UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D. C. 20549


                                    Form 10-Q

              (X) QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d)
                     OF THE SECURITIES EXCHANGE ACT OF 1934

                  For the quarterly period ended June 30, 1999

                                       OR
              ( ) TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d)
                     OF THE SECURITIES EXCHANGE ACT OF 1934

             For the transition period from __________to __________

Commission      Registrants; State of Incorporation;        IRS Employer
File Number      Address; and Telephone Number             Identification No.

   1-11327          Illinova Corporation                      37-1319890
                    (an Illinois Corporation)
                    500 S. 27th Street
                    Decatur, IL  62521
                    (217) 424-6600

   1-3004           Illinois Power Company                    37-0344645
                    (an Illinois Corporation)
                    500 S. 27th Street
                    Decatur, IL  62521
                    (217) 424-6600

         Indicate  by check  mark  whether  the  registrants  (1) have filed all
reports  required to be filed by Section 13 or 15(d) of the Securities  Exchange
Act of 1934 during the preceding 12 months (or for such shorter  period that the
registrant was required to file such report),  and (2) have been subject to such
filing requirements for the past 90 days.

                             Illinova        Yes  X       No
                             Corporation        ----        ----

                             Illinois Power  Yes  X       No
                             Company            ----        ----

         Indicate  the  number of  shares  outstanding  of each of the  issuers'
classes of common stock, as of the latest practicable date:

Illinova Corporation          Common stock, no par value, 69,919,287
                              shares outstanding at June 30, 1999

Illinois Power Company        Common stock, no par value,
                              62,892,213  shares  outstanding  held by  Illinova
                              Corporation at June 30, 1999





                              ILLINOVA CORPORATION
                             ILLINOIS POWER COMPANY

This combined Form 10-Q is separately filed by Illinova Corporation and Illinois
Power Company.  Information  contained herein relating to Illinois Power Company
is filed by Illinova Corporation and separately by Illinois Power Company on its
own behalf.  Illinois  Power Company makes no  representation  as to information
relating to Illinova Corporation or its subsidiaries, except as it may relate to
Illinois Power Company.

                  FORM 10-Q FOR THE QUARTER ENDED June 30, 1999
                                      INDEX
                                                                     PAGE NO.
Part I.  FINANCIAL INFORMATION

   Item 1:  Financial Statements

            Illinova Corporation

                 Consolidated Balance Sheets                         3 - 4
                 Consolidated Statements of Income                       5
                 Consolidated Statements of Comprehensive Income         6
                 Consolidated Statements of Cash Flows                   7

            Illinois Power Company

                 Consolidated Balance Sheets                         8 - 9
                 Consolidated Statements of Income                      10
                 Consolidated Statements of Comprehensive Income        11
                 Consolidated Statements of Cash Flows                  12

            Notes to Consolidated Financial Statements of
                 Illinova Corporation and
                 Illinois Power Company                            13 - 31

   Item 2:  Management's Discussion and Analysis of
                 Financial Condition and Results of
                 Operations for Illinova Corporation
                 and Illinois Power Company                        32 - 52

   Item 3:  Quantitative and Qualitative Disclosures
                 About Market Risk                                 53 - 55

Part II.  OTHER INFORMATION

   Item 6:  Exhibits and Reports on Form 8-K                            56

   Signatures                                                      57 - 58

   Exhibit Index                                                        59

                                       2




                          PART I. FINANCIAL INFORMATION
                                                              ILLINOVA CORPORATION
                                                        CONSOLIDATED BALANCE SHEETS
          (See accompanying Notes to Consolidated Financial Statements)

                                                                                    JUNE 30,             DECEMBER 31,
                                                                                    1999                     1998
ASSETS                                                                            (Unaudited)             (Audited)
                                                                                          (Millions of Dollars)
                                                                                               
Utility Plant
    Electric (includes construction work
          in progress of $154.6 million and
          $177.7 million, respectively)                                            $5,584.1             $5,481.8
    Gas (includes construction work
          in progress of $13.2 million and
          $15.3 million, respectively)                                                693.7                686.9
                                                                                   --------             --------
                                                                                    6,277.8              6,168.7
Less - Accumulated depreciation                                                     1,756.4              1,713.7
                                                                                   --------             --------
                                                                                    4,521.4              4,455.0
Nuclear fuel                                                                           15.5                 20.3
                                                                                   --------             --------
       Total utility plant                                                          4,536.9              4,475.3
                                                                                   --------             --------
Investments and Other Assets                                                          265.9                246.9
                                                                                   --------             --------
Current Assets
    Cash and cash equivalents                                                          35.4                518.1
    Accounts receivable (less allowance
     for doubtful accounts of $5.5 million)
       Service                                                                        123.4                105.9
       Other                                                                          129.8                116.1
    Accrued unbilled revenue                                                           70.7                 82.6
    Materials and supplies, at average cost                                            80.8                 90.8
    Assets from commodity price risk
       management activities                                                           58.3                 51.5
    Prepayments and other                                                              58.2                 51.5
                                                                                   --------             --------
       Total current assets                                                           556.6              1,016.5
                                                                                   --------             --------
Deferred Charges
    Transition period cost recovery                                                   778.1                783.0
    Other                                                                             317.9                279.6
                                                                                   --------             --------
       Total deferred charges                                                       1,096.0              1,062.6
                                                                                   --------             --------
                                                                                   $6,455.4             $6,801.3
                                                                                   ========             ========


                                       3



                                                           ILLINOVA CORPORATION
                                                        CONSOLIDATED BALANCE SHEETS
                                       (See accompanying Notes to Consolidated Financial Statements)

                                                                                   JUNE 30,     DECEMBER 31,
                                                                                     1999          1998
CAPITAL AND LIABILITIES                                                          (Unaudited)    (Audited)
                                                                                     (Millions of Dollars)
Capitalization
    Common stock -
       No par value, 200,000,000 shares authorized;
                                                                                         
       75,681,937 shares issued, stated at                                        $1,319.8        $1,319.7
    Less - Deferred compensation - ESOP                                                3.8             6.8
    Retained deficit - accumulated since 1/1/99                                      (17.1)            -
    Accumulated other comprehensive income                                             1.8             -
    Less - Capital stock expense                                                       7.3             7.3
    Less - 5,762,650 shares of common stock
       in treasury, at cost                                                          138.7           138.7
                                                                                  --------        --------
          Total common stock equity                                                1,154.7         1,166.9

    Preferred stock of subsidiary                                                     50.4            57.1
    Company obligated mandatorily redeemable
       preferred stock of subsidiary                                                 194.0           199.0
    Long-term debt                                                                   175.4           176.1
    Long-term debt of subsidiary                                                   2,137.2         2,158.5
                                                                                  --------        --------
          Total capitalization                                                     3,711.7         3,757.6
                                                                                  --------        --------

Current Liabilities
    Accounts payable                                                                 232.6           256.5
    Notes payable                                                                    122.0           147.6
    Long-term debt and lease obligations
       of subsidiary maturing within one year                                        287.1           506.6
    Liabilities from commodity price
       risk management activities                                                    100.0            99.8
    Other                                                                            219.1           203.8
                                                                                  --------        --------
          Total current liabilities                                                  960.8         1,214.3
                                                                                  --------        --------
Deferred Credits
    Accumulated deferred income taxes                                                961.4           964.0
    Accumulated deferred investment tax credits                                       38.8            39.6
    Decommissioning liability                                                        528.5           567.4
    Other                                                                            254.2           258.4
                                                                                  --------        --------
          Total deferred credits                                                   1,782.9         1,829.4
                                                                                  --------        --------
                                                                                  $6,455.4        $6,801.3
                                                                                  ========        ========


                                       4



                                                       ILLINOVA CORPORATION
                                                 CONSOLIDATED STATEMENTS OF INCOME
                                   (See accompanying Notes to Consolidated Financial Statements)

                                                                    THREE MONTHS ENDED                        SIX MONTHS ENDED
                                                                         JUNE 30,                                 JUNE 30,
                                                                  1999               1998                 1999               1998
                                                                                           (Unaudited)
                                                                                     (Millions except per share)
Operating Revenues:
                                                                                                               
     Electric                                                    $276.7              $304.5            $  531.9            $  581.1
     Electric interchange                                          56.2               112.7               150.2               209.0
     Gas                                                           45.2                49.8               168.3               166.4
     Diversified enterprises                                      101.2                80.3               177.3               166.2
                                                                 ------              ------            --------            --------
         Total                                                    479.3               547.3             1,027.7             1,122.7
                                                                 ------              ------            --------            --------

Operating Expenses:
     Fuel for electric plants                                      60.0                53.9               111.4               109.6
     Power purchased                                               46.7               229.4                98.4               326.5
     Gas purchased for resale                                      17.0                22.4                89.5                88.4
     Diversified enterprises                                      114.5                85.0               196.0               179.7
     Other operating expenses                                      81.0                87.9               191.4               167.7
     Maintenance                                                   26.1                35.0                67.4                64.0
     Depreciation and amortization                                 44.9                50.5                89.4               101.2
     Amortization of regulatory asset                               6.2                 -                   7.7                   -
     General taxes                                                 22.9                34.3                52.8                73.0
                                                                 ------              ------            --------            --------
         Total                                                    419.3               598.4               904.0             1,110.1
                                                                 ------              ------            --------            --------
Operating Income (Loss)                                            60.0               (51.1)              123.7                12.6
                                                                 ------              ------            --------            --------
Other Income and Deductions:
     Miscellaneous-net                                              6.3                 2.8                17.2                 1.3
     Equity earnings in affiliates                                  2.9                 3.4                 3.4                 8.9
                                                                 ------              ------            --------            --------
         Total                                                      9.2                 6.2                20.6                10.2
                                                                 ------              ------            --------            --------
Income (Loss) Before Interest
     Charges and Income Taxes                                      69.2               (44.9)              144.3                22.8
                                                                 ------              ------            --------            --------
Interest Charges:
     Interest expense                                              46.8                35.9                89.9                72.5
     Allowance for borrowed funds
         used during construction                                  (2.0)               (1.2)               (3.2)               (2.3)
     Preferred dividend
         requirements of subsidiary                                 4.7                 5.0                 9.7                 9.9
                                                                 ------              ------            --------            --------
         Total                                                     49.5                39.7                96.4                80.1
                                                                 ------              ------            --------            --------
Income (Loss) Before Income Taxes                                  19.7               (84.6)               47.9               (57.3)
                                                                 ------              ------            --------            --------
Income Taxes                                                       10.7               (37.6)               22.0               (33.3)
                                                                 ------              ------            --------            --------
Net Income (Loss)                                                   9.0               (47.0)               25.9               (24.0)
     Carrying amount (under) over
         consideration paid for redeemed
         preferred stock of subsidiary                             (0.3)                -                   0.5                   -
                                                                 ------              ------            --------            --------
Net Income (Loss) Applicable to
     Common Stock                                                $  8.7              $(47.0)           $   26.4            $  (24.0)
                                                                 ======              ======            ========            ========
Earnings (Loss) per common share (basic
     and diluted)                                                 $0.12              ($0.66)              $0.38              ($0.34)
Cash dividends declared per
     common share                                                 $0.31               $0.31               $0.62               $0.62
Cash dividends paid per
      common share                                                $0.31               $0.31               $0.62               $0.62
Weighted average number of
     common shares outstanding
     during period                                           69,919,287          71,712,791          69,919,287          71,707,054


                                       5



                              ILLINOVA CORPORATION
                 CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
          (See accompanying Notes to Consolidated Financial Statements)


                                                                      THREE MONTHS ENDED      SIX MONTHS ENDED
                                                                            JUNE 30,              JUNE 30,
                                                                      1999         1998       1999       1998
                                                                                     (Unaudited)
                                                                               (Millions of Dollars)

                                                                                            
Net Income (Loss) Applicable to Common Stock                           $8.7      ($47.0)      $26.4     ($24.0)
                                                                      -----      ------      ------     -------
Other Comprehensive Income, before tax
     Foreign currency translation adjustments                          (0.1)        -          (0.2)       -
     Unrealized gains on securities                                     2.8         -           3.3        -
                                                                      -----      ------      ------     -------
         Other comprehensive income, before tax                         2.7         -           3.1        -
     Income taxes on other comprehensive income                        (1.1)        -          (1.3)       -
                                                                      -----      ------      ------     -------
     Other comprehensive income, net of tax                             1.6         -           1.8        -
                                                                     ------      ------      ------     -------
Comprehensive Income (Loss)                                           $10.3      ($47.0)      $28.2     ($24.0)
                                                                     ======      ======      ======     =======


                                       6

                              ILLINOVA CORPORATION
                      CONSOLIDATED STATEMENTS OF CASH FLOWS
          (See accompanying Notes to Consolidated Financial Statements)

                                                             SIX MONTHS ENDED
                                                                  JUNE 30,
                                                             1999         1998
                                                                (Unaudited)
                                                          (Millions of dollars)

CASH FLOWS FROM OPERATING ACTIVITIES
     Net income (loss)                                     $  25.9     $ (24.0)
     Items not requiring cash, net                           139.6        29.4
     Changes in assets and liabilities                      (124.0)      229.3
                                                           -------     -------

     Net cash provided by operating activities                41.5       234.7
                                                           -------     -------

CASH FLOWS FROM INVESTING ACTIVITIES
     Construction expenditures                              (150.5)     (115.0)
     Other investing activities                              (31.0)      (28.3)
                                                           -------     -------

     Net cash used in investing activities                  (181.5)     (143.3)
                                                           -------     -------

CASH FLOWS FROM FINANCING ACTIVITIES
     Dividends on common stock                               (43.3)      (44.4)
     Reissuance of common stock                                -           0.7
     Capital lease repayment                                 (61.1)        -
     Redemptions -
          Short-term debt                                   (451.4)     (154.8)
          Long-term debt of subsidiary                      (428.8)     (109.2)
          Preferred stock of subsidiary                      (11.7)        -
     Issuances -
          Short-term debt                                    425.8       107.8
          Long-term debt                                     250.0        92.4
     Other financing activities                              (22.2)        0.5
                                                           -------     -------
     Net cash used in financing activities                  (342.7)     (107.0)
                                                           -------     -------

     NET CHANGE IN CASH AND CASH EQUIVALENTS                (482.7)      (15.6)
     CASH AND CASH EQUIVALENTS
        AT BEGINNING OF YEAR                                 518.1        33.0
                                                           -------     -------

     CASH AND CASH EQUIVALENTS
        AT END OF PERIOD                                   $  35.4     $  17.4
                                                           =======     =======

                                       7

                             ILLINOIS POWER COMPANY
                           CONSOLIDATED BALANCE SHEETS
          (See accompanying Notes to Consolidated Financial Statements)

                                                JUNE 30,         DECEMBER 31,
                                                  1999              1998
ASSETS                                        (Unaudited)         (Audited)
                                                   (Millions of Dollars)
Utility Plant
   Electric (includes construction work
       in progress of $154.6 million and
       $177.7 million, respectively)           $5,584.1          $5,481.8
   Gas (includes construction work
       in progress of $13.2 million and
       $15.3 million, respectively)               693.7             686.9
                                               --------          --------
                                                6,277.8           6,168.7
Less - Accumulated depreciation                 1,756.4           1,713.7
                                               --------          --------
                                                4,521.4           4,455.0
Nuclear fuel                                       15.5              20.3
                                               --------          --------
     Total utility plant                        4,536.9           4,475.3
                                               --------          --------
Investments and Other Assets                        2.8               2.6
                                               --------          --------
Current Assets
   Cash and cash equivalents                       17.0             504.5
   Accounts receivable (less allowance
    for doubtful accounts of $5.5 million)
     Service                                      123.4             105.9
     Other                                         43.1              32.5
   Accrued unbilled revenue                        70.7              82.6
   Materials and supplies, at average cost         80.3              90.4
   Assets from commodity price risk
     management activities                         27.6              26.0
   Prepayments and other                           40.0              42.8
                                               --------          --------
     Total current assets                         402.1             884.7
                                               --------          --------
Deferred Charges
   Transition period cost recovery                778.1             783.0
   Other                                          318.5             284.2
                                               --------          --------
     Total deferred charges                     1,096.6           1,067.2
                                               --------          --------
                                               $6,038.4          $6,429.8
                                               ========          ========

                                       8



                                                         ILLINOIS POWER COMPANY
                                                       CONSOLIDATED BALANCE SHEETS
                                      (See accompanying Notes to Consolidated Financial Statements)

                                                           JUNE 30,           DECEMBER 31,
                                                             1999                 1998
CAPITAL AND LIABILITIES                                  (Unaudited)           (Audited)
                                                             (Millions of Dollars)
                                                                      
Capitalization
    Common stock -
      No par value, 100,000,000 shares
      authorized; 75,643,937 shares issued,
      stated at                                           $1,382.5          $1,382.4
    Retained earnings - accumulated since 1/1/99              14.3               -
    Accumulated other comprehensive income                     1.9               -
    Less - Capital stock expense                               7.3               7.3
    Less - 12,751,724 shares of
      common stock in treasury, at cost                      286.4             286.4
                                                          --------          --------
           Total common stock equity                       1,105.0           1,088.7
    Preferred stock                                           50.4              57.1
    Company obligated mandatorily
      redeemable preferred stock                             194.0             199.0
    Long-term debt                                         2,137.2           2,158.5
                                                          --------          --------
           Total capitalization                            3,486.6           3,503.3
                                                          --------          --------

Current Liabilities
    Accounts payable                                         201.1             216.2
    Notes payable                                             80.0             147.6
  Long-term debt and lease obligations
      maturing within one year                               287.1             506.6
    Liabilities from commodity price
      risk management activities                              61.0              61.6
    Other                                                    132.4             150.5
                                                          --------          --------
           Total current liabilities                         761.6           1,082.5
                                                          --------          --------
Deferred Credits
    Accumulated deferred income taxes                        968.8             978.7
    Accumulated deferred investment tax credits               38.8              39.6
    Decommissioning liability                                528.5             567.4
    Other                                                    254.1             258.3
                                                          --------          --------
           Total deferred credits                          1,790.2           1,844.0
                                                          --------          --------
                                                          $6,038.4          $6,429.8
                                                          ========          ========

                                       9




                             ILLINOIS POWER COMPANY
                        CONSOLIDATED STATEMENTS OF INCOME
          (See accompanying Notes to Consolidated Financial Statements)

                                                   THREE MONTHS ENDED        SIX MONTHS ENDED
                                                         JUNE 30,                JUNE 30,
                                                     1999        1998        1999        1998
                                                                    (Unaudited)
                                                               (Millions of dollars)
Operating Revenues:
                                                                            
     Electric                                      $276.7       $304.5      $531.9      $581.1
     Electric interchange                            56.2        112.7       150.2       209.0
     Gas                                             45.2         49.8       168.3       166.4
                                                   ------       ------      ------      ------
          Total                                     378.1        467.0       850.4       956.5
                                                   ------       ------      ------      ------

