Clean Energy Alliance (CEA) has formally signed four exclusive letters of intent with three geothermal developers, marking a major milestone in its mission to deliver reliable, clean energy. The proposed projects will utilize a mix of both traditional and innovative geothermal technologies to diversify CEA’s energy portfolio.
CEA views clean, firm power as a critical component of its strategy to provide 100% renewable energy to customers by 2035. Renewable sources, like solar and wind that rely on the intermittency of the sun shining or the wind blowing, are complemented well by geothermal energy, which taps into the constant, natural heat stored deep in the earth. By harnessing this underground heat, geothermal power plants can provide a uniquely reliable, “always-on” backbone for the clean energy grid.
“In order to power California towards its vital yet ambitious 100% renewable energy future, the need for additional clean, firm renewable resources has never been greater,” says CEA Chief Executive Officer Greg Wade. “The development of geothermal resources will be an essential part of delivering on both the state’s mandates and on our own goal of providing consistent and reliable renewable energy to our customers in the years to come.”
CEA recognizes the importance of early-stage support for geothermal projects in facilitating the investment needed to bring these projects through their preconstruction development process. By entering into these agreements early on, CEA gives developers the backing they need to secure financing, while ensuring CEA locks in access to this 24/7 clean energy.
Moving forward, CEA will work in good faith with developers to strengthen commercial relationships, advocate for continued state and local support of geothermal development in the Western United States, track project development and pursue long-term Power Purchase Agreements as projects mature to a construction-ready stage.
About the Developers
GreenFire Energy, headquartered in Oklahoma City, is a next-generation geothermal developer advancing scalable, carbon-free baseload power projects across the United States. Leveraging next-generation geothermal technology, the company develops reliable energy solutions for utilities, communities, and industries including data centers, defense, and advanced manufacturing that support grid reliability, energy security, and long-term decarbonization.
Under the Geothermal Portfolio Advancement & Commercial Term Sheet (GEOPACT) Letter of Intent, GreenFire Energy is advancing a growing portfolio of geothermal projects across California.
This portfolio includes three sites expected to support the delivery of up to 100 megawatts of reliable, carbon-free baseload power for the Clean Energy Alliance. The broader portfolio reflects GreenFire Energy’s long-term strategy to expand reliable geothermal power generation across California in support of growing regional energy demand.
“California represents a significant long-term opportunity for next-generation geothermal development, and these projects are an important step in expanding GreenFire Energy’s growing portfolio of geothermal offtake opportunities across the state. We’re excited to work with Clean Energy Alliance to help deliver reliable, around-the-clock carbon-free power that supports long-term grid reliability and energy resilience.”
— Cory Draper, Chief Operating Officer, GreenFire Energy
Ignis H2 Energy Inc. is a Houston-based geothermal development platform building a multi basin, multi-country portfolio of high-enthalpy projects across the Western United States, Türkiye, Italy, and Indonesia. Ignis is exploration-first and technology-agnostic — proving the subsurface resource before selecting the development pathway.
Central to Ignis’s development toolkit is its Hybrid Geothermal Solution (HGS) — an integrated approach to optimize overall output by combining hydrothermal, EGS, and AGS technologies within a single development framework, deploying each based on what the reservoir delivers rather than committing to one technology pathway upfront.
The company applies oil and gas discipline and AI-assisted exploration analytics to systematically de-risk geothermal opportunities and convert them into financeable, FID ready assets. Ignis is targeting 1 gigawatt of producible geothermal reserves by 2030. Its team brings 300+ years of combined oil and gas experience and 200+ years of combined geothermal experience across exploration, drilling, reservoir engineering, and project development.
Ignis H2 Energy is advancing the Weepah Hills project in Esmeralda County, Nevada, building on historical subsurface exploration of the Weepah Hills / Alum region with modern geophysical surveys — including magnetotelluric (MT) acquisition and 2-meter temperature surveys — to systematically confirm reservoir presence and reduce subsurface uncertainty ahead of commercial-scale development. Well positions have been picked, and drilling is expected to commence within 60 days, marking the first resource confirmation well in Ignis’s Western U.S. development program.
“Geothermal becomes infrastructure when decisions are driven by converging subsurface evidence, not optimism. CEA’s willingness to engage developers early — when capital is most needed and most valuable — is exactly the kind of partnership that turns prospective resources into delivered megawatts. We’re proud to bring our Western U.S. portfolio to that effort.”
— Richard Calleri, Chief Executive Officer, Ignis H2 Energy
“Geothermal doesn’t scale on optimism. It scales on proven heat, disciplined exploration, and partners willing to engage early. CEA is doing exactly that.”
— Marcus Oesterberg, Chief Operating Officer, Ignis H2 Energy
TLS Geothermics is a next-generation geothermal technology company redefining how the world discovers and develops cost-effective geothermal energy. By integrating advance computational science, machine learning, and systems-based geoscience, TLS identifies high-potential geothermal systems concealed within complex subsurface fault networks. From predictive regional mapping to probabilistic resource assessments, TLS reduces exploration uncertainty and improves the targeting of high-yield geothermal wells with accuracy. Operating across a growing transatlantic portfolio in Europe and the United States, TLS is scaling a repeatable model to unlock reliable firm clean electricity, heating, and cooling from the Earth’s natural heat. Backed by major institutional investors, TLS Geothermics is transforming previously overlooked geothermal resources into foundational assets for the clean energy grid of the future.
“As California accelerates toward its ambitious clean energy goals, the need for reliable, 24/7 clean power has never been more urgent. We are thrilled to partner with Clean Energy Alliance to help meet that need. By combining CEA’s forward-thinking vision with TLS’s geothermal expertise, we can help unlock the Earth’s heat as a source of clean, firm power for California’s evolving grid. This collaboration represents an important step toward a more resilient and fully decarbonized energy future.”
— Mathieu Auxietre, Chief Executive Officer, TLS Geothermics
About Clean Energy Alliance
Clean Energy Alliance (CEA) is a locally controlled, not-for-profit power provider serving over 255,000 customers in the cities of Carlsbad, Del Mar, Escondido, Oceanside, San Marcos, Solana Beach and Vista with a focus on sustainability, competitive rates and community reinvestment. CEA follows a community choice aggregation (CCA) model that allows local governments to purchase power to meet their community’s electricity needs, offering an alternative to investor-owned utilities.