PG&E currently has two power purchase agreements with Geysers totaling about 375 megawatts a year, enough renewable energy to meet the needs of more than 450,000 average homes.

Those agreements expire between the end of 2012 and the end of 2014. The new deal would extend the term for Geysers energy through 2021.

Total capacity is expected to increase about 50MW to a total of 425MW from 2010 through 2017, dropping to a total of about 250MW from 2018 through 2021.

Geothermal