Company
mainspringenergy.com
Delivering power on your timeline.
Also known as Mainspring Energy, Mainspring Energy, Inc.
- Status
- Operatingas of 2026-09-17
- Business model
- B2B
- Headquarters
- Menlo Park, United States
- Customers
- other companies
- Legal name
- Mainspring Energy, Inc.
- mainspringenergy.com (opens in a new tab)
- LinkedIn (opens in a new tab)
- Press page (opens in a new tab)
- Careers (opens in a new tab)
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Record updated 28 September 2026
About
Mainspring delivers firm, flexible power when and where you need it.
Funding snapshot
- Total raised
- $191MSEC form D sum, as of 2026-09-28Source (opens in a new tab)
- Latest round
- Round, $108M2020-12-16
Funding rounds
- Round, 2020
- $108M2020-12-16, SEC form D sold, 19 investors
- Round, 2017
- $83.3M2017-08-29, SEC form D sold, 12 investors
Products
- Hardware
- Mainspring Linear Generator
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