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


                                    FORM 10-Q

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

         For Quarterly Period Ended June 30, 1998

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

         For The Transition Period From                    to

                         Commission file number 1-14756.

                               AMEREN CORPORATION
             (Exact name of registrant as specified in its charter)

         Missouri                                                43-1723446
(State or other jurisdiction of                               (I.R.S. Employer
incorporation or organization)                               Identification No.)


                 1901 Chouteau Avenue, St. Louis, Missouri 63103
              (Address of principal executive offices and Zip Code)


                         Registrant's telephone number,
                       including area code: (314) 621-3222


           Indicate  by check  mark  whether  the  registrant  (1) has 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 reports), and (2) has been subject to such filing
                       requirements for the past 90 days.


                           Yes    X   .    No       .


Shares  outstanding of each of  registrant's  classes of common stock as of July
31, 1998:
    Common Stock, $ .01 par value - 137,215,462







                               Ameren Corporation

                                      Index

                                                                    Page No.

Part I    Consolidated Financial Information (Unaudited)

          Management's Discussion and Analysis                         2

          Consolidated Balance Sheet
          - June 30, 1998 and December 31, 1997                        7

          Consolidated Statement of Income
          - Three months, six months and 12 months ended
          June 30, 1998 and 1997                                       8

          Consolidated Statement of Cash Flows
          - Six months ended June 30, 1998 and 1997                    9

          Notes to Consolidated Financial Statements                   10



 Part II  Other Information




             PART I. CONSOLIDATED FINANCIAL INFORMATION (UNAUDITED)

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

OVERVIEW

     Ameren  Corporation  (Ameren) is a newly created  holding  company which is
registered  under the Public  Utility  Holding  Company Act of 1935 (PUHCA).  In
December  1997,  Union  Electric  Company  (AmerenUE)  and  CIPSCO  Incorporated
(CIPSCO)  combined to form Ameren,  with  AmerenUE  and  CIPSCO's  subsidiaries,
Central  Illinois  Public Service  Company  (AmerenCIPS)  and CIPSCO  Investment
Company (CIC) becoming  wholly-owned  subsidiaries of Ameren (the Merger).  As a
result of the Merger,  Ameren has a 60% ownership  interest in Electric  Energy,
Inc. (EEI), which is consolidated for financial reporting purposes. In addition,
Ameren formed a new energy marketing subsidiary, Ameren Energy, Inc., which will
focus on power and gas  marketing  transactions,  serving  as a power  marketing
agent for the  operating  companies  and  providing  a range of energy  and risk
management services to targeted customers.

     The Merger  was  accounted  for as a  pooling-of-interests;  therefore  the
consolidated   financial   statements  are  presented  as  if  the  Merger  were
consummated as of the beginning of the earliest period presented.  However,  the
consolidated  financial statements are not necessarily indicative of the results
of operations, financial position or cash flows that would have occurred had the
Merger been consummated for the periods for which it is given effect,  nor is it
necessarily  indicative of the future results of operations,  financial position
or cash flows.

     The following  discussion and analysis  should be read in conjunction  with
the Notes to  Consolidated  Financial  Statements  beginning on page 10, and the
Management's  Discussion  and  Analysis of  Financial  Condition  and Results of
Operations (MD&A), the Audited  Consolidated  Financial Statements and the Notes
to Consolidated  Financial  Statements appearing in the Registrant's 1997 Annual
Report to stockholders.

     References  to  the  Registrant  are to  Ameren  on a  consolidated  basis;
however, in certain  circumstances,  the subsidiaries are separately referred to
in order to distinguish between their different business activities.

RESULTS OF OPERATIONS

Earnings
     Second  quarter  1998  earnings  of $84  million,  or 61 cents  per  share,
increased $4 million, or 3 cents per share, from 1997's second quarter earnings.
Earnings  for the six months ended June 30, 1998,  totaled $124  million,  or 90
cents per share,  compared to year-ago earnings of $125 million, or 91 cents per
share.  Earnings for the 12 months ended June 30, 1998,  were $334  million,  or
$2.43 per share, compared to $366 million, or $2.67 per share, for the preceding
12-month  period.  Excluding  the  extraordinary  charge  recorded in the fourth
quarter  of 1997 to  write  off the  generation-related  regulatory  assets  and
liabilities of the Registrant's Illinois retail electric business,  earnings for
the 12-month period ended June 30, 1998, were $385 million, or $2.81 per share.

     Earnings and  earnings per share  fluctuated  due to many  conditions,  the
primary ones being:  weather variations,  credits to electric  customers,  sales
growth, fluctuating operating costs, the write-off of certain generation-related
regulatory  assets and liabilities,  and  merger-related  costs. The significant
items affecting revenues,  costs and earnings during the three-month,  six-month
and 12-month periods ended June 30, 1998, and 1997 are detailed below.