Operating Expenses and Taxes:
     Fuel for electric plants                        60.0         53.9       111.4       109.6
     Power purchased                                 46.7        229.4        98.4       326.5
     Gas purchased for resale                        17.0         22.4        89.5        88.4
     Other operating expenses                        81.0         87.9       191.4       167.7
     Maintenance                                     26.1         35.0        67.4        64.0
     Depreciation and amortization                   44.9         50.5        89.4       101.2
     Amortization of regulatory asset                 6.2            -         7.7           -
     General taxes                                   22.9         34.3        52.8        73.0
     Income taxes                                    23.0        (36.6)       36.7       (25.9)
                                                   ------       ------      ------      ------
          Total                                     327.8        476.8       744.7       904.5
                                                   ------       ------      ------      ------
Operating Income (Loss)                              50.3         (9.8)      105.7        52.0
                                                   ------       ------      ------      ------
Other Income and Deductions, Net                     11.6          1.3        17.8         2.9
                                                   ------       ------      ------      ------
Income (Loss) Before Interest Charges                61.9         (8.5)      123.5        54.9
                                                   ------       ------      ------      ------

Interest Charges and Other:
     Interest expense                                43.9         33.3        83.7        67.4
     Allowance for borrowed funds
          used during construction                  (2.0)         (1.2)       (3.2)       (2.3)
                                                   ------       ------      ------      ------
          Total                                      41.9         32.1        80.5        65.1
                                                   ------       ------      ------      ------

Net Income (Loss)                                    20.0        (40.6)       43.0       (10.2)
     Less-Preferred dividend
          requirements                                4.7          5.0         9.7         9.9
     Plus - Carrying amount (under) over
          consideration paid for
          redeemed preferred stock                  (0.3)            -         0.5           -
                                                   ------       ------      ------      ------
Net Income (Loss) Applicable to
     Common Stock                                   $15.0       ($45.6)      $33.8      ($20.1)
                                                   ======      =======      ======      ======

                                       10





                             ILLINOIS POWER COMPANY
                 CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
          (See accompanying Notes to Consolidated Financial Statements)


                                                                         THREE MONTHS ENDED        SIX MONTHS ENDED
                                                                               JUNE 30,                JUNE 30,
                                                                        1999       1998             1999      1998
                                                                                        (Unaudited)
                                                                                 (Millions of Dollars)

                                                                                                 
Net Income (Loss) Applicable to Common Stock                           $15.0     ($45.6)           $33.8     ($20.1)
                                                                       -----     ------            -----     ------

Other Comprehensive Income, before tax
     Unrealized gains on securities                                      2.7          -              3.1          -
     Income taxes on other comprehensive income                         (1.0)         -             (1.2)         -
                                                                       -----     ------            -----     ------
     Other comprehensive income, net of tax                             1.7           -              1.9          -
                                                                       -----     ------            -----     ------

Comprehensive Income (Loss)                                            $16.7     ($45.6)           $35.7     ($20.1)
                                                                       =====     ======            =====     ======

                                       11


                             ILLINOIS POWER COMPANY
                      CONSOLIDATED STATEMENTS OF CASH FLOWS
          (See accompanying Notes to Consolidated Financial Statements)

                                                            SIX MONTHS ENDED
                                                               JUNE 30,
                                                            1999        1998
                                                               (Unaudited)
                                                         (Millions of dollars)

CASH FLOWS FROM OPERATING ACTIVITIES
     Net income (loss)                                  $  43.0         $(10.2)
     Items not requiring cash, net                        133.0           34.0
     Changes in assets and liabilities                   (137.8)         222.9
                                                        -------         ------

     Net cash provided by operating activities             38.2          246.7
                                                        -------         ------

CASH FLOWS FROM INVESTING ACTIVITIES
     Construction expenditures                           (150.4)        (115.0)
     Other investing activities                            (5.3)           3.9
                                                        -------         ------

     Net cash used in investing activities               (155.7)        (111.1)
                                                        -------         ------

CASH FLOWS FROM FINANCING ACTIVITIES
     Dividends on preferred and common stock              (28.6)         (52.7)
     Repurchase of common stock                               -          (29.4)
     Capital lease repayment                              (61.1)             -
     Redemptions -
          Short-term debt                                (385.4)        (107.4)
          Long-term debt                                 (428.8)        (109.2)
          Preferred stock                                 (11.7)             -
     Issuances -
          Short-term debt                                 317.8           98.9
          Long-term debt                                  250.0           52.4
     Other financing activities                           (22.2)           0.3
                                                        -------         ------

     Net cash used in financing activities               (370.0)        (147.1)
                                                        -------         ------

NET CHANGE IN CASH AND CASH EQUIVALENTS                  (487.5)         (11.5)
CASH AND CASH EQUIVALENTS
        AT BEGINNING OF YEAR                              504.5           17.8
                                                        -------         ------

CASH AND CASH EQUIVALENTS
        AT END OF PERIOD                                $  17.0         $  6.3
                                                        =======         ======

                                       12


                 ILLINOVA CORPORATION AND ILLINOIS POWER COMPANY
                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

GENERAL

        Financial  statement note  disclosures,  normally  included in financial
statements prepared in conformity with generally accepted accounting principles,
have been omitted from this Form 10-Q pursuant to the Rules and  Regulations  of
the  Securities  and  Exchange  Commission  (SEC).  However,  in the  opinion of
Illinova Corporation (Illinova) and Illinois Power Company (IP), the disclosures
and information contained in this Form 10-Q are adequate and not misleading. See
the consolidated  financial  statements and the accompanying notes in Illinova's
1998 Annual  Report to  Shareholders,  (included  in the Proxy  Statement),  the
consolidated financial statements and the accompanying notes in IP's 1998 Annual
Report to Shareholders (included in the Information  Statement),  Illinova's and
IP's 1998 Form 10-K  filings to the SEC, and  Illinova's  and IP's 1998 Form 8-K
filings  to the SEC  for  information  relevant  to the  consolidated  financial
statements contained herein,  including information as to certain regulatory and
environmental matters and as to the significant accounting policies followed.

        In the opinion of Illinova,  the  accompanying  unaudited June 30, 1999,
and audited December 31, 1998,  consolidated  financial  statements for Illinova
reflect all  adjustments  necessary to present fairly the  Consolidated  Balance
Sheets as of June 30, 1999, and December 31, 1998, the  Consolidated  Statements
of  Income  for the three  and six  months  ended  June 30,  1999 and 1998,  the
Consolidated  Statements  of  Comprehensive  Income for the three and six months
ended June 30, 1999 and 1998, and the Consolidated  Statements of Cash Flows for
the three and six  months  ended  June 30,  1999 and 1998.  In  addition,  it is
Illinova's and IP's opinion that the  accompanying  unaudited June 30, 1999, and
audited December 31, 1998,  consolidated financial statements for IP reflect all
adjustments  necessary to present fairly the  Consolidated  Balance Sheets as of
June 30, 1999, and December 31, 1998, the Consolidated  Statements of Income for
the  three  and six  months  ended  June 30,  1999 and  1998,  the  Consolidated
Statements of  Comprehensive  Income for the three and six months ended June 30,
1999 and 1998, and the  Consolidated  Statements of Cash Flows for the three and
six months ended June 30, 1999 and 1998. Due to seasonal and other factors which
are  characteristic  of electric  and gas  utility  operations,  interim  period
results are not necessarily indicative of results to be expected for the year.

        The consolidated  financial  statements of Illinova include the accounts
of Illinova,  IP, Illinova Generating Company (IGC),  Illinova Insurance Company
(IIC), Illinova Energy Partners,  Inc. (IEP), and Illinova Business Enterprises,
Inc. (IBE). All significant  intercompany  balances and  transactions  have been
eliminated from the  consolidated  financial  statements.  All  transactions for
Illinova's  unregulated   subsidiaries  are  included  in  the  sections  titled
"Diversified  Enterprises," "Interest Charges," "Income Taxes" and "Other Income
and Deductions" in Illinova's Consolidated Statements of Income.

        The  consolidated  financial  statements  of IP include the  accounts of
Illinois Power Capital, L.P., Illinois Power Financing I (IPFI),  Illinois Power
Securitization  Limited  Liability  Company,  and Illinois Power Special Purpose
Trust (IPSPT). All significant  intercompany balances and transactions have been
eliminated from the consolidated financial statements. All non-utility operating
transactions  are included in the section  titled "Other Income and  Deductions,
Net" in IP's Consolidated Statements of Income.


                                       13


REGULATORY AND LEGAL MATTERS

   OPEN ACCESS AND COMPETITION

         The Illinois  Customer Choice and Rate Relief Act of 1997, P.A. 90-561,
Illinois  electric utility  restructuring  legislation,  was enacted in December
1997. P.A. 90-561 gives IP's residential customers a 15 percent decrease in base
electric rates  beginning  August 1, 1998, and an additional 5 percent  decrease
effective  May 1,  2002.  The rate  decreases  result in revenue  reductions  of
approximately   $35  million  in  1998,  and  expected  revenue   reductions  of
approximately $70 million in each of the years 1999 through 2001,  approximately
$90  million in 2002,  and  approximately  $100  million in 2003,  based on 1997
levels of consumption and compared to rates in effect in 1997.

         Under P.A. 90-561,  customers with demand greater than 4 MW at a single
site and  customers  with at least 10 sites which  aggregate  at least 9.5 MW in
total demand will be free to choose their electric generation suppliers ("direct
access") starting October 1999. Direct access for the remaining  non-residential
customers  will occur in two phases:  customers  representing  one-third  of the
remaining  load in the  non-residential  class in  October  1999  and  customers
representing  the entire  remaining  non-residential  load on December 31, 2000.
Direct  access will be available to all  residential  customers in May 2002.  IP
remains obligated to serve all customers who continue to take service from IP at
tariff  rates and  remains  obligated  to  provide  delivery  service  to all at
regulated rates. Rates for delivery services for non-residential  customers will
be established in 1999, in proceedings mandated by P.A. 90-561.

         Although the specified residential rate reductions and the introduction
of direct access will lead to lower electric  service  revenues,  P.A. 90-561 is
designed to protect the  financial  integrity  of  electric  utilities  in three
principal ways:

1)   Departing customers are obligated to pay transition  charges,  based on the
     utility's  lost  revenue from that  customer.  The  transition  charges are
     applicable  through  2006 and can be extended two  additional  years by the
     Illinois Commerce  Commission (ICC). The transition  charges are calculated
     by subtracting  from a customer's fully bundled rate an amount equal to: a)
     delivery charges the utility will continue to receive from the customer, b)
     the market value of the freed-up energy, and c) a mitigation factor,  which
     is the higher of a fixed  rate per kwh or a  percentage  of the  customer's
     bundled base rate. The mitigation  factor  increases  during the transition
     period. By Specifically  preventing IP from being held completely  harmless
     with regard to revenue loss, the  mitigation  factor is designed to provide
     incentive for  management to continue cost  reduction  efforts and generate
     new sources of revenue;

2)   Utilities are provided the opportunity to lower their financing and capital
     costs through the issuance of "securitized" bonds, also called transitional
     funding instruments; and

3)   Utilities are permitted to seek rate relief in the event that the change in
     law leads to their return on equity falling below a specified minimum based
     on a prescribed test. Utilities are also subject to an "over-earnings" test
     which requires them, in effect, to share with customers  earnings in excess
     of specified levels.

         The extent to which revenues are affected by P.A. 90-561 will depend on
a number of factors  including  future  market  prices for  wholesale and retail
energy,  load growth and demand levels in the current IP service territory,  and
success in marketing to customers outside IP's service territory.  The impact on
net income will depend on, among other things,  actual  revenues and the cost of
doing business.

                                       14


         ACCOUNTING MATTERS


         Prior to the  enactment of P.A.  90-561,  IP prepared its  consolidated
financial  statements in accordance with FAS 71,  "Accounting for the Effects of
Certain Types of  Regulation."  Because P.A.  90-561  provides for  market-based
pricing of electric generation services,  IP discontinued  application of FAS 71
for its generating segment in December 1997, when P.A. 90-561 was enacted.

         In December 1998,  Illinova's  and IP's Boards of Directors  decided to
exit the nuclear  portion of the  business by either sale or shutdown of Clinton
Power Station (Clinton).  FAS 121,  "Accounting for the Impairment of Long-Lived
Assets  and  for  Long-Lived  Assets  to be  Disposed  Of,"  requires  that  all
long-lived  assets for which  management  has committed to a plan of disposal be
reported  at the lower of  carrying  amount or fair  value  less  costs to sell.
Consequently, IP wrote off the value of Clinton and accrued Clinton-related exit
costs,  which resulted in a $1,372.2  million loss, net of income taxes,  and an
accumulated  deficit in Illinova's  consolidated  retained  earnings  balance of
$1,419.5 million.

         Illinova's  and IP's Boards of Directors also chose in December 1998 to
effect  a  quasi-reorganization.   The  quasi-reorganization  is  an  accounting
procedure  that  eliminated  the  accumulated  deficit in retained  earnings and
permitted  the  Company  to  proceed  on much the  same  basis as if it had been
legally  reorganized by restating the Company's  assets and liabilities to their
fair values,  with the net amount of these adjustments added to or deducted from
the deficit. The remaining deficit in retained earnings was then eliminated by a
transfer  from paid-in  capital,  giving the Company a "fresh start" with a zero
balance in retained earnings.  The  quasi-reorganization  eliminated  Illinova's
consolidated accumulated deficit in retained earnings of $1,419.5 million.

         IP  recognized  the  impairment of  Clinton-related  assets and accrued
exit-related  costs in  December  1998,  based on expected  plant  closure as of
August 31, 1999.  IP now expects to consummate  the sale of the  Clinton-related
assets by the end of 1999. On receipt of various regulatory  approvals necessary
to consummate  the sale, IP will adjust its accruals for  exit-related  costs in
accordance  with the terms of the sale.  The  estimated  effect of adjusting the
accruals  for  exit-related  costs  is a $292  million  decrease.  Reduction  of
exit-related accruals will not immediately impact earnings.  The decrease in the
accruals  will result in a decrease in the book value of IP's fossil  generation
assets,  which were  written up to fair value in  conjunction  with the December
1998  quasi-reorganization,  which occurred coincident with the establishment of
such exit-related  accruals. The $292 million decrease in the book value of IP's
fossil  generation  assets  will  result  in an  estimated  annual  decrease  in
depreciation of the fair value adjustment of $9.5 million.

         Implementation of a  quasi-reorganization  required the adoption of any
accounting  standards  that  had not yet been  adopted  because  their  required
implementation date had not occurred.  All applicable  accounting standards were
adopted as of December 1998. The standards adopted included FAS 133, "Accounting
for  Derivative   Instruments  and  Hedging   Activities,"   EITF  Issue  98-10,
"Accounting  for  Contracts  Involved  in  Energy  Trading  and Risk  Management
Activities," SOP 98-1,  "Accounting for the Costs of Computer Software Developed
or Obtained for Internal Use," and SOP 98-5, "Reporting on the Costs of Start-Up
Activities."

        Illinova and IP recognized other comprehensive income for the six months
ended June 30, 1999, as required by FAS 130, "Reporting  Comprehensive  Income."
FAS 130 established  standards for reporting and display of comprehensive income
and  its  components  in a full  set of  general-purpose  financial  statements.

                                       15


Illinova and IP have adopted the two-statement  approach, as provided for by FAS
130 and present a separate statement of comprehensive  income in addition to the
income statement.  Items included in Illinova's other  comprehensive  income for
the three and six  months  ended  June 30,  1999,  include  unrealized  gains on
securities,  foreign currency translations, and related income taxes. IP's other
comprehensive income for the three and six months ended June 30, 1999, comprised
unrealized  gains on securities held in IP's nuclear  decommissioning  trust and
related income taxes. There were no items reported as other comprehensive income
in 1998.


MANUFACTURED GAS PLANT SITES

        IP has recorded an estimated  liability for Manufactured Gas Plant (MGP)
site remediation of $59 million. This amount represents IP's current estimate of
the  costs  it  will  incur  to  remediate  the 24 MGP  sites  for  which  it is
responsible.  Because of the unknown and unique characteristics at each site, IP
cannot currently determine its ultimate liability for remediation of the sites.

         In October  1995,  to offset the burden  imposed on its  customers,  IP
initiated  litigation  against a number of insurance  carriers.  Settlements  or
settlements  in principle  have been  reached  with all thirty of the  carriers.
Settlement  proceeds  recovered  from the  carriers  will  offset a  significant
portion of the MGP remediation  costs and will be credited to customers  through
the tariff rider mechanism which the ICC has previously approved.  Cleanup costs
in excess of insurance  proceeds will be fully recovered from IP's  transmission
and distribution customers.


TREASURY STOCK

        Through June 30, 1999, IP has purchased a total of 12,751,724  shares of
its common  stock from  Illinova,  all of which are held as  treasury  stock and
deducted from common equity at the cost of the shares purchased. No shares of IP
common  stock were  purchased  during  the first six months of 1999.  In October
1998,  the Illinova  Board approved the repurchase of up to 12 million shares of
Illinova  common stock over the next six to twelve  months in  conjunction  with
IP's issuance of  securitized  debt. No  additional  repurchases  are planned at
present.  For  more  information,  see  "Liquidity  and  Capital  Resources"  of
"Management's  Discussion  and  Analysis of Financial  Condition  and Results of
Operations" on page 34 of this report.

        As part of the  contemplated  merger  with  Dynegy,  on June  13,  1999,
Illinova entered into a forward  purchase  agreement  allowing  purchases on the
open market of up to 6.64 million shares of Illinova  common stock over the next
two years. At present no shares have been purchased under this agreement.


FINANCIAL AND OTHER DERIVATIVE INSTRUMENTS

        Trading  Activities-  Illinova,  through its  subsidiaries,  IP and IEP,
engages in the brokering and  marketing of  electricity  and natural gas. IP and
IEP  use a  variety  of  instruments,  including  fixed-price  swap  agreements,
variable-price  swap  agreements,  exchange-traded  energy  futures  and options
contracts, and over-the-counter forwards, swaps, and options.

        As of December 31,  1998,  Illinova  and its  subsidiaries  adopted EITF
98-10.  For more  information  regarding  Illinova's  adoption of new accounting
pronouncements,  see  Accounting  Matters  of  this  section  on page 15 of this
report.  At June 30, 1999, IP's and IEP's derivative assets and liabilities were

                                       16


recorded in the Consolidated  Balance Sheets at fair value with unrealized gains
and losses shown net in the Consolidated Statements of Income. IP and IEP record
realized  gains and losses as  components  of operating  revenues and  operating
expenses in the Consolidated Statements of Income.

        The notional quantities and average terms of commodity  instruments held
for trading purposes at June 30, 1999, are presented below:

                        Volume-Fixed        Volume-Fixed          Average
                         Price Payor       Price Receiver           Term
Electricity
   IP                       1,650 MW           1,550 MW            1 year
   IEP                     11,475 MW          11,339 MW            1 year
Gas
   IEP (in thousands)       5,980 MMBtu        5,980 MMBtu         1 year

        All  notional  amounts  reflect  the volume of  transactions  but do not
represent the dollar amounts or actual megawatts exchanged by the parties to the
contracts.  Accordingly,  notional amounts do not accurately  measure Illinova's
exposure to market or credit risk.

