The Pacific Gas and Electric Company (PGandE) has been generating power from geothermal steam at The Geysers since 1960. The Geysers Power Plant in Sonoma and Lake counties is about 90 miles north of San Francisco. It is the only electric power project in the United States using geothermal steam. Table 1 shows the expansion year by year. The Geysers plant became the world's largest geothermal power plant in 1973.

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