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


                                 Form 10-Q/A

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

               For the quarterly period ended March 31, 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 April 30, 1999

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




                                 ILLINOVA CORPORATION
                                ILLINOIS POWER COMPANY

This  combined  Form  10-Q/A 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/A FOR THE QUARTER ENDED March 31, 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 - 26

   Item 2:  Management's Discussion and Analysis of
                 Financial Condition and Results of
                 Operations for Illinova Corporation
                 and Illinois Power Company                        27 - 44

   Item 3:  Quantitative and Qualitative Disclosures
                 About Market Risk                                 45 - 47

Part II.  OTHER INFORMATION

   Item 6:  Exhibits and Reports on Form 8-K and 8-K/A                  48

   Signatures                                                      49 - 50

   Exhibit Index                                                        51


                                       2


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

                                                       MARCH 31,    DECEMBER 31,
                                                         1999          1998
ASSETS                                               (Unaudited)     (Audited)
                                                        (Millions of Dollars)
Utility Plant
    Electric (includes construction work
               in progress of $139.4 million and
               $177.7 million, respectively)           $5,496.0         $5,481.8
    Gas (includes construction work
               in progress of $14.8 million and
               $15.3 million, respectively)               690.5            686.9
                                                       ---------        --------
                                                        6,186.5          6,168.7
Less - Accumulated depreciation                         1,736.6          1,713.7
                                                       ---------        --------
                                                        4,449.9          4,455.0
Nuclear fuel under capital lease                           20.3             20.3
                                                       ---------        --------
       Total utility plant                              4,470.2          4,475.3
                                                       ---------        --------
Investments and Other Assets                              256.8            246.9
                                                       ---------        --------
Current Assets
    Cash and cash equivalents                              65.7            518.1
    Accounts receivable (less allowance
     for doubtful accounts of $5.5 million)
       Service                                            116.6            105.9
       Other                                               91.4            116.1
    Accrued unbilled revenue                               64.4             82.6
    Materials and supplies, at average cost                80.2             90.8
    Assets from commodity price risk
       management activities                               58.5             51.5
    Prepayments and other                                  61.7             51.5
                                                       ---------        --------
       Total current assets                               538.5          1,016.5
                                                       ---------        --------
Deferred Charges
    Transition period cost recovery                       457.3            457.3
    Other                                                 347.0            279.6
                                                       ---------        --------
       Total deferred charges                             804.3            736.9
                                                       ---------        --------
                                                       $6,069.8         $6,475.6
                                                       =========        ========

                                       3


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

                                                       MARCH 31,    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             $1,123.3         $1,123.2
    Less - Deferred compensation - ESOP                     5.3              6.8
    Retained deficit - accumulated since 1/1/99            (3.4)               -
    Accumulated other comprehensive income                  0.2                -
    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                   968.8            970.4

    Preferred stock of subsidiary                          52.9             57.1
    Company obligated mandatorily redeemable
       preferred stock of subsidiary                      194.5            199.0
    Long-term debt                                        175.7            176.1
    Long-term debt of subsidiary                        2,078.7          2,158.5
                                                       --------         --------
              Total capitalization                      3,470.6          3,561.1
                                                       --------         --------

Current Liabilities
    Accounts payable                                      216.4            256.5
    Notes payable                                         263.5            147.6
    Long-term debt and lease obligations
       of subsidiary maturing within one year             182.0            506.6
    Liabilities from commodity price
       risk management activities                         105.2             99.8
    Other                                                 170.6            203.8
                                                       --------         --------
              Total current liabilities                   937.7          1,214.3
                                                       --------         --------
Deferred Credits
    Accumulated deferred income taxes                     846.0            834.8
    Accumulated deferred investment tax credits            39.2             39.6
    Decommissioning liability                             574.2            567.4
    Other                                                 202.1            258.4
                                                       --------         --------
              Total deferred credits                    1,661.5          1,700.2
                                                       --------         --------
                                                       $6,069.8         $6,475.6
                                                       ========         ========

                                       4



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

                                                          THREE MONTHS ENDED
                                                               MARCH 31,
                                                         1999            1998
                                                             (Unaudited)
                                                     (Millions except per share)
Operating Revenues:
       Electric                                        $    255.2        $276.6
       Electric interchange                                  94.0          96.3
       Gas                                                  123.1         116.6
       Diversified enterprises                               76.1          85.9
                                                       ----------     ----------
          Total                                             548.4         575.4
                                                       ----------     ----------

Operating Expenses:
       Fuel for electric plants                              51.4          55.7
       Power purchased                                       51.7          97.1
       Gas purchased for resale                              72.5          66.0
       Diversified enterprises                               81.5          94.7
       Other operating expenses                             110.4          79.8
       Maintenance                                           41.3          29.0
       Depreciation & amortization                           44.5          50.7
       Amortization of regulatory asset                       1.5             -
       General taxes                                         29.9          38.7
                                                       ----------     ----------
          Total                                             484.7         511.7
                                                       ----------     ----------
Operating Income                                             63.7          63.7
                                                       ----------     ----------
Other Income and Deductions:
       Miscellaneous-net                                     10.9          (1.5)
       Equity earnings in affiliates                          0.5           5.5
                                                       ----------     ----------
          Total                                              11.4           4.0
                                                       ----------     ----------
Income Before Interest
       Charges and Income Taxes                              75.1          67.7
                                                       ----------     ----------
Interest Charges:
       Interest expense                                      43.1          36.6
       Allowance for borrowed funds
          used during construction                          (1.2)          (1.1)
       Preferred dividend
          requirements of subsidiary                          5.0           4.9
                                                       ----------     ----------
          Total                                              46.9          40.4
                                                       ----------     ----------
Income Before Income Taxes                                   28.2          27.3
                                                       ----------     ----------
Income Taxes                                                 11.3           4.3
                                                       ----------     ----------
Net Income                                                   16.9          23.0
       Carrying amount over
          consideration paid for redeemed
          preferred stock of subsidiary                       0.8             -
                                                       ----------     ----------
Net Income Applicable to
       Common Stock                                         $17.7         $23.0
                                                       ==========     ==========
Earnings per common share (basic
       and diluted)                                         $0.25         $0.32
Cash dividends declared per
       common share                                         $0.31         $0.31
Cash dividends paid per
       common share                                         $0.31         $0.31
Weighted average number of
       common shares outstanding
       during period                                   69,919,287    71,701,253

                                       5

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

                                                          THREE MONTHS ENDED
                                                             MARCH 31,
                                                         1999           1998
                                                             (Unaudited)
                                                          (Millions of Dollars)

Net Income Applicable to Common Stock                      $17.7           $23.0
                                                           -----           -----

Other Comprehensive Income
     Foreign currency translation adjustments               (0.1)              -
     Unrealized gains on securities                          0.5               -
                                                           -----           -----
         Other comprehensive income, before tax              0.4               -
     Income taxes on other comprehensive income             (0.2)              -
                                                           -----           -----
     Other comprehensive income, net of tax                  0.2               -
                                                           -----           -----

Comprehensive Income                                       $17.9           $23.0
                                                           =====           =====

                                       6


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

                                                           THREE MONTHS ENDED
                                                               MARCH 31,
                                                         1999            1998
                                                             (Unaudited)
                                                         (Millions of Dollars)

CASH FLOWS FROM OPERATING ACTIVITIES
     Net income                                             $16.9         $23.0
     Items not requiring cash, net                           54.2          44.4
     Changes in assets and liabilities                     (129.4)         62.0
                                                           -------        -----

     Net cash provided (used) by operating activities       (58.3)        129.4
                                                           -------       ------

CASH FLOWS FROM INVESTING ACTIVITIES
     Construction expenditures                              (37.1)        (47.8)
     Other investing activities                             (17.4)         (8.5)
                                                            ------        ------

