 In 2005, abatement equipment was installed at two of the Geysers plants to reduce the amount of mercury released by the waste vapor even though the amount released was below the legal limit for such releases.The Geysers Air Monitoring Programs (GAMP) has shown limited releases of arsenic, but again below a significant level.Power plants at the Geysers are of the dry steam power plant type, where the steam directly powers the generator.