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Financial news release

Ameren Announces Third Quarter 2008 Earnings
     -  Earnings Decline on Milder Weather, Higher Fuel and Reliability Costs

     -  2008 EPS Guidance Range Narrowed

     -  New Electric and Gas Distribution Rates Authorized in Illinois

     -  Available Liquidity Remains Solid

ST. LOUIS, Nov. 4 /PRNewswire-FirstCall/ -- Ameren Corporation (NYSE: AEE) today reported third quarter 2008 net income in accordance with generally accepted accounting principles (GAAP) of $204 million, or 97 cents per share, compared to third quarter 2007 GAAP net income of $244 million, or $1.18 per share. Excluding certain items in each year, Ameren recorded third quarter 2008 core (non-GAAP) net income of $246 million, or $1.17 per share, compared to third quarter 2007 core (non-GAAP) net income of $277 million, or $1.33 per share.

Core (non-GAAP) earnings per share in the third quarter of 2008 were lower than core (non-GAAP) earnings per share in the same period in 2007. The negative impacts of milder summer weather, higher fuel prices and increased spending on utility distribution system reliability, among other things, more than offset the positive impacts of higher electric margins from non-rate- regulated generation operations and the timing benefit of seasonally redesigned electric rates in Illinois.

The following items are excluded from third quarter 2008 and third quarter 2007 core (non-GAAP) earnings:

    --  Net unrealized mark-to-market losses from nonqualifying hedges reduced
        third quarter 2008 net income by $36 million as compared to net
        unrealized gains of $5 million in the third quarter of 2007.  These
        unrealized gains and losses primarily related to financial instruments
        that were acquired to mitigate the risk of rising diesel fuel price
        adjustments embedded in coal transportation contracts for the period
        2008 through 2012. The value of nonqualifying hedges will vary over
        time based on then current market prices.
    --  The net costs associated with the Illinois comprehensive electric rate
        relief and customer assistance settlement agreement reached in 2007
        reduced net income by $6 million in the third quarter of 2008 as
        compared to a reduction of $38 million in the third quarter of 2007.

Net income in accordance with GAAP for the first nine months of 2008 was $548 million, or $2.61 per share, compared to $510 million, or $2.46 per share, for the first nine months of 2007. Excluding certain items in each year, Ameren recorded core (non-GAAP) net income of $525 million, or $2.50 per share for the first nine months of 2008, compared to core (non-GAAP) net income of $560 million, or $2.70 per share for the first nine months of 2007. A reconciliation of GAAP to core (non-GAAP) earnings per share is as follows:


                                Third Quarter              Nine Months
                              2008         2007         2008         2007
    GAAP earnings per share  $0.97        $1.18        $2.61        $2.46
      Net unrealized
       mark-to-market
       (gains)/losses         0.17        (0.03)       (0.09)       (0.03)
      Coal contract
       settlement
       (2009 impact)             -            -        (0.08)           -
      Severe storms &
       accounting order          -            -        (0.04)        0.09
      Retroactive federal
       regulatory order          -            -            -         0.05
      Illinois electric
       rate relief
       settlement, net        0.03         0.18         0.10         0.13
    Core (non-GAAP)
     earnings per share      $1.17        $1.33        $2.50        $2.70

"As expected, our core earnings for both the third quarter and the first nine months of 2008 were down from the prior year periods," said Gary L. Rainwater, chairman, president and chief executive officer of Ameren Corporation. "Milder summer weather reduced our third quarter 2008 earnings by an estimated 18 cents per share as temperatures were less extreme than those experienced during last year's very hot summer. During the third quarter of 2008, cooling degree-days across the Ameren system were 27% lower than during the third quarter of 2007, leading to declines in weather-sensitive residential and commercial electricity sales of 16% and 8%, respectively. In addition, rising costs for fuel and expenditures to improve distribution system reliability reduced core earnings for the third quarter and the first nine months of 2008.