                                       2




Electric Operations



Electric Operating Revenues       Variations for periods ended June 30, 1998
                                      from comparable prior-year periods
- ---------------------------- ---------------- ---------------- -----------------
(Millions of Dollars)          Three Months      Six Months       Twelve Months
- ---------------------------- ---------------- ---------------- -----------------
                                                            
Credit to customers               $(25)            $(24)              $(22)
Effect of abnormal weather          44               29                 59
Growth and other                    32               54                 87
Interchange sales                   (3)             (36)               (90)
EEI                                (19)             (37)               (34)
- ---------------------------- ---------------- ---------------- -----------------
                                  $ 29             $(14)               $ -
- ---------------------------- ---------------- ---------------- -----------------



     The $29 million  increase in second quarter electric  revenues  compared to
the year-ago  quarter was primarily driven by increased native sales due to warm
weather, a strong regional economy and benefits realized from the elimination of
the retail electric fuel adjustment clause in the operating  companies' Illinois
jurisdiction  effective  in  the  second  quarter  of  1998.   Weather-sensitive
residential   and  commercial   sales   increased  19  percent  and  8  percent,
respectively,  while  industrial  sales  rose 3  percent,  reflecting  a  strong
regional  economy.  These increases were partially  offset by a higher credit to
Missouri  electric  customers (see Note 5 under Notes to Consolidated  Financial
Statements for further  information),  and lower sales by EEI,  primarily to the
Department of Energy.

     Electric  revenues  for the first six months of 1998  declined  $14 million
compared to the prior-year  period  primarily due to a higher credit to Missouri
electric customers (see Note 5 under Notes to Consolidated  Financial Statements
for further  information),  decreased  interchange  sales and lower sales to the
Department  of  Energy  by EEI.  Partially  offsetting  these  decreases  was an
increase  in  native  sales of 5 percent  due to warm  weather  compared  to the
year-ago  period  and  benefits  realized  from the  elimination  of the  retail
electric  fuel   adjustment   clause  in  the  operating   companies'   Illinois
jurisdiction  effective  in  the  second  quarter  of  1998.   Weather-sensitive
residential  and  commercial  sales grew 7 percent and 4 percent,  respectively,
while industrial sales rose 3 percent.

     Electric revenues for the 12 months ended June 30, 1998, remained flat with
the prior 12-month  period  resulting from a 4 percent  increase in native sales
due to favorable  weather and a strong local  economy,  offset by an increase in
credits to Missouri  electric  customers (see Note 5 under Notes to Consolidated
Financial  Statements for further  information) and fewer  interchange sales and
sales to the Department of Energy by EEI.




Fuel and Purchased Power          Variations for periods ended June 30, 1998
                                      from comparable prior-year periods
- ---------------------------- ---------------- ---------------- -----------------
(Millions of Dollars)          Three Months      Six Months       Twelve Months
- ---------------------------- ---------------- ---------------- -----------------
                                                           
Fuel:
    Variation in generation       $(5)            $(21)               $(20)
     Price                          8                9                  (3)
     Generation efficiencies
      and other                    (3)               2                   2
Purchased power variation          17                7                   4
EEI variation                     (10)             (27)                (29)
- ---------------------------- ----------------- --------------- -----------------
                                  $ 7             $(30)               $(46)
- ---------------------------- ----------------- --------------- -----------------




     Fuel and  purchased  power  costs for the second  quarter  1998  versus the
comparable  prior-year  quarter  increased $7 million primarily due to increased
power  purchases and higher energy  prices,  partially  offset by lower fuel and
purchased  power  at EEI due to  reduced  kilowatthour  sales.  The $30  million
decrease in fuel and  purchased  power for the six months  ended June 30,  1998,
compared to the year-ago period was primarily due to lower generation  resulting
from the scheduled  Callaway Nuclear Plant refueling  outage,  lower interchange
sales and a reduction at EEI due to fewer sales to the Department of Energy. The
$46 million  decrease in fuel and purchased  power costs for the 12 months ended
June 30, 1998,  versus  the  prior-year  period  was  driven  mainly by  reduced
generation

                                       3


primarily due to fewer interchange sales and  lower fuel and  purchased power at
EEI as a result of fewer sales to the Department of Energy.

     While unprecedented  prices for power purchases occurred in the marketplace
during the last week of June 1998, the Registrant was able to effectively manage
its power costs in the face of soaring wholesale  electricity  prices.  Overall,
the abnormally  high prices for power purchases in June had little impact on the
Registrant's financial results for the periods presented.

