Constellation Energy names Shaffer general manager of new Nashville District Energy System

NASHVILLE, Tenn., Dec. 23, 2003 — Constellation Energy Group announced that its subsidiary, Constellation Energy Source, has named John Schaffer to the position of general manager of the new Nashville District Energy System (DES), the $48.2 million facility which replaced the Nashville Thermal Transfer plant on Dec. 15.

The City of Nashville retained Constellation Energy Source to design, build, operate and maintain the DES under a multi-year agreement.

“John Shaffer has done a remarkable job operating the existing DES plant and assisting with the construction of the new district energy system for Nashville. As such, he is the right person to manage the facility as we enter this next phase of the project,” said Greg Jarosinski, president of Constellation Energy Source. “John’s ably dealt with countless other challenges, from managing and increasing the reliability of the existing thermal plant to helping construct and manage our district energy plants in Pittsburgh and Las Vegas.”

“When construction ends, Nashville will have the most advanced district energy system in the country, and we’re certainly lucky to have someone with John’s talent and experience to run it,” said David Manning, Metro Nashville’s director of finance.

Initially, the new system will provide heating and cooling for approximately 40 downtown buildings, including the state capitol and other government buildings, The Coliseum, and a number of privately owned office buildings and hotels. The centralized system provides an energy-efficient, environmentally sound method of heating and cooling buildings, eliminating the need for each to maintain individual boilers or furnaces, hot water heaters, chillers or air conditioners. With the capacity to provide 20,800 tons of cooling and 260,000 lbs per hour of steam heat, the new system is projected to lower heating and cooling costs immediately for its customers.

Constellation Energy Source will manage, operate and maintain the DES for 15 years, with options for extensions, while Metro Nashville will retain ownership of the system.

Schaffer joined Constellation Energy Source in May 2000. Prior to that, he managed energy projects for Trigen Energy Baltimore/Trigen-Cinergy Solutions, LLC. He also worked with Locke Insulators and Domino Sugars in Baltimore as an operations engineer. He served in the U.S. Navy for four years, and is a licensed first-class stationary engineer. He also is a past board member of the Association of Energy Engineers.

Schaffer resides in the Nashville area with his wife and two children.

Constellation Energy Source (CES), a member of Constellation Energy Group, provides customized energy solutions nationwide exclusively to government and large commercial and industrial customers with single or multiple locations. CES is a full-service energy consultant, offering clients an extensive array of products and services designed to increase energy efficiency, reliability and cost effectiveness. Applying superior energy technology knowledge and engineering expertise, CES specializes in build-own-operate-maintain projects, mechanical and electrical upgrades, utility data mining, performance contracting, financing and billing options, and procurement of the energy commodity.

Constellation Energy Group (, a Fortune 500 company based in Baltimore, is the nation’s leading competitive supplier of electricity to large commercial and industrial customers and one of the nation’s largest wholesale power sellers. Constellation also manages fuels and energy services on behalf of energy intensive industries and utilities. It owns and operates a diversified fleet of power plants throughout the United States. The company delivers electricity and natural gas through the Baltimore Gas and Electric Company (BGE), its regulated utility in Central Maryland. First nine months 2003 revenue totaled $7.2 billion.

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