Constellation Energy Schedules First Quarter Earnings Release and Conference Call for Wednesday, April 27, 2005 BALTIMORE, April 12 /PRNewswire-FirstCall/ -- Constellation Energy (NYSE: CEG) today announced that it will release its first quarter 2005 earnings report Wednesday, April 27, 2005, and that a conference call to review these results has been scheduled for 8:30 a.m. (EDT) that day. To participate, analysts, investors, media and the public in the U.S. may dial (800) 862-9098 shortly before 8:30 a.m. The international phone number is (785) 424-1051. The conference password is ENERGY. A replay of the call will be available for one week by calling (888) 562-3376 (U.S.) or (402) 220-1185 (international). A live audio Webcast of the conference call, presentation slides and the earnings press release will be available at http://www.constellation.com/, on the Investors home page. The call will also be recorded and archived on Constellation Energy's Web site. Constellation Energy (http://www.constellation.com/), a FORTUNE 200 company based in Baltimore, is the nation's leading competitive supplier of electricity to large commercial and industrial customers and the nation's largest wholesale power sellers. Constellation Energy also manages fuels and energy services on behalf of energy intensive industries and utilities. It owns or co-owns 107 generating units at 35 locations in 11 states, totaling approximately 12,500 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. In 2004, the combined revenues of the integrated energy company totaled $12.5 billion. DATASOURCE: Constellation Energy CONTACT: Rob Gould (Media), +1-410-234-7433, or Kevin Hadlock (Investors), +1-410-783-3647 Web site: http://www.constellation.com/ Company News On-Call: http://www.prnewswire.com/comp/084087.html

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