 The injection of wastewater to the Geysers protects local waterways and Clear Lake by diverting effluent which used to be put into surface waters, and has produced electricity without releasing greenhouse gases into the atmosphere.This is a table of all constituent geothermal power stations sorted by unit identification.Calpine owns 19 existing units, most of which were acquired from PG&E and Unocal Geothermal in 1999.