     Gas  Operations  Gas  revenues  for the six  months  ended  June 30,  1998,
decreased  $12  million  compared  to the  year-ago  period  primarily  due to a
decrease  in sales  volume due to milder  winter  weather,  as well as lower gas
costs reflected in the purchased gas adjustment clause,  partially offset by the
annual  $11.5  million  rate  increase  in  AmerenUE's  Missouri   jurisdiction,
effective  February  1998.  Gas revenues for the 12-month  period ended June 30,
1998,  decreased $17 million  compared to the same year-ago period primarily due
to a  decline  in  dekatherm  sales to  ultimate  customers  and lower gas costs
reflected in the purchased gas adjustment clause.

     Gas costs for the six and 12  months  ended  June 30,  1998,  declined  $17
million and $21 million,  respectively,  compared to the year-ago  periods.  The
decreases in gas costs for these periods were due to lower  dekatherm  sales and
lower gas prices.

Other Operating Expenses
     Other operating  expense  variations  reflected  recurring  factors such as
growth, inflation, labor and benefit increases.

     Other  operations  expenses  increased  $13 million and $20 million for the
three and six months  ended June 30,  1998,  respectively,  compared to the same
year-ago  periods  primarily  due to  increased  injuries  and damages  expense,
information system-related expenses and labor costs. The $44 million increase in
other operations expenses for the 12 months ended June 30, 1998, compared to the
prior 12-month period was primarily due to increased information  system-related
expenses, labor costs and injuries and damages expense.

     Maintenance  expenses  for the three and six months  ended  June 30,  1998,
increased  $8 million and $6  million,  respectively,  compared to the  year-ago
periods  primarily due to the costs of refueling of the Callaway  Nuclear Plant,
partially  offset by a reduction in  scheduled  fossil  plant  maintenance.  The
spring  1998  scheduled  refueling  was  completed  in 31 days.  The $12 million
increase in  maintenance  expenses for the 12-month  period ended June 30, 1998,
compared to the prior  12-month  period was due to  increased  scheduled  fossil
plant maintenance.

     In March 1998, the Registrant announced plans to reduce its other operating
expenses,  including plans to eliminate  approximately 400 employee positions by
mid-1999 through a hiring freeze and a targeted  voluntary  separation plan (the
Plan).  In July 1998, the Registrant  offered  separation  packages to employees
whose  positions are to be eliminated  through the Plan. The Registrant  expects
that the Plan will result in a charge to  earnings in the third  quarter of 1998
once the number of employees that will accept the terms of the Plan is known. At
this time, the Registrant is unable to estimate the expected  charge to earnings
resulting from the Plan.

Taxes
     The $12 million decrease in income taxes charged to operating  expenses for
the 12 months ended June 30, 1998,  compared to the year-ago period is primarily
due to lower operating income and a lower effective tax rate.

     Other Income and Deductions Miscellaneous, net for the three months and six
months ended June 30, 1998,  increased $3 million and $4 million,  respectively,
versus the  comparable  1997 periods,  primarily  due to reduced  merger-related
costs.  Miscellaneous,  net increased $15 million for the 12-month  period ended
June 30, 1998,  compared to the year-ago period primarily due to the reversal of
the Missouri portion of merger-related costs which were recorded as a regulatory
asset  upon  Merger  close  under  conditions  of the  Missouri  Public  Service
Commission order approving the Merger.

                                       4


Balance Sheet
     The $70 million increase in trade accounts receivable and unbilled revenues
was due  primarily to higher  revenues in May and June 1998 compared to November
and December 1997.

     Changes in accounts and wages payable,  taxes  accrued,  other accruals and
other  current  assets  resulted  from the timing of various  payments to taxing
authorities and suppliers.


LIQUIDITY AND CAPITAL RESOURCES

     Cash  provided by  operating  activities  totaled  $246 million for the six
months  ended  June 30,  1998,  compared  to $219  million  during the same 1997
period.

     Cash flows used in  investing  activities  totaled  $130  million  and $209
million  for  the six  months  ended  June  30,  1998  and  1997,  respectively.
Construction   expenditures  for  the  six  months  ended  June  30,  1998,  for
constructing new or improving  existing  facilities and complying with the Clean
Air Act were $139 million.  In addition,  the Registrant expended $9 million for
the acquisition of nuclear fuel. Capital  requirements for the remainder of 1998
are expected to be principally for construction expenditures and the acquisition
of nuclear fuel.