     Net cash used in investing activities                  (54.5)        (56.3)
                                                           -------        ------

CASH FLOWS FROM FINANCING ACTIVITIES
     Dividends on common stock                              (21.7)        (22.2)
     Reissuance of common stock                                 -           0.7
     Redemptions -
          Short-term debt                                  (123.4)       (115.6)
          Long-term debt of subsidiary                     (345.8)            -
          Preferred stock of subsidiary                      (8.6)            -
     Issuances -
          Short-term debt                                   239.3           8.9
          Long-term debt                                        -          92.4
     Other financing activities                             (79.4)          0.3
                                                           -------        ------

     Net cash used in financing activities                 (339.6)        (35.5)
                                                           -------        ------

     NET CHANGE IN CASH AND CASH EQUIVALENTS               (452.4)         37.6
     CASH AND CASH EQUIVALENTS
        AT BEGINNING OF YEAR                                518.1          33.0
                                                           -------        ------

     CASH AND CASH EQUIVALENTS
        AT END OF PERIOD                                    $65.7         $70.6
                                                           =======        ======

                                       7


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

                                                        MARCH 31,   DECEMBER 31,
                                                          1999          1998
                                                       (Unaudited)   (Audited)
                                                         (Millions of Dollars)
ASSETS

Utility Plant
   Electric (includes construction work
       in progress of $139.4 million and
       $177.7 million, respectively)                      $5,496.0      $5,481.8
   Gas (includes construction work
       in progress of $14.8 million and
       $15.3 million, respectively)                          690.5         686.9
                                                          --------      --------
                                                           6,186.5       6,168.7
Less - Accumulated depreciation                            1,736.6       1,713.7
                                                          --------      --------
                                                           4,449.9       4,455.0
Nuclear fuel under capital lease                              20.3          20.3
                                                          --------      --------
     Total utility plant                                   4,470.2       4,475.3
                                                          --------      --------
Investments and Other Assets                                   3.2           2.6
                                                          --------      --------
Current Assets
   Cash and cash equivalents                                  49.3         504.5
   Accounts receivable (less allowance
    for doubtful accounts of $5.5 million)
     Service                                                 116.6         105.9
     Other                                                    29.2          32.5
   Accrued unbilled revenue                                   64.4          82.6
   Materials and supplies, at average cost                    79.0          90.4
   Assets from commodity price risk
     management activities                                    33.9          26.0
   Prepayments and other                                      49.7          42.8
                                                          --------      --------
     Total current assets                                    422.1         884.7
                                                          --------      --------
Deferred Charges
   Transition period cost recovery                           457.3         457.3
   Other                                                     350.5         284.2
                                                          --------      --------
     Total deferred charges                                  807.8         741.5
                                                          --------      --------
                                                          $5,703.3      $6,104.1
                                                          ========      ========

                                       8


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

                                                        MARCH 31,   DECEMBER 31,
                                                          1999          1998
                                                       (Unaudited)    (Audited)
                                                         (Millions of Dollars)
CAPITAL AND LIABILITIES

Capitalization
    Common stock -
      No par value, 100,000,000 shares
      authorized; 75,643,937 shares issued,
      stated at                                           $1,186.0      $1,185.9
    Retained earnings - accumulated since 1/1/99              19.4           -
    Accumulated other comprehensive income                     0.2           -
    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                         911.9         892.2
    Preferred stock                                           52.9          57.1
    Company obligated mandatorily
      redeemable preferred stock                             194.5         199.0
    Long-term debt                                         2,078.7       2,158.5
                                                          --------      --------
           Total capitalization                            3,238.0       3,306.8
                                                          --------      --------

Current Liabilities
    Accounts payable                                         228.7         216.2
    Notes payable                                            197.5         147.6
  Long-term debt and lease obligations
      maturing within one year                               182.0         506.6
    Liabilities from commodity price
      risk management activities                              71.0          61.6
    Other                                                    108.9         150.5
                                                          --------      --------
           Total current liabilities                         788.1       1,082.5
                                                          --------      --------
Deferred Credits
    Accumulated deferred income taxes                        861.7         849.5
    Accumulated deferred investment tax credits               39.2          39.6
    Decommissioning liability                                574.2         567.4
    Other                                                    202.1         258.3
                                                          --------      --------
           Total deferred credits                          1,677.2       1,714.8
                                                          --------      --------
                                                          $5,703.3      $6,104.1
                                                          ========      ========

                                       9


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

                                                            THREE MONTHS ENDED
                                                                 MARCH 31,
                                                            1999          1998
                                                               (Unaudited)
                                                          (Millions of Dollars)
Operating Revenues:
    Electric                                              $255.2        $276.6
    Electric interchange                                    94.0          96.3
    Gas                                                    123.1         116.6
                                                          ------        ------
       Total                                               472.3         489.5
                                                          ------        ------

Operating Expenses and Taxes:
    Fuel for electric plants                                51.4          55.7
    Power purchased                                         51.7          97.1
    Gas purchased for resale                                72.5          66.0
    Other operating expenses                               110.4          79.8
    Maintenance                                             41.3          29.0
    Depreciation & amortization                             44.5          50.7
    Amortization of regulatory asset                         1.5           -
    General taxes                                           29.9          38.7
    Income taxes                                            13.7          10.7
                                                          ------        ------
       Total                                               416.9         427.7
                                                          ------        ------
Operating Income                                            55.4          61.8
                                                          ------        ------
Other Income and Deductions, Net                             6.2           1.6
                                                          ------        ------
Income Before Interest Charges                              61.6          63.4
                                                          ------        ------

Interest Charges and Other:
    Interest expense                                        39.8          34.1
    Allowance for borrowed funds
       used during construction                            (1.2)          (1.1)
                                                          ------        ------
       Total                                                38.6          33.0
                                                          ------        ------

Net Income                                                  23.0          30.4
    Less-Preferred dividend
       requirements                                          5.0           4.9
    Plus - Carrying amount over
       consideration paid for
       redeemed preferred stock                              0.8            -
                                                          ------        ------
Net Income Applicable to
    Common Stock                                           $18.8        $25.5
                                                          ======        ======

                                       10


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

                                                           THREE MONTHS ENDED
                                                                MARCH 31,
                                                            1999       1998
                                                              (Unaudited)
                                                          (Millions of Dollars)

Net Income Applicable to Common Stock                     $18.8      $25.5
                                                          -----      -----

Other Comprehensive Income
         Unrealized gains on securities                     0.4        -
         Income taxes on other comprehensive income        (0.2)       -
                                                          -----      -----
         Other comprehensive income, net of tax             0.2        -
                                                          -----      -----

Comprehensive Income                                      $19.0      $25.5
                                                          =====      =====

                                       11


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

                                                            THREE MONTHS ENDED
                                                                  MARCH 31,
                                                            1999           1998
                                                                (Unaudited)
                                                          (Millions of Dollars)

CASH FLOWS FROM OPERATING ACTIVITIES
     Net income                                             $22.9         $30.4
     Items not requiring cash, net                           55.5          47.4
     Changes in assets and liabilities                     (105.6)         61.7
                                                          -------         -----

     Net cash provided (used) by operating activities       (27.2)        139.5
                                                          -------         -----

CASH FLOWS FROM INVESTING ACTIVITIES
     Construction expenditures                              (37.1)        (47.8)
     Other investing activities                              (2.7)           0.6
                                                          -------         ------

     Net cash used in investing activities                  (39.8)        (47.2)
                                                          -------         ------

CASH FLOWS FROM FINANCING ACTIVITIES
     Dividends on preferred and common stock                 (4.3)        (27.2)
     Redemptions -
          Short-term debt                                  (123.4)        (77.1)
          Long-term debt                                   (345.8)          -
          Preferred stock                                    (8.6)          -
     Issuances -
          Short-term debt                                   173.3           -
          Long-term debt                                      -            52.4
     Other financing activities                             (79.4)          -
                                                          -------         ------