"Rising cost pressures, coupled with significant investments in our utility infrastructure, have required us to seek rate increases for both our Illinois and Missouri regulated operations. In September, the Illinois Commerce Commission authorized much needed rate increases for our electric and gas distribution businesses. The new rates became effective October 1, 2008. In Missouri, our pending electric rate case is moving forward, and we expect a decision from the Public Service Commission in late January or in February 2009 with new rates anticipated to be effective March 1, 2009. A constructive outcome in the Missouri case is critical to our ability to continue to invest in our infrastructure so that we will be able to meet our customers' expectations for safe and reliable service, as well as have access to the capital markets to finance our operations during this highly uncertain period in the financial markets," added Rainwater.

2008 Earnings Guidance

Ameren also announced today that it has narrowed its expectations for 2008 core (non-GAAP) earnings to be in the range of $2.80 to $3.00 per share, compared to the prior range of $2.80 to $3.20 per share, primarily because of lower-than-expected power prices in the second half of the year and mild summer weather.

Excluded from 2008 core (non-GAAP) earnings guidance is an estimated 12 cents per share negative impact of the Illinois comprehensive electric rate relief and customer assistance settlement agreement, the 8 cents per share benefit from a coal contract settlement related to expected 2009 costs, the 4 cents per share positive impact of a Missouri Public Service Commission accounting order associated with 2007 storm costs and net mark-to-market gains or losses from nonqualifying hedges.

Ameren also revised the range of contributions its business segments are expected to provide to 2008 core (non-GAAP) earnings per share. The revised expected contributions are as follows:


    Missouri Regulated                                $1.17  -  $1.25
    Illinois Regulated                                 0.20  -   0.25
    Non-rate-regulated Generation                      1.43  -   1.50
      2008 Core (Non-GAAP) Earnings Guidance Range    $2.80  -  $3.00

Further, Ameren adjusted its expectations for 2008 GAAP earnings to be in the range of $2.80 to $3.00 per share versus the prior range of $2.80 to $3.20 per share. The change corresponds to the revised core (non-GAAP) earnings guidance range. Any net unrealized mark-to-market gains or losses from nonqualifying hedges will impact GAAP earnings, but are excluded from GAAP and core (non-GAAP) earnings guidance because the company is unable to reasonably estimate the impact of any gains or losses due to the volatility of markets.

Ameren's guidance for 2008 assumes normal fourth quarter weather and is subject to, among other things, regulatory decisions and legislative actions, plant operations, energy and capital market conditions, economic conditions, severe storms, unusual or otherwise unexpected gains or losses, and other risks and uncertainties outlined, or referred to, in the Forward-looking Statements section of this press release.

Missouri Regulated Operations

Core (non-GAAP) earnings in the third quarter of 2008 were $141 million, compared to $178 million in the third quarter of 2007. The decline in core (non-GAAP) earnings was primarily due to much cooler summer weather in the third quarter of 2008 compared to the very hot weather in the year ago period, as well as due to higher fuel prices in the third quarter of 2008. GAAP earnings in the third quarter of 2008 were $98 million, or $80 million lower than in the third quarter of 2007. In addition to the items noted above, this decrease was primarily due to net unrealized mark-to-market losses from nonqualifying hedges of future fuel transportation costs. The value of the nonqualifying hedges will fluctuate over time based on then current market prices.

Illinois Regulated Operations

In the third quarter of 2008, Illinois regulated operations core (non- GAAP) earnings were $17 million compared to $8 million in the third quarter of 2007. The increase reflects the earnings benefit of $23 million from seasonally redesigned electric rates. Over the course of the full year, this rate redesign is not expected to have any net impact on earnings. Third quarter 2008 earnings were negatively impacted versus the year-ago period by much cooler summer weather, increased distribution system reliability spending and higher bad debt expenses, among other items. Illinois regulated operations recorded GAAP earnings in the third quarter of 2008 of $13 million, compared to a loss of $8 million in the third quarter of 2007. In addition to the items noted above, this difference was driven primarily by the cost of the Illinois comprehensive electric rate relief and customer assistance settlement agreement, which reduced earnings in the third quarter of 2008 and 2007.

