Open Circuit The Green Blueprint: Sage Geosystems' bet on underground energy storage
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Feb 20, 2026 Cindy Taff, CEO of Sage Geosystems and former oil & gas well engineer, explains gravity‑fracture geothermal and underground long‑duration energy storage. She describes pumping pressure deep underground to act like inverted pumped hydro. The discussion covers rapid build of a first commercial facility, a rural cooperative partnership in Texas, and scaling via industry ties like Ormat.
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Pumped Hydro Flipped Underground
- Sage's "upside-down" pumped hydro stores mechanical energy by pressurizing deep engineered fractures instead of lifting water uphill.
- Deeper wells (8,000–12,000 ft) yield higher energy density than the tallest pumped hydro because of greater subsurface pressure.
Rural Coop Became First Commercial Partner
- San Miguel Electric Cooperative toured Sage's field pilot and then leased land for a commercial-scale facility as they scale from coal to solar.
- Sage positioned their facility to pair with future solar tranches to convert daytime solar into longer-duration power.
Parallelize Interconnection Workstreams
- Start grid interconnection and long-lead equipment procurement early and run parallel workstreams to shorten timelines.
- Advocate for parallelized interconnection workflows because linear processes can delay projects by a year.