     Net cash used in financing activities                 (388.2)        (51.9)
                                                          -------         ------

NET CHANGE IN CASH AND CASH EQUIVALENTS                    (455.2)         40.4
CASH AND CASH EQUIVALENTS
        AT BEGINNING OF YEAR                                504.5          17.8
                                                          -------         ------

CASH AND CASH EQUIVALENTS
        AT END OF PERIOD                                    $49.3         $58.2
                                                          =======         ======

                                       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 March 31, 1999,
and audited December 31, 1998,  consolidated  financial  statements for Illinova
reflect all  adjustments  necessary to present fairly the  Consolidated  Balance
Sheets as of March 31, 1999, and December 31, 1998, the Consolidated  Statements
of  Income  for the  three  months  ended  March  31,  1999  and  1998,  and the
Consolidated  Statements of Cash Flows for the three months ended March 31, 1999
and 1998. In addition,  it is Illinova's and IP's opinion that the  accompanying
unaudited March 31, 1999, and audited December 31, 1998,  consolidated financial
statements  for IP reflect  all  adjustments  necessary  to  present  fairly the
Consolidated  Balance  Sheets as of March 31, 1999,  and December 31, 1998,  the
Consolidated  Statements of Income for the three months ended March 31, 1999 and
1998, and the  Consolidated  Statements of Cash Flows for the three months ended
March  31,  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


                                       13



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.


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 current
consumption.

         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.  The transition
charges  departing  customers  must  pay to IP  are  not  designed  to  hold  IP
completely harmless from resulting revenue loss because of the mitigation factor
described  below.  IP will be able to estimate  the  revenue  impact of customer
choice more  accurately  when the various  components of the transition  charges
calculation have been established.
         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 and is designed to provide incentive for management to continue cost
     reduction efforts and generate new sources of revenue;

                                       14


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,  and 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,  the amount of revenues earned
and the cost of doing business.


         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 $1,523.7 million, net of income taxes, charge against
retained earnings and an accumulated deficit in Illinova's consolidated retained
earnings balance of $1,616.0 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 $1,616.0 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,

                                       15


"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 three
months ended March 31, 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.  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  months  ended  March  31,  1999,  include
unrealized  gains on  securities,  foreign  currency  translations,  and related
income taxes. IP's March 31, 1999, other  comprehensive  income was comprised of
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's  estimated   liability  for   Manufactured  Gas  Plant  (MGP)  site
remediation is $61 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.  As of June 1998,
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 March 31, 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 are
deducted from common equity at the cost of the shares purchased. No shares of IP
common  stock were  purchased  during  the first  three  months of 1999.  At the
October 14, 1998, Illinova Board of Director's  meeting,  the 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, although
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 28 of this report.

                                       16


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 March 31, 1999, IP's and IEP's derivative assets and liabilities were
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 March 31, 1999, are presented below:

                         Volume-Fixed       Volume-Fixed          Average
                         Price Payor       Price Receiver           Term
Electricity
   IP                       2,300 MW           1,950 MW            1 year
   IEP                     11,388 MW          11,053 MW            1 year
Gas
   IEP (in thousands)       2,350 MMBtu        2,350 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 March 31, 1999, are presented below:

                                            Fair Value          Fair Value
      (Millions of dollars)                   Assets            Liabilities

Electricity
   IP                                          $27.2              $52.1
   IEP                                          24.6               34.0
                                                ----               ----
                                                51.8               86.1

Gas
   IEP                                           2.2                1.2
                                                 ---                ---
                                               $54.0              $87.3

        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.

                                       17


        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 March 31, 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
March 31, 1999, the notional amount of two emission  allowance swaps was 126,925
units,  with a  recorded  liability  of $15.6  million,  based on fair  value at
delivery date. The maximum  maturity of the swap  agreements is 10 years.  These
agreements do not fall under the scope of FAS 133. Due to the remote probability
of exercise, 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 March 31,  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 March 31, 1999,
follows:

                             Volume-Fixed       Volume-Fixed       Average
                             Price Payor       Price Receiver        Term
Electricity
   IP                           900 MW             300 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

                                       18


FAS 133. As of March 31, 1999,  the swap  liability  decreased to $23.5 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 March 31, 1999, are presented below:

                                      Fair Value              Fair Value
     (Millions of dollars)              Assets                Liabilities

Electricity
   IP                                    $6.0                    $18.6

        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.


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.
                                       19


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
were used to judge  segment  performance:  contribution  margin  and cash  flow;
return on net invested capital is no longer a corporate measure in 1999.

                                       20




Illinova Corporation
Three Months Ended March 31, 1999                        (Millions of Dollars)

                                                              Illinova
                                   Customer  Wholesale         Energy   Illinova  Other  Consoli-
                                   Service    Energy  Nuclear Partners  Generating        dated
1999
                                                                      
Revenues from external customers     376.7       94.1     1.5        -         -      -    472.3
Diversified enterprise revenue           -          -       -     46.4       28.3   1.4     76.1
Intersegment revenue (1)                 -      135.9    (0.7)       -          -     -    135.2
                                     -----------------------------------------------------------
   Total Revenue                     376.7      230.0     0.8     46.4       28.3    1.4   683.6
Depreciation and amortization
   expense                            18.5       25.6     2.0        -          -   (0.1)   46.0
Other operating expenses (1)         275.3      126.6    89.4     49.3       30.1    3.2   573.9
                                     -----------------------------------------------------------
   Operating income (loss)            82.9       77.8   (90.6)    (2.9)      (1.8)  (1.7)   63.7
Interest expense                      19.3       19.9     0.7        -          -    3.2    43.1
AFUDC                                 (0.4)      (0.8)      -        -          -    0.0    (1.2)
                                     -----------------------------------------------------------
   Net income (loss) before taxes     64.0       58.7   (91.3)    (2.9)      (1.8)  (4.9)   21.8
Income tax expense (benefit)          24.4       22.3   (35.7)    (0.7)       1.7   (0.7)   11.3
Miscellaneous - net                      -        0.1    (0.5)       -       (6.2)  (1.2)   (7.8)
Equity earnings in subsidiaries          -          -       -     (1.0)       0.4    0.1    (0.5)
Interest revenue                         -          -    (1.1)       -          -   (2.0)   (3.1)
                                     -----------------------------------------------------------
   Net income (loss) after taxes      36.7       36.3   (54.0)    (1.2)       2.3   (1.1)   21.9
Preferred dividend requirement and
   carrying amount over consideration
   paid for redeemed preferred stock   2.9        3.0    (0.9)       -          -   (0.8)    4.2
                                      ----------------------------------------------------------
Net income (loss) available
   to common                          36.7       33.3   (53.5)    (1.2)       2.3   (0.3)   17.7
- -----------------------------------------------------------------------------------------------------------------------------------
Other information -
   Total assets (3)                2,297.3    3,121.8   198.5     63.3      239.7  149.2 6,069.8
   Subsidiary's investment in
      equity method investees            -          -       -      9.5      188.5      -   198.0
   Total expenditures for additions
      to long-lived assets            22.9       14.5       -        -          -    0.9    38.3
- -----------------------------------------------------------------------------------------------------------------------------------
Corporate Measures -
   Contribution margin (4)            50.0       46.5   (53.4)    (1.2)       2.3    0.9    45.3
   Cash flow (5)                      42.1      (87.6) (106.3)    (1.7)      12.5   51.6   (89.4)
- -----------------------------------------------------------------------------------------------------------------------------------


(1)   Intersegment revenue priced at 2.9 cents per kwh delivered.
      Intersegment expense is reflected in other operating expenses for
      Customer Service.
(2)   Net Income (loss) before Clinton impairment loss.
(3)   Primary  assets for  Nuclear  include  decommissioning  assets,  shared
      general and intangible plant and nuclear fuel.
(4)   Contribution  margin  represented by net income before  financing costs
      (net-of-tax) and preferred dividend requirement.
(5)   Cash flow before financing activities.