Non-rate-regulated Generation Operations

Core (non-GAAP) earnings in the second quarter of 2008 were $98 million, or $8 million higher than in the third quarter of 2007. The increase in core (non-GAAP) earnings was primarily driven by higher realized electric margins due, in part, to improved plant operations. GAAP earnings in the third quarter of 2008 were $108 million, compared with $71 million in the third quarter of 2007. In addition to the item noted above, this change was driven by net unrealized mark-to-market gains primarily related to nonqualifying hedges of changes in electricity prices in the third quarter of 2008, and the cost of the Illinois comprehensive electric rate relief and customer assistance settlement agreement in the third quarter of 2007.

Commentary on Available Liquidity and Capital and Credit Markets

"The global financial markets have experienced extreme volatility and disruption in 2008, and, in particular, since early September. This disruption has led to major financial institutions coming under financial duress, significant strains in the credit markets, deteriorating economic conditions and steep declines in stock prices. The United States government and governments around the world have established programs to strengthen the global financial system. We are encouraged by these efforts and believe that, in time, these efforts will benefit the financial markets. However, in the interim, these events have impacted our company and we believe they will continue to impact us through 2009 and perhaps longer," said Rainwater.

"Our management team remains sharply focused on providing our customers with safe and reliable electric and gas service, as well as complying with federal and state environmental, reliability, and other regulations. We are balancing these operational objectives with the need to proactively manage our finances in these highly volatile and uncertain markets.

"At October 31, 2008, our available liquidity, which represents our cash on hand and amounts available under our credit facilities, stood at approximately $1.45 billion, up about $550 million from this same time last year. Despite this solid liquidity position, we are reducing 2009 operating and capital expenditures in our non-rate regulated generation business by a total of $400 million to $500 million. Operating and capital expenditures in 2009 for this business will be approximately $300 million to $400 million below 2008 levels. Other meaningful capital expenditure deferral and reduction opportunities are also under review throughout the rest of our business.

"Looking ahead, we will remain focused on prudently managing our operations and maintaining strong overall liquidity to meet our operating, capital and financing needs, as well as executing our long-term strategic plans to enhance shareholder value above current depressed levels, which I believe do not reflect the strong underlying value of our company," added Rainwater.

Analyst Conference Call

Ameren will conduct a conference call for financial analysts at 9:00 a.m. Central Time on Tuesday, Nov. 4, to discuss 2008 third quarter earnings and other matters. Investors, the news media and the public may listen to a live Internet broadcast of the call at www.ameren.com by clicking on "Q3 2008 Ameren Corporation Earnings Conference Call," then the appropriate audio link. An accompanying slide presentation will also be available on Ameren's Web site. This presentation will be posted in the "Investors" section of the Web site under "Presentations." The analyst call will also be available for replay on the Internet for one year. Telephone playback of the conference call will also be available beginning at approximately noon Central Time, from Nov. 4 through Nov. 11, by dialing, U.S. (800) 405-2236; international (303) 590-3000 and entering the number: 11121637#.

About Ameren

With assets of approximately $21 billion, Ameren serves approximately 2.4 million electric customers and almost one million natural gas customers in a 64,000 square mile area of Missouri and Illinois. Ameren owns a diverse mix of electric generating plants strategically located in its Midwest market with a generating capacity of more than 16,400 megawatts.

Regulation G Statement

Ameren has presented certain information in this release on a diluted cents per share basis. These diluted per share amounts reflect certain factors that directly impact Ameren's total earnings per share. The core (non-GAAP) earnings per share and core (non-GAAP) earnings per share guidance excludes one or more of the following: costs related to severe January 2007 storms, the earnings impact of the settlement agreement among parties in Illinois for comprehensive electric rate relief and customer assistance, the reversal of accruals made in 2006 for low-income energy assistance and energy efficiency program funding commitments in Illinois, a March 2007 Federal Energy Regulatory Commission order, which retroactively adjusted prior years' regional transmission organization costs, net mark-to-market gains or losses from nonqualifying hedges, the estimated minimum benefit of an accounting order from the Missouri Public Service Commission associated with 2007 storm costs and the 2008 lump-sum payment from a coal supplier for expected higher fuel costs in 2009 as a result of the premature closure of a mine and termination of a contract. Ameren uses core (non-GAAP) earnings internally for financial planning and for analysis of performance. Ameren also uses core (non-GAAP) earnings as primary performance measurements when communicating with analysts and investors regarding our earnings results and outlook, as the company believes it allows it to more accurately compare the company's ongoing performance across periods.

