From Renewable Energy Journal...
"Calpine has been in bankruptcy reorganization for some time and has steadily been divesting assets over the past 18 months.""It is widely rumored that the Carlyle Group and AES have bid to buy Calpine and its $26B in assets. A key asset Calpine holds is the Geysers geothermal power plant complex in Northern California of which Calpine owns 20 of the 22 plants producing around 700MW, or 5.5 gigawatt hours of electricity, enough to power San Francisco each year."