        The  estimated  fair value of  commodity  instruments  held for  trading
purposes at June 30, 1999, are presented below:

                                            Fair Value          Fair Value
      (Millions of dollars)                   Assets            Liabilities

Electricity
   IP                                          $23.5              $49.0
   IEP                                          28.8               37.5
                                                ----               ----
                                                52.3               86.5

Gas
   IEP                                           1.8                1.1
                                                 ---                ---
                                               $53.8              $87.6

        The fair value was  estimated  using  quoted  prices and  indices  where
available and the liquidity of the market for the instrument was considered. The
fair values are subject to volatility based on changing market conditions.

        The weighted average term of the trading portfolio,  based on volume, is
less than one year.  The  maximum  and average  terms  disclosed  herein are not
indicative of likely future cash flows as these positions may be modified by new
transactions in the trading portfolio at any time in response to changing market
conditions, market liquidity, and Illinova's risk management portfolio needs and
strategies.  Terms  regarding  cash  settlements  of these  contracts  vary with
respect to the actual timing of cash receipts and payments.

Non-Trading Activities- To reduce the risk from market fluctuations in the price
of electricity and related  transmission,  Illinova,  through its subsidiary IP,
enters into forward transactions, swaps, and options (energy derivatives). These
instruments are used to hedge expected  purchases,  sales,  and  transmission of
electricity  (a portion of which are firm  commitments  at the  inception of the
hedge).  The weighted  average  maturity of these  instruments  is less than one
year.

        Periodically,   IP  has  used  interest  rate  derivatives  (principally
interest  rate swaps and caps) to adjust the portion of its  overall  borrowings
subject to interest rate risk. As of June 30, 1999,  there were no interest rate
derivatives outstanding.

        In order to hedge  expected  purchases  of emission  allowances,  IP has
entered into swap  agreements  and written put options  with other  utilities to
mitigate the risk from market  fluctuations in the price of the  allowances.  At

                                       17


June 30, 1999, the notional  amount of two emission  allowance swaps was 126,925
units,  with a  recorded  liability  of $19.9  million,  based on fair  value at
delivery date. The maximum  maturity of the swap  agreements is 10 years.  These
swap  agreements  do not fall  under  the  scope of FAS 133.  Due to the  remote
probability  of  exercise,  the three put options  written by IP are  considered
immaterial.

        As of December 31, 1998, Illinova and its subsidiaries  adopted FAS 133.
IP's  derivative   assets  and   liabilities  are  currently   recorded  on  the
Consolidated Balance Sheets at fair value with unrealized gains and losses shown
net in the Consolidated  Statements of Income. Hedge accounting was not applied.
In the future, if hedge accounting is applied,  unrealized gains and losses will
be shown as a component  of  Comprehensive  Income in the equity  section of the
Consolidated  Balance Sheets. IP records realized gains and losses as components
of operating revenues and operating  expenses in the Consolidated  Statements of
Income.  As of June  30,  1999,  all  non-trading  derivative  instruments  were
accounted for using mark-to-market accounting.

        The  notional  quantities  and the  average  term of  energy  derivative
commodity  instruments  held for other than  trading  purposes at June 30, 1999,
follows:

                             Volume-Fixed       Volume-Fixed       Average
                             Price Payor       Price Receiver        Term
Electricity
   IP                           650 MW             150 MW            1 year

        In addition to the fixed-price notional volumes above, IP recorded a $25
million  liability  in 1998  for  two  "commodity  for  commodity"  energy  swap
agreements  totaling 350 MW which are not  considered  derivatives as defined by
FAS 133. As of June 30, 1999, the swap liability decreased to $21.6 million. The
decrease in the liability is due to IP's commencing  repayment of one power swap
in January 1999.

        The  notional  amount  is  intended  to be  indicative  of the  level of
activity in such  derivatives,  although  the amounts at risk are  significantly
smaller because changes in the market value of these  derivatives  generally are
offset  by  changes  in  the  value  associated  with  the  underlying  physical
transactions or in other derivatives.  When energy derivatives are closed out in
advance of the  underlying  commitment or  anticipated  transaction,  the market
value changes may not be offset  because price  movement  correlation  ceases to
exist when the positions are closed.

        The estimated fair values of energy  derivative  commodity  instruments,
held for non-trading purposes at June 30, 1999, are presented below:

                                      Fair Value              Fair Value
     (Millions of dollars)              Assets                Liabilities

Electricity
   IP                                    $4.1                    $12.0

        The fair value was  estimated  using  quoted  prices and  indices  where
available,  and considering the liquidity of the market for the instrument.  The
fair  values are subject to  significant  volatility  based on  changing  market
conditions.

        The average maturity and fair values discussed above are not necessarily
indicative of likely future cash flows.  These  positions may be modified by new
offsetting transactions at any time in response to changing generation forecast,
market conditions,  market liquidity,  and Illinova's risk management  portfolio
needs and strategies.  Terms regarding cash  settlements of these contracts vary
with respect to the actual timing of cash receipts and payments.

                                       18


ILLINOVA - SEGMENTS OF BUSINESS

In 1997, the FASB issued FAS 131,  "Disclosures  about Segments of an Enterprise
and Related Information." This statement superseded FAS 14, "Financial Reporting
for  Segments of a Business  Enterprise,"  and  established  new  standards  for
defining a company's  segments and  disclosing  information  about them. The new
statement  requires  that  segments  be  based  on the  internal  structure  and
reporting of a company's operations.

The Illinova enterprise comprises six separate corporations and eight functional
business  groups.  The business  groups and their  principal  activities  are as
follows:

o    IP Customer Service Business Group - transmission,  distribution,  and sale
     of electric energy; distribution,  transportation,  and sale of natural gas
     in Illinois.
o    IP Wholesale Energy Business Group - fossil-fueled  electric  generation in
     Illinois,  wholesale electricity transactions throughout the United States,
     and dispatching activities.
o    IP Nuclear Generation  Business Group - nuclear-fueled  electric generation
     in Illinois.
o    Illinova Energy Partners - energy-related  products and services throughout
     the United States and Canada.
o    Illinova  Generating  Company - independent  power projects  throughout the
     world.
o    IP  Financial   Business  Group  -  financial  support  functions  such  as
     accounting,  finance, corporate performance, audit and compliance, investor
     relations,  legal, corporate development,  regulatory, risk management, and
     tax services.
o    IP  Support  Services  Business  Group  -  specialized  support  functions,
     including information technology, human resources, environmental resources,
     purchasing and materials management, and public affairs.
o    Corporate - Illinova  Corporation,  Illinova Insurance Company and Illinova
     Business  Enterprises - holding company;  insurance and risk products;  and
     miscellaneous business lines.

Of the above-listed  segments,  the IP Financial  Business Group, the IP Support
Services  Business Group,  and Corporate did not  individually  meet the minimum
threshold  requirements  for separate  disclosure  and are combined in the Other
category.

In 1998,  three  measures were used to judge segment  performance:  contribution
margin, cash flow, and return on net invested capital. In 1999, two measures are
used to judge segment  performance:  contribution margin and cash flow. Omission
of return on net  invested  capital  provides for  increased  focus on near-term
financial needs.

                                       19




Illinova Corporation
Three Months Ended June 30, 1999                              (Millions of Dollars)

                                                                                 Illinova
                                       Customer      Wholesale                    Energy        Illinova      Other         Consoli-
                                       Service        Energy        Nuclear      Partners      Generating                    dated
1999
                                                                                                      
Revenues from external customers       $320.8          $51.8          $5.5        $   -          $  -         $  -           $378.1
Diversified enterprise revenue             -              -             -           77.4          24.1         (0.3)          101.2
Intersegment revenue (1)                   -           118.9          37.2            -             -            -            156.1
                                       --------------------------------------------------------------------------------------------
   Total Revenue                        320.8          170.7          42.7          77.4          24.1         (0.3)          635.4
Depreciation and amortization
   expense                               23.7           25.7           1.6            -             -           0.1            51.1
Other operating expenses (1)            209.8          135.3          59.6          80.7          23.3         12.6           524.3
                                       --------------------------------------------------------------------------------------------
   Operating income (loss)               87.3            9.7         (18.5)         (3.3)         (2.2)       (13.0)           60.0
Interest expense                         19.3           21.1           3.3            -             -           3.1            46.8
AFUDC                                    (0.4)          (1.6)           -             -             -          (0.0)           (2.0)
                                       --------------------------------------------------------------------------------------------
   Income (loss) before taxes            68.4           (9.8)        (21.8)         (3.3)         (2.2)       (16.1)           15.2
Income tax expense (benefit)             26.2           (4.3)         (7.5)         (1.1)         (0.5)        (2.1)           10.7
Miscellaneous - net                       0.2           (1.9)         (1.6)           -           (0.5)        (1.0)           (4.8)
Equity earnings in affiliates              -              -             -           (0.6)         (2.2)        (0.1)           (2.9)
Interest revenue                           -              -           (0.8)           -             -          (0.7)           (1.5)
                                       --------------------------------------------------------------------------------------------
   Net income (loss) after taxes         42.0           (3.6)        (11.9)         (1.6)          1.0        (12.2)           13.7
Preferred dividend requirement and
   carrying amount over (under)
   consideration paid for redeemed
   preferred stock                        2.6            2.8          (0.7)           -             -          (0.3)            5.0
                                       --------------------------------------------------------------------------------------------
Net income (loss) applicable
   to common stock                      $39.4          $(6.4)       $(11.2)        $(1.6)         $1.0       $(12.5)           $8.7
- -----------------------------------------------------------------------------------------------------------------------------------
Other information -
   Total assets (2)                  $2,640.7       $3,162.4        $199.0         $97.6        $241.0       $114.7        $6,455.4
   Subsidiary's investment in
      equity method investees             -               -             -            9.8         192.4           -            202.2
   Total expenditures for additions
      to long-lived assets               27.2           86.0            -             -             -           2.1           115.3
- -----------------------------------------------------------------------------------------------------------------------------------
Corporate Measures -
   Contribution margin (3)              $52.5           $7.1        $(10.0)        $(1.6)         $1.0       $(10.4)          $38.6
   Cash flow (4)                         18.1          (51.2)        (26.4)         (2.9)          9.0         35.7           (17.7)
   Return on net invested capital (5)     N/A            N/A           N/A           N/A           N/A          N/A             N/A


(1)  Intersegment  revenue priced at 2.9 cents per kwh  delivered.  Intersegment
     expense is reflected in other operating expenses for Customer Service. Both
     intersegment  revenue  and  expenses  were  eliminated for purposes  of the
     Consolidated Statements of Income.
(2)  Asset balances recorded by the business groups are significantly  different
     in 1999 due to the  impact  of the  impairment  and  write-off  of  nuclear
     generation, fair market valuation of fossil generation and recording of the
     regulatory asset to the Customer Service Business Group.
(3)  Contribution  margin  represented  by net  income  before  financing  costs
     (net-of-tax) and preferred dividend requirement.
(4)  Cash flow before financing activities.
(5)  Return on net invested capital is no longer a corporate measure in 1999.

                                       20





Illinova Corporation
Three Months Ended June 30, 1998                                                   (Millions of Dollars)

                                                                                 Illinova
                                      Customer       Wholesale                    Energy        Illinova       Other        Consoli-
                                       Service        Energy        Nuclear      Partners      Generating                    dated
1998
                                                                                                      
Revenues from external customers       $352.9         $112.7          $1.4        $   -          $  -         $  -           $467.0
Diversified enterprise revenue             -              -             -           76.4           2.7          1.2            80.3
Intersegment revenue (1)                   -           120.2          (0.6)           -             -            -            119.6
                                       --------------------------------------------------------------------------------------------
   Total Revenue                        352.9          232.9           0.8          76.4           2.7          1.2           666.9
Depreciation and amortization
   expense                               16.9            7.5          24.7            -             -           1.4            50.5
Other operating expenses (1)            209.6          284.9          84.4          78.3           4.9          5.4           667.5
                                       --------------------------------------------------------------------------------------------
   Operating income (loss)              126.4          (59.5)       (108.3)         (1.9)         (2.2)        (5.6)          (51.1)
Interest expense                          9.4            2.9          10.8            -             -          12.8            35.9
AFUDC                                    (0.3)          (0.3)        (0.5)            -             -          (0.1)           (1.2)
                                       --------------------------------------------------------------------------------------------
   Income (loss) before taxes           117.3          (62.1)       (118.6)         (1.9)         (2.2)       (18.3)          (85.8)
Income tax expense (benefit)             48.0          (26.7)        (50.9)         (0.6)         (0.6)        (6.8)          (37.6)
Miscellaneous - net                       0.3           (1.2)           -             -           (0.2)        (0.3)           (1.4)
Equity earnings in affiliates              -              -             -           (0.4)         (3.0)          -             (3.4)
Interest revenue                           -              -             -             -             -          (1.4)           (1.4)
                                       --------------------------------------------------------------------------------------------
   Net income (loss) after taxes         69.0          (34.2)        (67.7)         (0.9)          1.6         (9.8)          (42.0)
Preferred dividend requirement            1.7            0.6           2.5            -             -           0.2             5.0
                                       --------------------------------------------------------------------------------------------
Net income (loss) applicable
   to common stock                      $67.3         $(34.8)       $(70.2)        $(0.9)         $1.6       $(10.0)         $(47.0)
- -----------------------------------------------------------------------------------------------------------------------------------
Other information -
   Total assets                      $1,795.3         $715.6      $2,771.7         $53.1        $199.3       $102.9        $5,637.9
   Subsidiary's investment in
      equity method investees              -              -             -            9.6         173.8           -            183.4
   Total expenditures for additions
      to long-lived assets               30.7           17.2          19.0            -             -           1.5            68.4
- -----------------------------------------------------------------------------------------------------------------------------------
Corporate Measures -
   Contribution margin (2)              $73.4         $(33.6)       $(61.4)        $(0.9)         $1.6        $(2.8)         $(23.7)
   Cash flow (3)                         53.7           78.0         (70.4)          1.4          (0.9)       (23.0)           38.8
   Return on net invested capital (4)     5.6%          -7.4%          N/A           2.2%          0.8%         N/A            -0.7%
- -----------------------------------------------------------------------------------------------------------------------------------


(1)  Intersegment  revenue priced at 2.5 cents per kwh  delivered.  Intersegment
     expense is reflected  in other  operating  expenses  for Customer  Service.
     Nuclear  reflects a  replacement  power expense for the increment of market
     price over the intersegment  price. Both intersegment  revenue and expenses
     were eliminated for purposes of the Consolidated Statements of Income.
(2)  Contribution  margin  represented  by net  income  before  financing  costs
     (net-of-tax),  preferred dividend  requirement.
(3)  Cash flow before financing activities.
(4)  Return on net invested capital calculated as contribution margin divided by
     net invested capital.

                                       21


ILLINOVA GEOGRAPHIC INFORMATION

(Millions of dollars)
- --------------------------------------------------------------------------------
Second Quarter                           1999        1998
- --------------------------------------------------------------------------------
Revenues: (1)
     United States                      $474.9      $545.2
     Foreign countries (Seven)             4.4         2.1
                                        ------      ------
                                        $479.3      $547.3
                                        ======      ======


(Millions of dollars)
- --------------------------------------------------------------------------------
June 30,                                 1999        1998
- --------------------------------------------------------------------------------
Long-lived assets: (2)
     United States                    $4,507.5    $4,601.7
     Foreign countries (Nine)            161.8       132.2
                                      --------    --------
                                      $4,669.3    $4,733.9
                                      ========    ========

(1)  Revenues  are  attributed  to  geographic  regions  based  on  location  of
     customer.
(2)  Long-lived   assets   include   plant,   equipment,   and   investments  in
     subsidiaries.

                                       22




Illinova Corporation
Six Months Ended June 30, 1999                                                   (Millions of Dollars)

                                                                                Illinova
                                      Customer       Wholesale                   Energy         Illinova      Other         Consoli-
                                       Service        Energy        Nuclear      Partners       Generating                   dated
1999
                                                                                                      
Revenues from external customers       $697.5         $145.9          $7.0        $   -          $  -         $  -           $850.4
Diversified enterprise revenue             -              -             -          123.8          52.4          1.1           177.3
Intersegment revenue (1)                   -           254.8          36.5            -             -            -            291.3
                                       --------------------------------------------------------------------------------------------
   Total Revenue                        697.5          400.7          43.5         123.8          52.4          1.1         1,319.0
Depreciation and amortization
   expense                               42.2           51.3           3.6            -             -          (0.0)           97.1
Other operating expenses (1)            485.1          261.9         149.0         130.0          56.4         15.8         1,098.2
                                       --------------------------------------------------------------------------------------------
   Operating income (loss)              170.2           87.5        (109.1)         (6.2)         (4.0)       (14.7)          123.7
Interest expense                         38.6           41.0           4.0            -             -           6.3            89.9
AFUDC                                    (0.8)          (2.4)           -             -             -           0.0            (3.2)
                                       --------------------------------------------------------------------------------------------
   Income (loss) before taxes           132.4           48.9        (113.1)         (6.2)         (4.0)       (21.0)           37.0
Income tax expense (benefit)             50.6           18.0         (43.2)         (1.8)          1.2         (2.8)           22.0
Miscellaneous - net                       0.2           (1.8)         (2.1)           -           (6.7)        (2.2)          (12.6)
Equity earnings in affiliates              -              -             -           (1.6)         (1.8)          -             (3.4)
Interest revenue                           -              -           (1.9)           -             -          (2.7)           (4.6)
                                       --------------------------------------------------------------------------------------------
   Net income (loss) after taxes         81.6           32.7         (65.9)         (2.8)          3.3        (13.3)           35.6
Preferred dividend requirement and
   carrying amount over (under)
   consideratin paid for redeemed
   preferred stock                        5.5           5.8           (1.6)           -             -          (0.5)            9.2
                                       --------------------------------------------------------------------------------------------
Net income (loss) applicable
   to common stock                      $76.1          $26.9        $(64.3)        $(2.8)         $3.3       $(12.8)          $26.4
- -----------------------------------------------------------------------------------------------------------------------------------
Other information -
   Total assets (2)                  $2,640.7       $3,162.4        $199.0         $97.6        $241.0       $114.7        $6,455.4
   Subsidiary's investment in
      equity method investees              -              -             -            9.8         192.4           -            202.2
   Total expenditures for additions
      to long-lived assets               50.1          100.5            -             -             -           3.0           153.6
- -----------------------------------------------------------------------------------------------------------------------------------
Corporate Measures -
   Contribution margin (3)             $102.5          $53.8        $(63.4)        $(2.8)         $3.3        $(9.5)          $83.9
   Cash flow (4)                         60.2         (138.8)       (132.7)         (4.6)         21.5         87.3          (107.1)
   Return on net invested capital (5)     N/A            N/A           N/A           N/A           N/A          N/A             N/A


(1)  Intersegment  revenue priced at 2.9 cents per kwh  delivered.  Intersegment
     expense is reflected in other operating expenses for Customer Service. Both
     intersegment  revenue and  expenses  were  eliminated  for  purposes of the
     Consolidated Statements of Income.
(2)  Asset balances recorded by the business groups are significantly  different
     in 1999 due to the  impact  of the  impairment  and  write-off  of  nuclear
     generation, fair market valuation of fossil generation and recording of the
     regulatory asset to the Customer Service Business Group.
(3)  Contribution  margin  represented  by net  income  before  financing  costs
     (net-of-tax) and preferred dividend requirement.
(4)  Cash flow before financing activities.
(5)  Return on net invested capital is no longer a corporate measure in 1999.