In providing consolidated and segment core (non-GAAP) earnings guidance, there could be differences between core (non-GAAP) earnings and earnings prepared in accordance with GAAP for certain items, such as those listed above. Ameren is unable to estimate the impact, if any, on future GAAP earnings of certain items, such as the ultimate earnings impact of the Missouri Public Service Commission storm cost-related order, or net mark-to- market gains or losses from nonqualifying hedges.

Forward-looking Statements

Statements in this release not based on historical facts are considered "forward-looking" and, accordingly, involve risks and uncertainties that could cause actual results to differ materially from those discussed. Although such forward-looking statements have been made in good faith and are based on reasonable assumptions, there is no assurance that the expected results will be achieved. These statements include (without limitation) statements as to future expectations, beliefs, plans, strategies, objectives, events, conditions, and financial performance. In connection with the "safe harbor" provisions of the Private Securities Litigation Reform Act of 1995, we are providing this cautionary statement to identify important factors that could cause actual results to differ materially from those anticipated. The following factors, in addition to those discussed elsewhere in this release and in our filings with the Securities and Exchange Commission, could cause actual results to differ materially from management expectations suggested in such forward-looking statements:

    --  regulatory or legislative actions, including changes in regulatory
        policies and ratemaking determinations, such as the outcome of the
        pending Union Electric Company rate proceeding or future legislative
        actions that seek to limit or reverse rate increases;
    --  uncertainty as to the effect of implementation of the Illinois
        comprehensive electric rate relief and customer assistance settlement
        agreement on Ameren, Central Illinois Public Service Company, Central
        Illinois Light Company and Illinois Power Company (the Ameren Illinois
        Utilities), Ameren Energy Generating Company and AmerenEnergy
        Resources Generating Company, including implementation of a new power
        procurement process;
    --  changes in laws and other governmental actions, including monetary and
        fiscal policies;
    --  changes in laws or regulations that adversely affect the ability of
        electric distribution companies and other purchasers of wholesale
        electricity to pay their suppliers, including Union Electric Company
        and Ameren Energy Marketing Company;
    --  enactment of legislation taxing electric generators, in Illinois or
        elsewhere;
    --  the effects of increased competition in the future due to, among other
        things, deregulation of certain aspects of our business at both the
        state and federal levels, and the implementation of deregulation, such
        as occurred when the electric rate freeze and power supply contracts
        expired in Illinois at the end of 2006;
    --  the effects of participation in the Midwest Independent Transmission
        System Operator, Inc.;
    --  the cost and availability of fuel such as coal, natural gas, and
        enriched uranium used to produce electricity; the cost and
        availability of purchased power and natural gas for distribution; and
        the level and volatility of future market prices for such commodities,
        including the ability to recover the costs for such commodities;
    --  the effectiveness of our risk management strategies and the use of
        financial and derivative instruments;
    --  prices for power in the Midwest, including forward prices;
    --  business and economic conditions, including their impact on interest
        rates, bad debt expense, and demand for our products;
    --  disruptions of the capital markets or other events that make the
        Ameren Companies' access to necessary capital, including short-term
        credit, more difficult or costly;
    --  our assessment of our liquidity;
    --  the impact of the adoption of new accounting standards and the
        application of appropriate technical accounting rules and guidance;
    --  actions of credit rating agencies and the effects of such actions;
    --  weather conditions and other natural phenomena;
    --  the impact of system outages caused by severe weather conditions or
        other events;
    --  generation plant construction, installation and performance, including
        costs associated with Union Electric Company's Taum Sauk pumped-
        storage hydroelectric plant incident and the plant's future operation;
    --  recoverability through insurance of costs associated with Union
        Electric Company's Taum Sauk pumped-storage hydroelectric plant
        incident;
    --  operation of Union Electric Company's nuclear power facility,
        including planned and unplanned outages, and decommissioning costs;
    --  the effects of strategic initiatives, including acquisitions and
        divestitures;
    --  the impact of current environmental regulations on utilities and power
        generating companies and the expectation that more stringent
        requirements, including those related to greenhouse gases, will be
        introduced over time, which could have a negative financial effect;
    --  labor disputes, future wage and employee benefits costs, including
        changes in discount rates and returns on benefit plan assets;
    --  the inability of our counterparties and affiliates to meet their
        obligations with respect to contracts and financial instruments;
    --  the cost and availability of transmission capacity for the energy
        generated by the Ameren companies' facilities or required to satisfy
        energy sales made by the Ameren companies;
    --  legal and administrative proceedings; and
    --  acts of sabotage, war, terrorism or intentionally disruptive acts.

