Ameren service territory that includes more than 7 percent of
the state’s population and 35 percent of its surface area
• Pinckneyville Power Plant
Perry County, Ill.
Corporate Facts — including Quincy and East St. Louis to the west and
Mattoon and Marion to the east and south.
Founded in 1923, AmerenIP provides electric
Size: 316 MW,
Purchased 2005 from an affiliate;
Began Operation: 2000
NYSE ticker symbol: AEE service to about 626,000 electric customers — an • Raccoon Creek Power Plant
aggregate population of 1.5 million — in 313 incorpo- Clay County, Ill.
ADDRESS One Ameren Plaza rated municipalities across 15,000 square miles of cen- Size: 304 MW, Purchased 2006
1901 Chouteau Avenue tral, east central and southern Illinois. AmerenIP pro- • Venice Power Station
St. Louis, MO 63103 vides service to nine cities with populations greater Venice, Ill.
than 30,000, including Danville, Decatur, Belleville, Size: 500 MW, Began Operation: 2005
WEB ADDRESS: www.ameren.com Bloomington-Normal, Champaign-Urbana, Galesburg Other CTG units totaling around 413
For more detailed information see Securities & and Granite City. megawatts.
Exchange Commission Filings found at Founded in 1902, AmerenUE — Missouri’s largest
www.ameren.com on the Investors page. Hydroelectric Plants
electric utility — provides electric service to approxi-
• Keokuk Plant
mately 1.2 million customers across central and east-
Ameren Corporation is the parent of: Keokuk, Iowa
ern Missouri, including the greater St. Louis area. UE
• AmerenCILCO, based in Peoria, Ill.; Size: 137 MW, Began Operation: 1913
serves 57 Missouri counties and 500 towns. More than
• AmerenCIPS, based • Osage Plant
half (55 percent) of UE’s electric customers are locat-
in Springfield, Ill.; Lakeside, Mo.
ed in the St. Louis metropolitan area.
• AmerenIP, based in Size: 234 MW, Began Operation: 1931
Decatur, Ill.; and • Taum Sauk Plant
E L E C T R I C G E N E R AT I O N
• AmerenUE, based in (pumped storage)
Ameren companies’ net generating capacity is
St. Louis, Mo. Reynolds County, Mo.
approximately 16,500 megawatts (MW), including
Ameren was created by the Size: 440 MW, Began Operation: 1963
Ameren’s 80 percent share of Electric Energy, Inc.,
December 1997 merger of CIPSCO Not currently in service
Joppa, Ill., generating facilities.
Incorporated and Union Electric Company. In 2003,
Ameren grew with the acquisition of CILCORP Inc., N O N - R AT E - R E G U L AT E D
R E G U L AT E D O P E R AT I O N S
parent of Central Illinois Light Company, now operat- O P E R AT I O N S
ing as AmerenCILCO, and in 2004, Ameren acquired Ameren Energy Generating Company:
Illinois Power Company — now operating as Coal-fired Facilities
• Labadie Plant Primarily Coal-fired Facilities
AmerenIP — from Dynegy Inc. Ameren employees,
Franklin County, Mo. • Coffeen Power Plant
totaling approximately 9,500, provide energy services
Size: 2,405 MW, Began Operation: 1970 Montgomery County, Ill.
to approximately 2.4 million electric customers and
• Meramec Plant Size: 900 MW, Began Operation: 1965
nearly one million natural gas customers across
St. Louis County, Mo. • Hutsonville Power Plant
64,000 square miles in Illinois and Missouri.
Size: 841 MW, Began Operation: 1953 Crawford County, Ill.
Ameren includes among its subsidiaries, in addi-
• Rush Island Plant Size: 151 MW, Began Operation: 1953
tion to AmerenCILCO, AmerenCIPS, AmerenIP and
Jefferson County, Mo. • Meredosia Power Plant
AmerenUE, the following operating entities:
Size: 1,181 MW, Began Operation: 1976 Morgan County, Ill.
• Ameren Energy Resources Company, LLC,
• Sioux Plant Size: 464 MW (308 MW coal, 156 MW oil),
the holding company for non-rate-regulated
St. Charles County, Mo. Began Operation: 1948
generation, development, marketing and fuels
Size: 986 MW, Began Operation: 1967 • Newton Power Plant
services companies — Ameren Energy
Jasper County, Ill.
