SECURITIES AND EXCHANGE COMMISSION
                              WASHINGTON, DC 20549



                                    FORM 8-K


                                 CURRENT REPORT




     Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934



                Date of Report (Date of earliest event reported):
                                  July 16, 2002





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




       Missouri                        1-14756                  43-1723446
(State or other jurisdiction         (Commission             (I.R.S. Employer
    of incorporation)                File Number)            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


<PAGE>


ITEM 5.   OTHER EVENTS AND REGULATION FD DISCLOSURE

          On July 16, 2002, the Registrant issued a press release outlining the
details of a settlement  that has been reached in the  earnings  complaint  case
filed by the Missouri  Public  Service  Commission  staff against Union Electric
Company  d/b/a  AmerenUE,  the  Registrant's  subsidiary,   in  July  2001.  The
settlement is subject to the approval of the Missouri Public Service Commission.
The press  release  is  attached  as Exhibit  99 and is  incorporated  herein by
reference.


ITEM 7.   EXHIBITS

          (c) Exhibits.

              99   Press release, dated July 16, 2002, issued by the Registrant.



                                    SIGNATURE

     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)


                                         By   /s/ Martin J. Lyons
                                            --------------------------------
                                         Name:    Martin J. Lyons
                                         Title:   Controller
                                                 (Principal Accounting Officer)


Date:  July 16, 2002


<PAGE>


                                  Exhibit Index
                                  -------------

Exhibit No.                       Description
----------                        -----------

     99      - Press release dated July 16, 2002, issued by Ameren Corporation.





<PAGE>
                                                                    EXHIBIT 99

[GRAPHIC OMITTED][GRAPHIC OMITTED]
One Ameren Plaza
1901 Chouteau Avenue
St. Louis, MO 63103

Contact:
Analysts:                         Media:                    Investors:
Bruce Steinke                     Susan Gallagher           Investor Services
(314) 554-2574                    (314) 554-2175            Invest@ameren.com

FOR IMMEDIATE RELEASE
---------------------

               SETTLEMENT REACHED IN AMERENUE ELECTRIC RATE CASE;
                  NEW ALTERNATIVE RATE REGULATION PLAN PROPOSED

St.  Louis,  MO,  July 16,  2002---AmerenUE,  a  utility  subsidiary  of  Ameren
Corporation  (NYSE:  AEE), and all other parties  participating  in its electric
rate  case,  have  submitted  a joint  settlement  ("joint  settlement")  of its
electric rate case to the Missouri Public Service Commission (MoPSC).  The joint
settlement  includes a new alternative rate regulation plan incorporating a rate
moratorium  through June 30, 2006, the phase-in of $110 million in electric rate
reductions,  over $2 billion in critical energy infrastructure  commitments from
the  company,  and over $25  million in funding  during the term of the plan for
several  important  programs  that will benefit  low-income  consumers,  enhance
energy conservation and support the state's economic development efforts.

     In  addition,  under  the  joint  settlement,  AmerenUE's  Missouri  retail
electric  customers  will  receive $40  million in credits on electric  bills as
early as  August  2002.  The $40  million  in  credits  result  from  the  final
settlement  of earnings  sharing  benefits  under the  experimental  alternative
regulation  plan  (EARP),   which  expired  June  30,  2001.  Under  that  plan,
stockholders   and  customers   shared  earnings   between  certain   regulatory
return-on-equity thresholds.

     The specific terms of the joint settlement are as follows:

     o    An alternative  rate  regulation  plan that includes a rate moratorium
          through June 30, 2006.

     o    The phase-in of $110 million of electric rate reductions over the term
          of the  plan.  An  annualized  $50  million  rate  reduction  will  be
          retroactive  to April 1, 2002. An additional  $30 million  annual rate
          reduction  will  take  effect on April 1,  2003,  and  another  annual
          electric  rate  reduction  of $30 million will take effect on April 1,
          2004.
<PAGE>


     o    As early as August 2002,  a payment will be made to Missouri  electric
          customers  of $40  million in sharing  credits  under the EARP,  which
          expired on June 30, 2001.

     o    As early as Sept.  1,  2002,  the  company  will  also  make  up-front
          contributions to the following programs, with additional payments made
          annually on June 30, 2003 through June 30, 2006:

          >    $5 million in funding for low-income  customer energy assistance,
               with an additional $1 million paid in each of the following  four
               years,   bringing  the  total  commitment  to  low-income  energy
               assistance to $9 million under the plan.