     Cash flows used in financing activities were $78 million for the six months
ended June 30, 1998, compared to cash flows provided by financing  activities of
$16 million during the same 1997 period.  The Registrant's  principal  financing
activities for the six months ended June 30, 1998, included the issuance of $159
million of long-term  debt,  the redemption of $10 million of long-term debt and
the payment of dividends. On April 28, 1998, the Registrant's Board of Directors
declared a quarterly  dividend of 63.5 cents per common  share which was paid to
shareholders  on June 30, 1998.  Common stock  dividends  paid for the 12 months
ended  June  30,  1998,  resulted  in a pay  out  rate  of  101  percent  of the
Registrant's   earnings  to  common   stockholders  (88  percent  excluding  the
extraordinary  charge).  Dividends paid to the Registrant's  common shareholders
relative to net cash provided by operating  activities  for the same period were
47 percent.

     The  Registrant  plans to  continue  utilizing  short-term  debt to support
normal  operations  and other  temporary  requirements.  The  Registrant and its
subsidiaries  are  authorized by the Securities  and Exchange  Commission  under
PUHCA to have up to an  aggregate  $1.7  billion of  short-term  unsecured  debt
instruments  outstanding at any one time.  Short-term borrowings consist of bank
loans  (maturities  generally  on  an  overnight  basis)  and  commercial  paper
(maturities  generally  within 10 to 45 days).  At June 30, 1998, the Registrant
had committed  bank lines of credit  aggregating  $234 million (all of which was
unused and $179 million was available at such date) which make available interim
financing at various rates of interest based on LIBOR,  the bank  certificate of
deposit rate or other  options.  The lines of credit are  renewable  annually at
various  dates  throughout  the  year.  The  Registrant  also has a bank  credit
agreement  due 2003  which  permits  the  borrowing  of up to $200  million on a
short-term  basis.  This credit  agreement is available for the Registrant's own
use and for the use of its subsidiaries. There was $20 million outstanding under
this  agreement as of June 30, 1998. At June 30, 1998,  the  Registrant  had $78
million of short-term borrowings.

     Additionally,  AmerenUE has a bank credit  agreement due 2000 which permits
the  borrowing  of up to $300  million on a  long-term  basis,  all of which was
unused and $116 million was available at June 30, 1998.

     AmerenUE  also has a lease  agreement  which  provides for the financing of
nuclear fuel. At June 30, 1998,  the maximum amount that could be financed under
the agreement was $120 million.  Cash used in financing for the six months ended
June 30,  1998,  included  redemptions  under the lease for nuclear  fuel of $51
million offset in part by $8 million of issuances. At June 30, 1998, $75 million
was financed under the lease.

                                       5


RATE MATTERS

     As a result of the Electric  Service Customer Choice and Rate Relief Law of
1997 (the  Law)  providing  for  electric  utility  restructuring  in  Illinois,
AmerenUE and AmerenCIPS  filed proposals with the Illinois  Commerce  Commission
(ICC) to  eliminate  the electric  fuel  adjustment  clause for Illinois  retail
customers, thereby including a historical level of fuel costs in base rates. The
ICC approved  AmerenCIPS' and AmerenUE's filings on March 25, 1998 and April 28,
1998, respectively.

     In June 1998,  AmerenUE and  AmerenCIPS  filed  residential  rate reduction
tariffs  with  the  ICC to  comply  with  the  requirements  of the  Law.  Under
provisions  of the Law, a rate  decrease of 5 percent will become  effective for
Illinois residential electric customers beginning August 1, 1998.

     Also in June 1998,  AmerenUE and AmerenCIPS  filed requests with the ICC to
increase  rates for natural gas  service  $17 million  annually in the  Illinois
jurisdiction. The ICC has until May 1999 to render a decision.

     See Note 5 under Notes to  Consolidated  Financial  Statements  for further
discussion of Rate Matters.

ACCOUNTING MATTERS

     In June 1998, the Financial  Accounting Standards Board issued Statement of
Financial  Accounting  Standards  (SFAS) No.  133,  "Accounting  for  Derivative
Instruments  and  Hedging  Activities."  SFAS  133  establishes  accounting  and
reporting  standards for derivative  instruments and for hedging  activities and
requires  recognition  of all  derivatives in the balance sheet measured at fair
value.  SFAS 133 is  effective  for all  fiscal  quarters  of all  fiscal  years
beginning after June 15, 1999. Earlier application is encouraged,  but permitted
only as of the beginning of any fiscal quarter that begins after issuance of the
standard. At this time, the Registrant is unable to determine the impact of SFAS
133 on its financial position or results of operations upon adoption.

     In February 1998, the Financial Accounting Standards Board issued SFAS 132,
"Employers' Disclosures about Pensions and Other Postretirement  Benefits." SFAS
132  revises  employers'  disclosures  about  pension  and other  postretirement
benefit plans.  SFAS 132 is effective for fiscal years  beginning after December
15, 1998, although earlier  application is encouraged.  SFAS 132 is not expected
to have a material impact on the Registrant's  financial  position or results of
operations upon adoption.