Given these uncertainties, undue reliance should not be placed on these forward-looking statements. Except to the extent required by the federal securities laws, we undertake no obligation to update or revise publicly any forward-looking statements to reflect new information or future events.



                            AMEREN CORPORATION (AEE)
                           CONSOLIDATED BALANCE SHEET
                            (Unaudited, in millions)

                                               September 30,      December 31,
                                                      2008              2007
                            ASSETS
    Current Assets:
      Cash and cash equivalents                       $206              $355
      Accounts receivable - trade, net                 506               570
      Unbilled revenue                                 262               359
      Miscellaneous accounts and notes receivable      291               280
      Materials and supplies                           956               735
      Other current assets                             326               181
         Total current assets                        2,547             2,480
    Property and Plant, Net                         15,977            15,069
    Investments and Other Assets:
      Nuclear decommissioning trust fund               269               307
      Goodwill                                         831               831
      Intangible assets                                167               198
      Regulatory assets                              1,122             1,158
      Other assets                                     566               685
         Total investments and other assets          2,955             3,179

    TOTAL ASSETS                                   $21,479           $20,728

              LIABILITIES AND STOCKHOLDERS' EQUITY

    Current Liabilities:
      Current maturities of long-term debt            $269              $221
      Short-term debt                                1,407             1,472
      Accounts and wages payable                       509               687
      Taxes accrued                                    128                84
      Other current liabilities                        605               438
        Total current liabilities                    2,918             2,902
    Long-term Debt, Net                              6,143             5,691
    Preferred Stock of Subsidiary Subject
     to Mandatory Redemption                             -                16
    Deferred Credits and Other Liabilities:
      Accumulated deferred income taxes, net         2,072             2,046
      Accumulated deferred investment tax credits      102               109
      Regulatory liabilities                         1,291             1,240
      Asset retirement obligations                     583               562
      Accrued pension and other postretirement
       benefits                                        741               839
      Other deferred credits and liabilities           367               354
        Total deferred credits and other
         liabilities                                 5,156             5,150
    Preferred Stock of Subsidiaries Not
     Subject to Mandatory Redemption                   195               195
    Minority Interest in Consolidated Subsidiaries      24                22
    Stockholders' Equity:
      Common stock                                       2                 2
      Other paid-in capital, principally
       premium on common stock                       4,731             4,604
      Retained earnings                              2,259             2,110
      Accumulated other comprehensive income (loss)     51                36
        Total stockholders' equity                   7,043             6,752

    TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY     $21,479           $20,728



                            AMEREN CORPORATION (AEE)
                        CONSOLIDATED STATEMENT OF INCOME
               (Unaudited, in millions, except per share amounts)

                                        Three Months Ended  Nine Months Ended
                                           September 30,       September 30,
                                           2008      2007     2008      2007

    Operating Revenues:
      Electric                             $1,928   $1,872   $4,944   $4,855
      Gas                                     132      125      987      895
        Total operating revenues            2,060    1,997    5,931    5,750

    Operating Expenses:
      Fuel                                    461      338      963      864
      Coal contract settlement                  -        -      (60)       -
      Purchased power                         371      419      964    1,106
      Gas purchased for resale                 73       68      697      622
      Other operations and maintenance        449      417    1,340    1,230
      Depreciation and amortization           180      176      534      534
      Taxes other than income taxes            98       97      300      295
        Total operating expenses            1,632    1,515    4,738    4,651
    Operating Income                          428      482    1,193    1,099

    Other Income and Expenses:
      Miscellaneous income                     23       20       61       53
      Miscellaneous expense                   (10)      (9)     (23)     (19)
        Total other income                     13       11       38       34