                                       23




Illinova Corporation
Six Months Ended June 30, 1998                                           (Millions of Dollars)

                                                                                Illinova
                                       Customer     Wholesale                    Energy        Illinova      Other          Consoli-
                                       Service        Energy        Nuclear     Partners       Generating                     dated
1998
                                                                                                      
Revenues from external customers       $744.5         $209.0          $3.0        $   -          $  -         $  -           $956.5
Diversified enterprise revenue             -              -             -          161.3           3.4          1.5           166.2
Intersegment revenue (1)                   -           232.0          (1.2)           -             -            -            230.8
                                       --------------------------------------------------------------------------------------------
   Total Revenue                        744.5          441.0           1.8         161.3           3.4          1.5         1,353.5
Depreciation and amortization
   expense                               33.8           14.9          49.5            -             -           3.0           101.2
Other operating expenses (1)            454.3          435.6         168.4         168.1           8.9          4.4         1,239.7
                                       --------------------------------------------------------------------------------------------
   Operating income (loss)              256.4           (9.5)       (216.1)         (6.8)         (5.5)        (5.9)           12.6
Interest expense                         26.5            8.6          32.3            -             -           5.1            72.5
AFUDC                                    (0.6)          (0.7)         (0.9)           -             -          (0.1)           (2.3)
                                       --------------------------------------------------------------------------------------------
   Income (loss) before taxes           230.5          (17.4)       (247.5)         (6.8)         (5.5)       (10.9)          (57.6)
Income tax expense (benefit)             94.4          (10.0)       (106.2)         (1.7)         (1.3)        (8.5)          (33.3)
Miscellaneous - net                       0.3            0.6            -           (0.1)         (0.2)        (0.5)            0.1
Equity earnings in affiliates              -              -             -           (2.4)         (6.5)          -             (8.9)
Interest revenue                           -              -             -             -             -          (1.4)           (1.4)
                                       --------------------------------------------------------------------------------------------
   Net income (loss) after taxes        135.8           (8.0)       (141.3)         (2.6)          2.5         (0.5)          (14.1)
Preferred dividend requirement            3.5            1.3           5.0            -             -           0.1             9.9
                                       --------------------------------------------------------------------------------------------
Net income (loss) applicable
   to common stock                     $132.3          $(9.3)      $(146.3)        $(2.6)         $2.5        $(0.6)         $(24.0)
- -----------------------------------------------------------------------------------------------------------------------------------
Other information -
   Total assets                      $1,796.3         $715.6      $2,771.7         $53.1        $199.3       $102.9        $5,637.9
   Subsidiary's investment in
      equity method investees              -              -             -            9.6         173.8           -            183.4
   Total expenditures for additions
      to long-lived assets               60.9           27.4          26.2            -             -           2.8           117.3
- -----------------------------------------------------------------------------------------------------------------------------------
Corporate Measures -
   Contribution margin (2)             $149.0          $(5.5)      $(122.6)        $(2.6)         $2.5         $2.2           $23.0
   Cash flow (3)                        126.9          121.2        (152.0)          3.5           3.0         19.1           121.7
   Return on net invested capital (4)    11.5%          -1.4%          N/A           7.4%          1.3%         N/A             0.6%


(1)  Intersegment  revenue priced at 2.5 cents per kwh  delivered.  Intersegment
     expense is reflected  in other  operating  expenses  for Customer  Service.
     Nuclear  reflects a  replacement  power expense for the increment of market
     price over the intersegment  price. Both intersetment  revenue and expenses
     were eliminated for purposes of the Consolidated Statements of Income.
(2)  Contribution  margin  represented  by net  income  before  financing  costs
     (net-of-tax),  preferred dividend  requirement.
(3)  Cash flow before financing activities.
(4)  Return on net invested capital calculated as contribution margin divided by
     net invested capital.

                                       24


ILLINOVA GEOGRAPHIC INFORMATION

(Millions of dollars)
- --------------------------------------------------------------------------------
Year-To-Date June 30,                    1999          1998
- --------------------------------------------------------------------------------
Revenues: (1)
     United States                     $1,019.1     $1,120.6
     Foreign countries (Seven)              8.6          2.1
                                       --------     --------
                                       $1,027.7     $1,122.7
                                       ========     ========


(Millions of dollars)
- --------------------------------------------------------------------------------
June 30,                                 1999        1998
- --------------------------------------------------------------------------------
Long-lived assets: (2)
     United States                     $4,507.5    $4,601.7
     Foreign countries (Nine)             161.8       132.2
                                       --------    --------
                                       $4,669.3    $4,733.9
                                       ========    ========

(1)  Revenues  are  attributed  to  geographic  regions  based  on  location  of
     customer.
(2)  Long-lived   assets   include   plant,   equipment,   and   investments  in
     subsidiaries.


IP - SEGMENTS OF BUSINESS

IP comprises  five  business  groups.  The business  groups and their  principal
services are as follows:

o    IP Customer Service Business Group - transmission,  distribution,  and sale
     of electric energy; distribution,  transportation,  and sale of natural gas
     in Illinois.
o    IP Wholesale Energy Business Group - fossil-fueled  electric  generation in
     Illinois,  wholesale electricity transactions throughout the United States,
     and dispatching activities.
o    IP Nuclear Generation  Business Group - nuclear-fueled  electric generation
     in Illinois.
o    IP  Financial   Business  Group  -  financial  support  functions  such  as
     accounting,  finance, corporate performance, audit and compliance, investor
     relations,  legal, corporate development,  regulatory, risk management, and
     tax services.
o    IP  Support  Services  Business  Group  -  specialized  support  functions,
     including information technology, human resources, environmental resources,
     purchasing and materials management, and public affairs.

Of the above-listed segments, the IP Financial Business Group and the IP Support
Services  Business  Group  did  not  individually  meet  the  minimum  threshold
requirements for separate disclosure and are combined in the Other category.

In 1998,  three  measures were used to judge segment  performance:  contribution
margin, cash flow, and return on net invested capital. In 1999, two measures are
used to judge segment  performance;  contribution margin and cash flow. Omission
of return on net  invested  capital  provides for  increased  focus on near-term
financial needs.

                                       25





Illinois Power
Three Months Ended June 30, 1999                                                          (Millions of Dollars)

                                                              Customer         Wholesale                                 Total
1999                                                          Service           Energy       Nuclear        Other       Company
                                                                                                         
Revenues from external customers                               $320.8           $51.8         $5.5          $ -          $378.1
Intersegment revenue (1)                                           -            118.9         37.2            -           156.1
                                                             ------------------------------------------------------------------
  Total Revenue                                                 320.8           170.7         42.7             -          534.2
Depreciation and amortization expense                            23.7            25.7          1.6           0.1           51.1
Other operating expenses (1)                                    209.8           135.3         59.6           5.1          409.8
                                                             ------------------------------------------------------------------
  Operating income (loss)                                        87.3             9.7        (18.5)         (5.2)          73.3
Interest expense                                                 19.3            21.1          3.3           0.2           43.9
AFUDC                                                            (0.4)           (1.6)          -           (0.0)          (2.0)
                                                             ------------------------------------------------------------------
  Income (loss) before taxes                                     68.4            (9.8)       (21.8)         (5.4)          31.4
Income tax expense (benefit)                                     26.2            (4.3)        (7.5)          1.8           16.2
Miscellaneous-net                                                 0.2            (1.9)        (1.6)          0.1           (3.2)
Interest revenue                                                    -               -         (0.8)         (0.8)          (1.6)
                                                             ------------------------------------------------------------------
  Net income (loss) after taxes                                  42.0            (3.6)       (11.9)         (6.5)          20.0
Preferred dividend requirement and
  carrying amount over consideration
  paid for redeemed preferred stock                               2.6             2.8         (0.7)          0.3            5.0
                                                             ------------------------------------------------------------------
Net income (loss) applicable to common stock                   $ 39.4          $ (6.4)     $ (11.2)       $ (6.8)        $ 15.0
- -------------------------------------------------------------------------------------------------------------------------------
Other information -
  Total assets (2)                                           $2,640.7        $3,162.4       $199.0        $ 36.3       $6,038.4
  Total expenditures for additions
  to long-lived assets                                           27.2            86.0            -           2.1          115.3
Corporate Measures -
  Contribution margin (3)                                      $ 52.5           $ 7.1      $ (10.0)       $ (6.4)        $ 43.2
  Cash flow (4)                                                  18.1           (51.2)       (26.4)          5.2          (54.3)
  Return on net invested capital (5)                              N/A             N/A          N/A           N/A            N/A
- -------------------------------------------------------------------------------------------------------------------------------



(1)  Intersegment  revenue  priced  at 2.9  cents  per kwh  delivered  for 1999.
     Intersegment  expense is reflected in other operating expenses for Customer
     Service.  Both  intersegment  revenue and  eexpenses  were  eliminated  for
     purposes of the Consolidated Statements of Income.
(2)  Asset balances recorded by the business groups are significantly  different
     in 1999 due to the  impact  of the  impairment  and  write-off  of  nuclear
     generation, fair market valuation of fossil generation and recording of the
     regulatory asset to the Customer Service Business Group.
(3)  Contribution  margin  represented  by net  income  before  financing  costs
     (net-of-tax) and preferred dividend requirement.
(4)  Cash flow before financing activities.
(5)  Return on net invested capital is no longer a corporate measure in 1999.

                                       26





Illinois Power
Three Months Ended June 30, 1998                                                           (Millions of Dollars)

                                                          Customer       Wholesale                                   Total
1998                                                      Service         Energy        Nuclear        Other        Company
                                                                                                          
Revenues from external customers                               $352.9         $ 112.7        $ 1.4          $ -          $467.0
Intersegment revenue (1)                                           -            120.2         (0.6)          0.0          119.6
                                                             ------------------------------------------------------------------
  Total Revenue                                                 352.9           232.9          0.8           0.0          586.6
Depreciation and amortization expense                            16.9             7.5         24.7           1.4           50.5
Other operating expenses (1)                                    209.6           284.9         84.4           3.6          582.5
                                                             ------------------------------------------------------------------
  Operating income (loss)                                       126.4           (59.5)      (108.3)         (5.0)         (46.4)
Interest expense                                                  9.4             2.9         10.8          10.2           33.3
AFUDC                                                            (0.3)           (0.3)        (0.5)         (0.1)          (1.2)
                                                             ------------------------------------------------------------------
  Income (loss) before taxes                                    117.3           (62.1)      (118.6)        (15.1)         (78.5)
Income tax expense (benefit)                                     48.0           (26.7)       (50.9)         (5.4)         (35.0)
Miscellaneous-net                                                 0.3            (1.2)          -           (0.2)          (1.1)
Interest revenue                                                   -               -            -           (1.8)          (1.8)
                                                             ------------------------------------------------------------------
  Net income (loss) after taxes                                  69.0           (34.2)       (67.7)         (7.7)         (40.6)
Preferred dividend requirement                                    1.7             0.6          2.5           0.2            5.0
                                                             ------------------------------------------------------------------
Net income (loss) applicable to common stock                   $ 67.3         $ (34.8)     $ (70.2)       $ (7.9)        $(45.6)
- -------------------------------------------------------------------------------------------------------------------------------
Other information -
  Total assets                                               $1,795.3         $ 715.6     $2,771.7        $ 66.4       $5,349.0
  Total expenditures for additions
    to long-lived assets                                         30.7            17.2         19.0           1.5           68.4
- -------------------------------------------------------------------------------------------------------------------------------
Corporate Measures -
  Contribution margin (2)                                      $ 73.4         $ (33.6)     $ (61.4)        $(2.1)        $(23.7)
  Cash flow (3)                                                  53.7            78.0        (70.4)        (21.3)          40.0
  Return on net invested capital (4)                              5.6%           -7.4%         N/A           N/A           -0.6%
- -------------------------------------------------------------------------------------------------------------------------------



(1)  Intersegment  revenue  priced  at 2.5  cents  per kwh  delivered  for 1998.
     Intersegment  expense is reflected in other operating expenses for Customer
     Service.  Nuclear reflects a replacement power expense for the increment of
     market  price  over the  intersegment  price  for 1998.  Both  intersegment
     revenue and  expenses  were  eliminated  for  purposes of the  Consolidated
     Statements of Income.
(2)  Contribution  margin  represented  by net  income  before  financing  costs
     (net-of-tax) and preferred dividend requirement.
(3)  Cash flow before financing activities.
(4)  For 1998, return on net invested capital calculated as contribution  margin
     divided by net invested capital.

                                       27


GEOGRAPHIC INFORMATION

(Millions of dollars)
- --------------------------------------------------------------------------------
Second Quarter                            1999         1998
- --------------------------------------------------------------------------------
Revenues: (1)
     United States                       $378.1        $467.0
                                         ======        ======

(Millions of dollars)
- --------------------------------------------------------------------------------
June 30,                                  1999         1998
- --------------------------------------------------------------------------------
Long-lived assets: (2)
     United States                     $4,442.2      $4,552.4
                                       ========      ========

(1)  Revenues  are  attributed  to  geographic  regions  based  on  location  of
     customer.
(2)  Long-lived   assets   include   plant,   equipment,   and   investments  in
     subsidiaries.

                                       28





Illinois Power
Six Months Ended June 30, 1999                                                     (Millions of Dollars)

                                                          Customer       Wholesale                                   Total
1999                                                      Service         Energy        Nuclear        Other        Company
                                                                                                         
Revenues from external customers                               $697.5         $ 145.9         $7.0          $ -          $850.4
Intersegment revenue (1)                                           -            254.8         36.5            -           291.3
                                                             ------------------------------------------------------------------
  Total Revenue                                                 697.5           400.7         43.5            -         1,141.7
Depreciation and amortization expense
                                                                 42.2            51.3          3.6            -            97.1
Other operating expenses (1)                                    485.1           261.9        149.0           6.2          902.2
                                                             ------------------------------------------------------------------
  Operating income (loss)                                       170.2            87.5       (109.1)         (6.2)         142.4
Interest expense                                                 38.6            41.0          4.0           0.1           83.7
AFUDC                                                            (0.8)           (2.4)          -             -            (3.2)
                                                             ------------------------------------------------------------------
  Income (loss) before taxes                                    132.4            48.9       (113.1)         (6.3)          61.9
Income tax expense (benefit)                                     50.6            18.0        (43.2)          2.4           27.8
Miscellaneous-net                                                 0.2            (1.8)        (2.1)         (0.3)          (4.0)
Interest revenue                                                   -               -          (1.9)         (3.0)          (4.9)
                                                             ------------------------------------------------------------------
  Net income (loss) after taxes                                  81.6            32.7        (65.9)         (5.4)          43.0
Preferred dividend requirement and
  carrying amount over (under)
  consideration paid for
  redeemed preferred stock                                        5.5             5.8         (1.6)         (0.5)           9.2
                                                             ------------------------------------------------------------------
Net income (loss) applicable to
common stock                                                   $ 76.1          $ 26.9      $ (64.3)       $ (4.9)        $ 33.8
- -------------------------------------------------------------------------------------------------------------------------------
Other information -
  Total assets (2)                                           $2,640.7        $3,162.4       $199.0        $ 36.3       $6,038.4
  Total expenditures for additions
  to long-lived assets                                           50.1           100.5           -            3.0          153.6
- -------------------------------------------------------------------------------------------------------------------------------
Corporate Measures -
  Contribution margin (3)                                      $102.5          $ 53.8      $ (63.4)       $ (5.3)        $ 87.6
  Cash flow (4)                                                  60.2          (138.8)      (132.7)         86.6         (124.7)
  Return on net invested capital (5)                              N/A             N/A          N/A           N/A            N/A
- -------------------------------------------------------------------------------------------------------------------------------



(1)  Intersegment  revenue  priced  at 2.9  cents  per kwh  delivered  for 1999.
     Intersegment  expense is reflected in other operating expenses for Customer
     Service.  Both  intersegment  revenue  and  expenses  were  eliminated  for
     purposes of the Consolidated Statements of Income.
(2)  Asset balances recorded by the business groups are significantly  different
     in 1999 due to the  impact  of the  impairment  and  write-off  of  nuclear
     generation, fair market valuation of fossil generation and recording of the
     regulatory asset to the Customer Service Business Group.
(3)  Contribution  margin  represented  by net  income  before  financing  costs
     (net-of-tax) and preferred dividend requirement.
(4)  Cash flow before financing activities.
(5)  Return on net invested capital is no longer a corporate measure in 1999.

                                       29




Illinois Power
Six Months Ended June 30, 1998                                                    (Millions of Dollars)

                                                          Customer       Wholesale                                   Total
1998                                                      Service         Energy        Nuclear        Other        Company
                                                                                                         
Revenues from external customers                               $744.5         $ 209.0        $ 3.0          $ -          $956.5
Intersegment revenue (1)                                           -            232.0         (1.2)          0.0          230.8
                                                             ------------------------------------------------------------------
  Total Revenue                                                 744.5           441.0          1.8           0.0        1,187.3
Depreciation and amortization expense
                                                                 33.8            14.9         49.5           3.0          101.2
Other operating expenses (1)                                    454.3           435.6        168.4           1.7        1,060.0
                                                              -----------------------------------------------------------------
  Operating income (loss)                                       256.4            (9.5)      (216.1)         (4.7)          26.1
Interest expense                                                 26.5             8.6         32.3            -            67.4
AFUDC                                                            (0.6)           (0.7)        (0.9)         (0.1)          (2.3)
                                                             ------------------------------------------------------------------
  Income (loss) before taxes                                    230.5           (17.4)      (247.5)         (4.6)         (39.0)
Income tax expense (benefit)                                     94.4           (10.0)      (106.2)         (6.0)         (27.8)
Miscellaneous-net                                                 0.3             0.6            -           0.1            1.0
Interest revenue                                                   -               -            -           (2.0)          (2.0)
                                                             ------------------------------------------------------------------
  Net income (loss) after taxes                                 135.8            (8.0)      (141.3)          3.3          (10.2)
Preferred dividend requirement                                    3.5             1.3          5.0           0.1            9.9
                                                             ------------------------------------------------------------------
Net income (loss) applicable to
  common stock                                                 $132.3           $(9.3)     $(146.3)        $ 3.2         $(20.1)
- -------------------------------------------------------------------------------------------------------------------------------
Other information -
  Total assets                                               $1,795.3         $ 715.6     $2,771.7        $ 66.4       $5,349.0
  Total expenditures for additions
    to long-lived assets                                         60.9            27.4         26.2           2.8          117.3
Corporate Measures -
  Contribution margin (2)                                      $149.0           $(5.5)     $(122.6)        $ 3.0         $ 23.9
  Cash flow (3)                                                 126.9           121.2       (152.0)         10.0          106.1
  Return on net invested capital (4)                             11.5%           -1.4%         N/A           N/A            0.7%
- -------------------------------------------------------------------------------------------------------------------------------



(1)  Intersegment  revenue  priced  at 2.5  cents  per kwh  delivered  for 1998.
     Intersegment  expense is reflected in other operating expenses for Customer
     Service.  Nuclear reflects a replacement power expense for the increment of
     market  price  over the  intersegment  price  for 1998.  Both  intersegment
     revenue and  expenses  were  eliminated  for  purposes of the  Consolidated
     Statements of Income.
(2)  Contribution  margin  represented  by net  income  before  financing  costs
     (net-of-tax) and preferred dividend requirement.
(3)  Cash flow before financing activities.
(4)  For 1998, return on net invested capital calculated as contribution  margin
     divided by net invested capital.

