One year ago today, Constellation Energy (NYSE: CEG), the nation's leading competitive electricity supplier to business and public sector customers, began offering Illinois residents an easy way to get low energy rates and embrace green energy by choosing Constellation as their home electricity supplier. Today, thousands of Illinois homeowners and renters have taken advantage of Constellation’s offers to save on home electric rates, and in the process helped Constellation surpass its goal of more than 1 million residential customers nationwide. As a national competitive energy supplier able to leverage energy market prices, Constellation is currently offering to Illinois’ ComEd and Ameren residents home electric supply rate savings up to 22 percent and 18 percent off of Ameren’s and ComEd’s current rates, respectively.* “Constellation is thrilled that Illinois residential consumers have responded to the low rates and trusted Constellation brand already known to thousands of Illinois business and government customers we have been serving for the past decade,” said Bruce Stewart, chief marketing officer for Constellation’s Retail business. “We continue to offer low home electric rates in Illinois and are particularly gratified that we can help meet the demand for green energy among a wide range of customers.” In addition to meeting the residential customer desire for green energy supply, Constellation has worked closely in the past year with Chicago’s storied sports franchises to enhance environmental stewardship. “The Chicago Bears, White Sox and Chicago Cubs all embraced the opportunity to advance clean energy this past year through Constellation’s sponsorship of ‘green games’ that avoided tons of carbon dioxide emissions,” said Stewart. “We’re looking forward to continuing that tradition with green games on April 1 and 2 for the Chicago Blackhawks and Chicago Bulls.” Constellation supports the sports teams’ sustainability goals through “green games” by purchasing Green-e Energy Certified renewable energy certificates (RECs) to match the electricity use on each game day. RECs represent the environmental benefit of electricity generated by wind and therefore avoid carbon dioxide emissions. Stewart noted that Constellation has also given new residential customers more than $5 million in gift card incentives nationwide. New residential customers who refer a friend may be eligible to receive a $25 gift card. The offer to Illinois homeowners and renters is made by Constellation NewEnergy, Inc., a wholly owned subsidiary of Constellation Energy Group, Inc. Consumers may find out more at home.constellation.com or by calling 866.577.4700 to sign up by phone. The Illinois Commerce Commission ( ICC) is the state agency that oversees the competitive retail electric market in Illinois. Additional information about customer choice and competition in the Illinois retail electric market can be found on the Illinois Commerce Commission’s website at: http://www.pluginillinois.org/. *AMEREN'S AND COMED’S RATES ARE SUBJECT TO CHANGE AND, THEREFORE, WE CANNOT GUARANTEE SAVINGS OVER THE FULL TERM OF OUR PRICE PLANS. Constellation’s prices do not include any taxes, utility distribution charges or other utility fees, charges or credits. In Ameren’s service territory, estimated savings are based on Ameren’s current BGS residential (non-electric space heating) rate of 6.685 cents per kWh in effect Oct. 1, 2011 – May 31, 2012 for Ameren Rate Zone I. Actual savings will depend on the Ameren rate zone in which customer resides, as shown on customer’s Ameren invoice. Customers on Ameren’s BGS residential (electric space heating) rate will not save. In ComEd’s service territory, estimated savings are based on ComEd's current Price to Compare (PTC) for BES residential (non-electric space heating) rate of 7.751 cents per kWh in effect Oct. 1, 2011 – May 31, 2012, which includes an Electricity Supply Charge of 6.986 cents and a Transmission Services Charge of 0.765 cents. ComEd also invoices its customers for Purchased Electricity Adjustment (PEA), which may be a charge or a credit, and is not included in ComEd’s PTC. Customers on ComEd's BES residential (electric space heating) rate will not save. For additional information on our price comparison, visit home.constellation.com . About Constellation Energy Constellation Energy ( www.constellation.com) is a leading competitive supplier of power, natural gas and energy products and services for homes and businesses across the continental United States. It owns a diversified fleet of generating units, totaling approximately 12,000 megawatts of generating capacity, and is a leading advocate for clean, environmentally sustainable energy sources, such as solar power and nuclear energy. The company delivers electricity and natural gas through the Baltimore Gas and Electric Company (BGE), its regulated utility in Central Maryland. A FORTUNE 500 company headquartered in Baltimore, Constellation Energy had revenues of $13.8 billion in 2011.