                                       21




Illinova Corporation
Three Months Ended March 31, 1998                      (Millions of Dollars)

                                                              Illinova
                                   Customer  Wholesale         Energy   Illinova  Other  Consoli-
                                   Service    Energy  Nuclear Partners  Generating        dated
1998
                                                                      
Revenues from external customers     391.6       96.3     1.6        -         -      -    489.5
Diversified enterprise revenue           -          -       -     84.9        0.7   0.3     85.9
Intersegment revenue (1)                 -      111.8    (0.6)       -          -     -    111.2
                                     ------------------------------------------------------------
   Total Revenue                     391.6      208.1     1.0     84.9       0.7    0.3    686.6
Depreciation and amortization
   expense                            16.9        7.4    24.8        -          -   1.6     50.7
Other operating expenses (1)         244.7      150.7    84.0     89.8        4.0  (1.0)   572.2
                                     ------------------------------------------------------------
   Operating income (loss)           130.0       50.0  (107.8)    (4.9)      (3.3)  (0.3)   63.7
Interest expense                      17.1        5.7    21.5        -          -   (7.7)   36.6
AFUDC                                 (0.3)      (0.4)   (0.4)       -          -      -    (1.1)
                                     ------------------------------------------------------------
   Net income (loss) before taxes    113.2       44.7  (128.9)    (4.9)      (3.3)   7.4    28.2
Income tax expense (benefit)          46.4       16.7   (55.3)    (1.1)      (0.7)  (1.7)    4.3
Miscellaneous - net                      -        1.8       -     (0.1)         -   (0.2)    1.5
Equity earnings in subsidiaries          -          -       -     (2.0)      (3.5)     -    (5.5)
Interest revenue                         -          -       -        -          -      -       -
                                     ------------------------------------------------------------
   Net income (loss) after taxes      66.8       26.2   (73.6)    (1.7)       0.9    9.3    27.9
Preferred dividend requirement and
   carrying amount over consideration
   paid for redeemed preferred stock   1.8        0.7     2.5        -          -   (0.1)    4.9
                                      ----------------------------------------------------------
Net income (loss) available
   to common                          65.0       25.5   (76.1)    (1.7)       0.9    9.4    23.0
- -----------------------------------------------------------------------------------------------------------------------------------
Other information -
   Total assets                    1,766.9      717.1  2,772.3     56.4     174.6  131.5 5,618.8
   Subsidiary's investment in
      equity method investees            -          -       -      12.4     165.4      -   117.8
   Total expenditures for additions
      to long-lived assets            30.2       10.2     7.2        -          -    1.3    48.9
- -----------------------------------------------------------------------------------------------------------------------------------
Corporate Measures -
   Contribution margin (2)            75.6       28.1   (61.2)    (1.7)       0.9    5.0    46.7
   Cash flow (3)                      73.2       43.2   (81.6)     2.1        3.9   42.1    82.9
- -----------------------------------------------------------------------------------------------------------------------------------
Return on net invested capital (4)    5.9%       6.0%     N/A      5.2%      0.5%   N/A     1.3%


(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.
(2)  Contribution  margin  represented by net income before  financing costs
     (net-of-tax) and preferred dividend requirement.
(3)  Cash flow before financing activities.
(4)  Return on net invested capital calculated as contribution  margin divided
     by net invested capital.

                                       22


GEOGRAPHIC INFORMATION

(Millions of dollars)
- --------------------------------------------------------------------------------
Quarter ended March 31,                     1999        1998
- --------------------------------------------------------------------------------
Revenues: (1)
     United States                       $544.2       $575.4
     Foreign countries - seven              4.2            0
                                         ------       ------
                                         $548.4       $575.2
                                         ======       ======


(Millions of dollars)
- --------------------------------------------------------------------------------
March 31,                                  1999        1998
- --------------------------------------------------------------------------------
Long-lived assets: (2)
     United States                       $4,525.5    $4,597.4
     Foreign countries - nine               157.1       124.8
                                         --------    --------
                                         $4,682.6    $4,722.2
                                         ========    ========

(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.

                                       23


In 1998,  three  measures were used to judge segment  performance:  contribution
margin,  cash flow,  and return on net invested  capital.  In 1999, two measures
were used to judge  segment  performance;  contribution  margin  and cash  flow;
return on net invested capital is no longer a corporate measure in 1999.



Illinois Power
Three Months Ended March 31, 1999

                                                          Customer       Wholesale                                   Total
1999                                                      Service         Energy        Nuclear        Other        Company
                                                                                                        
Revenues from external customers                               $376.7           $94.1         $1.5           $ -         $472.3
Intersegment revenue (1)                                            -           135.9        (0.7)             -          135.2
                                                       -------------------------------------------------------------------------
  Total Revenue                                                 376.7           230.0          0.8             -          607.5
Depreciation and amortization expense                            18.5            25.6          2.0         (0.1)           46.0
Other operating expenses (1)                                    275.3           126.6         89.4           1.1          492.4
                                                       -------------------------------------------------------------------------
  Operating income (loss)                                        82.9            77.8       (90.6)         (1.0)           69.1
Interest expense                                                 19.3            19.9          0.7         (0.1)           39.8
AFUDC                                                           (0.4)           (0.8)            -           0.0          (1.2)
                                                       -------------------------------------------------------------------------
  Net income (loss) before taxes                                 64.0            58.7       (91.3)         (0.9)           30.5
Income tax expense (benefit)                                     24.4            22.3       (35.7)           0.6           11.6
Miscellaneous-net                                                   -             0.1        (0.5)         (0.4)          (0.8)
Interest revenue                                                    -               -        (1.1)         (2.2)          (3.3)
                                                       -------------------------------------------------------------------------
  Net income (loss) after taxes                                  39.6            36.3       (54.0)           1.1           23.0
Preferred dividend requirement and
  carrying amount over consideration
  paid for redeemed preferred stock                               2.9             3.0        (0.9)         (0.8)            4.2
                                                       -------------------------------------------------------------------------
Net income (loss) available to common                          $ 36.7          $ 33.3     $ (53.1)          $1.9         $ 18.8
- --------------------------------------------------------------------------------------------------------------------------------
Other information -
  Total assets (2)                                           $2,297.3        $3,121.8       $198.5        $ 34.4       $5,652.0
  Total expenditures for additions to long-lived
    assets                                                       22.9            14.5            -           0.9           38.3
Corporate Measures -
  Contribution margin (3)                                      $ 50.0          $ 46.7     $ (53.4)          $1.1         $ 44.4
  Cash flow (4)                                                  42.1          (87.6)      (106.3)          81.4         (70.4)
- --------------------------------------------------------------------------------------------------------------------------------


(1)   Intersegment  revenue  priced  at 2.9 cents  per kwh  delivered  for 1999.
      Intersegment expense is reflected in other operating expenses for Customer
      Service.
(2)   Primary assets for Nuclear include  decommissioning assets, shared general
      and intangible plant and nuclear fuel.
(3)   Contribution  margin  represented  by net income  before  financing  costs
      (net-of-tax) and preferred dividend requirement.
(4)   Cash flow before financing activities.