Generating Company, Ameren Energy Medina Nuclear Plant
Size: 1,198 MW, Began Operation: 1977
Valley Cogen, LLC, Ameren Energy Marketing; • Callaway Nuclear Plant
• Ameren Energy Resources Generating — an Callaway County, Mo. Combustion Turbines (CTG)
AmerenCILCO subsidiary that operates non- Size: 1,190 MW, Began Operation: 1984 Natural Gas-fired Facilities
rate-regulated generation; and • Columbia Energy Center
Combustion Turbines (CTG)
• Ameren Services, which provides support Boone County, Mo.
Natural Gas or Oil-fired Facilities
services to the corporation and its subsidiaries. Size: 140 MW, Began Operation: 2001
• Audrain Power Plant
• Elgin Energy Center
Audrain County, Mo.
ELECTRIC UTILITIES Cook County, Ill.
Size: 608 MW, Purchased 2006.
AmerenCILCO provides electricity to approximate- Size: 460 MW, Began Operation: 2002
• Goose Creek Power Plant
ly 210,000 customers in 19 counties, serving towns • Gibson City Power Plant
Piatt County, Ill.
in east and central Illinois. Founded in 1913, Ford County, Ill.
Size: 438 MW, Purchased 2006
AmerenCILCO provides gas and electric services to Size: 228 MW, Began Operation: 2000
• Kinmundy Power Plant
Peoria and 26 surrounding communities. • Grand Tower Power Plant
Marion County, Ill.
AmerenCIPS provides electric service in 70 coun- Jackson County, Ill.
Size: 232 MW,
ties throughout a 20,500-square-mile area. Founded Size: 511 MW, Began Operation: 1951
Purchased 2005 from an affiliate;
in 1902, AmerenCIPS today serves nearly 400,000 Repowered in 2001
Began Operation: 2001
retail electric customers in 576 communities with a • Joppa (1-3)
• Peno Creek Power Plant
Bowling Green, Mo.
Size: 165 MW, Began Operations: 2000
Size: 188 MW, Began Operation: 2002
AmerenEnergy Medina Valley Cogen, LLC ILLINOIS Illinois
Natural Gas-fired Facility Chicago
On Jan. 2, 2007, new electric rates for the Ameren
• Medina Valley Cogen Plant Illinois utilities went into effect, reflecting delivery
Mossville, Ill. Medina Valley
service tariffs approved by the Illinois Commerce
Size: 44 MW, Began Operation: 2001 E. D. Edwards
Commission (ICC) in November 2006 and full cost
Produces electricity, steam and chilled Duck Creek
recovery of power purchased on behalf of Ameren
water for Caterpillar Inc.’s adjacent Gibson City Illinois utilities’ customers in the September 2006 auc-
• tion. These new electric prices significantly increased
engine manufacturing facility. Springfield Goose Creek
Decatur customers’ energy bills. Due to the magnitude of
Electric Energy, Inc. Facilities: Audrain
these rate increases, various legislators supported leg-
• Kansas City
islation that would have reduced and frozen the
# Coffeen Newton
• Joppa Generating Station Callaway
St. Louis • Ameren Illinois utilities’ electric rates at the levels in
# Raccoon Creek
Joppa, Ill. Jefferson City
effect prior to Jan. 2, 2007. The legislation would
Size: 1,002 MW, Began Operation: 1953 •
Osage Rush Island
Kinmundy have imposed a tax on electric generation in Illinois
to help fund customer assistance programs. The
Combustion Turbines (CTG) •
Taum Sauk Illinois governor also supported rate rollback and
Natural Gas-fired Facility freeze legislation.
• Joppa CTGs (4-5) MISSOURI Joppa
In July 2007, an agreement was reached among key
Joppa, Ill. stakeholders in Illinois to avoid this and address the
Size: 74 MW, Began Operation: 2000 increase in electric rates and the future power pro-
AmerenUE Coal-Fired Plants
Ameren Energy Resources Generating curement process in Illinois. The agreement included
Facilities: • AmerenUE Hydro Plants
a comprehensive rate relief and customer assistance
# AmerenUE Nuclear Plant
program — which constructively resolved significant
Coal-fired Facilities AmerenUE CTGs
legislative, regulatory and legal uncertainty and avoid-
• Duck Creek Plant Ameren Energy Resources Generating Coal-Fired Plants
ed the potential for significant incremental costs —
Canton, Ill. Ameren Energy Medina Valley Cogeneration Plant
and with the passage of legislation, took effect on Aug.