                                       30


GEOGRAPHIC INFORMATION

(Millions of dollars)
- --------------------------------------------------------------------------------
Year-To-Date June 30,                     1999        1998
- --------------------------------------------------------------------------------
Revenues: (1)
     United States                       $850.4       $956.5
                                         ======       ======

(Millions of dollars)
- --------------------------------------------------------------------------------
June 30,                                  1999        1998
- --------------------------------------------------------------------------------
Long-lived assets: (2)
     United States                     $4,442.2    $4,552.4
                                       ========    ========

(1)  Revenues  are  attributed  to  geographic  regions  based  on  location  of
     customer.
(2)  Long-lived   assets   include   plant,   equipment,   and   investments  in
     subsidiaries.

                                       31


              ILLINOVA CORPORATION AND ILLINOIS POWER COMPANY

                     MANAGEMENT'S DISCUSSION AND ANALYSIS OF
                  FINANCIAL CONDITION AND RESULTS OF OPERATIONS

        Certain   information   contained  in  this  report  is  forward-looking
information  based on  current  expectations  and plans that  involve  risks and
uncertainties.   Forward-looking   information  includes,  among  other  things,
statements  concerning the impact of regulatory  changes,  plans for the Clinton
facility,  and success in  addressing  Year 2000  issues;  as well as those that
include  the words  "expect,"  "intend,"  "predict,"  "estimate,"  "believe"  or
similar  language.  Although  Illinova  and  IP  believe  these  forward-looking
statements are accurate,  their  businesses are dependent on various  regulatory
issues,  general  economic  conditions and future trends,  and these factors can
cause actual results to differ  materially from the  forward-looking  statements
that have been made.

        The following factors,  in addition to those discussed elsewhere in this
report and in the Annual Report on Form 10-K for the fiscal year ended  December
31,  1998,  and  subsequent  securities  filings  could cause  results to differ
materially  from management  expectations  as suggested by such  forward-looking
statements:  the outcome of state and Federal regulatory  proceedings  affecting
the  restructuring  of the  electric and utility  industry;  the impact on IP of
current  regulations  providing  for rate  reductions  and the phasing in of the
opportunity  for some  customers to choose  alternative  energy  suppliers;  the
effects of  increased  competition  in the future due to,  among  other  things,
deregulation  of certain  aspects of IP's business at both the state and Federal
levels,  and the increasing  popularity of alternative  sources of  electricity,
such  as  co-generation  facilities;   the  effects  of  the  implementation  of
Illinova's  various  strategies  to best  respond to its  changing  business and
regulatory  environment,  including  potential  acquisitions,  focused growth of
unregulated  businesses and other options;  the fluctuating  electricity  supply
demands of IP customers,  which, if increased  beyond IP's generation  capacity,
might result in unplanned outages forcing IP to acquire  additional  supplies in
the  electricity   marketplace  at  uncertain  and  often  volatile  prices  and
availability;  changes  in prices  and costs of fuel;  various  financial  risks
attendant  to selling or shutting  down  Clinton;  ongoing  nuclear  operational
exposures  until  Clinton  is sold or shut down;  the effect of events  that can
occur  in  Illinova's  or  IP's  business  operations  or  in  general  economic
conditions,  that could negatively impact its financial flexibility and costs of
financing;  the impact of the sale or  shutdown  of  Clinton on IP's  ability to
issue  indebtedness  under  its  existing  mortgages;   the  impact  of  current
environmental  regulations on utilities and the expectation  that more stringent
requirements  will be introduced over time,  which are likely to have a negative
financial effect;  various factors affecting  non-utility  investments,  such as
IGC's  investments  in  foreign   countries,   which  are  subject  to  currency
fluctuations, cyclical and sustained economic downturns and political risks; the
inherent risks of active purchases and sales by Illinova, through IEP and IP, of
electricity  and natural gas futures and similar  contracts;  and the ability of
Illinova and IP, their vendors and others to manage Year 2000 issues.

        All  forward-looking  statements in this report are based on information
that  currently is available.  Illinova and IP disclaim any obligation to update
any forward-looking statement.

                                       32


ILLINOVA SUBSIDIARIES

        IP, a subsidiary of Illinova,  engages in the generation,  transmission,
distribution  and sale of electric energy and the  distribution,  transportation
and  sale of  natural  gas in the  State of  Illinois.  IP has  publicly  traded
preferred shares outstanding but its common stock is wholly-owned by Illinova.

        IGC is Illinova's wholly-owned independent power subsidiary. IGC invests
in energy supply  projects  throughout the world and competes in the independent
power  market.  IGC's  strategy is to invest in and develop  "greenfield"  power
plants,   acquire  existing  generation   facilities  and  provide  power  plant
operations and maintenance.

        IEP is a wholly-owned  subsidiary of Illinova.  IEP develops and markets
energy-related products and services to the unregulated energy market throughout
the United  States and Canada and  engages in the  brokering  and  marketing  of
electric power and gas.

        IIC is a  wholly-owned  subsidiary  of Illinova  and was licensed by the
State of Vermont as a captive insurance company.  The primary business of IIC is
to insure certain risks of Illinova and its subsidiaries.

        IBE is a wholly-owned  subsidiary of Illinova and was created to account
for  miscellaneous  business  activities not regulated by the ICC or the Federal
Energy Regulatory Commission (FERC) and not falling within the business scope of
other Illinova subsidiaries.

        Illinova Power  Marketing,  Inc. (IPMI) is a wholly-owned  subsidiary of
Illinova  created in April 1999,  to become the wholesale  generation  and power
marketing  company to which IP's fossil  generating  assets will be transferred.
The ICC  approved  the  transfer of  generation  assets to IPMI on July 8, 1999.
Other  required  regulatory  approvals  for the transfer of these assets and for
IPMI's marketing activities are being sought.


MERGER AGREEMENT

        On June 14,  1999,  Illinova  and Dynegy  Inc.  (Dynegy)  announced  the
execution  of a  definitive  agreement  for the merger of  Illinova  and Dynegy,
creating  a  full  service  provider  of  energy  products  and  services.   The
combination  brings  together   Illinova's   strategically   positioned  Midwest
generating  facilities and developing national energy services and products with
Dynegy, a leading marketer of energy products and services in the country.  Both
Illinova and Dynegy are leading independent power developers and producers.  The
combined  company is  expected  to own more than  15,000  megawatts  of domestic
generating  capacity,  representing  the  world's  most  geographically  diverse
generating asset portfolio.

        Under terms of the merger agreement,  which were approved unanimously by
each  company's  board  of  directors  and  agreed  to  by  Dynegy's  industrial
shareholders (who  collectively own  approximately  76% of Dynegy's  outstanding
common stock), a newly established parent company will acquire all of the shares
of Dynegy  and  Illinova  for a  combination  of stock and cash,  subject to the
satisfaction of certain pre-closing conditions. The merger is conditioned, among
other  things,  upon  the  completion  of the  pending  sale of the  Clinton  by
Illinova,  the  approvals  of the  FERC,  the SEC,  the ICC,  Illinova's  common
stockholders and the expiration or termination of the Hart-Scott-Rodino  waiting
period. The merger is expected to close by the end of the first quarter of 2000.

        Upon closing,  Chuck  Watson,  Chairman and Chief  Executive  Officer of
Dynegy,  will  retain  that  title in the  combined  company.  Charles  Bayless,
Chairman,  President and Chief Executive Officer of Illinova, will continue as a

                                       33


non-executive  director of the combined  company.  The Board of Directors of the
combined  company,  which will be incorporated in Illinois and  headquartered in
Houston,  Texas, will consist of seven members of the current Illinova Board and
seven members of the current Dynegy Board,  including three designees of Chevron
U.S.A.,  which currently owns an approximate 25% interest in Dynegy.  Illinova's
regulated utility, IP, will be a subsidiary and remain headquartered in Decatur,
IL.

        Various  details  regarding the merger are  discussed  more fully in the
Form S-4 filed by Energy  Convergence  Holding  Company on August 11, 1999,  SEC
File No. 333-84965, which is incorporated herein by reference.

DIVERSIFIED BUSINESS ACTIVITIES

        In February 1999, IEP, a wholly-owned subsidiary of Illinova,  purchased
the  Indiana-based  natural gas  management  operations  of Equitable  Resources
Marketing  Company.  Equitable  Resources  Marketing  (ERM) was a subsidiary  of
Equitable Resources,  Inc., (ERI) of Pittsburgh, PA. ERI is an integrated energy
company that produces, markets, and distributes natural gas and oil.

        In April 1999,  IEP also  purchased  Quality  Energy  Services  (QES), a
Tempe, Arizona based natural gas marketing company.

        In May 1999,  IEP  purchased  the Chicago,  IL based  holdings of Energy
Dynamics, Inc., (EDI) an independent natural gas marketing firm based in Rolling
Meadows, IL.

        The 1998 combined  revenues of ERM, QES, and EDI were  approximately $67
million.


LIQUIDITY AND CAPITAL RESOURCES
     CAPITAL RESOURCES AND REQUIREMENTS

        Cash  flows  from  operations  during  the  first  six  months  of 1999,
supplemented  by external  financing and cash on hand,  were  sufficient to meet
ongoing  operating  requirements  and to service  existing  common and preferred
stock  dividends,   debt  requirements,   IP's  construction   requirements  and
Illinova's investments in its subsidiaries.  However,  Illinova and IP liquidity
has  decreased  as  compared  to June 30,  1998,  as a result of  higher  fossil
maintenance  costs,  increased  marketing  expenses,  and higher  Clinton  costs
combined with lower revenues attributable to the rate reduction mandated by P.A.
90-561.

        Illinova  expects to use future  operating cash flows,  supplemented  by
external  financing,  to meet operating  requirements and to continue to service
existing  debt,  IP's  preferred  and  Illinova  common  stock  dividends,   and
Illinova's  and  IP's  anticipated   subsidiary   investments  and  construction
requirements for the remainder of 1999.

        Illinova  currently has authority to issue an additional $130 million in
debt securities under an existing $300 million shelf registration. Illinova also
has in place a $130 million  Revolving Credit Agreement.  However,  covenants in
the  Illinova  Revolving  Credit  Facility  limit  total  Illinova  debt to $350
million.  At June 30, 1999 $40.5  million of new debt  capacity  was  available.
Prior to  1999,  IP paid  Illinova  dividends  on the IP  common  stock  held by
Illinova to provide  Illinova cash for operations.  IP is limited in its payment
of dividends by the Illinois  Public  Utilities  Act,  which  requires  retained
earnings  equal  to  or  greater  than  the  amount  of  any  proposed  dividend
declaration  or  payment,   and  by  the  Federal  Power  Act,  which  precludes
declaration or payment of dividends by electric utilities "out of money properly
stated in a capital  account." In the first  quarter of 1999, IP did not declare
or pay  dividends  on its common  stock.  In June 1999,  IP declared  and paid a

                                       34


common stock dividend of $19.5 million.  Based on the Board's  current  dividend
policy,  management  expects IP's retained  earnings to be sufficient to support
Illinova common  dividends.  IP also is allowed to  periodically  repurchase its
common stock from  Illinova in  accordance  with  authority  granted by the ICC,
contingent on IP meeting  certain cash flow tests. IP currently does not satisfy
this cash  flow test and it is  anticipated  that it will not  satisfy  the test
throughout 1999. This test would not interfere with the repurchases,  if any, of
Illinova  equity  shares  using  securitization  proceeds.   Illinova's  current
capacity under the existing  revolving credit  agreement and shelf  registration
should meet its cash  requirements  through the third quarter of 1999.  Illinova
and IGC are developing additional financing capabilities to meet future needs.

        From the  beginning of 1999,  through July 16, 1999,  IP redeemed  $57.1
million  of 8.75%  First  Mortgage  Bonds due 2021,  $229  million  of 8.00% New
Mortgage  Bonds due 2023,  $22.9 million of 7.95% First Mortgage Bonds due 2004,
$36.8 million of 6.50% First  Mortgage  Bonds due 1999,  $39.85 million of 7.50%
New  Mortgage  Bonds due 2025,  along  with  154,900  shares of  Monthly  Income
Preferred Securities (MIPS) and 154,295 shares of various serial preferred stock
series.  These securities were retired using funds from securitization  proceeds
received in December 1998.

        On July 20, 1999,  Illinois  Power's 1943 mortgage (First  Mortgage) was
retired.  All remaining  First  Mortgage debt was  substituted  with debt issued
under the 1992 Mortgage (New Mortgage) or defeased.  New Mortgage Bonds of $35.6
million with a coupon rate of 7.5% due 2024 (Series K) and $84.2  million with a
coupon  rate of 7.4% due 2024  (Series L) were  substituted  for First  Mortgage
Bonds  with  identical  terms and  amounts  (replacement  Series U and V).  With
proceeds received from the December 1998  securitization  issuance,  IP defeased
$35.2  million of 6.50% First  Mortgage  Bonds due 1999,  $16.1 million of 7.95%
First  Mortgage  Bonds due 2004 and $84.7 million of 7.375% First Mortgage Bonds
due 2021.

        IP's capital  requirements  for  construction  were  approximately  $150
million  and $115  million  during the six months  ended June 30, 1999 and 1998,
respectively.  Through 2000, IP plans to complete improvements in its generation
facilities  including  pollution control  equipment.  Illinova estimates that it
will spend approximately $380 million for IP construction  expenditures in 1999.
IP  construction  expenditures  for  1999  through  2003 are  expected  to total
approximately  $1.4  billion.  In light of the  December  1998  decision to exit
Clinton and the resulting Clinton impairment,  Clinton capital  expenditures are
expensed as incurred  and are not included in the above  estimates.  On March 2,
1999, in accordance  with a lease agreement  between IP and IP Fuel Company,  IP
paid $62.1 million for partially depleted nuclear fuel in the Clinton reactor to
IP Fuel  Company as a result of Clinton  Nuclear  Station  failing to restart by
January 31, 1999.  The liability for the nuclear fuel was accrued as of December
31, 1998. As part of the Clinton  impairment  entries at year end,  nuclear fuel
was written down to the expected consumption through August 31, 1999.

        Additional   expenditures   may  be  required   during  this  period  to
accommodate   the  transition  to  a  competitive   environment,   environmental
compliance,  system upgrades, and other costs which cannot be determined at this
time.

        In  addition  to  IP  construction   expenditures,   Illinova's  capital
expenditures  for 1999  through  2003 are  expected to include  $520 million for
mandatory debt retirement.  In addition,  IPSPT has long-term debt maturities of
$86.4 million in each of the above years.

        On June 29, 1999, IP issued $250 million of Mortgage Bonds due 2009 with
an interest rate of 7.50%.  Proceeds were used to reduce outstanding  short-term
borrowings.  IP currently  has the authority to issue $500 million in short-term
debt,  which includes $354 million in committed  bank lines of credit.  Of these

                                       35


authorized  amounts, IP had $347 million at June 30, 1999, in remaining capacity
that may be utilized to issue  commercial  paper and extend floating rate notes.
IP   anticipates   that  this  liquidity  will  be  sufficient  to  address  its
requirements  into the  fourth  quarter  of 1999.  IP is  developing  additional
financial capabilities to meet future needs.

        Following the merger  announcement,  several rating  agencies  responded
with favorable outlooks on IP and Illinova credit quality. Standard & Poor's has
changed its outlook from stable to positive, and presently rates ILN at BBB- and
IP at BBB. Duff & Phelps has placed IP on Credit Watch-Up, with a present rating
of BBB+.  Moody's,  which rates IP bonds at Baal and ILN notes at Baa3, affirmed
its present ratings.


ACCOUNTING MATTERS

        For further  information on accounting issues, see "Accounting  Matters"
under  "Regulatory  and Legal Matters" of the "Notes to  Consolidated  Financial
Statements" on page 15 of this report.


CLINTON POWER STATION

        In  September  1996,  a leak in a  recirculation  pump  seal  caused  IP
operations  personnel to shut down Clinton.  Clinton returned to service May 27,
1999.

        The prolonged  outage at Clinton has had an adverse effect on Illinova's
and IP's financial  condition,  through  higher  operating and  maintenance  and
capital costs, lost  opportunities to sell energy,  and replacement power costs.
In addition,  in March 1999, due to the failure of Clinton to restart by January
31,  1999, a provision  in the lease  agreement  between IP and the Fuel Company
required IP to pay $62.1 million cash for the  acquisition of core fuel in March
1999, to the Fuel Company  Trustee for the benefit of investors in secured Notes
of the Fuel Company.


PECO AND AMERGEN AGREEMENT

        On April 15, 1999, IP announced that it had reached an interim agreement
with AmerGen  Energy  Company  (AmerGen),  whereby  AmerGen  would  purchase and
operate Clinton and IP would buy at least 75 percent of the plant's  electricity
output for the next  several  years.  AmerGen is  jointly  owned by PECO  Energy
Company  (PECO),  and British  Energy.  IP also announced on April 15, 1999, the
execution  of a  revised  management  agreement  (Agreement)  with  PECO for the
operation of Clinton retroactive to April 1, 1999.

        On July 1, 1999,  IP  announced  that it had signed a  definitive  asset
purchase  agreement  with AmerGen.  Basic terms for the sale remain  essentially
unchanged  from the  framework  proposed  in the  interim  agreement.  The asset
purchase  agreement,  signed June 30, 1999,  provides  that IP will  purchase at
fixed  prices,  at least 75  percent  of  Clinton's  electricity  output for its
customers  through  2004 at fixed  prices  which exceed  current  and  projected
wholesale prices.