                                       24




Illinois Power
Three Months Ended March 31, 1998

                                                              Customer       Wholesale                                   Total
1998                                                          Service         Energy        Nuclear        Other        Company
                                                                                                        
Revenues from external customers                               $391.6           $96.3        $ 1.6           $ -         $489.5
Intersegment revenue (1)                                            -           111.8        (0.6)             -          111.2
                                                       -------------------------------------------------------------------------
  Total Revenue                                                 391.6           208.1          1.0             -          600.7
Depreciation and amortization expense                            16.9             7.4         24.8           1.6           50.7
Other operating expenses (1)                                    244.7           150.7         84.0         (1.9)          477.5
                                                       -------------------------------------------------------------------------
  Operating income (loss)                                       130.0            50.0      (107.8)           0.3           72.5
Interest expense                                                 17.1             5.7         21.5        (10.2)           34.1
AFUDC                                                           (0.3)           (0.4)        (0.4)             -          (1.1)
                                                       -------------------------------------------------------------------------
  Net income (loss) before taxes                                113.2            44.7      (128.9)          10.5           39.5
Income tax expense (benefit)                                     46.4            16.7       (55.3)         (0.6)            7.2
Miscellaneous-net                                                   -             1.8            -           0.3            2.1
Interest revenue                                                    -               -            -         (0.2)          (0.2)
                                                       -------------------------------------------------------------------------
  Net income (loss) after taxes                                  66.8            26.2       (73.6)          11.0           30.4
Preferred dividend requirement                                    1.8             0.7          2.5         (0.1)            4.9
                                                       -------------------------------------------------------------------------
Net income (loss) available to common                          $ 65.0           $25.5     $ (76.1)        $ 11.1         $ 25.5
- --------------------------------------------------------------------------------------------------------------------------------
Other information -
  Total assets                                               $1,766.9         $ 717.1     $2,772.3        $ 84.4       $5,340.7
  Total expenditures for additions to long-lived
   assets long-lived assets                                    $ 30.2           $10.2        $ 7.2         $ 1.3         $ 48.9

- --------------------------------------------------------------------------------------------------------------------------------
Corporate Measures -
  Contribution margin (2)                                      $ 75.6           $28.1     $ (61.2)         $ 5.1         $ 47.6
  Cash flow (3)                                                  73.2            43.2       (81.6)          31.3           66.1
  Return on net invested capital (4)                             5.9%            6.0%          N/A           N/A           1.3%
- --------------------------------------------------------------------------------------------------------------------------------


(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.
(2)   Contribution  margin  represented  by net income  before  financing  costs
      (net-of-tax) and preferred dividend requirement.
(3)   Cash flow before financing activities.
(4)   Return on net invested capital calculated as contribution  margin divided
      by net invested capital.

                                       25


GEOGRAPHIC INFORMATION

(Millions of dollars)
- --------------------------------------------------------------------------------
Quarter ended March 31,                     1999        1998
- --------------------------------------------------------------------------------
Revenues: (1)
     United States                       $472.3       $489.5
                                         ======       ======

(Millions of dollars)
- --------------------------------------------------------------------------------
March 31,                                  1999        1998
- --------------------------------------------------------------------------------
Long-lived assets: (2)
     United States                       $4,436.1    $4,536.5
                                         ========    ========

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

RESTATEMENT OF THE CONSOLIDATED FINANCIAL STATEMENTS AS OF MARCH 31, 1999 AND AS
OF DECEMBER 31, 1998

In  February  2000,  Illinova  and  IP  restated  their  consolidated  financial
statements  for the year ended  December  31,  1998 to reflect a revision to the
initial  estimate of the  "Transition  period cost  recovery"  regulatory  asset
established in December 1998 coincident with the impairment of the Clinton Power
Station.  The  effect  of  this  revision  was to  decrease  the  amount  of the
regulatory asset at December 31, 1998, and correspondingly  increase the related
impairment charge by $325.7 million ($196.5 million net of taxes). The impact of
this   revision   on   the   consolidated    financial    statements    follows:



- ------------------------------------------------------------------------------------------
                                      March 31, 1999               December 31, 1998
- -------------------------------------------------------------------------------------------
                                 As Previously   As Restated    As Previously   As Restated
                                    Reported                       Reported
- -------------------------------------------------------------------------------------------
                                     (Millions of Dollars)          (Millions of Dollars)
                                                                      
Illinova Corporation
Common stock-No par value       $1,319.8          $1,123.3       $1,319.7       $1,123.2

Illinois Power Company
Common stock-No par value       $1,382.5          $1,186.0       $1,382.4       $1,185.9
- -------------------------------------------------------------------------------------------

As a result of the quasi-reorganization, there was no effect of this revision on
"Retained Earnings." For more information, see "Accounting Matters" of "Notes to
Consolidated Financial Statements" on page 15 of this report.


                                       26


              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  in  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.

                                       27


        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.


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.
Regulatory  approvals for the transfer of these assets and for IPMI's  marketing
activities are being sought.

RESTATEMENT OF THE CONSOLIDATED FINANCIAL STATEMENTS FOR THE YEAR ENDED DECEMBER
31, 1998 AND AS OF MARCH 31, 1999

In February 2000,  Illinova and IP restated their  financial  statements for the
year ended  December  31, 1998 to reflect a revision to the initial  estimate of
the "Transition  period cost recovery"  regulatory asset established in December
1998 coincident with the impairment of the Clinton Power Station.  The effect of
this revision was to decrease the amount of the regulatory asset at December 31,
1998,  and  correspondingly  increase  the related  impairment  charge by $325.7
million  ($196.5  million net of tax).  The net effect of this  revision  was to
increase the previously reported net loss by $196.5 million, or $2.74 per common
share (basic and  diluted).  As a result of the  quasi-reorganization  described
below,  there was no effect of this  revision on "Retained  earnings;"  however,
"Total common stock equity" was reduced by $196.5 million.  The financial tables
and  stateemnts,  the  notes  to  the  consolidated  financial  statements,  and
management's  discussion  and  analysis of  financial  condition  and results of
operations in the 10-Q/A have been modified to reflect these changes.


LIQUIDITY AND CAPITAL RESOURCES
     CAPITAL RESOURCES AND REQUIREMENTS

        Cash  flows  from  operations  during  the first  three  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 March 31,  1998,  as a result of higher  fossil
maintenance  costs,  increased  marketing  expenses,  and higher  Clinton  costs
combined  with lower  revenues  caused by 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

                                       28


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 put
in place a $130 million  Revolving  Credit  Agreement in January 1999, which had
$64 million of capacity  available at March 31, 1999.  Prior to 1999 IP has 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.  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 $130 million  capacity  under the existing  shelf
registration  should meet its cash  requirements  through the remainder of 1999.
Illinova and IGC are developing additional financing capabilities to meet future
needs.

        Through May 10, 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 83,780 shares
of various serial  preferred stock series.  These  securities were retired using
funds from securitization proceeds received in December 1998.

        IP's  capital  requirements  for  construction  were  approximately  $37
million and $48 million  during the three  months ended March 31, 1999 and 1998,
respectively.  Through 2000, IP plans to complete improvements in its generation
facilities  including  pollution  control  equipment and new combustion  turbine
peaking units.  Illinova estimates that it will spend approximately $370 million
for IP construction  expenditures in 1999. IP construction expenditures for 1999
through 2003 are expected to total  approximately $1.3 billion.  In light of the
December 1998 decision to exit Clinton and resulting Clinton impairment, Clinton
capital  expenditures are expensed as incurred and are not included in the above
estimates.  On March 2, 1999, IP deposited $62.1 million for partially  depleted
nuclear fuel in the Clinton  reactor with 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.

                                       29


        In  addition  to  IP  construction   expenditures,   Illinova's  capital
expenditures  for 1999  through  2003 are  expected to include  $592 million for
mandatory  debt  retirement  and  approximately  $600 million  target levels for
investment opportunities by the non-regulated  subsidiaries.  In addition, IPSPT
has long-term debt maturities of $86.4 million in each of the above years.

