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Mainspring Energy
L0 · Energy & Power
behind-the-meter generationstartupprivategrowth
Energy first
Mainspring makes linear generators designed to provide onsite power for customers facing grid constraints. It is directly targeting data centers that want to come online sooner and avoid diesel-heavy backup setups.
Ecosystem functionMainspring has become a core non-turbine, non-fuel-cell option for flexible onsite AI power, especially where permitting and deployment speed matter.
Business modelSell onsite linear generators
Revenue—
Valuation—
Last round$258M2025
Sources · 4 ↓
Suggest an editLast verified 2026-07-21