Natural gas plant will help meet peak energy demand in Western U.S.

BALTIMORE, June 13, 2008 /PRNewswire-FirstCall via COMTEX News Network/ -- Constellation Energy
(NYSE: CEG) today announced it has completed the purchase of the West Valley
gas-fired peaking plant near Salt Lake City, Utah, from a unit of Iberdrola
Renewables, Inc. Constellation Energy assumed ownership and began operating
the power plant earlier this month.

A 200-megawatt natural gas plant, the West Valley plant was owned by West
Valley Leasing Company, LLC., but has been leased to PacifiCorp since the
plant began commercial operation in 2002.

"Constellation Energy's purchase of the West Valley plant will help us
competitively meet some of the growing peak energy demands in the western U.S.
energy markets," said John Long, president of Constellation Power Generation,
a subsidiary of Constellation Energy. "The West Valley plant provides
Constellation Energy with a strategically located generation asset in a key
western market, the Salt Lake City area, which is a regional energy center for
electricity load. We're committed to operating this facility as is the case
with all of our other generating facilities -- with a dedication to both
safety and environmental stewardship."

The West Valley plant operates during peak demand periods, such as hot
summer and cold winter days. By permit design, the plant is limited to
operating a certain number of hours per year.

Constellation Energy also is a part owner and operator of the Sunnyside
Cogeneration plant, a power plant fueled by waste coal located outside Price,
Utah.

With the addition of West Valley, Constellation Energy now has ownership
interest in 30 power plants in six states. The company also has two plants
currently under construction: the Hillabee Energy Center, a natural gas-fueled
power project near Alexander City, Ala., which is scheduled to go online in
2010; and the Grand Prairie Power Project in Alberta, Canada, an 85-megawatt
natural gas-fired peaking plant scheduled to being operating later this year.

Constellation Energy (http://www.constellation.com), a FORTUNE 125 company
with 2007 revenues of $21 billion, is the nation's largest competitive
supplier of electricity to large commercial and industrial customers and the
nation's largest wholesale power seller. Constellation Energy also manages
fuels and energy services on behalf of energy intensive industries and
utilities. It owns a diversified fleet of 78 generating units located
throughout the United States, totaling approximately 8,700 megawatts of
generating capacity. The company delivers electricity and natural gas through
the Baltimore Gas and Electric Company (BGE), its regulated utility in Central
Maryland.

SOURCE Constellation Energy

http://www.constellation.com

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