    Interest Charges                          113      110      331      316

    Income Before Income Taxes, Minority
     Interest and Preferred
     Dividends of Subsidiaries                328      383      900      817

    Income Taxes                              113      130      319      279

    Income Before Minority Interest and
     Preferred Dividends of Subsidiaries      215      253      581      538

    Minority Interest and Preferred
     Dividends of Subsidiaries                 11        9       33       28

    Net Income                               $204     $244     $548     $510

    Earnings per Common Share - Basic and
     Diluted                                $0.97    $1.18    $2.61    $2.46


    Average Common Shares Outstanding       210.3    207.6    209.5    207.1



                            AMEREN CORPORATION (AEE)
                      CONSOLIDATED STATEMENT OF CASH FLOWS
                            (Unaudited, in millions)

                                                         Nine Months Ended
                                                           September 30,
                                                      2008              2007
    Cash Flows From Operating Activities:
      Net income                                      $548              $510
      Adjustments to reconcile net income
       to net cash provided by operating
       activities:
        Gain on sales of emission allowances            (2)               (7)
        Net mark-to-market gain on derivatives         (42)               (7)
        Depreciation and amortization                  549               557
        Amortization of nuclear fuel                    31                26
        Amortization of debt issuance costs
         and premium/discounts                          14                14
        Deferred income taxes and investment
         tax credits, net                              130                18
        Minority interest                               25                20
        Other                                           (2)               10
        Changes in assets and liabilities:
          Receivables                                  144              (220)
          Materials and supplies                      (216)             (110)
          Accounts and wages payable                  (100)             (113)
          Taxes accrued, net                            44                75
          Assets, other                                 46                58
          Liabilities, other                           142               151
          Pension and other postretirement
           benefit obligations                           2                67
          Counterparty collateral asset                 (2)              (71)
          Counterparty collateral liability              2                 -
          Taum Sauk insurance receivable, net          (68)              (58)
    Net cash provided by operating activities        1,245               920

    Cash Flows From Investing Activities:
      Capital expenditures                          (1,316)           (1,035)
      Nuclear fuel expenditures                       (161)              (39)
      Purchases of securities - nuclear
       decommissioning trust fund                     (386)             (110)
      Sales of securities - nuclear
       decommissioning trust fund                      360                98
      Purchases of emission allowances                  (2)              (12)
      Sales of emission allowances                       2                 5
      Other                                              2                 -
    Net cash used in investing activities           (1,501)           (1,093)

    Cash Flows From Financing Activities:
      Dividends on common stock                       (399)             (395)
      Capital issuance costs                            (9)               (3)
      Short-term debt, net                             (65)              590
      Dividends paid to minority interest holder       (23)              (16)
      Redemptions, repurchases, and maturities:
        Long-term debt                                (823)             (465)
        Preferred stock                                (16)               (1)
      Issuances:
        Common stock                                   107                71
        Long-term debt                               1,335               425
    Net cash provided by financing activities          107               206

    Net change in cash and cash equivalents           (149)               33
    Cash and cash equivalents at beginning of year     355               137

    Cash and cash equivalents at end of period        $206              $170



                            AMEREN CORPORATION (AEE)
                        CONSOLIDATED OPERATING STATISTICS

                                        Three Months Ended  Nine Months Ended
                                           September 30,      September 30,
                                            2008     2007     2008     2007

    Electric Sales - kilowatt-hour (in
     millions):
    Missouri Regulated
       Residential                          3,708    4,409   10,567   11,123
       Commercial                           4,020    4,407   11,205   11,280
       Industrial                           2,502    2,617    6,990    7,244
       Other                                  210      219      606      577
         Native                            10,440   11,652   29,368   30,224
       Non-affiliate interchange sales      2,490    2,219    8,531    7,186
         Subtotal                          12,930   13,871   37,899   37,410

    Illinois Regulated
       Residential
         Generation and delivery service    3,063    3,624    8,718    9,137
       Commercial
         Generation and delivery service    1,527    1,839    4,486    5,652
         Delivery service only              1,704    1,609    4,555    3,924
       Industrial
         Generation and delivery service      352      147    1,091    1,383
         Delivery service only              2,960    3,317    8,567    8,752
       Other                                  132      140      406      431
         Subtotal                           9,738   10,676   27,823   29,279

