Carlo Cariaga
Jul 23, 2025
Startup geothermal developer 400C Energy has announced the successful completion of a demonstration of its proprietary superhot-capable hydraulic fracturing technologies in a >300 °C enhanced geothermal well. This rigorous field demonstration advances the 400C Energy stimulation Technology Readiness Level (TRL) from 7 to 8, marking a significant leap forward in the economic development of high-temperature and superhot enhanced geothermal systems (EGS).
The company had previously acquired an existing well in Utah, near the FORGE project, to demonstrate its superhot-capable stimulation technology.
“This achievement underscores 400C Energy’s commitment to pushing the boundaries for reliable, firm power,” said Blake Wood, CEO of 400C Energy. “Our superhot-capable hydraulic fracturing and production technologies are poised to make EGS the most economic reliable, firm resource for 24/7 power generation. Reaching TRL 8 is a testament to our innovation and vision for an abundant energy future.”
Advancing EGS for firm, 24/7 power generation requires new technologies capable of delivering competitive levelized costs of 40–60 USD/MWh. In a recent Nature article, Aljubran and Horne (2024) showed that reaching this economic target requires to operate at conditions exceeding 300°C, sustain high production flow rates over 125 kg/s, and ensure thermal longevity of 15 years or more.
400C Energy provides superhot-capable, high-stage-count stimulation technologies with integrated flow control devices specifically designed to meet these demanding performance metrics and unlock the full potential of EGS. 400C Energy’s technologies enables 2-3x power generation per well pair compared to current EGS designs at <250°C, yielding improved economics with fewer drilled wells and minimal environmental impact. By achieving TRL 8, the company is now positioned to accelerate the transition to widespread adoption, targeting levelized electricity costs of $45-55 per MWh and contributing to global decarbonization efforts.