        Terms of the interim agreement between PECO and IP will remain in effect
until the transaction  closes.  Specifically,  PECO is responsible for Clinton's
direct  operating and capital expenses and continues to manage the station under
the existing  management  contract,  while IP  compensates  PECO for  management
services  based  on  the  amount  of  electricity  the  station  produces.  This
eliminates IP's exposure to the uncertainty  regarding the costs associated with
Clinton's  operations.  In return for  transferring  this financial risk, IP has
agreed to pay PECO a management  fee  calculated  by  multiplying a fixed dollar
amount per MWH times 80 percent of the  electricity  generated at Clinton during

                                       36


the  interim  period and to allow PECO to retain 20 percent of power  generation
for its  own  use at no  cost.  The  financial  impact  of  this  obligation  is
contingent on two variables:  (1) the capacity levels at which Clinton  operates
and (2) the prices at which the electricity can be sold from time to time. Based
on the terms of the  revised  management  agreement,  the fees  payable  to PECO
during the interim period could equal or exceed the 1999 Clinton-related O&M and
capital  costs for which PECO assumed full  responsibility  commencing  April 1,
1999.

        Under terms of the definitive asset purchase agreement, AmerGen will pay
up to $20 million for the plant and property and will assume full responsibility
and liability for operating and ultimately  decommissioning the nuclear station.
IP will transfer to AmerGen the existing  decommissioning  trust funds, expected
to total  approximately  $95  million  at the end of  1999.  IP will  also  make
additional payments to the decommissioning trust funds intended to be sufficient
to provide for the actual  decommissioning  of Clinton by 2026, when the plant's
operating license is scheduled to expire. These payments may be in the form of a
single  payment of $145 million at closing,  one payment of $124.2  million plus
five annual  payments of $5 million,  or the  provision of an  insurance  policy
purchased by IP.

        Approvals must be obtained from various  regulatory  agencies  including
the NRC, the ICC, and the FERC.  Approvals  for transfer of permits and licenses
must be granted by  numerous  agencies,  including  the  Illinois  Environmental
Protection  Agency,  the Illinois  Department  of Nuclear  Safety,  the Illinois
Department of Natural  Resources,  and others.  Until all approvals are obtained
and the parties  close on the sale, IP will continue to maintain the license for
Clinton's operation and retain the ultimate operating authority over the plant.


REGULATORY MATTERS

     FOSSIL GENERATION FILING

        On July 8, 1999,  the ICC  unanimously  approved IP's filing to sell its
fossil generating assets to Illinova. Subsequently, Illinova intends to transfer
those assets to its wholly owned  subsidiary  IPMI. IPMI, which was incorporated
in April 1999, will become a wholesale  generation and power marketing  company.
On June 11, 1999, IP made a Part 205 filing with the FERC seeking  approval of a
proposed Power Purchase  Agreement  between IP and IPMI. IP also filed a request
with the FERC, on June 29, 1999, seeking approval for asset transfer. A response
to both filings by the FERC is anticipated in the third quarter of 1999.


     ATTORNEY GENERAL COMPLAINT

        On July 17,  1998,  a  complaint  against IP was filed at the ICC by the
Illinois State Attorney  General.  The complaint  alleges that IP failed to meet
its statutory obligations to provide adequate and reliable service in connection
with last summer's electric supply situation (for further disclosure, see "Power
Supply and  Reliability"  on page 42).  It asks the ICC to conduct a  management
audit of IP and seeks an order  requiring IP to offer  compensation to customers
for voluntary conservation and service  interruptions.  The company provided the
Attorney General with a reliability report. The Attorney General and the Company
agreed on an independent  committee of two outside experts to review the report.
In June, the Attorney  General and IP signed a settlement  agreement in which IP
agrees to provide three annual updates to the reliability report it submitted in
response to the complaint,  and agrees to maintain and in some cases  moderately
enhance  existing systems and maintenance  practices.  The parties filed a joint
motion to dismiss the  complaint on the basis of this  agreement,  which the ICC
unanimously  approved on July 28, 1999. There are no significant costs resulting

                                       37


from  the   agreement.   Although   there  were  limited   calls  for  voluntary
conservation,  and  interruptible  customers  were  curtailed,  no firm load was
interrupted or curtailed during 1998.


     SOYLAND POWER COORDINATION AGREEMENT

        In March 1999, Soyland and IP signed a new Power Coordination  Agreement
(PCA) and  filed  this  agreement  with the FERC.  The new  agreement  no longer
obligates IP to provide  capacity and energy to Soyland with the  exception of a
small amount of capacity for the purpose of supplying  Soyland's load within the
IP Control Area.  Therefore,  the new PCA triggered the immediate recognition of
deferred  revenue  from the previous  Soyland  prepayment  of the base  capacity
charge.  This resulted in an increase in interchange  revenues of $61 million in
the first quarter of 1999.


     UNIFORM FUEL ADJUSTMENT CLAUSE (UFAC)

        Prior to March  1998,  the  costs of fuel for  electric  generation  and
purchased power costs were deferred and recovered from customers pursuant to the
UFAC. On March 6, 1998, IP initiated an ICC  proceeding to eliminate the UFAC in
accordance  with  P.A.  90-561.  A new base  fuel cost  recoverable  under  IP's
electric  tariffs was  established,  effective  on the date of the filing.  UFAC
elimination prevents IP from automatically passing cost increases through to its
customers and exposes IP to the risks and opportunities of cost fluctuations and
operating efficiencies.

        Under UFAC, IP was subject to annual ICC audits of its actual  allowable
fuel  costs.  Costs  could  be  disallowed,  resulting  in  negotiations  and/or
litigation  with the ICC. In 1998, IP agreed to  settlements  with the ICC which
closed  the  audits  for all  previously  disputed  years.  As a  result  of the
settlements,  IP electric customers received refunds totaling $32 million during
the first six months of 1999.  These refunds complete the process of eliminating
the UFAC at IP.


     DEREGULATION RULEMAKINGS AND TARIFFS

        The Illinois Public Utilities Act was significantly  modified in 1997 by
P.A.  90-561,  but the ICC  continues  to have broad powers of  supervision  and
regulation  with  respect  to the rates and  charges  of IP,  its  services  and
facilities,  extensions or abandonment of service,  classification  of accounts,
valuation and depreciation of property, issuance of securities and various other
matters.  Before a significant plant addition may be included in IP's rate base,
the ICC must determine that the addition is reasonable in cost, prudent and used
and useful in  providing  utility  service to  customers.  IP must  continue  to
provide  bundled retail  electric  service to all who choose to continue to take
service at tariff rates,  and IP must provide  unbundled  electric  distribution
services  to all  eligible  customers  as defined by P.A.  90-561 at rates to be
determined  by the ICC.  During  1998,  pursuant  to  authority  granted in P.A.
90-561,  the ICC issued  rules  associated  with (i)  transactions  between  the
utility  and its  affiliates;  (ii)  service  reliability;  (iii)  environmental
disclosure; and (iv) alternative retail electric supplier certification criteria
and  procedures.  During 1999,  it is expected that the ICC will rule on (i) the
rates  and  terms  associated  with  the  provision  of  delivery  services  for
commercial and industrial  customers;  (ii) establishing the neutral fact finder
price  utilized in (a)  calculating  competitive  transition  costs and (b) IP's
power purchase tariff;  (iii) the competitive  transition cost methodology;  and
(iv)  guidelines  regarding  standards of conduct and functional  separation.  A
proceeding  will be opened in September  1999 to address the issue of unbundling
billing,  metering,  and customer  handling with a final decision to be rendered

                                       38


prior to the third quarter of the year 2000. The final order on delivery service
tariffs is expected in August of 1999.

        Under the new rules,  Illinois  utilities must keep records  identifying
service interruptions experienced by each customer. Illinois utilities must also
file an annual report  detailing the  reliability  of its service and explaining
its plans for  reliability  improvements.  In  addition,  each utility must also
report the number  and causes of service  interruptions  that were due to causes
within the utility's  control.  Outage targets were  established  for service to
individual customers and for system performance.

        The extent to which revenues are affected by P.A.  90-561 will depend on
a number of factors  including  future  market  prices for  wholesale and retail
energy,  load growth and demand levels in the current IP service territory,  and
success in marketing to customers outside IP's existing service  territory.  The
impact on net income will depend on, among other things,  the amount of revenues
earned and the cost of doing business.

     OPEN TRANSMISSION ACCESS AND COMPETITION

        In January 1998, IP, in conjunction with eight other transmission-owning
entities,  filed  with  the FERC  for all  approvals  necessary  to  create  and
implement the Midwest Independent  Transmission System Operator, Inc. (MISO). On
September 16, 1998, the FERC issued an order authorizing the creation of a MISO.
The MISO has elected a seven-person independent board of directors. The goals of
this  joint  undertaking  are to:  1) put in  place a tariff  allowing  easy and
nondiscriminatory  access to transmission facilities in a multi-state region, 2)
enhance   regional   reliability  and  3)  establish  an  entity  that  operates
independently of any transmission  owner(s) or other market  participants,  thus
furthering  competition in the wholesale  generation  market consistent with the
objectives  of the  FERC's  Order  No.  888.  Since  January  1998,  four  other
transmission-owning  entities  joined  the  MISO.  Participation  in an  ISO  by
utilities  serving  retail  customers  in Illinois  was one of the  requirements
included in P.A. 90-561, enacted in 1997. The MISO has a stated goal to be fully
operational by January 1, 2001.

        See "Open Access and Competition"  under  "Regulatory and Legal Matters"
of the "Notes to  Consolidated  Financial  Statements" on page 14 of this report
for additional information.


YEAR 2000 DATA PROCESSING

        Passing  from  1999 into  2000  creates  a risk that  computer-dependent
processes will fail because the date will be read as "1900."  Illinova began its
Year 2000 (Y2K) project in November 1996. The project scope  encompasses  all of
Illinova's  subsidiaries  including  IP,  IGC,  and IEP. A central  organization
provides overall project  guidance and  coordination  among the business groups,
meeting monthly to share information,  conducting internal project reviews,  and
producing  monthly  status  reports  to  all  levels  of  Illinova   management.
Bi-monthly  Year 2000  readiness  reports are provided to the Illinova  Board of
Directors.

        The Year 2000  project  involves  evaluation  and  testing of  software,
hardware,  and business  processes,  including  mainframe and personal  computer
software  and  hardware,  process  computer  software  and  hardware,  end  user
computing,  telecommunications and networks, vendor purchased packages, embedded
systems, facility control systems, vendors/supplies, financial institutions, and
electronic interfaces with outside agencies.

        The project is divided into two focus areas.  The first focus area deals
with information technology (IT) software,  hardware,  and infrastructure.  This

                                       39


includes such items as the billing  system,  payroll  system,  accounts  payable
system, personal computers, telecommunications, networks, and mainframes.

        The second focus area targets non-IT  operational  systems and processes
which  encompass  most of the systems and business  processes  actually  used to
deliver  electricity and gas to customers.  This is also the area where embedded
systems  and  microprocessors  are found.  Included in this focus area are power
plant  facilities,  transportation  systems  such as railways  and barges,  fuel
suppliers,   electric  and  gas  transmission   and   distribution   facilities,
substations  and  transformers,  meters,  building  systems  such  as  HVAC  and
security, and financial institutions.

        The overall status of Illinova's Y2K project is illustrated in the table
below.
                                    Illinova Status
                                       July 1999

                                IT                         Non-IT
                          %        Completion  *         %       Completion  *
                       Complete       Date            Complete      Date

Awareness                100        02/01/97   a         100      05/31/98   a

Inventory                100        01/20/97   a         100      02/28/99   a

Assessment               100        05/09/97   a         100      02/28/99   a

Process Analysis         100        11/30/98   a         100      03/31/99   a

Implementation -
  (Mission Critical)     100        06/30/99   a          97      09/30/99   e

Implementation -
  (Important to
   Operations)           100        05/31/99   a          93      10/31/99   e

Contingency Planning     100        07/31/99   a          93      09/30/99   e

*"a" = Actual Completion Date, "e" = Estimated Completion Date

        IP has  completed  its  awareness,  inventory,  assessment,  and process
analysis  phases.  The table  below  provides  further  details  differentiating
between IT and non-IT for IP alone.

                                       IP Status
                                      July 1999

                                IT                         Non-IT
                          %        Completion  *        %       Completion  *
                      Complete        Date           Complete       Date

Awareness               100        02/01/97   a        100      04/29/98   a

Inventory               100        01/20/97   a        100      07/31/98   a

Assessment              100        05/09/97   a        100      09/30/98   a

Process Analysis        100        11/30/98   a        100      02/28/99   a

Implementation -
  (Mission Critical)    100        06/30/99   a        100      07/19/99   a

                                       40


Implementation -
  (Important to
   Operations)          100        05/31/99   a         98      10/31/99   e**

Contingency Planning    100        07/31/99   a        100      06/30/99   a

*"a" = Actual Completion Date, "e" = Estimated Completion Date

** IP important to operations  items were Year 2000 ready on July 30, 1999, with
the exception of one process computer system at Clinton and one process computer
system in our fossil power system.

        IT systems  (such as billing,  payroll,  etc.) and  infrastructure  were
completed  June 30, 1999.  The customer  billing  system,  materials  management
system, accounts payable system, power plant maintenance system, payroll system,
and shareholder  system have been  remediated and are now year 2000 ready.  Year
2000 work has not caused any IT projects to be delayed,  and thus no maintenance
costs have been deferred.

        The United  States  Department  of Energy  (DOE) has  charged  the North
American   Electric   Reliability   Council  (NERC)  with  taking  the  lead  in
facilitating North  American-wide  coordination of electric utilities' Year 2000
efforts.  The collective  efforts of the industry will minimize risks imposed by
Year 2000 to the reliable supply of  electricity.  NERC has in turn assigned the
regional  reliability  councils the responsibility of assessing their respective
networks to ensure reliable  electric supply. IP is taking an active role within
its regional  council  (MAIN) in  assessment  and  renovation of the grid and in
developing contingency plans to minimize any unexpected Year 2000 grid problems.
Illinois  Power is also  participating  in NERC  drills.  IP's power  plants and
transmission  and  distribution  mission critical items are believed to be fully
Year 2000 ready.

        The  total  cost for  achieving  Year 2000  readiness  for  Illinova  is
estimated to be  approximately  $19.6 million  through 1999.  Through the end of
July 1999, $14.8 million, or 76% of the total $19.6 million had been spent.

        Contingency  plans  focus  on  Illinova's  "mission  critical"  business
processes.   Contingency  plans  were  developed  in  accordance  with  industry
guidelines,  such as NERC and the General Accounting Office, and involved senior
management review and approval.  These plans address business continuity and the
ability to deliver essential  products and services to customers in the event of
unexpected  Year  2000  problems.   Drills  will  be  conducted  to  test  these
contingency plans.

        Illinova has assessed potential  worst-case scenarios and determined its
most reasonably likely  worst-case  scenario to be a severe winter storm coupled
with  a  loss  of  major  telecommunications   carrier  causing  disruptions  in
dispatching generation,  dispatching emergency response crews, and communicating
with financial institutions.

        Contingency plans address the above scenarios as well as other potential
scenarios  that could affect the ability to serve our customers and maintain the
financial viability of Illinova.


ENVIRONMENTAL MATTERS

     GAS MANUFACTURING SITES

        See  "Manufactured Gas Plant Sites" under "Regulatory and Legal Matters"
of the "Notes to Consolidated Financial Statements" on page 16 of this report.

                                       41


     NITROGEN OXIDE

        On October 27, 1998,  the U.S. EPA finalized  air  pollution  rules that
will require  substantial  reductions  of NOx emissions in Illinois and 21 other
states.  This rule will  require the  installation  of NOx controls by May 2003,
with each Illinois  utility's  exact  reduction  requirement  to be specified in
1999.  Preliminary  estimates of the capital expenditures needed in 2000 through
2003 to comply  with these new NOx  limitations  range from $90  million to $140
million.  NOx  estimates are included in forecasted  capital  expenditures.  The
legality  of this  proposal,  along  with its  technical  feasibility,  is being
successfully  challenged by a number of states,  utility groups,  and utilities,
including IP.

     EMISSION ALLOWANCE EXCHANGES

        The  value of  emission  allowances  expected  to be given up in  future
periods as the result of exchange  agreements  was recorded in the third quarter
1998 at the current market price and a liability of $9.8 million was recognized.
This  obligation will be adjusted as price  fluctuates  until the allowances are
surrendered.  The market value and recorded  liability of the allowances at June
30, 1999, was $19.9 million.

     GLOBAL WARMING

        On December 11, 1997,  international  negotiations to reduce  greenhouse
gas emissions  concluded with the adoption of the Kyoto Protocol.  This Protocol
requires the United States to reduce  greenhouse  gas emissions to 7% below 1999
levels  during  the  years  2008  through  2012 and to make  further  reductions
thereafter.  Before it can take effect,  this  protocol  must be ratified by the
United States Senate.  However,  United States Senate Resolution 98 which passed
95-0 in July 1997,  says the Senate would not ratify an agreement  that fails to
include  commitments for all countries or would damage the economy of the United
States.  Since the Protocol does not contain  these key  elements,  ratification
would be a major  political  issue. It is anticipated  that a ratification  vote
will be delayed until the current  administration feels the Protocol could pass,
or an attractive alternative to the Kyoto Protocol is found.

        IP will face major  changes in the way it generates  electricity  if the
Kyoto  Protocol  is  ratified,   or  if  the  Protocol's   reduction  goals  are
incorporated into other environmental regulations. IP would have to repower some
generating  units and change  from coal to natural  gas in other units to reduce
greenhouse  gas  emissions.  IP estimates  that  compliance  with these proposed
regulations  may  require  significant  capital  outlays  and  annual  operating
expenses which could have a material adverse impact on Illinova and IP.


POWER SUPPLY AND RELIABILITY

        Electricity  was in short supply during the 1998 summer  cooling  season
because of an unusually high number of plant outages in the Midwest  region.  IP
bought generation and transmission capacity to prevent firm load curtailment and
took additional steps to avoid power outages,  including upgrading  transmission
lines and equipment,  readying  emergency  procedures,  and returning to service
five units that had been in cold shutdown.  This resulted in a material  adverse
financial impact on Illinova and IP.

        The electric energy market  experienced  unprecedented  prices for power
purchases  during the last week of June 1998. IP's power purchases for 1998 were
$517 million  higher than 1997 due to summer  price  spikes  resulting in a $274
million  increase in power  purchased,  additional  purchases of $215 million to
serve increased  volumes of interchange  sales, and market losses of $28 million
recorded on forward power purchase and sales  contracts as part of the wholesale

                                       42


trading business.  Income from interchange sales was $382 million higher than in
1997 due to increased sales volumes and higher prices.

        Excluding Clinton,  IP has in excess of 400 MW of additional  generation
on line for the summer of 1999 as compared to 1998. This includes  approximately
235 MW from five oil-fired units which were brought up from cold shutdown during
the summer of 1998 and 176 MW from four natural gas  turbines  that IP installed
which  became  operational  in June  1999.  Total cost for the two  projects  is
approximately  $87 million.  IP also  refurbished  nine gas turbines  already in
service at an approximate cost of $13 million. In addition, the restructuring of
the Soyland PCA  agreement  freed up an additional  287 MW of capacity.  Clinton
returned  to  full  power  operation  on  June  2,  1999,  providing  additional
generating capacity to serve firm load. IP expects to have sufficient generating
capacity  to serve firm load  during the  periods of peak  summer  demand  using
demand-side and supply-side  initiatives  taken in response to the 1998 regional
supply crisis. If generation is lost or demand is at unprecedented  levels, firm
load could be curtailed.