        IP currently has the  authority to issue $250 million in long-term  debt
and $500 million in short-term  debt,  which  includes $350 million in committed
bank lines of credit. Of these authorized  amounts, IP had $229 million at March
31, 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.

        Presently, IP's mortgage bonds are rated Baa1 by Moody's, BBB+ by Duff &
Phelps  and BBB by  Standard  & Poor's.  IP's  preferred  stock is rated Baa2 by
Moody's,  BBB- by Duff & Phelps and BB+ by Standard & Poor's.  Illinova's senior
and medium-term  notes have a rating of Baa3 from Moody's and BBB- from Standard
& Poor's.  On July 6, 1998,  a change in outlook  was issued.  The outlook  from
Moody's  changed from stable to negative and the outlook from  Standard & Poor's
changed from positive to stable.

        On March 4, 1999,  Moody's  placed all of the securities of Illinova and
IP under  review  for  possible  downgrade,  citing  erosion of cash flow and an
expected  increase in leverage caused by the extended  Clinton outage.  On April
18, 1999, Moody's confirmed the security ratings of Illinova and IP, and removed
the securities from review for possible  downgrade  following the NRC's decision
to allow the  restart  of  Clinton  and the  announcement  of an  interim  sales
agreement  with AmerGen to purchase and operate  Clinton.  See "PECO  Agreement"
section  which  follows  on page 30 for  additional  information  regarding  the
interim sales agreement.


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 has not resumed operation.

        In January 1997, the Nuclear  Regulatory  Commission (NRC) named Clinton
among  plants  having a trend of  declining  performance  and, in January  1998,
placed  Clinton on its "Watch List" of nuclear  plants that  require  additional
regulatory oversight.

        In late 1997, an independent team conducted an ISA to thoroughly  assess
Clinton's  performance,  and an NRC team performed an evaluation to validate the
ISA results.  Both teams  concluded  that the  underlying  reasons for Clinton's

                                       30


performance problems were ineffective  leadership throughout the organization in
providing  standards of excellence,  complacency  throughout  the  organization,
barrier weaknesses, and weaknesses in teamwork.

        In January  1998,  IP and PECO  announced an agreement  under which PECO
provides  management  services for Clinton,  with IP  maintaining  the operating
license and ultimate oversight for the plant. PECO employees have assumed senior
positions at Clinton but the plant remains staffed primarily by IP employees. IP
selected PECO because it believed that bringing in PECO's experienced management
team would be the fastest and most  efficient  way to return  Clinton to service
and to a superior level of operation.

        In  February  1998,  IP filed with the NRC  Clinton's  Summary  Plan for
Excellence,  a comprehensive set of strategies and associated  actions necessary
to improve performance, permit safe restart of the plant, and achieve excellence
in operations.  IP is implementing  the actions required prior to plant restart.
The NRC is conducting a formal review process in parallel with IP's recovery and
restart program.

        On  April  27,  1999,  IP  received  notification  from the NRC that the
actions  required  prior to  restart  have  been  satisfied,  thus  lifting  the
regulatory agency's constraints on restarting the plant.

        Due to uncertainties of deregulated  generation  pricing in Illinois and
to various  operation  and  management  factors,  Illinova's  and IP's Boards of
Directors  decided in  December  1998 to sell or close  Clinton.  This  decision
resulted in an impairment of Clinton-related  assets and accrual of exit-related
costs of $1,523.7 million, net of income taxes, which was recognized as a charge
against earnings.

        The  prolonged  outage  at  Clinton  is  having  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. 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 deposit  $62.1 million cash for the  acquisition  of core fuel in
March  1999,  with the Fuel  Company  Trustee for the  benefit of  investors  in
secured Notes of the Fuel Company.


PECO 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 owned  jointly by PECO  Energy
Company  (PECO) and  British  Energy.  IP also  announced  a revised  management
agreement (Agreement) with PECO for the operation of Clinton commencing April 1,
1999. PECO will continue to manage the station pending a final agreement between
the parties and consummation of the sale.

        Under the  Agreement,  starting  April 1,  1999,  PECO is  assuming  the
plant's  direct  operating  and capital  expenditures,  regardless  of operating
status. This eliminates the Company's exposure to the uncertainty  regarding the

                                       31


costs of returning Clinton to service and subsequent  operations.  In return for
transferring  this  financial  risk,  the Company has  modified  the  management
agreement with PECO to incorporate a new fee structure.  The Agreement obligates
IP to pay a management  fee to PECO  calculated  by  multiplying  a fixed dollar
amount per MWH times 80 percent of the  electricity  generated at Clinton during
the remainder of 1999. The financial  impact of this obligation is contingent on
three variables:  (1) whether Clinton restarts; (2) the capacity levels at which
it  subsequently  operates;  and (3) 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  between  April 1 and December 31, 1999 could equal or
exceed the 1999  Clinton-related  O&M and capital  costs for which PECO  assumed
full  responsibility  commencing  April 1,  1999.  Under the  interim  agreement
AmerGen  has no  obligation  to buy the plant if it has not  actually  generated
electric  energy and been  synchronized  to the grid by December 31,  1999.  For
further information,  see the management agreement, which is attached as exhibit
A to the interim agreement filed as Exhibit 10.1 to this document.

        Under  the  terms  of the  interim  agreement,  AmerGen  will pay IP $20
million for Clinton  (including  nuclear fuel) and IP will have an obligation to
pay AmerGen $275 million to assume the Clinton decommissioning  liability. It is
anticipated that IP will transfer $95 million in its decommissioning  trust fund
and make  payments  of $30  million  in each of the  next six  years to meet its
decommissioning  obligation.  This compares  favorably with the $529 million NPV
that IP reported as its decommissioning liability as of December 31, 1998.

        IP has agreed to negotiate exclusively with AmerGen until June 15, 1999.
While the interim agreement provides a framework for further negotiations toward
a final agreement to sell Clinton to AmerGen,  several  significant steps remain
before a sale can be  completed.  Significant  income tax issues  related to the
funding of  decommissioning  costs,  similar to those being  addressed  with the
Internal Revenue Service by parties to other pending sales of nuclear generating
stations,  must be resolved to the mutual  satisfaction  of IP and AmerGen.  The
parties must conclude a definitive agreement.  The NRC must approve the sale and
the transfer of the operating  license;  the ICC must approve the sale; and, the
FERC must approve the PPA.


REGULATORY MATTERS

     FOSSIL GENERATION FILING

        IP  filed a  notice  with the ICC in April  1999,  as  required  by law,
advising of its  intention  to sell its fossil  generating  assets to  Illinova.
Subsequently,  Illinova intends to transfer those assets to its IPMI subsidiary.
IPMI, which was  incorporated in April 1999, will become a wholesale  generation
and power  marketing  company.  The proposed  transfer of assets from IP will be
done pursuant to Section 16-111(g) of The Customer Choice and Rate Relief Act of
1997,  which permits  transfer of utility assets on successful  demonstration to
the Commission that certain financial and reliability  criteria will be met. The
Commission  will have 90 days to review the filing and make its decision.  Also,
IP intends  to make a filing  with the FERC  during the second  quarter of 1999,
seeking approval of a proposed Purchase Power Agreement between IP and IPMI.

                                       32


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 31).  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 has agreed to
provide the Attorney General with a reliability report. The Attorney General and
the Company  have  mutually  agreed on an  independent  committee of two outside
experts to review the report.  The company believes this approach will lead to a
settlement of the complaint  without a material  adverse effect.  Although there
were limited calls for voluntary conservation,  and interruptible customers were
curtailed, no firm load was interrupted or curtailed during all of 1998.


