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Mainspring Energy
United States - Menlo Park, CA
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1 Disclosed Funding Rounds $258,000,000
0 Participating Investments
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Founded date
2010
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Operating Status
Active
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Last Funding Type
Seed
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Company Type
For Profit
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Mainspring designs and manufactures an advanced, flexible power generation solution — the Linear Generator — that gives leading C&I companies, data centers, and utilities reliable, scalable,
| Date | Round | Raised | Participating Investors |
|---|---|---|---|
| April, 16 ,2025 | Series F | $258,000,000 |
M&G Investments
Lightrock
DCVC Bio
Pictet Group
Green Gravity
enspired
Sweetch Energy
Helion
CNR (Compagnie Nationale du Rhône)
Govstream.ai | $3,600,000 | (Dec 5, 2025)
ZincFive, Inc. | $30,000,000 | (Dec 5, 2025)
imper.ai | $28,000,000 | (Dec 5, 2025)
SPhotonix Inc | $4,500,000 | (Dec 5, 2025)
Multifactor (YC F25) | $15,000,000 | (Dec 5, 2025)
