Calpine Corporation this week marked the 65th anniversary of The Geysers, one of the world's largest and most productive geothermal energy sites.
The milestone reflects more than six decades of innovation, partnership and sustainable power generation in Northern California, the company said in a media release.
Calpine Corporation is America's largest generator of electricity from natural gas and geothermal resources with operations in competitive power markets.
Since commercial operations began in 1960, The Geysers has been at the forefront of California's energy transformation, producing reliable, around-the-clock renewable power using steam heated by the Earth's core.
Today, Calpine's 13 geothermal power plants across the 45-square-mile terrain generate enough renewable electricity to power approximately 725,000 homes annually.
“The success of The Geysers over the past 65 years is a testament to the people who have cared for it: hardworking, committed individuals who view stewardship as both a duty and a privilege,” said Aimee Blaine, Calpine's Senior Vice President, Geothermal Region.
Calpine has nearly 300 employees and 150 contractors who live and work in Lake and Sonoma Counties, who have helped make The Geysers a “global model for responsible geothermal development” and a cornerstone of California's renewable energy portfolio, the company stated.
“Together with our partners and community, we have built a deep connection to each other and this land,” said Blaine.
“Our shared pride in this work has helped The Geysers remain a global leader in geothermal energy production and environmental responsibility."
To commemorate the milestone, Calpine donated US$65,000 to the Clear Lake Environmental Research Centre (CLERC), a community-based non-profit focused on protecting and restoring the Clear Lake watershed and surrounding ecosystems.
Working across Lake and Sonoma Counties, CLERC coordinates wildfire prevention and habitat restoration efforts.It also brings together science, education and collaboration with local partners and tribes to build a more resilient and sustainable future for Northern California.
California State Senate President pro Tempore Mike McGuire called The Geysers a genuine feat of engineering and dedication.
“And Calpine's commitment to expanding renewable energy while protecting our natural resources is proof that innovation and sustainability are perfect partners in the world's fourth-largest economy.”
He added: “65 years is an incredible milestone for geothermal energy here in Lake and Sonoma counties, and we all look forward to what's ahead as the iconic Geysers continue to help shape California's transition to clean energy for the next generation.”
Geothermal energy in North America is undergoing a transformative moment.
Turboden America LLC., a subsidiary of Turboden S.p.A, part of the Mitsubishi Heavy Industries Group, has announced the award of Phase II of the landmark Cape Station geothermal project in Utah, USA.
North America is helping to drive momentum in the global geothermal sector, with the region seeing increased activity relative to other parts of the globe in recent times.
While the number of next-generation geothermal project announcements plateaued elsewhere, North America continued to increase its global share – acting as a key driver of pipeline expansion, according to a recent Wood Mackenzie report.
A total of 260 MW of new Advanced Geothermal Systems (AGS) power capacity was announced in the the USA during Q2 2025, raising un-risked AGS capacity to 20% of the overall US project pipeline — up from just 2% in the same period last year, the report noted.
Next-generation geothermal technologies, especially, are creating a new buzz of excitement around the sector, it noted.
Moreover, the growth of the data centre industry, and collaborations with geothermal energy partners, continue to boost and strengthen the next-gen project pipeline.
AGS comprises a closed-loop system that circulates fluid through the subsurface while avoiding direct contact with rock or groundwater. Unlike conventional geothermal, it can be used almost anywhere.
Other next-gen technologies include enhanced geothermal systems (EGS), whereby fluid is injected into hot rocks to increase permeability; Geopressured Geothermal Systems (GGS), which extract energy from high-pressure, high-temperature reservoirs of water containing dissolved methane; and superhot rock, which involves harnessing geothermal energy from extremely hot, dry rocks found deep underground.
According to Wood Mackenzie, US policy momentum and funding is also accelerating.
“The US government’s backing for direct lithium extraction (DLE) project ATLiS, with its co-located geothermal project, accounted for most public funding of geothermal in North America in Q1 – and a significant proportion of global funding,” the energy consultancy noted in an opinion piece.
Taking AtLiS out of the equation, total public funding for geothermal globally increased by 57% between Q1 and Q2 2025, to hit US$400mn – helped by strategic reforms, incentives and international alliances, it added.
The focus was on core geothermal projects covering conventional and next-generation technologies.
Investor confidence also remains strong, Wood Mackenzie added, with next-generation startups including Fervo, XGS, Eavor and Green Therma raising a total of US$319mn during Q2.
That sum represents 14% of all money invested in next-gen geothermal since 2019, and brings the total amount secured between 2019 and 2025 to a healthy US$2.2bn.
XGS Energy has announced the successful operation of its proprietary water-independent technology system at commercial scale for more than 3,000 hours, becoming the first company to achieve this milestone.
Rodatherm Energy Corporation, a geothermal start-up, has successfully raised US$38mn in a Series A funding round.
The US’ Bureau of Land Management (BLM) has accepted winning bids on nine parcels of land in Idaho covering nearly 24,355 acres, in a geothermal lease sale that has netted US$4.4mn in total receipts.
Dig Energy, a New Hampshire-based startup, has raised US$5mn in venture funding to bring its compact geothermal drilling technology into pilot deployment.
Baker Hughes and Controlled Thermal Resources have entered into a definitive agreement for the development of up to 500MW of baseload geothermal power at the Hell’s Kitchen site in California.
The Bureau of Land Management (BLM) has announced it will host a competitive geothermal lease sale on October 21, 2025, featuring 113 parcels that cover a combined 377,678 acres across multiple Nevada counties, including Churchill, Esmeralda, Elko, Eureka, Humboldt, Lander, Lyon, Mineral, Nye, Pershing, and Washoe.
The St. Kitts and Nevis geothermal power project is inching forwards as some of the industry’s top names compete to take part in drilling work, which is set to commence next year.
The 30-megawatt geothermal plant, once operational, is expected to provide baseload renewable energy for both Nevis and St. Kitts, delivering cleaner, more affordable electricity and advancing the Federation’s goal of true energy independence.
The Organisation of Eastern Caribbean States Commission (OECS) confirmed recently another major milestone in the journey with the official opening of bids for the production drilling phase.
A total of five bids from internationally recognised firms were received for the initiative on Nevis, including from some well-known industry players.
The five companies that submitted bids are:
Iceland Drilling Company (Iceland)
Marriott Drilling (UK)
Consortium Drilling (UK)
Ormat Technologies Inc. (USA)
IPS-USA (USA)
Drilling to produce geothermal energy to drive an electric turbine at Hamilton Estate is expected to begin in early 2026 following the awarding of the contract to the successful bidder, the OECS reported.
The strategic energy project has received international funding from a variety of lenders and donors including the Caribbean Development Bank, the Inter-American Development Bank, and the Saudi Fund for Development, reflecting its significance for the country and the whole region.
St. Kitts and Nevis will become the third OECS member state to develop a geothermal power plant, following Dominica’s planned inauguration of a 10-megawatt plant in the Roseau Valley at Christmas 2025.
Guadeloupe has been producing about 5% of its electricity from geothermal sources since 1986.
Baker Hughes, a global energy technology company, has secured an award from Fervo Energy Company, a pioneer in next-generation geothermal energy, to design and supply equipment for five Organic Rankine Cycle (ORC) power plants at Fervo’s Cape Station project near Milford, Utah, United States.