          >    $2 million in funding for a  low-income  customer  weatherization
               program to make homes more  energy-efficient,  and an  additional
               $500,000 to that fund in each of the following four years.  Under
               the plan, total payments to this program will be $4 million.

          >    $2 million in funding to a program that will help residential and
               commercial customers improve the energy efficiency of their homes
               and  business  locations.  The  company  will  pay an  additional
               $500,000 to that fund in each of the  following  four years.  The
               total commitment to this program is $4 million under the plan.

          >    $5 million in funding for an economic development  program.  This
               program is  designed  to address  critical  economic  development
               initiatives  in the state of  Missouri.  The company will fund an
               additional $1 million in each of the following  four years of the
               plan, bringing total commitments to $9 million.

     o    The  company  commits  to making  $2.25  billion  to $2.75  billion in
          critical energy  infrastructure  investments  through June 30, 2006 to
          ensure that the state of  Missouri's  energy needs will be met.  These
          investments  include the  addition of more than 700  megawatts  of new
          generation capacity and the replacement of steam turbine generators at
          AmerenUE's nuclear power plant. These investments also include,  among
          other things,  improvements  to the company's  transmission  system to
          enhance the company's  ability to import power during  periods of high
          customer demand.

     o    Pilot  programs  that will offer  energy  management  and cost  saving
          alternatives for AmerenUE customers.

<PAGE>

     o    An overall  reduction  in the  company's  depreciation  expense by $20
          million per year.

     "The good faith  effort by all the parties  participating  in this case has
resulted in a win-win  approach  that will provide  significant  benefits to our
customers,  shareholders  and  employees,  and to the state of  Missouri,"  said
Charles W. Mueller,  chairman and chief executive officer,  Ameren  Corporation.
"This plan will provide  meaningfully  lower rates to our customers,  as well as
programs that will  significantly  benefit the needs of consumers and our state.
Further,  this plan  ensures  that  Missouri's  future  energy needs will be met
through our commitment to make significant  energy  infrastructure  investments,
while at the same time, providing the company with the financial  flexibility to
make these  infrastructure  investments  on a timely basis,  as well as bringing
solid returns to our investors."

     "Simply put, this forward-thinking  plan successfully  addresses the energy
and  regulatory  policy  issues  raised in this case," added Gary L.  Rainwater,
president and chief operating officer, Ameren Corporation. "In the end, the plan
provides for low,  stable rates,  continued  high levels of energy  reliability,
solid investor returns and incentives for the company to continue to improve its
operations and customer satisfaction."

     The joint settlement came in response to an excess earnings  complaint case
filed against  AmerenUE in July 2001. In this case, the Missouri  Public Service
Commission  staff  recommended  a reduction  in the  company's  annual  electric
revenues by $246 million to $285 million.  Other parties to the case recommended
additional electric revenue reductions. The joint settlement proposal is subject
to the  review  and  approval  by the MoPSC.  Hearings  on the joint  settlement
proposal  are likely to be  scheduled  within the next few weeks.  Copies of the
joint    agreement    can   be    obtained    from   the   MoPSC    website   at
http://www.psc.state.mo.us.

     If approved,  the impact of the joint settlement  proposal on Ameren's 2002
earnings per share is expected to be a reduction of approximately 22 cents. This
is consistent with  management's  expectations of the range of possible outcomes
in this case, already incorporated in Ameren's 2002 earnings guidance.

     AmerenUE is a subsidiary  of St.  Louis-based  Ameren  Corporation.  Ameren
companies serve 1.5 million electric customers and 300,000 natural gas customers
in a 44,500-square-mile area of Missouri and Illinois.