     In March 1998, the Accounting Standards Executive Committee of the American
Institute of Certified  Public  Accountants  issued  Statement of Position (SOP)
98-1,  "Accounting for the Costs of Computer Software  Developed or Obtained for
Internal  Use."  SOP 98-1  provides  guidance  on  accounting  for the  costs of
computer  software  developed  or obtained  for  internal  use.  Under SOP 98-1,
certain costs which are currently  expensed by the Registrant may be capitalized
and amortized  over some future  period.  SOP 98-1 is effective for fiscal years
beginning after December 15, 1998,  although earlier  application is encouraged.
At this time,  the  Registrant  is unable to determine the impact of SOP 98-1 on
its financial position or results of operations upon adoption.


SAFE HARBOR STATEMENT

     Statements made in this Form 10-Q which are not based on historical  facts,
are 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, the Registrant is providing
this cautionary  statement to identify important factors that could cause actual
results to differ materially from those  anticipated.  Factors include,  but are
not  limited to, the effects of  regulatory  actions;  changes in laws and other
governmental actions; competition; future market prices for electricity; average
rates for electricity in the Midwest; business and economic conditions;  weather
conditions; fuel prices and availability; generation plant performance; monetary
and fiscal policies; and legal and administrative proceedings.

                                       6


                               AMEREN CORPORATION
                               ------------------
                           CONSOLIDATED BALANCE SHEET
                           --------------------------
                                    UNAUDITED
                                    ---------
                      (Thousands of Dollars, Except Shares)




                                                                     June 30,   December 31,
ASSETS                                                                 1998         1997
- ------                                                             -----------   -----------
                                                                           
Property and plant, at original cost:
   Electric                                                        $11,634,439   $11,522,730
   Gas                                                                 457,629       447,458
   Other                                                                81,594        36,023
                                                                   -----------   -----------
                                                                    12,173,662    12,006,211
   Less accumulated depreciation and amortization                    5,440,491     5,285,434
                                                                   -----------   -----------
                                                                     6,733,171     6,720,777
Construction work in progress:
   Nuclear fuel in process                                              97,088       134,804
   Other                                                               119,533       131,504
                                                                   -----------   -----------
         Total property and plant, net                               6,949,792     6,987,085
                                                                   -----------   -----------
Investments and other assets:
   Investments                                                          85,368        97,188
   Nuclear decommissioning trust fund                                  148,699       122,438
   Other                                                                67,927        64,915
                                                                   -----------   -----------
         Total investments and other assets                            301,994       284,541
                                                                   -----------   -----------
Current assets:
   Cash and cash equivalents                                            47,084         9,696
   Accounts receivable - trade (less allowance for doubtful
         accounts of $6,437 and $4,845, respectively)                  299,262       266,306
   Unbilled revenue                                                    139,942       102,864
   Other accounts and notes receivable                                  49,962        49,765
   Materials and supplies, at average cost -
      Fossil fuel                                                       97,939        93,431
      Other                                                            135,869       134,152
   Other                                                                28,832        55,002
                                                                   -----------   -----------
         Total current assets                                          798,890       711,216
                                                                   -----------   -----------
Regulatory assets:
   Deferred income taxes                                               636,850       639,792
   Other                                                               192,857       204,913
                                                                   -----------   -----------
         Total regulatory assets                                       829,707       844,705
                                                                   -----------   -----------
Total Assets                                                       $ 8,880,383   $ 8,827,547
                                                                   ===========   ===========

CAPITAL AND LIABILITIES
Capitalization:
   Common stock, $.01 par value, authorized 400,000,000 shares -
   outstanding 137,215,462 shares                                  $     1,372   $     1,372
   Other paid-in capital, principally premium on
     common stock                                                    1,582,746     1,582,938
   Retained earnings                                                 1,383,739     1,434,658
                                                                   -----------   -----------
         Total common stockholders' equity                           2,967,857     3,018,968
   Preferred stock not subject to mandatory redemption                 235,197       235,197
Long-term debt                                                       2,581,499     2,506,068
                                                                   -----------   -----------
         Total capitalization                                        5,784,553     5,760,233
                                                                   -----------   -----------
Minority interest in consolidated subsidiary                             3,534         3,534
Current liabilities:
   Current maturity of long-term debt                                   82,185        52,241
   Short-term debt                                                      77,503        86,266
   Accounts and wages payable                                          163,252       293,391
   Accumulated deferred income taxes                                    64,240        56,094
   Taxes accrued                                                       176,218       110,566
   Other                                                               220,502       168,727
                                                                   -----------   -----------
         Total current liabilities                                     783,900       767,285
                                                                   -----------   -----------
Accumulated deferred income taxes                                    1,529,333     1,536,696
Accumulated deferred investment tax credits                            184,354       190,260
Regulatory liability                                                   208,514       224,225
Other deferred credits and liabilities                                 386,195       345,314
                                                                   -----------   -----------
Total Capital and Liabilities                                      $ 8,880,383   $ 8,827,547
                                                                   ===========   ===========

