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Calpine

Large energy company in the U.S.

Calpine Corporation was a Fortune 500 company based in Houston, Texas. It was the largest generator of electricity from natural gas and geothermal energy in the United States, with operations in competitive power markets.2 From Wikipedia, CC BY-SA 4.0

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Last updated Oct 16, 2026.

Overview

1984Founded1

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Calpine building houston tx-looking up
Photo: Safety Cap, CC BY 3.0, via Wikimedia Commons3

Calpine Corporation was a Fortune 500 company based in Houston, Texas. It was the largest generator of electricity from natural gas and geothermal energy in the United States, with operations in competitive power markets.2

How it started

1984–1999

In 1984, Calpine was founded in Silicon Valley, California. Peter Cartwright and four of his co-workers, the Guy F. Atkinson Construction Company of South San Francisco, and the Electrowatt Corporation struck an investment arrangement. With initial capital of US$1 million, it was essentially a Silicon Valley startup company. In 1988, the first QF cogeneration plant was commissioned and power production began.

The name "Calpine" is derived from the company's original California location and alpine, a reference to the Zürich home base of Electrowatt. Electrowatt provided essential assistance when Calpine was a startup.

In 1988, the first QF cogeneration plant was commissioned and power production began. In 1992, the company's assets reached US$21 billion. In 1994, the company reached capacity output of 141 MegaWatts. In 1996, the company's initial public offering was the largest for an independent energy company.

In 1999, Calpine bought PG&E's holdings at The Geysers, acquiring most of the geothermal complex. The Houston-based company operates 15 plants and produces about 725 megawatts.

2000–2020

From Wikipedia’s article on Calpine, shared under CC BY-SA 4.0.2

Timeline

  1. 1984Founded Founded1

Sources

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