Eavor Sonoma

Executive Overview

Eavor Sonoma is a closed-loop geothermal project under development in Sonoma and Mendocino Counties, California, developed by Eavor Technologies in partnership with Sonoma Clean Power (SCP). The project is structured as a demonstration at 20 MW, with a contractual pathway to scale to 200 MW, and forms part of SCP's Geothermal Opportunity Zone (GeoZone) initiative alongside agreements with Cyrq Energy and Chevron New Energies. In March 2023, SCP's Board approved three GeoZone cooperation agreements, of which Eavor is one. As of June 2025, Eavor had not yet satisfied its obligation to obtain site control for a pilot project — a key milestone under the original cooperation agreement — and the agreement was being amended to extend timelines. California permitting delays, particularly the multi-year backlog at CalGEM, have been a structural constraint across the GeoZone programme; AB 1359 (signed October 2024) and AB 531 (signed 2025) have since transferred lead permitting authority to county planning departments, which may accelerate exploratory well applications.

How It Works & Differentiation

Eavor's Eavor-Loop technology uses a sealed, closed-loop system that circulates a working fluid through deeply drilled wells in a radiator-like configuration, extracting geothermal heat without hydraulic fracturing, water injection, or reliance on naturally occurring hydrothermal resources. Because the system is fully closed, it eliminates the seismicity risks and water consumption associated with conventional geothermal and EGS. This distinguishes it from open-loop EGS approaches and conventional hydrothermal plants, enabling deployment in a broader range of geological settings. The technology has now been demonstrated at commercial scale at Geretsried, Germany, which began delivering power to the grid in December 2025, providing the first real-world operating reference for closed-loop geothermal at utility scale.

Commercialization & Traction

SCP has a cooperation agreement with Eavor providing a pathway to long-term offtake. The 20 MW demonstration structure is designed to validate the technology at commercial scale in California before committing to the full 200 MW build-out. The Geretsried operating reference strengthens Eavor's commercial position; SCP has stated that Eavor's technology continues to offer desirable characteristics for the GeoZone and remains strategically interested in the partnership. However, site control and permitting remain unresolved as of mid-2025, and no construction start date or FID has been announced.

Scalability & Strategic Context

The GeoZone framework provides Eavor with a structured development pathway and a committed potential offtaker in California, reducing market risk during the demonstration phase. Success at Sonoma would position Eavor-Loop as a viable baseload option for California's clean energy transition, where firm, dispatchable renewable capacity is increasingly scarce. The state's 2,000 MW geothermal procurement order and CPUC targets for up to 4 GW of geothermal by 2035 create structural demand. The COD of 2030 is increasingly tight given the lack of site control as of mid-2025; early 2030s is a more realistic expectation absent a permitting breakthrough.