                                       7



                               AMEREN CORPORATION
                               ------------------
                        CONSOLIDATED STATEMENT OF INCOME
                        --------------------------------
                                    UNAUDITED
                                    ---------
           (Thousands of Dollars, Except Shares and Per Share Amounts)



                                                  Three Months Ended           Six Months Ended           Twelve Months Ended
                                                      June 30,                     June  30,                     June 30,
                                           ---------------------------  ---------------------------   ---------------------------
                                                1998           1997           1998           1997           1998           1997
                                                ----           ----           ----           ----           ----           ----
                                                                                                            
 OPERATING REVENUES:
    Electric                              $    780,808   $    752,223   $  1,386,908   $  1,401,006   $  3,050,079   $  3,050,199
    Gas                                         39,277         36,646        131,615        143,894        237,536        254,469
    Other                                        1,692          2,952          4,064          6,584         10,031         12,607
                                          ------------   ------------   ------------   ------------   ------------   ------------
       Total operating revenues                821,777        791,821      1,522,587      1,551,484      3,297,646      3,317,275

 OPERATING EXPENSES:
    Operations
       Fuel and purchased power                207,179        199,757        372,084        402,397        806,132        852,199
       Gas                                      23,085         24,118         75,289         91,956        144,012        165,480
       Other                                   155,136        142,116        301,891        281,848        605,257        561,040
                                          ------------   ------------   ------------   ------------   ------------   ------------
                                               385,400        365,991        749,264        776,201      1,555,401      1,578,719
    Maintenance                                 92,425         84,368        157,428        151,907        315,762        303,445
    Depreciation and amortization               86,061         86,450        172,915        172,962        345,953        344,620
    Income taxes                                58,798         57,085         88,709         89,929        232,959        244,727
    Other taxes                                 70,935         65,435        135,681        132,532        274,860        271,947
                                          ------------   ------------   ------------   ------------   ------------   ------------
      Total operating expenses                 693,619        659,329      1,303,997      1,323,531      2,724,935      2,743,458

 OPERATING INCOME                              128,158        132,492        218,590        227,953        572,711        573,817

 OTHER INCOME AND DEDUCTIONS:
    Allowance for equity funds used
       during construction                       1,204            880          2,267          1,974          5,537          4,944
    Miscellaneous, net                          (1,640)        (4,927)        (4,786)        (9,019)        (6,111)       (21,399)
                                          ------------   ------------   ------------   ------------    -----------   ------------
      Total other income and deductions           (436)       (4,047)        (2,519)        (7,045)          (574)       (16,455)

 INCOME BEFORE INTEREST
    CHARGES AND PREFERRED
    DIVIDENDS                                  127,722        128,445        216,071        220,908        572,137        557,362

 INTEREST CHARGES AND
    PREFERRED DIVIDENDS:
    Interest                                    42,732         47,350         90,227         93,421        182,174        183,686
    Allowance for borrowed funds
       used during construction                 (1,728)        (1,725)        (3,989)        (3,427)        (8,024)        (6,841)
    Preferred dividends of subsidiaries          3,086          3,134          6,274          6,251         12,555         14,732
                                          ------------   ------------   ------------   ------------   ------------   ------------
      Net interest charges and preferred
         dividends                              44,090         48,759         92,512         96,245        186,705        191,577

 INCOME BEFORE
    EXTRAORDINARY CHARGE                        83,632         79,686        123,559        124,663        385,432        365,785
                                          ------------   ------------   ------------   ------------   ------------   ------------

 EXTRAORDINARY CHARGE
    (NET OF INCOME TAXES)                         --             --             --             --          (51,820)          --
                                          ------------   ------------   ------------   ------------   ------------   ------------

 NET INCOME                               $     83,632   $     79,686   $    123,559   $    124,663   $    333,612   $    365,785
                                          ============   ============   ============   ============   ============   ============

 EARNINGS PER COMMON SHARE -
    BASIC AND DILUTED (Based on
         average shares outstanding)
    Income before extraordinary charge    $       0.61   $       0.58   $       0.90   $       0.91   $       2.81   $       2.67
    Extraordinary charge                          --             --             --             --            (0.38)          --
                                          ------------   ------------   ------------   ------------   ------------   ------------
    Net income                            $       0.61   $       0.58   $       0.90   $       0.91   $       2.43   $       2.67

 AVERAGE COMMON SHARES
    OUTSTANDING                            137,215,462    137,215,462    137,215,462    137,215,462    137,215,462    137,215,462