<PAGE>

 Safe Harbor Statement
 --------------------
     Statements made in this release,  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 company is 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 past and subsequent
securities  filings,  could cause results to differ  materially  from management
expectations as suggested by such "forward-looking" statements:

o    the effects of the pending  AmerenUE  excess  earnings  complaint  case and
     other regulatory actions, including changes in regulatory policy;
o    changes in laws and other governmental actions;
o    the impact on the company of current  regulations related to the phasing-in
     of  the  opportunity  for  some  customers  to  choose  alternative  energy
     suppliers in Illinois;
o    the effects of  increased  competition  in the future,  due to, among other
     things,  deregulation of certain aspects of the company's  business at both
     the state and federal levels;
o    the   effects   of   participation   in   a   Federal   Energy   Regulatory
     Commission-approved  Regional  Transmission  Organization (RTO),  including
     activities  associated with the Midwest Independent System Operator and the
     Alliance RTO;
o    future market prices for fuel and purchased power, electricity, and natural
     gas,  including  the  use  of  financial  and  derivative  instruments  and
     volatility of changes in market prices;
o    average rates for electricity in the Midwest;
o    business and economic conditions;
o    the impact of the adoption of new accounting standards;
o    interest rates and the availability of capital;
o    actions of ratings agencies and the effects of such actions;
o    weather conditions;
o    fuel prices and availability;
o    generation plant construction, installation and performance;
o    the  effects  of  strategic   initiatives,   including   acquisitions   and
     divestitures;
o    the impact of current environmental regulations on utilities and generating
     companies and the  expectation  that more  stringent  requirements  will be
     introduced over time,  which could  potentially  have a negative  financial
     effect;
o    monetary and fiscal policies;
o    future wages and employee benefits costs;
o    competition from other generating  facilities including new facilities that
     may be developed in the future;
o    cost and availability of transmission  capacity for the energy generated by
     the company's  generating  facilities  or required to satisfy  energy sales
     made by the company; and
o    legal and administrative proceedings.


                                      #  #  #
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{"company-data": {"conformed-name": "AMEREN CORP", "cik": "0001002910", "assigned-sic": "4931", "irs-number": "431723446", "state-of-incorporation": "MO", "fiscal-year-end": "1231"}, "filing-values": {"form-type": "8-K", "act": "34", "file-number": "001-14756", "film-number": "02703602"}, "business-address": {"street1": "1901 CHOUTEAU AVE", "street2": "MC 1370", "city": "ST LOUIS", "state": "MO", "zip": "63166-6149", "phone": "431723446"}, "mail-address": {"street1": "1901 CHOUTEAU AVE", "street2": "MC 1370", "city": "ST LOUIS", "state": "MO", "zip": "63103"}}
SECURITIES AND EXCHANGE COMMISSION
                              WASHINGTON, DC 20549

                                    FORM 8-K

                                 CURRENT REPORT

     Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

                Date of Report (Date of earliest event reported):
                                  July 16, 2002

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

       Missouri                        1-14756                  43-1723446
(State or other jurisdiction         (Commission             (I.R.S. Employer
    of incorporation)                File Number)            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
ITEM 5.   OTHER EVENTS AND REGULATION FD DISCLOSURE

          On July 16, 2002, the Registrant issued a press release outlining the
details of a settlement  that has been reached in the  earnings  complaint  case
filed by the Missouri  Public  Service  Commission  staff against Union Electric
Company  d/b/a  AmerenUE,  the  Registrant's  subsidiary,   in  July  2001.  The
settlement is subject to the approval of the Missouri Public Service Commission.
The press  release  is  attached  as Exhibit  99 and is  incorporated  herein by
reference.

ITEM 7.   EXHIBITS

          (c) Exhibits.

              99   Press release, dated July 16, 2002, issued by the Registrant.

                                    SIGNATURE

     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)

                                         By   /s/ Martin J. Lyons
                                            --------------------------------
                                         Name:    Martin J. Lyons
                                         Title:   Controller
                                                 (Principal Accounting Officer)

Date:  July 16, 2002
Exhibit Index
                                  -------------

Exhibit No.                       Description
----------                        -----------

     99      - Press release dated July 16, 2002, issued by Ameren Corporation.
EXHIBIT 99

[GRAPHIC OMITTED][GRAPHIC OMITTED]
One Ameren Plaza
1901 Chouteau Avenue
St. Louis, MO 63103