SOYLAND POWER COORDINATION AGREEMENT

        The FERC approved an amended Power Coordination  Agreement (PCA) between
Soyland  and IP in July 1997.  Under the  amended  PCA,  Soyland  was allowed to
prepay an Elected Capacity Reduction Fee associated with a unilateral  reduction
in its base capacity  charge under the PCA. In December  1997,  Soyland signed a
letter of intent to pay in advance the remainder of its base capacity charges in
the PCA.  Soyland  obtained the  necessary  financing and  regulatory  approvals
during the second quarter of 1998. During the first quarter of 1998, IP received
$30 million from Soyland and the remaining  $40 million was received  during the
second quarter of 1998. The prepayment was deferred and was being  recognized as
interchange  revenue  evenly  over the initial  term of the PCA,  which was from
September 1, 1996 through August 31, 2006. In March 1999,  Soyland and IP signed
a new PCA agreement  and filed this  agreement  with 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 the  deferred  revenue from the  prepayment  of the base  capacity  charge as
discussed  above.  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

                                       33


closed  the  audits  for all  previously  disputed  years.  As a  result  of the
settlements,  IP electric  customers  received refunds totaling $15.1 million in
the first quarter 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
prior to the third quarter of the year 2000. The final rule on delivery  service
tariffs is expected in early August.

        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

                                       34


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 is
providing  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
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,  barges, etc., fuel
suppliers,   electric  and  gas  transmission   and   distribution   facilities,
substations  and  transformers,  meters,  building  systems  such  as  HVAC  and
security, and financial institutions.

                                       35


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

                                     Illinova Status
                                       March 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)      81        06/30/99   e          74      10/31/99   e

Implementation -
  (Important to
   Operations)            87        05/31/99   e          73      10/31/99   e

Contingency Planning      20        06/30/99   e          35      06/30/99   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.

                                       36


                                  IP Status
                                  March 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)     81        06/30/99   e         79      10/31/99   e

Implementation -
  (Important to                                                             ***
   Operations)           87        05/31/99   e         82      10/31/99   e

Contingency Planning     20        06/30/99   e         41      06/30/99   e

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

** It is currently  projected  that all IP mission  critical items will be fully
Year 2000 ready by June 30, 1999,  with the  exception  of one process  computer
system at Clinton.  However,  Clinton still plans to be Year 2000 ready, per NRC
requirements,   by  developing  contingency  plans  that  will  allow  continued
operation.

*** It is currently  projected that all IP important to operations items will be
fully Year 2000 ready by June 30,  1999,  with the  exception  of three  process
computer  systems at Clinton and one process computer system in our fossil power
system.  Contingency  plans  for these  systems  are  being  developed  to allow
continued operations.

        IT systems  (such as  billing,  payroll,  etc.) and  infrastructure  are
approximately 84% complete, with 100% completion projected by 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

                                       37


its regional  council  (MAIN) in  assessment  and  renovation of the grid and in
developing contingency plans to minimize any unexpected Year 2000 grid problems.
IP  participated  in the  April  NERC  drill  and is also  participating  in the
September NERC drill.

        NERC has recommended that all "mission  critical" systems needed to meet
demand and  reliability  obligations  be Year 2000 ready by June 30, 1999. IP is
working  diligently  to meet  the  June  30,  1999,  deadline.  It is  currently
projected that all of IP's power plants and field  transmission and distribution
items  will be fully  Year 2000  ready by that date  with the  exception  of one
process computer system at Clinton. Clinton still plans to be Year 2000 ready by
June 30, 1999, per NRC requirements,  by developing  contingency plans that will
allow continued operation.

        The  total  cost for  achieving  Year 2000  readiness  for  Illinova  is
estimated to be  approximately  $20.5 million  through 1999.  Through the end of
March 1999,  $11.8  million,  or 57% of the total $20.5  million had been spent.
Invoicing is lagging a few months behind when the actual work is completed,  and
Clinton has had to  reschedule  some tasks to a later date to coincide  with the
plant startup schedule.

        Development of contingency plans has begun and are focused on Illinova's
"mission critical" business processes.  Contingency plans are being developed in
accordance  with industry  guidelines,  such as NERC and the General  Accounting
Office,  and involve 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.

        Illinova is currently assessing potential worst-case  scenarios.  Such a
scenario  might  include  one or both of the  following  events:  winter  storms
coupled with a significant  Year 2000 system  problem that  compounds  emergency
response  efforts  and/or  loss of a  major  telecommunications  carrier  causes
disruptions in dispatching generation, dispatching emergency response crews, and
communications with financial institutions.

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


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 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, AZ 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.

                                       38


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


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.

     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  are $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 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 March
31, 1999, was $10.4 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.

                                       39


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.  Expenses incurred as a result of the
shortage have had a material adverse 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
trading business.  Income from interchange sales was $382 million higher than in
1997 due to increased sales volumes and higher prices.

        IP expects to have in excess of 400 MW of additional  generation on line
for the summer of 1999. 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 plans to install  before the summer of
1999. Total cost for the two projects is estimated at $87 million. IP also plans
to refurbish nine gas turbines  already in service at a cost of $13 million.  In
addition,  the restructuring of the Soyland PCA agreement freed up an additional
287 MW of capacity.  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 March 31, 1999 AND 1998

         Electric  Operations - Electric  revenues for the first quarter of 1999
decreased  $21.4 million  compared to the first 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.  The rate decrease resulted in revenue reductions
of $17.4 million in the first  quarter of 1999.  The removal of $11.3 million in
excise and  municipal  taxes from  revenue  and  general  taxes also  negatively
impacted electric revenues.  These reductions were partially offset by increased
sales in 1999. Electric interchange revenues decreased $2.3 million. Interchange
activity  decreased  $59.0 million along with a $3.4 million  expense to reflect
mark-to-market for forward contracts and options. These decreases were offset by

                                       40


a $60.1  million  revenue  recognition  resulting  from the  restructuring  of a
Soyland Power Cooperative power supply contract. Power purchased decreased $45.4
million due largely to decreased interchange activity.  During the quarter, fuel
for electric  plants  decreased  $4.3 million due to  decreased  generation  and
decreased  emission allowance costs. These factors combined to increase electric
margin $26.0 million for the quarter.

         Kilowatt hour (kwh) sales to ultimate consumers  increased 6.5% for the
quarter due to increases of 11.3% and 9.5% in the residential and the commercial
markets, respectively. Heating degree days increased approximately 12% from 1998
which contributed to the increase in sales to the temperature-sensitive markets.

         For the first quarter of 1999 and 1998,  Clinton was unavailable due to
the continued outage which began September 6, 1996. The equivalent  availability
for IP's coal-fired  plants was 77.5% and 79.5% for the three months ended March
31, 1999 and 1998, respectively.

         Gas Operations - For the quarter,  gas margin  remained  constant.  Gas
revenues  increased  $6.5  million  reflecting  a 10%  increase  in therm  sales
(excluding  transport)  caused by colder winter  weather.  Gas  purchased  costs
increased $6.5 million due to the higher consumption.

        Operation and Maintenance  Expenses - Of the current quarter increase of
$42.9 million, $29.0 million is due to higher operating and maintenance expenses
associated  with the  Clinton  outage.  This $29.0  million  increase in Clinton
expenses  includes  $12.4  million of costs  which  would  have been  considered
capital  additions  had Clinton not been  impaired.  For more  information,  see
"Clinton Power Station" of the  "Management's  Discussion and Analysis" on pages
13-14 of this report.

        Depreciation  and  amortization  -  The  decrease  in  depreciation  and
amortization  for the first  quarter of 1999  compared to 1998 was $6.2 million.
Due to the Clinton impairment,  nuclear depreciation decreased approximately $23
million but was offset by approximately  $18 million for the amortization of the
adjustment to fair value for the fossil generation assets.

        Diversified  enterprises  - Due  primarily  to decreased  power  trading
activity at IEP, diversified  enterprise revenues decreased $9.8 million for the
first quarter of 1999, which was offset by a decrease in diversified  enterprise
expenses of $13.2 million.

