount not to exceed the lesser of $50,000  reduced by the excess of
the highest  outstanding  balance of loans during the one-year period before the
date the loan is made over the outstanding balance of loans on the date the loan
is made or 50% of the vested account balance. Interest is charged on these loans
at a rate commensurate with interest rates charged by persons in the business of
lending money for similar type loans.  For 1997 and 1996,  the interest rate was
9.50% and 9.25%, respectively.

       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.


<PAGE>


NOTE 2 - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES:

       Basis of Accounting:

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

       Investments:

       The guaranteed investment fund is valued at contract value as reported to
the Plan by the Trustee.  Participant notes receivable included in the loan fund
are valued at cost, which  approximates fair value. Other investments are stated
at current value based on the latest quoted market price.

       Income:

       Interest and dividend income is accrued as earned.

       Net appreciation  (depreciation)  of investments is comprised of realized
and  unrealized  gains  and  losses.  Realized  gains or  losses  represent  the
difference  between  proceeds  received  upon sale and the  average  cost of the
investment.  Unrealized gain or loss is the difference  between market value and
cost of investments  retained in the Plan (at financial statement date). For the
purpose of allocation to  participants,  the Illinova  common stock is valued by
the  Plan at  actual  cost;  however,  current  value  is  used  at the  time of
distribution to participants and results 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.

<PAGE>


       Use of Estimates:

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


<PAGE>


NOTE 3 - INVESTMENTS

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

                                                    December 31, 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



                                                    December 31, 1996

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

Illinova Common Stock                    829,509     $22,811,497     $18,146,391

Fidelity Equity Income
Fund                                     377,172     $16,154,296     $12,638,120

Fidelity Retirement
Growth Fund                            1,061,265     $18,349,277     $18,759,454

Fidelity Managed Income
Portfolio Fund                        10,955,488     $10,955,488     $10,955,488


<PAGE>


NOTE 4 - TRANSACTIONS WITH PARTIES-IN-INTEREST

     Fidelity  Management  Trust  Company,  the Trustee for the Plan,  purchased
shares of Illinova Common Stock at a cost of $2,725,418 in 296  transactions and
sold shares, the proceeds of which totaled $2,160,029, in 286 transactions.  The
net  gain  on  these  sales  was  $168,345.   The   transactions  are  allowable
party-in-interest transactions under Section 408(3) of ERISA and the regulations
thereunder.

     The majority of the assets of the Plan are invested in Fidelity Investments
mutual  funds.  The Plan also  invests in a short-term  money  market fund,  the
Fidelity Investments Cash Portfolio.  The transactions with these Fidelity funds
are allowable  party-in-interest  transactions  under Section 408(b)(8) of ERISA
and the regulations  thereunder.  The number of purchase  transactions with each
fund and the dollar  amount of  purchases  for each fund as of December 31, 1997
are listed below:

                                                   Purchase         Purchase
Fund                                             Transactions        Amount

Fidelity Equity Income Fund                           223          $5,265,201

Fidelity Retirement Growth Fund                       221          $6,196,075

Fidelity Asset Manager Income Fund                     91          $  209,091

Fidelity Asset Manager Growth Fund                    147          $1,180,149

Fidelity Asset Manager Fund                           165          $  872,657

Fidelity International Growth and
Income Fund                                           140          $  426,978

Fidelity Managed Income Portfolio
Fund                                                  171          $2,703,562

Fidelity US Equity Index
Commingled Pool                                       117          $1,499,919

Founders Growth Fund                                   90          $  635,451

USAA International Fund                                68          $  228,209

Warburg Pincus Emerging Growth                         73          $  363,917

Fidelity Brokerage Link                                36          $  624,451

Cash Portfolio                                        137          $2,684,825



<PAGE>


     The  number of sales  transactions  with each fund,  the  dollar  amount of
sales,  and the gain on these  sales for each fund as of  December  31, 1997 are
shown below:

                                            Sales
                                            Trans-       Sales
Fund                                       actions       Amount      Gain/(Loss)