Contact:
Analysts:                         Media:                    Investors:
Bruce Steinke                     Susan Gallagher           Investor Services
(314) 554-2574                    (314) 554-2175            Invest@ameren.com

FOR IMMEDIATE RELEASE
---------------------

               SETTLEMENT REACHED IN AMERENUE ELECTRIC RATE CASE;
                  NEW ALTERNATIVE RATE REGULATION PLAN PROPOSED

St.  Louis,  MO,  July 16,  2002---AmerenUE,  a  utility  subsidiary  of  Ameren
Corporation  (NYSE:  AEE), and all other parties  participating  in its electric
rate  case,  have  submitted  a joint  settlement  ("joint  settlement")  of its
electric rate case to the Missouri Public Service Commission (MoPSC).  The joint
settlement  includes a new alternative rate regulation plan incorporating a rate
moratorium  through June 30, 2006, the phase-in of $110 million in electric rate
reductions,  over $2 billion in critical energy infrastructure  commitments from
the  company,  and over $25  million in funding  during the term of the plan for
several  important  programs  that will benefit  low-income  consumers,  enhance
energy conservation and support the state's economic development efforts.

     In  addition,  under  the  joint  settlement,  AmerenUE's  Missouri  retail
electric  customers  will  receive $40  million in credits on electric  bills as
early as  August  2002.  The $40  million  in  credits  result  from  the  final
settlement  of earnings  sharing  benefits  under the  experimental  alternative
regulation  plan  (EARP),   which  expired  June  30,  2001.  Under  that  plan,
stockholders   and  customers   shared  earnings   between  certain   regulatory
return-on-equity thresholds.

     The specific terms of the joint settlement are as follows:

     o    An alternative  rate  regulation  plan that includes a rate moratorium
          through June 30, 2006.

     o    The phase-in of $110 million of electric rate reductions over the term
          of the  plan.  An  annualized  $50  million  rate  reduction  will  be
          retroactive  to April 1, 2002. An additional  $30 million  annual rate
          reduction  will  take  effect on April 1,  2003,  and  another  annual
          electric  rate  reduction  of $30 million will take effect on April 1,
          2004.
o    As early as August 2002,  a payment will be made to Missouri  electric
          customers  of $40  million in sharing  credits  under the EARP,  which
          expired on June 30, 2001.

     o    As early as Sept.  1,  2002,  the  company  will  also  make  up-front
          contributions to the following programs, with additional payments made
          annually on June 30, 2003 through June 30, 2006:

          >    $5 million in funding for low-income  customer energy assistance,
               with an additional $1 million paid in each of the following  four
               years,   bringing  the  total  commitment  to  low-income  energy
               assistance to $9 million under the plan.

          >    $2 million in funding for a  low-income  customer  weatherization
               program to make homes more  energy-efficient,  and an  additional
               $500,000 to that fund in each of the following four years.  Under
               the plan, total payments to this program will be $4 million.

          >    $2 million in funding to a program that will help residential and
               commercial customers improve the energy efficiency of their homes
               and  business  locations.  The  company  will  pay an  additional
               $500,000 to that fund in each of the  following  four years.  The
               total commitment to this program is $4 million under the plan.

          >    $5 million in funding for an economic development  program.  This
               program is  designed  to address  critical  economic  development
               initiatives  in the state of  Missouri.  The company will fund an
               additional $1 million in each of the following  four years of the
               plan, bringing total commitments to $9 million.

     o    The  company  commits  to making  $2.25  billion  to $2.75  billion in
          critical energy  infrastructure  investments  through June 30, 2006 to
          ensure that the state of  Missouri's  energy needs will be met.  These
          investments  include the  addition of more than 700  megawatts  of new
          generation capacity and the replacement of steam turbine generators at
          AmerenUE's nuclear power plant. These investments also include,  among
          other things,  improvements  to the company's  transmission  system to
          enhance the company's  ability to import power during  periods of high
          customer demand.

     o    Pilot  programs  that will offer  energy  management  and cost  saving
          alternatives for AmerenUE customers.
o    An overall  reduction  in the  company's  depreciation  expense by $20
          million per year.

