California Geothermal Plant Powers 25,000 More Homes

Deep beneath California's rolling hills, natural steam has powered homes for 65 years, and now it's reaching even more people.

The Geysers geothermal complex in Sonoma County just completed a 25-megawatt expansion, bringing round-the-clock renewable energy to 25,000 more households. Unlike solar panels that sleep at night or wind turbines that wait for breezes, geothermal plants tap into Earth's constant underground heat to generate electricity every single hour of every day.

"As California's electricity demand continues to grow, investments in reliable, around-the-clock renewable energy are more important than ever," said Aimee Blaine, senior vice president of Calpine's geothermal region. The expansion builds on momentum from 2024, when the site added a 38-megawatt energy storage system.

Most of the new capacity (18 megawatts) flows to Clean Power Alliance, serving Southern California customers. The remaining 7 megawatts already powers Bay Area homes and businesses through MCE. Both regions now enjoy electricity that doesn't depend on sunny skies or steady winds.

The project created jobs under a labor agreement with local unions, ensuring skilled workers built the critical piping infrastructure under strong labor standards. Workers laid new pipes to capture more of the natural steam reserving sitting beneath the surface, waiting to be tapped.

The Ripple Effect

The Geysers represents something bigger than one facility getting stronger. As the world's largest operating geothermal complex, it proves that baseload renewable energy can work at massive scale. While batteries store energy and solar captures daylight, geothermal just keeps running.

California's grid needs this reliability as electric vehicles multiply and more homes switch from gas to electric heating. Clean energy that works at 3 a.m. on a cloudy, windless night becomes essential infrastructure, not just a nice addition.

The expansion strengthens grid stability across the state while cutting carbon emissions. Clean Power Alliance customers get dependable electricity that doesn't flicker when weather changes. Bay Area residents powered by MCE enjoy the same constant supply.

For over six decades, The Geysers has tapped into something simple: Earth itself generates tremendous heat, and we can harness it without burning anything. The 25-megawatt boost proves this 65-year-old technology still has room to grow, powering California's clean energy future one home at a time.