Fidelity Equity Income Fund                  190       2,443,380        $584,247

Fidelity Retirement Growth
Fund                                         211      $3,607,142        $211,462

Fidelity Asset Manager Income
Fund                                          38      $   73,372        $  3,720

Fidelity Asset Manager Growth
Fund                                         101      $  503,896        $ 91,221

Fidelity Asset Manager Fund                  141      $  767,836        $106,706

Fidelity International Growth
and Income Fund                              103      $  446,507        $ 51,994

Fidelity Managed Income 
Portfolio Fund                               197      $2,907,799               0

Fidelity US Equity Index
Commingled Pool                               22      $  172,558        $ 12,204

Founders Growth Fund                          13      $   59,856       $   (458)

USAA International Fund                       10      $   42,584        $  1,994

Warburg Pincus Emerging
Growth                                         9      $   42,809        $  1,274

Fidelity Brokerage Link                      166      $  108,304               0

Cash Portfolio                               231      $2,711,433               0



<PAGE>


                                                             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, 1997


Identity of Issue/                                                   Current
Description of Investment                           Cost              Value

*Illinova Common Stock                          $18,813,033       $23,978,597

*Fidelity Equity Income Fund                     16,044,188        22,793,804

*Fidelity Retirement Growth Fund                 21,559,849        20,643,042

*Fidelity Asset Manager Income Fund                 431,365           453,190

*Fidelity Asset Manager Growth Fund               2,901,840         3,392,633

*Fidelity Asset Manager Fund                      3,363,735         3,930,020

*Fidelity International Growth and
 Income Fund                                      1,370,994         1,467,400

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

*Fidelity US Equity Index
 Commingled Pool                                  1,339,565         1,442,606

*Founders Growth Fund                               575,137           525,426

*USAA International Fund                            187,619           172,900

*Warburg Pincus Emerging Growth                     322,382           326,002

*Fidelity Brokerage Link                            590,961           516,147

**Participant Loans                               3,178,759         3,178,759
                                                  ---------         ---------

                                                $81,430,677       $93,571,776
                                                ===========       ===========

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


<PAGE>




<TABLE>
                                                                                                                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, 1997


                                                                                                           
                                                                             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

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

Illinova Common Stock           $2,725,418      $2,160,029       N/A            N/A         $1,991,684      $2,160,029      $168,345

Fidelity Equity
Income Fund                     $5,265,201      $2,443,380       N/A            N/A         $1,859,133      $2,443,380      $584,247

Fidelity Retirement
Growth Fund                     $6,196,075      $3,607,142       N/A            N/A         $3,395,680      $3,607,142      $211,462

Fidelity Managed
Income Portfolio Fund           $2,703,562      $2,907,799       N/A            N/A         $2,907,799      $2,907,799             0


* Transactions or series of transactions in excess of 5% of the current value of
the Plan's  assets as of December 31, 1996 as defined in Section  2520.103-6  of
the Department of Labor Rules and Regulations for Reporting and Disclosure under
ERISA.

</TABLE>







<PAGE>


     SIGNATURE


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


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


                                                 by /S/ Kim B. Leftwich
                                                 Kim B. Leftwich
                                                 Vice-President

        Date: June 17, 1998


<PAGE>




                                  EXHIBIT INDEX

                             Exhibits Filed Herewith




            Exhibit No.                    Description

                 1                         Consent of Independent Accountants



<PAGE>
                                                                       Exhibit 1

                       CONSENT OF INDEPENDENT ACCOUNTANTS



We  hereby  consent  to the  incorporation  by  reference  in  the  Registration
Statement on Form S-8 (No. 33-60278 of Illinova Corporation of our report on the
Illinois  Power Company  Incentive  Savings Plan for  Employees  Covered Under a
Collective Bargaining Agreement for the year ended December 31, 1997, dated June
12, 1998, which is incorporated by reference in this Form 11-K.






by /s/ Price Waterhouse LLP

St. Louis, Missouri
June 12, 1998

<PAGE>




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