                                       8




                               AMEREN CORPORATION
                               ------------------
                      CONSOLIDATED STATEMENT OF CASH FLOWS
                      ------------------------------------
                                    UNAUDITED
                                    ---------
                             (Thousands of Dollars)





                                                         Six Months Ended
                                                              June 30,
                                                       ----------------------
                                                          1998         1997
                                                       ---------    ---------
                                                             
Cash Flows From Operating:
   Net income                                          $ 123,559    $ 124,663
   Adjustments to reconcile net income to net cash
      provided by operating activities:
        Depreciation and amortization                    167,895      170,137
        Amortization of nuclear fuel                      16,182       19,901
        Allowance for funds used during construction      (6,256)      (5,401)
        Deferred income taxes, net                       (11,462)      (1,237)
        Deferred investment tax credits, net              (5,906)      (4,752)
        Changes in assets and liabilities:
           Receivables, net                              (70,231)      (8,274)
           Materials and supplies                         (6,225)      12,611
           Accounts and wages payable                   (130,139)    (104,822)
           Taxes accrued                                  65,652       75,399
           Credits to customers                           42,316      (25,321)
           Other, net                                     60,187      (33,492)
                                                      ----------   ----------
Net cash provided by operating activities                245,572      219,412

Cash Flows From Investing:
   Construction expenditures                            (138,849)    (199,350)
   Allowance for funds used during construction            6,256        5,401
   Nuclear fuel expenditures                              (9,352)     (10,401)
   Other                                                  11,820       (4,488)
                                                      ----------   ----------
Net cash used in investing activities                   (130,125)    (208,838)

Cash Flows From Financing:
   Dividends on common stock                            (174,264)    (168,023)
   Redemptions -
      Nuclear fuel lease                                 (51,152)     (12,717)
      Short-term debt                                     (8,763)        --
      Long-term debt                                     (10,000)    (106,000)
      Preferred stock                                       --        (63,924)
   Issuances -
      Nuclear fuel lease                                   7,620       20,703
      Short-term debt                                       --         54,413
      Long-term debt                                     158,500      292,000
                                                      ----------   ----------
Net cash provided by (used in) financing activities      (78,059)      16,452
Net increase in cash and cash equivalents                 37,388       27,026
Cash and cash equivalents at beginning of year             9,696       11,899
                                                      ----------   ----------
Cash and cash equivalents at end of period             $  47,084    $  38,925
                                                      ==========   ==========
Cash paid during the periods:
   Interest (net of amount capitalized)                $  88,005    $  84,889
   Income taxes, net                                   $  81,053    $  72,808


                                       9



AMEREN CORPORATION
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED)
JUNE  30, 1998

     Note 1 - Effective December 31, 1997, following the receipt of all required
state and federal  regulatory  approvals,  Union Electric Company (AmerenUE) and
CIPSCO  Incorporated  (CIPSCO) combined to form Ameren Corporation  (Ameren)(the
Merger).  The  accompanying  consolidated  financial  statements  (the financial
statements)  reflect the accounting for the Merger as a pooling of interests and
are  presented  as if the  companies  were  combined as of the  earliest  period
presented.  However, the financial information is not necessarily  indicative of
the  results of  operations,  financial  position  or cash flows that would have
occurred had the Merger been  consummated  for the periods for which it is given
effect,  nor is it  necessarily  indicative  of future  results  of  operations,
financial  position or cash flows.  The outstanding  preferred stock of AmerenUE
and Central  Illinois  Public  Service  Company  (AmerenCIPS),  a subsidiary  of
CIPSCO, were not affected by the Merger.

     The accompanying  financial  statements  include the accounts of Ameren and
its consolidated  subsidiaries  (collectively the Registrant).  All subsidiaries
for which the Registrant owns directly or indirectly more than 50% of the voting
stock are included as  consolidated  subsidiaries.  Ameren's  primary  operating
companies,  AmerenUE and AmerenCIPS,  are engaged principally in the generation,
transmission,  distribution  and  sale of  electric  energy  and  the  purchase,
distribution,  transportation  and sale of natural gas in the states of Missouri
and Illinois.  The Registrant  also has a  non-regulated  investing  subsidiary,
CIPSCO Investment Company (CIC), and a non-utility energy marketing  subsidiary,
Ameren Energy,  Inc. The Registrant has a 60% interest in Electric Energy,  Inc.
(EEI). EEI owns and operates an electric generation and transmission facility in
Illinois that supplies  electric power primarily to a uranium  enrichment  plant
located in Paducah, Kentucky.

     All significant intercompany balances and transactions have been eliminated
from the consolidated financial statements.

