en.Wedoany.com Reported - On June 8, U.S. Calpine announced the completion of a 25-megawatt expansion at The Geysers geothermal complex in Sonoma County, California. Calpine is now a business unit under Constellation, and this expanded capacity will further enhance the local supply of continuous renewable electricity while supporting the reliability of California's power grid.
Located in Northern California, The Geysers geothermal complex is one of the largest operating geothermal complexes in the world, generating electricity from underground natural steam resources and has been providing geothermal power to California for over 65 years. The addition of 25 megawatts is part of Calpine's ongoing investment in this geothermal asset in recent years, following the completion of a 38-megawatt energy storage system at the same site in 2024. According to the company's disclosure, the new expansion capacity can provide equivalent electricity for over 25,000 households annually. Of this, 18 megawatts will be supplied to Clean Power Alliance, serving communities in Los Angeles County and Ventura County in Southern California; the remaining 7 megawatts were already connected to the grid and put into operation last year, supplying power to MCE to support the electricity needs of residents and businesses in the San Francisco Bay Area.
The engineering value of geothermal power lies in its continuity and stability. Compared to wind and solar power, geothermal power generation is not directly affected by weather and diurnal variations, allowing it to serve as a cleaner power source closer to baseload in the electricity system. In recent years, California has been advancing the replacement of renewable energy while facing challenges such as rising high-temperature loads, increased demand from data centers and electrification, extreme weather disruptions, and evening peak power supply pressures. Although the expansion capacity of The Geysers project is not an ultra-large new installation, it taps into the potential of existing assets within a mature geothermal resource area. By optimizing steam resource utilization, updating pipeline systems, integrating units, and improving long-term operations and maintenance, it adds a portion of clean power that can be dispatched around the clock. For the geothermal industry chain, such projects will continue to drive demand in segments such as drilling services, steam pipeline networks, surface power plant equipment, corrosion control, operations and maintenance monitoring, energy storage coordination, and grid integration.
The construction phase of the project was completed in collaboration with local unions through a project labor agreement, focusing on the implementation of pipeline infrastructure construction. Clean Power Alliance and MCE, as local power purchasers, will incorporate the relevant electricity into their respective clean energy supply portfolios. With the new capacity entering operation, The Geysers geothermal complex will continue to function as a stable clean power node in California's energy structure, also providing a new case study for extending asset value through expansion, energy storage integration, and contracted power supply at mature geothermal fields.
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