RESULTS OF OPERATIONS

                    THREE MONTHS ENDED JUNE 30, 1999 AND 1998

         Electric  Operations - Electric revenues for the second quarter of 1999
decreased $27.9 million  compared to the second quarter of 1998 primarily due to
the  15%  residential   rate  decrease   effective   August  1,  1998,  and  the
reclassification of revenue-related taxes mandated by deregulation  legislation.
Revenue-related  taxes are now accounted  for as a liability,  and both revenues
and general taxes are reduced with no resultant  impact on net income.  The rate
decrease  resulted in revenue  reductions of $14.9 million in the second quarter
of 1999. The impact of the  reclassification  of $9.8 million in revenue-related
taxes from revenue and general  taxes  negatively  impacted  electric  revenues.
Electric  interchange  revenues  decreased  $56.5  million.   This  decrease  is
attributable  to a decrease  in  interchange  volume  offset by $3.3  million of
income to reflect  mark-to-market  for  forward  contracts  and  options.  Power
purchased decreased $182.8 million due largely to decreased  interchange volume.
During the  quarter,  fuel for  electric  plants  increased  $6.1 million due to
increased  generation.  These factors combined to increase electric margin $92.3
million for the quarter.

         Kilowatt hour (kwh) sales to ultimate consumers  decreased 0.2% for the
quarter due to decreases of 5.3% and 0.3% in the  residential and the commercial
markets,  respectively,  offset by an increase of 2.4% in the industrial market.
Cooling degree days decreased  approximately  36% from 1998 which contributed to
the decrease in sales to the temperature-sensitive markets.

         The equivalent availability of Clinton was 38.9% and 0.0% for the three
months ended June 30, 1999 and 1998, respectively,  due to the return of Clinton
to full power on June 2, 1999.  Clinton  was  previously  unavailable  due to an
outage  which began  September 6, 1996.  The  equivalent  availability  for IP's
coal-fired  plants was 85.3% and 74.4% for the three  months ended June 30, 1999
and 1998, respectively.

         Gas  Operations - For the quarter,  gas margin  increased $0.9 million.
Gas revenues decreased $4.5 million while therm sales (excluding transport) were
constant, caused by lower gas prices. Gas purchased costs decreased $5.4 million
due to the lower gas prices and fewer therms purchased.

                                       43


        Operation and  Maintenance  Expenses - The current  quarter  decrease of
$15.8  million  is  primarily  due to  PECO's  assumption  of  Clinton's  direct
operating and capital  expenses offset by Clinton  management fees paid to PECO.
For more information,  see "PECO Agreement" of the "Management's  Discussion and
Analysis" on pages 36-37 of this report.

        Depreciation  and  amortization  -  The  increase  in  depreciation  and
amortization  for the second  quarter of 1999 compared to 1998 was $0.4 million.
Due to the Clinton  impairment,  nuclear  depreciation  decreased  approximately
$23.7 million but was offset by  approximately  $18 million for the depreciation
of the adjustment to fair value for the fossil  generation  assets. In addition,
approximately  $5  million  in  expense  related  to  the  amortization  of  the
transition  period  cost  recovery  asset  created  as part of the 1998  Clinton
impairment was recognized in the second quarter.

        Diversified  enterprises -  Diversified  enterprise  revenues  increased
$21.0 million for the second quarter of 1999, which was offset by an increase in
diversified enterprise expenses of $29.5 million. A majority of the net increase
in diversified  enterprise expense over diversified enterprise revenue is due to
merger related transactions.

        Miscellaneous - net - Of the current  quarter  increase of $3.4 million,
$1.6 million of the increase is attributed to the  adjustment in the net present
value  of  the  decommissioning  regulatory  asset.  Revenues  from  non-utility
operations also increased in the second quarter of 1999.

        Interest  expense - The increase in interest expense of $10.9 million in
the second  quarter of 1999 is  primarily  the result of interest  on  increased
long-term  debt of $3.9 million and the  adjustment  in the net present value of
the decommissioning liability of $7.3 million.

        Earnings  (loss) per Common Share - The earnings (loss) per common share
for  Illinova  during the  second  quarter  of 1999 and 1998  resulted  from the
interaction  of all the  factors  discussed  herein  as well as fewer  shares of
common stock outstanding.

                                       44


RESULTS OF OPERATIONS

                SIX MONTHS ENDED JUNE 30, 1999 AND 1998

        Electric Operations - Electric revenues for the first six months of 1999
decreased  $49.3  million as compared to the first six months of 1998  primarily
due to the 15%  residential  rate  decrease  effective  August 1, 1998,  and the
reclassification of revenue-related taxes mandated by deregulation  legislation.
Revenue-related  taxes are now accounted  for as a liability,  and both revenues
and general taxes are reduced.  The rate decrease resulted in revenue reductions
of  $32.3  million  in  the  first  six  months  of  1999.  The  impact  of  the
reclassification  of $21.1  million in  revenue-related  taxes from  revenue and
general  taxes  negatively  impacted  revenues.  Electric  interchange  revenues
decreased  $58.8  million.  This  decrease  is  attributable  to a  decrease  in
interchange  volume offset by $60.1 million revenue  recognition  resulting from
the restructuring of a Soyland Power  Cooperative  power supply contract.  Power
purchased decreased $228.2 million due largely to decreased  interchange volume.
During the first six months, fuel for electric plants increased $1.8 million due
to increased  generation.  These factors  combined to increase  electric  margin
$118.3 million.

        Kilowatt hour (kwh) sales to ultimate  consumers  increased 3.0% for the
first six months  primarily due to increases of 3.3% and 4.4% in the residential
and  the  commercial  markets,  respectively.   Cooling  degree  days  decreased
approximately   36%  from   1998   which   contributed   to  the   decrease   in
temperature-sensitive markets, which was offset by an increase of 11% in heating
degree days.

        The  equivalent  availability  of Clinton was 19.5% and 0.0% for the six
months ended June 30, 1999 and 1998, respectively,  due to the return of Clinton
to full power on June 2, 1999.  Clinton  was  previously  unavailable  due to an
outage  which began  September 6, 1996.  The  equivalent  availability  for IP's
coal-fired plants was 83.1% and 76.9% for the six months ended June 30, 1999 and
1998, respectively.

        Gas  Operations  - For the six months  ended June 30,  1999,  gas margin
increased $0.8 million.  Gas revenues increased $2.0 million,  while therm sales
(excluding transport) were constant,  caused by colder winter weather, offset by
lower gas prices.  Gas  purchased  costs  increased  $1.1  million due to higher
consumption, offset by lower gas prices and fewer therms purchased.

        Operation and  Maintenance  Expenses - Of the increase for the first six
months of 1999 of $27.1 million,  $29 million  occurred during the first quarter
of 1999 due to higher  operating and  maintenance  expenses  associated with the
Clinton  outage.  This $29 million  includes  $12.4 million of costs which would
have been considered capital additions had Clinton not been impaired. During the
second quarter PECO assumed  Clinton's  direct  operating and capital  expenses,
which were offset by Clinton management fees paid to PECO. For more information,
see "PECO Agreement" of the  "Management's  Discussion and Analysis" on pages 36
and 37 of this report.

        Depreciation  and  Amortization  -  The  decrease  in  depreciation  and
amortization  for the first  six  months  of 1999 as  compared  to 1998 was $4.2
million.  Due  to  the  Clinton  impairment,   nuclear  depreciation   decreased
approximately  $47 million,  but was offset by approximately $36 million for the
depreciation of the adjustment to fair value for the fossil  generation  assets.
In addition,  approximately $5 million in expense related to the amortization of
the  transition  period  cost  recovery  asset  created  as part of the  Clinton
impairment was recognized in the second quarter.

        Diversified  enterprises -  Diversified  enterprise  revenues  increased
$11.2 million for the first six months of 1999,  which was offset by an increase
in  diversified  enterprise  expense  of  $16.3  million.  The net  increase  of

                                       45


diversified  enterprise  expense  over  diversified  enterprise  revenues is due
primarily to merger related transaction costs.

        Miscellaneous - net - Of the first six months increase of $15.8 million,
$6.5 million is  miscellaneous  credits of IGC.  Interest income  increased $3.0
million  primarily  due to the  investment  of the proceeds of the  transitional
funding  trust  notes  issued in  December  1998 and the  adjustment  in the net
present value of the  decommissioning  regulatory asset. A $2.1 million increase
in  miscellaneous  non-operating  income is  attributable  to the recognition of
nontaxable income related to the decommissioning regulatory asset. Revenues from
non-utility operations also increased during the first six months of 1999.

        Interest  expense - The increase in interest expense of $17.4 million in
the first six months of 1999 is the result of  interest on  increased  long-term
debt  of  $5.6  million,  the  adjustment  in  the  net  present  value  of  the
decommissioning  liability of $14 million,  and increased  amortization  of debt
expense  and  loss on  reacquired  debt of $2.6  million,  offset  by  decreased
interest on short term debt of $4.8 million.

        Earnings  per Common  Stock - The earnings per common share for Illinova
during the first six months of 1999 and 1998  resulted from the  interaction  of
all the  factors  discussed  herein  as well as fewer  shares  of  common  stock
outstanding.


RESULTS OF OPERATIONS - ILLINOVA SEGMENTS OF BUSINESS

                     THREE MONTHS ENDED JUNE 30, 1999

Customer Service
For the three months ended June 30, 1999, both the contribution  margin and cash
flow measures were lower than for the corresponding period in 1998. Contribution
margin is lower for the  quarter  by $21  million,  primarily  due to  decreased
electric revenues as discussed below. Other factors contributing to the decrease
are  amortization of the regulatory  asset,  slightly  higher O&M expenses;  and
higher internal charges paid to the Wholesale Energy Group and Nuclear Group for
the purchase of  electricity.  Partially  offsetting  these items were  slightly
lower gas purchases than in 1998.

Cash flow also  reflected a decrease of about $36 million  from 1998,  primarily
due to lower net income.

Transmission, Distribution and Sale of Electric Energy
- ------------------------------------------------------
The Customer  Service  Business  Group  derives its revenues  through  regulated
tariffs.  Its source of electricity is the Wholesale  Energy  business group and
the Nuclear group;  electricity  was provided to the Customer  Service  Business
Group at a fixed 2.9 cents per kwh in 1999 and 2.5 cents per kwh in 1998.

Retail electric  revenues,  excluding  interchange  sales,  for the three months
ended  June 30,  1999  decreased  10.0% over the  corresponding  period in 1998,
primarily due to the 15% residential  decrease  mandated by P.A.  90-561,  which
became  effective July 15, 1998,  voluntarily  advanced by IP from the statutory
effective  date of August 1 and a slight  decrease  in kwh  sales to  customers.
Additionally, operating costs were higher during the three months ended June 30,
1999 compared to the same period in 1998.

                                       46


Transmission, Distribution and Sale of Natural Gas
- --------------------------------------------------
Revenues are derived through  regulated  tariffs.  During the three months ended
June 30, 1999,  revenues from gas sales and transportation were down 9.1%, while
therms sold and  transported  were up slightly (0.9%) over the second quarter of
1998.  The  decrease  in  revenues  was due to lower gas  prices in 1999,  which
resulted  in lower PGA  revenues.  The  margin  on gas sales and  transportation
increased  3.3% during the period due to a  prior-period  PGA adjustment and the
slight increase in therm sales.


Wholesale Energy
Contribution  margin  during the three  months  ended June 30, 1999 is about $41
million higher than during the  corresponding  period in 1998,  primarily due to
the  significantly  higher  purchased  power  costs  in 1998,  when the  Company
purchased  high-priced  electricity to meet system  requirements  and off-system
sale  obligations.  Partially  offsetting this major variance in power purchases
are lower revenues,  higher  depreciation due to the write-up to market value of
the fossil assets,  higher O&M costs and higher  internal  charges  recorded for
power purchased from the nuclear facility.

Cash flow decreased about $129 million,  primarily due to higher purchased power
costs in 1998, allocated to the Nuclear Group. Higher construction  expenditures
in 1999 to reflect the  installation of gas turbines at the Tilton Energy Center
were also a significant factor in this decrease.

Wholesale  Energy provided power to the Customer  Service  business group at 2.9
cents per kwh during the three months ended June 30, 1999  compared to 2.5 cents
per kwh during the corresponding period in 1998.


Nuclear
Both the contribution  margin and cash flow measures are higher in 1999 compared
to 1998.  Contribution  margin  is higher  than 1998 due to higher  intersegment
revenues in 1999 related to the restart of the plant in 1999, coupled with lower
O&M and depreciation expenses in 1999.

Cash flow was positively impacted by net income.


Illinova Energy Partners, Inc.
For the three months ended June 30, 1999, the contribution  margin is comparable
to the same period in 1998. Cash flow decreased $4.3 million, primarily due to a
negative change in working capital.


Illinova Generating Compan
For the three months ended June 30, 1999, the contribution  margin variance from
1998 was less than $1 million. Cash flow increased about $10 million,  primarily
due to a positive change in working capital.


Other
Included in this category are the Financial Business Group, the Support Services
Business  Group,  and Corporate.  These segments did not  individually  meet the
minimum threshold requirements for separate disclosure.

See "Illinova Segments of Business" in the footnotes to the financial statements
on pages 19-25 for additional information.

                                       47


RESULTS OF OPERATIONS - ILLINOIS POWER SEGMENTS OF BUSINESS

                   THREE MONTHS ENDED JUNE 30, 1999

Customer Service
For the three months ended June 30, 1999, both the contribution  margin and cash
flow measures were lower than for the corresponding period in 1998. Contribution
margin is lower for the  quarter  by $21  million,  primarily  due to  decreased
electric revenues as discussed below. Other factors contributing to the decrease
are  amortization of the regulatory  asset,  slightly  higher O&M expenses;  and
higher internal charges paid to the Wholesale Energy Group and the Nuclear Group
for the purchase of electricity.  Partially offsetting these items were slightly
lower gas purchases than in 1998.

Cash flow also  reflected a decrease of about $36 million  from 1998,  primarily
due to lower net income.


Transmission, Distribution and Sale of Electric Energy
- ------------------------------------------------------
The Customer  Service  Business  Group  derives its revenues  through  regulated
tariffs.  Its source of electricity is the Wholesale  Energy  business group and
the Nuclear group;  electricity  was provided to the Customer  Service  Business
Group at a fixed 2.9 cents per kwh in 1999 and 2.5 cents per kwh in 1998.

Retail electric  revenues,  excluding  interchange  sales,  for the three months
ended  June 30,  1999  decreased  10.0% over the  corresponding  period in 1998,
primarily due to the 15% residential  decrease  mandated by P.A.  90-561,  which
became  effective July 15, 1998,  voluntarily  advanced by IP from the statutory
effective  date of August 1 and a slight  decrease  in kwh  sales to  customers.
Additionally, operating costs were higher during the three months ended June 30,
1999 compared to the same period in 1998.


Transmission, Distribution and Sale of Natural Gas
- --------------------------------------------------
Revenues are derived through  regulated  tariffs.  During the three months ended
June 30, 1999,  revenues from gas sales and transportation were down 9.1%, while
therms sold and  transported  were up slightly (0.9%) over the second quarter of
1998.  The  decrease  in  revenues  was due to lower gas  prices in 1999,  which
resulted  in lower PGA  revenues.  The  margin  on gas sales and  transportation
increased  3.3% during the period due to a  prior-period  PGA adjustment and the
slight increase in therm sales.


Wholesale Energy
Contribution  margin  during the three  months  ended June 30, 1999 is about $41
million higher than during the  corresponding  period in 1998,  primarily due to
the  significantly  higher  purchased  power  costs  in 1998,  when the  Company
purchased  extremely  high-priced   electricity  to  meet  system  requirements.
Partially  offsetting this major variance in power purchases are lower revenues,
higher  depreciation  due to the write-up to market value of the fossil  assets,
higher O&M costs and higher internal  charges  recorded for power purchased from
the nuclear facility.

Cash flow decreased about $129 million,  primarily due to higher purchased power
costs in 1998 allocated to the Nuclear Group. Higher  construction  expenditures
in 1999 to reflect the  installation of gas turbines at the Tilton Energy Center
were also a significant factor in this decrease.

Wholesale  Energy provided power to the Customer  Service  business group at 2.9
cents per kwh during the three months ended June 30, 1999  compared to 2.5 cents
per kwh during the corresponding period in 1998.

                                       48


Nuclear
Both the contribution  margin and cash flow measures are higher in 1999 compared
to 1998.  Contribution  margin  is higher  than 1998 due to higher  intersegment
revenues in 1999 related to the restart of the plant in 1999, coupled with lower
O&M and depreciation expenses in 1999.

Cash flow was positively affected by net income.


Other
Included in this category are the Financial Business Group, the Support Services
Business  Group,  and  other  corporate   functions.   These  segments  did  not
individually meet the minimum threshold requirements for separate disclosure.


See  "Illinois  Power  Segments of Business" in the  footnotes to the  financial
statements on pages 25-31 for additional information.


RESULTS OF OPERATIONS - ILLINOVA SEGMENTS OF BUSINESS

                     SIX MONTHS ENDED JUNE 30, 1999

Customer Service
For the six months ended June 30, 1999,  both the  contribution  margin and cash
flow measures were lower than for the corresponding period in 1998. Contribution
margin is lower by $46 million,  primarily due to decreased electric revenues as
discussed  below;  higher O&M  expenses;  higher  internal  charges  paid to the
Wholesale  Energy  Group and the  Nuclear  Group due to higher  usage and higher
internal pricing and higher depreciation  expenses,  including  regulatory asset
amortization.

Cash flow is lower by $67 million, due to decreased net income, partially offset
by lower construction expenditures.

Transmission, Distribution and Sale of Electric Energy
- ------------------------------------------------------
The Customer  Service  business  group  derives its revenues  through  regulated
tariffs.  Its source of electricity is the Wholesale  Energy  business group and
the Nuclear group;  electricity  was provided to the Customer  Service  Business
Group at a fixed 2.9 cents per kwh in 1999 and 2.5 cents per kwh in 1998.

Retail electric revenues,  excluding interchange sales, for the six months ended
June 30, 1999  decreased 8.5% over the  corresponding  period in 1998 due to the
15% residential  decrease  mandated by P.A. 90-561,  which became effective July
15, 1998, voluntarily advanced by IP from the statutory effective date of August
1, partially offset by increased kwh sales to customers. Additionally, operating
costs were higher during the six months ended June 30, 1999 compared to the same
period in 1998.

Transmission, Distribution and Sale of Natural Gas
- --------------------------------------------------
Revenues are derived through regulated tariffs. During the six months ended June
30, 1999,  revenues from gas sales and transportation were up 1.1%, while therms
sold and  transported  were up 5.6%. The increase in therm sales was caused by a
return to normal  weather after the  milder-than-usual  weather  experienced  in
1998.  The  margin on gas sales and  transportation  increased  1.0%  during the
period due to increases in both therms sold and therms transported.


