Transmission Is Geothermal The Next Evolution In Energy Storage? - Sage Geosystems
Mar 3, 2026
Cindy Taff, CEO of Sage Geosystems and a 35‑year oil and gas veteran now turning subsurface know‑how to next‑gen geothermal and underground energy storage. She explains engineered hot‑rock reservoirs, how pressured fractures can act like underground pumped hydro, and why this approach enables fast, long‑duration, chemistry‑free storage that could scale widely.
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Design Geothermal Storage For Six Plus Hour Durations
- Design geothermal storage for long-duration services rather than competing with lithium-ion at short durations.
- Sage targets >6 hour discharges (~30,000 barrels per cycle, ~3 MW per well) with fast sub-60s dispatch and no cycling degradation.
Shale Learnings Made Hot Dry Rock Feasible
- The shale revolution unlocked technologies transferable to geothermal: directional drilling and hydraulic fracturing enable engineered reservoirs.
- Combined with rising demand for firm carbon-free power and bipartisan policy support, timing favors rapid scale-up.
Storage Economics Can Beat Gas Peakers
- EarthStore storage can undercut gas peakers when gas is ~$5–6/MMBtu and removes fuel-price exposure for capacity.
- Revenue model is tolling agreements with utilities using arbitrage, capacity and ancillary services.