    Non-rate-regulated Generation
       Non-affiliate energy sales           7,245    6,710   19,560   18,439
       Affiliate energy sales               1,441    2,086    4,639    5,663
         Subtotal                           8,686    8,796   24,199   24,102

    Eliminate affiliate sales              (1,441)  (2,086)  (4,639)  (5,663)
    Eliminate Illinois Regulated/Non-
     rate-regulated Generation common
     customers                             (1,278)  (1,444)  (3,656)  (4,488)

       Ameren Total                        28,635   29,813   81,626   80,640

    Electric Revenues (in millions):
    Missouri Regulated
       Residential                           $311     $366     $756     $801
       Commercial                             278      302      673      674
       Industrial                             125      129      295      308
       Other                                   28       37       97       81
         Native                               742      834    1,821    1,864
       Non-affiliate interchange sales        111       92      409      303
         Subtotal                             853      926    2,230    2,167

    Illinois Regulated
       Residential
         Generation and delivery service      312      217      825      808
       Commercial
         Generation and delivery service      177      171      462      532
         Delivery service only                 22       18       56       37
       Industrial
         Generation and delivery service       28       23       77       98
         Delivery service only                  8        7       22       17
       Other                                   73      187      230      285
         Subtotal                             620      623    1,672    1,777

    Non-rate-regulated Generation
       Non-affiliate energy sales             460      364    1,057      971
       Affiliate native energy sales           99      111      309      351
       Other                                   36       26       84       44
         Subtotal                             595      501    1,450    1,366

    Eliminate affiliate and common
     customer sales                          (140)    (178)    (408)    (455)
       Ameren Total                        $1,928   $1,872   $4,944   $4,855



                            AMEREN CORPORATION (AEE)
                       CONSOLIDATED OPERATING STATISTICS

                                            Three Months       Nine Months
                                               Ended              Ended
                                            September 30,     September 30,
                                            2008    2007      2008     2007
    Electric Generation - megawatt-hour
     (in millions):
    Missouri Regulated                      13.0     13.6     38.1     37.4
    Non-rate-regulated Generation
       Ameren Energy Generating Company
        (Genco)                              4.3      4.7     12.2     12.8
       AmerenEnergy Resources Generating
        Company (AERG)                       1.8      1.3      5.1      3.9
       Electric Energy, Inc. (EEI)           2.1      2.0      5.9      5.9
       AmerenEnergy Medina Valley Cogen
        L.L.C.                               0.1      0.1      0.2      0.2
         Subtotal                            8.3      8.1     23.4     22.8
         Ameren Total                       21.3     21.7     61.5     60.2

    Fuel Cost per kilowatt-hour (cents)
       Missouri Regulated                  1.378    1.372    1.297    1.245
       Non-rate-regulated Generation       1.982    1.810    1.913    1.711

    Gas Sales - decatherms (in thousands)
       Missouri Regulated                    750      862    8,522    7,986
       Illinois Regulated                  4,662    6,331   69,122   64,857
       Other                                 196      162    1,122    1,598
         Ameren Total                      5,608    7,355   78,766   74,441

    Net Income (Loss) by Segment (in
     millions):
       Missouri Regulated                    $98     $178     $272     $263
       Illinois Regulated                     13       (8)      15       45
       Non-rate-regulated Generation         108       71      284      197
       Other                                 (15)       3      (23)       5
         Ameren Total                       $204     $244     $548     $510


                                               September 30,      December 31,
                                                    2008              2007
    Common Stock:
       Shares outstanding (in millions)             210.9             208.3
       Book value per share                        $33.40            $32.41

    Capitalization Ratios:
       Common equity                                47.4%             48.3%
       Preferred stock                               1.3%              1.4%
       Debt, net of cash                            51.3%             50.3%

/CONTACT: Media, Susan Gallagher, +1-314-554-2175, sgallagher@ameren.com, or Analysts, Doug Fischer, +1-314-554-4859, dfischer@ameren.com, or Investors, Investor Services, 1-800-255-2237, invest@ameren.com, all of Ameren Corporation/