Wholesale Energy
Contribution  margin  during the six months  ended June 30,  1999 is $59 million
higher than during the corresponding  period in 1998, due to significantly fewer

                                       49


power  purchases  in 1999  than in 1998  when the  Company  purchased  extremely
high-priced  electricity to meet system requirements.  Partially offsetting this
major  variance  in power  purchases  are  higher  internal  charges in 1999 for
purchase of  Clinton-generated  electricity,  higher depreciation to reflect the
write-up  of fossil  assets in  December  1998,  higher O&M  expenses  and lower
interchange sales in 1999.

Cash flow is significantly less than 1998 ($260 million) primarily due to higher
power  purchase  costs  in  1998,   allocated  to  the  Nuclear  Group,   higher
construction  expenditures and the receipt of prepaid base capacity charges from
Soyland in 1998.

Wholesale  Energy provided power to the Customer  Service  business group at 2.9
cents per kwh during the six months  ended June 30,  1999  compared to 2.5 cents
per kwh during the corresponding period in 1998.


Nuclear
Contribution margin is higher than 1998 due to increased  intersegment  revenues
in 1999 related to the restart of the plant in 1999, lower  depreciation in 1999
as a result  of the  write-off  of  nuclear  facilities,  and lower  cost  power
purchases to replace Clinton generation.

Cash flow was positively impacted by net income.


Illinova Energy Partners, Inc.
For the six months ended June 30, 1999, the contribution margin is comparable to
the same period in 1998. Cash flow increased about $8 million, primarily related
to changes in working capital.


Illinova Generating Company
For the six months ended June 30, 1999, the  contribution  margin  variance from
1998 was less than $1 million. Cash flow increased about $18 million,  primarily
due to changes in working capital.


Other
Included in this category are the Financial Business Group, the Support Services
Business  Group,  and Corporate.  These segments did not  individually  meet the
minimum threshold requirements for separate disclosure.

See "Illinova Segments of Business" in the footnotes to the financial statements
on pages 19-25 for additional information.

                                       50


RESULTS OF OPERATIONS - ILLINOIS POWER SEGMENTS OF BUSINESS

                     SIX MONTHS ENDED JUNE 30, 1999

Customer Service
For the six months ended June 30, 1999,  both the  contribution  margin and cash
flow measures were lower than for the corresponding period in 1998. Contribution
margin is lower by $46 million,  primarily due to decreased electric revenues as
discussed  below;  higher O&M  expenses;  higher  internal  charges  paid to the
Wholesale  Energy  Group and the  Nuclear  Group due to higher  usage and higher
internal pricing and higher depreciation  expenses,  including  regulatory asset
amortization.

Cash flow is lower by $67  million,  due to  decreased  net income  and  reduced
changes in working capital, partially offset by lower construction expenditures.

Transmission, Distribution and Sale of Electric Energy
- ------------------------------------------------------
The Customer  Service  business  group  derives its revenues  through  regulated
tariffs.  Its source of electricity is the Wholesale  Energy  business group and
the Nuclear group;  electricity  was provided to the Customer  Service  Business
Group at a fixed 2.9 cents per kwh in 1999 and 2.5 cents per kwh in 1998.

Retail electric revenues,  excluding interchange sales, for the six months ended
June 30, 1999  decreased 8.5% over the  corresponding  period in 1998 due to the
15% residential  decrease  mandated by P.A. 90-561,  which became effective July
15, 1998, voluntarily advanced by IP from the statutory effective date of August
1, partially offset by increased kwh sales to customers. Additionally, operating
costs were higher during the six months ended June 30, 1999 compared to the same
period in 1998.

Transmission, Distribution and Sale of Natural Gas
- --------------------------------------------------
Revenues are derived through regulated tariffs. During the six months ended June
30, 1999,  revenues from gas sales and transportation were up 1.1%, while therms
sold and  transported  were up 5.6%. The increase in therm sales was caused by a
return to normal  weather after the  milder-than-usual  weather  experienced  in
1998.  The  margin on gas sales and  transportation  increased  1.0%  during the
period  due to a prior year  adjustment  to gas costs and by  increases  in both
therms sold and therms transported.

Wholesale Energy
Contribution  margin  during the six months  ended June 30,  1999 is $59 million
higher than during the corresponding  period in 1998, due to significantly fewer
power  purchases  in 1999 than in 1998 when the  Company  purchased  high-priced
electricity  to  meet  system  requirements  and  off-system  sale  obligations.
Partially  offsetting this major variance in power purchases are higher internal
charges  in  1999  for  purchase  of   Clinton-generated   electricity,   higher
depreciation  to reflect the write-up of fossil assets in December 1998,  higher
O&M expenses and lower interchange sales in 1999.

Cash flow is significantly less than 1998 ($260 million) primarily due to higher
purchase power costs in 1998 allocated to the Nuclear Group, higher construction
expenditures  and the receipt of prepaid base  capacity  charges from Soyland in
1998.

Wholesale  Energy provided power to the Customer  Service  business group at 2.9
cents per kwh during the six months  ended June 30,  1999  compared to 2.5 cents
per kwh during the corresponding period in 1998.


Nuclear
Contribution margin is higher than 1998 due to increased  intersegment  revenues
in 1999 related to restart of the plant in 1999, lower depreciation in 1999 as a

                                       51


result of the write-off of nuclear facilities, and lower cost power purchases to
replace Clinton generation.

Cash flow was positively impacted by net income.


Other
Included in this category are the Financial Business Group, the Support Services
Business  Group,  and Corporate.  These segments did not  individually  meet the
minimum threshold requirements for separate disclosure.

See  "Illinois  Power  Segments of Business" in the  footnotes to the  financial
statements on pages 25-31 for additional information.

                                       52


ITEM 3. Quantitative and Qualitative Disclosures About Market Risk


RISK MANAGEMENT

        Illinova is exposed to both trading and  non-trading  market risks.  The
non-trading  market risks to which  Illinova is exposed  include  interest  rate
risk, equity price risk,  foreign currency risks, and commodity price risks. The
market  risk  due  to  trading  consists  primarily  of  commodity  price  risk.
Illinova's  risk  management  policy  allows  the  use of  financial  derivative
products,  like  futures,  swaps,  and  certain  types of  options to manage its
positions.  Illinova uses various approaches to measure and monitor market risk,
which include  Value-at-Risk (VaR) and position  sensitivity  measures to market
factors.  VaR is the maximum  potential loss that may be incurred on a portfolio
due to  adverse  movements  in  market  factors,  given a  confidence  level and
specified  holding  period.  VaR does not represent the expected nor the maximum
loss that may  actually  occur  since  gains and losses  may  differ  from those
estimated,  based on actual  fluctuations  in market  factors and changes in the
composition of the portfolio during a given evaluation period.

INTEREST RATE RISK

        Illinova is exposed to interest rate risk from its financing activities,
through issuance of fixed or  variable-rate  debt and acquisition of bank notes.
IP is likewise  exposed to interest  rate risk  resulting  from its  issuance of
fixed or variable-rate  debt,  commercial  paper, and bank notes.  Interest rate
exposure is managed in  accordance  with policy by  limiting  the  variable-rate
exposure to a certain  percentage of  capitalization.  Interest rate  derivative
instruments  are also used when deemed  appropriate to change the composition of
variable to fixed-rate component.  In addition, the sensitivity of the portfolio
to changes in market  factors like interest rate levels and  volatility are also
monitored. At June 30, 1999, there was no interest rate derivative instrument in
use.

        Interest rate VaR is calculated based on a variance-covariance  approach
using the RiskMetrics FourFifteen(TM) model. A 95 percent confidence level and a
one-day  holding period is currently used. The interest rate risk as measured by
VaR at June 30, 1999, March 31, 1999, and December 31, 1998, is given below.

- --------------------------------------------------------------------------------
(Millions of dollars)      June 30, 1999   March 31,1999     December 31,1998
- --------------------------------------------------------------------------------
                                VaR            VaR                  VaR

Illinova, including IP debt     $7.9           $9.2                $14.9

IP debt only                    $7.3           $8.7                $14.2
- --------------------------------------------------------------------------------

        Contributing  factors to the decrease in VaR were the retirement of high
coupon  debt with  maturities  extending  past the year 2020 and an  increase in
commercial  paper levels from that at year end. At December  31,  1998,  VaR was
unusually  high due to the  issuance  of  securitized  debt with the  removal of
called  bonds not  occurring  until  after year end.  The  securitized  debt has
shorter  maturities  than the called  bonds,  which further  contributed  to the
decrease in VaR.

                                       53


COMMODITY PRICE RISK

Trading Positions

        Illinova is exposed to commodity  price risk through IEP's power trading
activities   and  IP's   trading  and   non-trading   operations.   IEP  uses  a
variance-covariance  approach to calculate VaR,  similar to the  RiskMetrics(TM)
model, to monitor and control its market risk positions. IP measures,  monitors,
and manages its commodity  price risk using a proprietary  VaR model employing a
Monte Carlo simulation  technique.  IP and IEP both use a 95 percent  confidence
level and a five-day  holding  period to monitor their daily trading market risk
positions.  During the first quarter of 1999, the Board approved a change in the
risk management  policy,  to use a five day holding period instead of a four-day
period.  IP's and  IEP's  trading  VaR at June 30,  1999,  March 31,  1999,  and
December 31, 1998, as restated using a five day holding period follow:

- --------------------------------------------------------------------------------
                       June 30, 1999     March 31, 1999     December 31, 1998
- --------------------------------------------------------------------------------
(Millions of Dollars)       VaR            VaR                      VaR

IP                          $0.3           $0.6                    $1.4
IEP                          0.1            0.1                     0.1
- --------------------------------------------------------------------------------

        IP and IEP both use stress and scenario testing to control "event risk",
(i.e., the risk that certain  stressful market events will occur and result in a
loss). In addition, option positions are monitored using sensitivity limits such
as delta  (sensitivity  to price change),  gamma  (sensitivity of delta to price
change), and vega (sensitivity to change in implied volatility).

Non-Trading Positions

        IP is also  exposed to  non-trading  commodity  price risk  through  its
energy generation business.  IP uses physical contracts and is authorized to use
financial  derivative  instruments  to manage its native load  requirements.  To
measure,  monitor,  and  control  the  commodity  price risk of its  non-trading
portfolio,  IP uses the same  proprietary  Monte Carlo model used in the trading
portfolio.

        The Monte-Carlo  simulation process used in this VaR model generates the
power  price,  fuel price and load series that are used to value the  generation
assets,  fuel assets,  and  contracts  entered into by the firm (e.g.,  tolling,
forward,  call and put  options).  A  sophisticated  process is used to generate
daily and hourly prices based on historical price series and volatility, wherein
"price spikes," a recent phenomenon in the electricity markets, are modeled into
the price  series.  The VaR  calculated  by this model  represents  the  maximum
reduction in operating margin given a 95 percent  confidence  level.  This means
that  there is only a 5 percent  probability  that the  reduction  in  operating
margin from the expected margin will be greater than what is provided by the VaR
number. In this model, a sufficient  number of scenarios are generated,  whereby
each  scenario  simulates  a one-year  margin  (one-year  holding  period).  The
expected  margin is obtained by averaging  the margins  calculated  from all the
simulation scenarios. The VaR is obtained by sorting the simulation results from
the lowest to highest value and taking the 95th percentile worst case value.

        Since the new VaR  methodology was implemented at the beginning of March
1999,  there is no comparable  VaR number at December 31, 1998.  The VaR for the
non-trading  portfolio  at June 30,  1999 and March 31,  1999,  using a five-day
holding period is $4.9 million and $11.6 million, respectively.

        The overall IP electricity  portfolio is also controlled using quarterly
expected margin reduction  limits. In this process,  the difference  between the
current expected margin and last quarter's  expected margin is monitored against

                                       54


the quarterly  limits.  To control  "event risk," IP measures the  "Stress-VaR,"
i.e., the VaR calculated using assumptions similar to the events that led to the
electricity  price spikes in June 1998. The  "Stress-VaR"  is monitored  against
stress limits that were approved by the Board of Directors.

FOREIGN OPERATIONS RISK

        Illinova's  foreign  operations risk is its inherent risk of loss due to
the potential  volatility  of emerging  countries  and  fluctuations  in foreign
currency  exchange rates in relation to the U.S.  dollar.  At June 30, 1999, IGC
had invested $78 million in several international operations,  many of which are
joint  ventures.   Primarily,  these  investments  are  with  affiliates  owning
energy-related production, generation, and transmission facilities.

        IGC is exposed to  foreign  currency  risk,  sovereign  risk,  and other
foreign  operations risks,  primarily  through  investments in affiliates of $48
million in Asia and $127 million in South and Central America. To mitigate risks
associated with foreign currency fluctuations, the majority of contracts entered
into by IGC or its affiliates are denominated in or indexed to the U.S. dollar.


OTHER MARKET RISK

        Illinova  is  exposed  to equity  price risk  primarily  through  IP. IP
maintains  trust funds, as required by the NRC, to fund certain costs of nuclear
decommissioning.  As of June 30, 1999, these funds were invested in domestic and
international  equity  securities,  fixed income  securities,  and cash and cash
equivalents.  By maintaining a portfolio that includes equity investments, IP is
maximizing the return to be used to fund nuclear  decommissioning,  which in the
long term will correlate better with inflationary  increases in  decommissioning
costs. The equity securities included in the Corporation's portfolio are exposed
to price  fluctuations in equity markets as a result of fluctuations in interest
rates. IP actively monitors its portfolio by benchmarking the performance of its
investments   against  equity  and  fixed-income   indexes.   It  maintains  and
periodically reviews established target allocations of the trust assets approved
in the investment  policy  statement.  VaR at June 30, 1999, and March 31, 1999,
calculated  based on a 95 percent  confidence level and a one day holding period
follows:

- --------------------------------------------------------------------------------
                                       June 30, 1999           March 31, 1999
- --------------------------------------------------------------------------------
(Millions of dollars)                     VaR                      VaR

IP                                        $1.4                     $1.4
- --------------------------------------------------------------------------------

                                       55


ITEM 6. Exhibits and Reports on Form 8-K

   (a)   Exhibits

         The Exhibits filed with this 10-Q are listed on the Exhibit Index.

   (b)   Reports on Form 8-K since March 31, 1999:

            Report filed on Form 8-K on April 19, 1999
                                 Item 5, Other Events: Press Release: Illinova
                                 Releases 1999 first quarter earnings,
                                 Announces expected sale of Clinton to
                                 AmerGen.
                                 Item 7, Exhibits: Illinova Consolidated
                                 Income Statements.

            Report filed on Form 8-K on June 14, 1999
                                 Item  5: Illinova announces merger
                                 agreement  with Dynegy, Inc.

            Report filed on Form 8-K on June 17, 1999
                                 Item 5, Other Events: Merger agreement
                                 update, Clinton Power Station update,
                                 fossil generating subsidiary update.
                                 Item 7, Exhibits: Illinova statement
                                 regarding computation of ratios.

            Report filed on Form 8-K on July 12, 1999
                                 Item 5, Other Events: Press release: IP/
                                 AmerGen sign Definitive Agreement for
                                 Sale of Clinton. ICC approval of fossil
                                 generating subsidiary.

            Report filed on Form 8-K on July 16, 1999
                                 Item 5, Other Events: Press release:
                                 Illinova Releases 1999 second quarter
                                 Earnings.
                                 Item 7, Exhibits: Illinova Consolidated
                                 Income Statements.

                                       56


SIGNATURES

Pursuant  to the  requirements  of the  Securities  Exchange  Act of  1934,  the
registrant  has duly  caused  this  report  to be  signed  on its  behalf by the
undersigned thereunto duly authorized.

                                                 ILLINOVA CORPORATION
                                                 (Registrant)



                                                 /s/Larry F. Altenbaumer
                                                 ---------------------------
                                                 Larry F. Altenbaumer
                                                 Senior Vice President,
                                                 Chief Financial Officer,
                                                 Treasurer and Controller
                                                 on behalf of
                                                 Illinova Corporation







Date: August 16, 1999

                                       57


SIGNATURES

Pursuant  to the  requirements  of the  Securities  Exchange  Act of  1934,  the
registrant  has duly  caused  this  report  to be  signed  on its  behalf by the
undersigned thereunto duly authorized.

                                                 ILLINOIS POWER COMPANY
                                                 (Registrant)



                                                 /s/Larry F. Altenbaumer
                                                 ---------------------------
                                                 Larry F. Altenbaumer
                                                 Senior Vice President and
                                                 Chief Financial Officer
                                                 on behalf of
                                                 Illinois Power Company







Date: August 16, 1999

                                       58


EXHIBIT INDEX

                                                           PAGE NO. WITHIN
                                                        SEQUENTIAL NUMBERING
EXHIBIT      DESCRIPTION                                       SYSTEM

4         Instruments Defining Rights of Security
          Holders, Including Indentures - Illinois
          Power Company

4.1       Supplemental  Indenture dated as of June
          15, 1999 to Mortgage and Deed of Trust
          dated  November 1, 1943  providing for the
          issuance  of $250,000,000 principal amount
          of 7.5% mortgage bonds.                                 60 - 74

4.2       Supplemental  Indenture dated as of June
          15, 1999 to General Mortgage Indenture
          and Deed of Trust dated as of November 1,
          1992 providing for the issuance of 7.50%
          New Mortgage Bonds.                                     75 - 84

4.3       Supplemental  Indenture dated as of July
          15, 1999 to Mortgage and Deed of  Trust
          dated November 1, 1943  providing for the
          issuance of $35,615,000 principal amount
          of 5.70% Series U Pollution Control Bonds.              85 - 98

4.4       Supplemental  Indenture dated as of July
          15, 1999 to General Mortgage Indenture and
          Deed of Trust dated as of November 1, 1992
          providing for the issuance of $35,615,000
          principal amount of 5.70% Series U
          Pollution Control Bonds.                                99 - 110

4.5       Supplemental  Indenture dated as of July
          15, 1999 to Mortgage and Deed of Trust
          dated November 1, 1943 providing for the
          issuance of $84,150,000 principal amount
          of 7.40% Series V Pollution Control Bonds.             111 - 124

4.6       Supplemental Indenture dated as of July
          15, 1999 to General Mortgage Indenture and
          Deed of Trust dated as of November 1, 1992
          providing for the issuance of $84,150,000
          principal amount of 7.40% series V
          Pollution Control Bonds.                               125 - 136

10.1      Clinton Nuclear Power Station Asset
          Purchase Agreement by and between Illinois
          Power Company, as Seller, and AmerGen
          Energy Company, L.L.C, as Buyer, dated as
          of June 30, 1999.                                      137 - 241

12.1      Computation of ratio of earnings to fixed
          charges for Illinova Corporation.                            242

12.2      Computation of ratio of earnings to fixed
          charges for Illinois Power Company.                          243

27        Financial Data Schedule UT
          (filed herewith)

                                       59