     "The good faith  effort by all the parties  participating  in this case has
resulted in a win-win  approach  that will provide  significant  benefits to our
customers,  shareholders  and  employees,  and to the state of  Missouri,"  said
Charles W. Mueller,  chairman and chief executive officer,  Ameren  Corporation.
"This plan will provide  meaningfully  lower rates to our customers,  as well as
programs that will  significantly  benefit the needs of consumers and our state.
Further,  this plan  ensures  that  Missouri's  future  energy needs will be met
through our commitment to make significant  energy  infrastructure  investments,
while at the same time, providing the company with the financial  flexibility to
make these  infrastructure  investments  on a timely basis,  as well as bringing
solid returns to our investors."

     "Simply put, this forward-thinking  plan successfully  addresses the energy
and  regulatory  policy  issues  raised in this case," added Gary L.  Rainwater,
president and chief operating officer, Ameren Corporation. "In the end, the plan
provides for low,  stable rates,  continued  high levels of energy  reliability,
solid investor returns and incentives for the company to continue to improve its
operations and customer satisfaction."

     The joint settlement came in response to an excess earnings  complaint case
filed against  AmerenUE in July 2001. In this case, the Missouri  Public Service
Commission  staff  recommended  a reduction  in the  company's  annual  electric
revenues by $246 million to $285 million.  Other parties to the case recommended
additional electric revenue reductions. The joint settlement proposal is subject
to the  review  and  approval  by the MoPSC.  Hearings  on the joint  settlement
proposal  are likely to be  scheduled  within the next few weeks.  Copies of the
joint    agreement    can   be    obtained    from   the   MoPSC    website   at
http://www.psc.state.mo.us.

     If approved,  the impact of the joint settlement  proposal on Ameren's 2002
earnings per share is expected to be a reduction of approximately 22 cents. This
is consistent with  management's  expectations of the range of possible outcomes
in this case, already incorporated in Ameren's 2002 earnings guidance.

     AmerenUE is a subsidiary  of St.  Louis-based  Ameren  Corporation.  Ameren
companies serve 1.5 million electric customers and 300,000 natural gas customers
in a 44,500-square-mile area of Missouri and Illinois.
Safe Harbor Statement
 --------------------
     Statements made in this release,  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 company is 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 past and subsequent
securities  filings,  could cause results to differ  materially  from management
expectations as suggested by such "forward-looking" statements:

o    the effects of the pending  AmerenUE  excess  earnings  complaint  case and
     other regulatory actions, including changes in regulatory policy;
o    changes in laws and other governmental actions;
o    the impact on the company of current  regulations related to the phasing-in
     of  the  opportunity  for  some  customers  to  choose  alternative  energy
     suppliers in Illinois;
o    the effects of  increased  competition  in the future,  due to, among other
     things,  deregulation of certain aspects of the company's  business at both
     the state and federal levels;
o    the   effects   of   participation   in   a   Federal   Energy   Regulatory
     Commission-approved  Regional  Transmission  Organization (RTO),  including
     activities  associated with the Midwest Independent System Operator and the
     Alliance RTO;
o    future market prices for fuel and purchased power, electricity, and natural
     gas,  including  the  use  of  financial  and  derivative  instruments  and
     volatility of changes in market prices;
o    average rates for electricity in the Midwest;
o    business and economic conditions;
o    the impact of the adoption of new accounting standards;
o    interest rates and the availability of capital;
o    actions of ratings agencies and the effects of such actions;
o    weather conditions;
o    fuel prices and availability;
o    generation plant construction, installation and performance;
o    the  effects  of  strategic   initiatives,   including   acquisitions   and
     divestitures;
o    the impact of current environmental regulations on utilities and generating
     companies and the  expectation  that more  stringent  requirements  will be
     introduced over time,  which could  potentially  have a negative  financial
     effect;
o    monetary and fiscal policies;
o    future wages and employee benefits costs;
o    competition from other generating  facilities including new facilities that
     may be developed in the future;
o    cost and availability of transmission  capacity for the energy generated by
     the company's  generating  facilities  or required to satisfy  energy sales
     made by the company; and
o    legal and administrative proceedings.

                                      #  #  #