Boca Raton, FL - May 20, 2008 (News Release)

Green Business Alliance, an organization committed to the integration of environmental stewardship into daily business practices, today announced that it has entered into a relationship with Constellation NewEnergy, a leading competitive supplier of electricity, natural gas and energy-related services to commercial, industrial and institutional customers throughout North America. Members and participating businesses in the Green Business Alliance’s “Greenify” program can purchase Renewable Energy Certificates (RECs) from Constellation NewEnergy.

“We are very pleased that we have secured this effort with an experienced player such as Constellation NewEnergy, which has a proven track record of providing renewable energy for customers of all sizes, including small to medium-sized business customers,” said Hilary Kusel, Executive Director of Green Business Alliance. “Offering our members access to a leading industry provider solidifies the high standards we have developed in our ‘Guidelines to Greenify’ and simplifies the participation process.”

RECs represent the environmental attributes of one MWh (megawatt hour) of generation. Companies that purchase RECs are supporting the operation of facilities that generate renewable energy. Constellation NewEnergy offers a suite of products that are made up of wind, solar, biomass, landfill and hydroelectric resources.

“This relationship with Green Business Alliance was a natural fit for Constellation NewEnergy,” said Carrie Cullen Hitt, vice president of product management - renewable products for Constellation NewEnergy. “Constellation NewEnergy and Green Business Alliance are committed to making renewable energy solutions more accessible to businesses of all types and sizes throughout the United States.”

About Green Business Alliance

Green Business Alliance has assumed a leading role in enabling businesses to understand what it means to Go Green, identifying attainable objectives and then implementing more environmentally responsible business practices. Green Business Alliance helps companies Greenify for Better Business. Greenifying a company can help support the environment and can also provide a more compelling reason for prospective customers to work with the business. The company is based in Boca Raton, Florida and can be found on the web at www.greenbusinessalliance.com.

About Constellation NewEnergy

Constellation NewEnergy (www.newenergy.com), a wholly owned subsidiary of Constellation Energy (NYSE: CEG), is a leading competitive supplier of electricity, natural gas and energy-related services to commercial, industrial and institutional customers throughout North America. Constellation NewEnergy operates in all competitive energy markets throughout Canada and the United States, providing products that enable customers to effectively manage and control energy costs. Constellation NewEnergy’s regional expertise, coupled with its national presence, provides customers with customized energy products and services while leveraging the assets of one of the strongest integrated energy companies in North America. Constellation NewEnergy, based in Baltimore, serves more than 19,000 commercial, industrial and institutional customers throughout 31 states and three Canadian provinces representing nearly 14,000 megawatts of peak load and more than 354 billion cubic feet of annual natural gas consumption.

About Constellation Energy

Constellation Energy (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.