        Miscellaneous - net - Of the current quarter  increase of $12.4 million,
$6.2 million is income from IGC  investments  not accounted for under the equity
method.  Interest income increased $3.1 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. Revenues from non-utility  operations also increased in the first quarter
of 1999.

        Interest  expense - The increase in interest  expense of $6.5 million in
the first  quarter of 1999 is  primarily  the result of  interest  on  increased
long-term   debt  and  the   adjustment   in  the  net  present   value  of  the
decommissioning  liability,  offset by lower  interest  charges  resulting  from
reduced short-term borrowings in 1999.

                                       41


        Earnings  per Common  Share - The earnings per common share for Illinova
during the first quarter 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

Customer Service
For the quarter,  both the contribution margin and cash flow measures were lower
than for the corresponding  quarter in 1998, primarily due to decreased electric
revenues as discussed below.

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;
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,  primarily due to decreased
electric revenues as discussed below.

Retail electric revenues,  excluding interchange sales, for the first quarter of
1999  decreased  7.7% over the first quarter of 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 first  quarter of 1999 compared to the same period
in 1998.

Transmission, Distribution and Sale of Natural Gas
Revenues are derived  through  regulated  tariffs.  During the first  quarter of
1999, revenues from gas sales and transportation were up 5.5%, while therms sold
and  transported  were up 7.7% over the first  quarter of 1998.  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
decreased  0.2%  during the period due to an  increase  in gas costs,  offset by
decreases in both therms sold and therms transported.

Wholesale Energy
Factors leading to the increased contribution margin during the first quarter of
1999 compared to 1998 include: higher intersegment revenues in 1999 due to a new
pricing agreement;  higher purchased power costs, partially offset by lower fuel
costs, due to fossil generating  stations having extended outages during 1999; a
one-time credit to electric  interchange  revenues from the  restructuring  of a
power supply  contract;  market losses  recorded on forward  power  purchase and
sales  contracts  as  part  of  the  wholesale  trading  business;   and  higher
depreciation expense due to the revaluation of fossil assets during the December
1998 quasi-reorganization.

Cash flow is lower than 1998 due to cash  received in 1998  related to the power
supply contract  buyout,  increased  expenditures  for major capital projects in
1999, payments in 1999 for prepaid fuel purchases, as well as changes in current
assets and liabilities due to normal operating activity.

                                       42


Wholesale  Energy provided power to the Customer  Service Group at 2.9 cents per
kwh during the first Quarter of 1999 compared to 2.5 cents per kwh in 1998.

Nuclear
IP's only nuclear  generating  station,  Clinton,  did not generate  electricity
during the first  quarter of either 1999 or 1998.  Its only  revenues were those
paid by  customers  under a  tariff  rider to fund  the  decommissioning  trust.
Nuclear's results were unfavorably  affected by higher operating and maintenance
expenses and capital being expensed in 1999.

Illinova Energy Partners, Inc.
Although negative,  contribution  margin is slightly more favorable than in 1998
due to increased  revenues  and margin  earned on  electricity  and natural gas,
offset by continuing  investment in future growth and market penetration in both
the Midwest and Western United States.

Illinova Generating Company
IGC's  positive  contribution  margin  during the first quarter of 1999 compared
with the first quarter of 1998 reflect  improvement due primarily to an increase
in income from investing activities. The increase in cash flows is attributed to
increased distributions from project investments.

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 page 19 for additional information.


RESULTS OF OPERATIONS - ILLINOIS POWER SEGMENTS OF BUSINESS

Customer Service
For the quarter,  both the contribution margin and cash flow measures were lower
than for the corresponding  quarter in 1998, primarily due to decreased electric
revenues as discussed below.

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;
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 first quarter of
1999  decreased  7.7% over the first quarter of 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 first  quarter of 1999 compared to the same period
in 1998.

                                       43


Transmission, Distribution and Sale of Natural Gas
Revenues are derived  through  regulated  tariffs.  During the first  quarter of
1999, revenues from gas sales and transportation were up 5.5%, while therms sold
and  transported  were up 7.7% over the first  quarter of 1998.  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
decreased  0.2%  during the period due to an  increase  in gas costs,  offset by
decreases in both therms sold and therms transported.

Wholesale Energy
Factors leading to the increased contribution margin during the first quarter of
1999 compared to 1998 include: higher intersegment revenues in 1999 due to a new
pricing agreement;  higher purchased power costs, partially offset by lower fuel
costs, due to fossil generating  stations having extended outages during 1999; a
one-time credit to electric  interchange  revenues from the  restructuring  of a
power supply  contract;  market losses  recorded on forward  power  purchase and
sales  contracts  as  part  of  the  wholesale  trading  business;   and  higher
depreciation expense due to the revaluation of fossil assets during the December
1998 quasi-reorganization.

Cash flow is lower than 1998 due to cash  received in 1998  related to the power
supply contract  buyout,  increased  expenditures  for major capital projects in
1999, payments in 1999 for prepaid fuel purchases, as well as changes in current
assets and liabilities due to normal operating activity.

Wholesale  Energy provided power to the Customer  Service Group at 2.9 cents per
kwh during the first quarter of 1999 compared to 2.5 cents per kwh in 1998.

Nuclear
IP's only nuclear  generating  station,  Clinton,  did not generate  electricity
during the first  quarter of either 1999 or 1998.  Its only  revenues were those
paid by  customers  under a  tariff  rider to fund  the  decommissioning  trust.
Nuclear's results were unfavorably  affected by higher operating and maintenance
expenses and capital being expensed in 1999.

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 "IP Segments of Business" in the  footnotes to the  financial  statements on
page 23 for additional information.

                                       44


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 is  comprised  basically  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  that it has
obtained.  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 March 31,  1998,  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 March 31, 1999, as compared to VaR at December 31, 1998, is given below.

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

Illinova, including IP debt                $9.2                   $14.9

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

        Contributing  factors to the  decrease  in VaR were  retirement  of high
coupon  debt with  maturities  extending  past the year 2020 and an  increase in
commercial  paper levels from that at year end.  The 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.

                                       45


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 quarter ended March 31, 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 March 31, 1999, and December 31,
1998, as restated using a five day holding period follow:

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

IP                                         $0.6                   $1.4
IEP                                        $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 & 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.

                                       46


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

        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
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.

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 March 31, 1999, IGC
had invested $169 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 $47
million in Asia and $119 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 March 31, 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  market  risk 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 March 31,  1999,
calculated  based on a 95 percent  confidence level and a one day holding period
follows:

- --------------------------------------------------------------------------------
(Millions of dollars)                               Value-at-Risk
- --------------------------------------------------------------------------------

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

                                       47


ITEM 6. Exhibits and Reports on Form 8-K

   (a)   Exhibits

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

   (b)   Reports on Form 8-K since December 31, 1998:

         Report filed on Form 8-K on February 12, 1999
                                 Item  7: Illinova announces continued
                                 work toward restarting Clinton Power
                                 Station and pursuit of negotiations
                                 with potential buyers.

         Report filed on Form 8-K/A on March 3, 1999
                                 Item 5, Other Events: Press release: Illinova
                                 releases 1998 year end earnings.
                                 Item 7, Exhibits: Illinova Consolidated
                                 Income Statements.

         Report filed on Form 8-K/A 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.

                                       48


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:  May 17, 1999


                                       49


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:  May 17, 1999


                                       50



EXHIBIT INDEX


                                                     PAGE NO. WITHIN
                                                   SEQUENTIAL NUMBERING
EXHIBIT            DESCRIPTION                            SYSTEM

  10             Material Contracts                      52 - 118

  27             Financial Data Schedule UT
                 (filed herewith)



                                       51