Calpine’s RockGen Energy Center enters full operations

SAN JOSE, Calif., Aug. 8, 2001 – Calpine Corp. announced its RockGen Energy Center is in full production. The 460-MW peaking facility near Cambridge, Wis., is providing electricity to Wisconsin Power and Light Co. (WP&L) under the terms of a seven-year agreement.

RockGen’s production will allow WP&L to maintain sufficient generating ability to meet its peak electrical load, while preserving additional resources to provide a reserve margin. When WP&L does not call on the plant’s output, Calpine will sell electricity to the Wisconsin wholesale power market.

“By teaming with Wisconsin Power and Light to provide a native source of electric generation, RockGen will enhance the state’s electric reliability and provide Wisconsin consumers with needed electricity in times of peak demand, especially during the warm summer months,” said Calpine’s Andy Kellen, project director of RockGen.

Fueled by clean natural gas, the facility is operating in a simple-cycle configuration, using three natural gas-fired combustion turbines. Different from a base-load facility, RockGen is a peaking facility built to operate only when additional power is needed to support the grid. In the Wisconsin region, peak demand for electricity usually occurs during the hottest days in summer, as well as when other plants cease activities for maintenance work, usually in the spring or fall.

The Wisconsin power market is primarily comprised of old, coal-fired power plants. The demands of the Clean Air Act and other environmental issues related to coal-fired generation are forcing suppliers to shift to cleaner energy resources. Calpine’s RockGen facility will provide environmentally responsible energy to help meet Wisconsin’s growing demand for electricity, while providing needed diversification for the state’s fuel mix.

About Calpine

Based in San Jose, Calif., Calpine Corporation is dedicated to providing customers with reliable and competitively priced electricity. Calpine is focused on clean, efficient, natural gas-fired generation and is the world’s largest producer of renewable geothermal energy. Calpine has launched the largest power development program in North America. To date, the company has approximately 34,700 megawatts of base load capacity and 8,200 megawatts of peaking capacity in operation, under construction, pending acquisition and in announced development in 29 states, the UK and Canada. The company was founded in 1984 and is publicly traded on the New York Stock Exchange under the symbol CPN. For more information about Calpine, visit its Website at

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