     Note  2 -  Financial  statement  note  disclosures,  normally  included  in
consolidated financial statements prepared in conformity with generally accepted
accounting principles, have been omitted in this Form 10-Q pursuant to the Rules
and  Regulations  of the  Securities and Exchange  Commission.  However,  in the
opinion  of the  Registrant,  the  disclosures  contained  in this Form 10-Q are
adequate  to make  the  information  presented  not  misleading.  See  Notes  to
Consolidated Financial Statements included in the 1997 Form 10-K for information
relevant to the consolidated  financial  statements contained in this Form 10-Q,
including  information  as  to  the  significant   accounting  policies  of  the
Registrant.

     Note 3 - In the opinion of the Registrant, the interim financial statements
filed as part of this Form 10-Q  reflect  all  adjustments,  consisting  only of
normal recurring adjustments,  necessary for a fair statement of the results for
the periods presented.  The Registrant's  consolidated financial statements were
prepared to permit the  information  required  in the  Financial  Data  Schedule
(FDS),  Exhibit 27, to be directly extracted from the filed statements.  The FDS
amounts  correspond  to or are  calculable  from  the  amounts  reported  in the
consolidated financial statements or notes thereto.

     Note 4 - Due to the effect of weather on sales and other  factors which are
characteristic of public utility  operations,  financial results for the periods
ended June 30, 1998 and 1997, are not  necessarily  indicative of trends for any
three-month, six-month or twelve-month period.

     Note 5 - On July 21, 1995, the Missouri Public Service  Commission  (MoPSC)
approved  an  agreement  involving   AmerenUE's  Missouri  electric  rates.  The
Agreement included a three-year  experimental  alternative  regulation plan that
provides that earnings in excess of a 12.61 percent  regulatory return on equity
(ROE) will be shared equally  between  customers and  shareholders  and earnings
above 14 percent ROE will be credited to  customers.  The formula for  computing
the credit uses  twelve-month  results ending June 30, rather than calendar year
earnings.  During the six months ended June 30, 1998, the Registrant recorded an
estimated $43 million  credit for the third year of the plan,  compared to a $20
million  credit  recorded  for the same  1997  period.  This  credit,  which the
Registrant  expects to pay to Missouri  customers later this year, was reflected
as a reduction in electric revenues.

                                       10


     A new three-year  experimental  alternative regulation plan was included in
the joint  agreement  approved by the MoPSC in its February 1997 order approving
the Merger.  Like the current  plan,  the new plan requires that earnings over a
12.61  percent  ROE up to a 14  percent  ROE  will  be  shared  equally  between
customers  and  stockholders.  The new  three-year  plan  will  also  return  to
customers 90 percent of all  earnings  above a 14 percent ROE up to a 16 percent
ROE. Earnings above a 16 percent ROE will be credited entirely to customers. The
joint agreement also provides for a Missouri  electric rate decrease,  effective
September  1, 1998,  based on the  weather-adjusted  average  annual  credits to
customers under the current experimental alternative regulation plan.

     Note 6 -  Statement  of  Financial  Accounting  Standards  (SFAS) No.  130,
"Reporting  Comprehensive  Income" became effective on January 1, 1998. SFAS 130
requires  that all items that are  required to be  recognized  under  accounting
standards as  components  of  comprehensive  income be reported in the financial
statements  with the same prominence as other  financial  statement  components.
Adoption of SFAS 130 did not have a material  effect on the financial  position,
results of operations, liquidity or presentation of financial information of the
Registrant.

     Note 7 -  Certain  reclassifications  were  made  to  prior-year  financial
statements to conform with current-period presentation.

                                       11


                           PART II. OTHER INFORMATION


ITEM 5.        OTHER INFORMATION

     Any stockholder  proposal  intended for inclusion in the proxy material for
the  Registrant's  1999  annual  meeting of  stockholders  must be  received  by
November 23, 1998.

     In addition,  under the  Registrant's  By-Laws,  shareholders who intend to
submit a proposal  in person at an Annual  Meeting,  or who intend to nominate a
director at a Meeting,  must  provide  advance  written  notice along with other
prescribed  information.  In  general,  said  notice  must  be  received  by the
Secretary of the  Registrant not later than 60 nor earlier than 90 days prior to
the Meeting.  For the Registrant's  1999 annual meeting of stockholders,  such a
proposal  should be received  not later than  February 27, 1999 nor earlier than
January 28, 1999.


ITEM 6.        EXHIBITS AND REPORTS ON FORM 8-K

         (a)   Exhibits.

               Exhibit 27 - Financial Data Schedule.

         (b)   Reports on Form 8-K.  None




                                   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.


                               AMEREN CORPORATION
                                  (Registrant)



August 13, 1998                              By        /s/ Donald E. Brandt
                                                  ---------------------------
                                                           Donald E. Brandt
                                                  Senior Vice President, Finance


                                       12