Size: 410 MW, Began Operation: 1976 Ameren Energy Generating Coal-Fired Plants
28, 2007. The agreement provides approximately $1
• E.D. Edwards Plant Ameren Energy Generating CTGs
billion of funding for rate relief for certain electric
Bartonville, Ill. • Ameren Energy Generating Coal-, Oil- & Gas-Fired Plant
customers in Illinois, including approximately $488
Size: 715 MW, Began Operations: 1960 Electric Energy, Inc. (80 percent owned by Ameren)
million to customers of the Ameren Illinois utilities.
NATURAL GAS OPERATIONS In September 2008, the ICC issued an order
The combined natural gas operations of authorizing a net rate increase in annual revenues for
AmerenCILCO, AmerenCIPS and AmerenUE serves gas customers in more than 90 electric delivery service totaling $123 million for the
AmerenIP rank as the third largest Illinois Missouri communities, including towns in southeast, Ameren Illinois utilities. The electric rate changes
natural gas distribution operation in total central and eastern Missouri. The company owns were effective on Oct. 1, 2008.
number of customers. AmerenUE is the 3,200 miles of natural gas transmission and
third largest distributor of natural gas distribution mains. Natural Gas Rates
in Missouri. Missouri
AmerenCILCO serves approximately RATES AND REGULATION As part of a 2007 stipulation and agreement
216,000 Illinois customers, including the approved by the MoPSC authorizing an increase in
cities of Peoria and Springfield, and is Electric Rates annual natural gas delivery revenues of $6 million
directly connected to five interstate natural Missouri effective April 1, 2007, AmerenUE agreed not to file a
gas pipelines with the ability to purchase In 2007, AmerenUE was granted a 2.1% overall elec- natural gas delivery rate case before March 15, 2010.
from multiple suppliers. AmerenCILCO has tric rate increase of approximately $43 million. Until The 2007 stipulation and agreement did not pre-
about 3,900 miles of natural gas transmis- the 2007 increase, UE had not had an electric rate vent UE from filing to recover gas infrastructure
sion and distribution mains and two under- increase since 1987. replacement costs through an infrastructure system
ground storage fields with eight billion March 1, 2009, a 7.8 percent rate increase took replacement surcharge (ISRS) during the rate mora-
cubic feet of capacity. effect for UE Missouri electric customers. The Missouri torium. During 2008, the MoPSC approved two UE
AmerenCIPS has provided natural gas Public Service Commission (MoPSC) approved an requests to establish an ISRS to recover annual rev-
service for more than 75 years and today increase for UE in annual revenues for its electric serv- enues of $2 million in the aggregate, effective in
distributes natural gas to nearly 190,000 ice territory of approximately $162 million. The rate March and November 2008.
customers in more than 270 Illinois commu- increase was needed to cover the cost of reliability UE’s gas rates may also be adjusted without a tradi-
nities. AmerenCIPS operates 5,300 miles of improvements and rising costs for the materials the tional rate proceeding for changes in the wholesale
natural gas transmission and distribution company uses to safely generate and deliver electricity. costs of gas, which are passed through to customers
mains. It also owns and operates three The MoPSC also approved UE’s implementation of a without mark-up from UE (the purchased gas adjust-
underground storage fields, with a total fuel and purchased power cost recovery mechanism ment, or PGA).
capacity of approximately two billion (FAC). The FAC provides for the adjustment of electric
cubic feet. rates three times per year for a pass-through to cus- Illinois
AmerenIP supplies retail natural gas to tomers of 95% of changes in fuel and purchased power In September 2008, AmerenCIPS, AmerenCILCO
421,000 customers in 258 incorporated costs net of off-system revenues, subject to a MoPSC and AmerenIP received from the ICC a consolidated
municipalities and adjacent areas. The prudency review. This mechanism allows UE to more order approving a net increase in annual revenues for
company owns 8,700 miles of natural gas quickly recover the money the company must spend on natural gas delivery service of $38 million in the aggre-
transmission and distribution mains and fuel to run its power plants and cover its purchased gate. Rate changes implementing these adjustments
seven underground natural gas storage power costs — without the time and expense required became effective in October 2008. The ICC also
fields with a total capacity of approximately for a full rate case. approved an increase in the percentage of costs to be
15 billion cubic feet. The MoPSC will continue to have regulatory over- recovered through fixed monthly charges for residen-
About 126,000 of AmerenUE’s 1.2 million sight over the FAC-adjusted rates. The fuel and pur- tial and commercial natural gas customers.
customers are natural gas customers. chased power adjustment clause does not generate
additional profits for UE.