Mainspring

Menlo Park, CA · Founded 2010 · Privately Held (backing)

Manufacturer of linear power generators intended to bring affordable, reliable, and net-zero carbon grids of the future. Mainspring is based in Menlo Park, CA and was founded in 2010. Its last reported valuation was $1.9 billion in Apr 2025. It has raised $849 million.

Last reported valuation

$1.9B

Oct 2026

Priced at

—

Total raised

$849.5M

Last round

—

How much has Mainspring raised?

$849.5Macross 0 recorded rounds

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Mainspring investors

37 investors are on record for Mainspring, including Alumni Ventures, General Catalyst, Khosla Ventures and U.S. Department of Energy. By type, the record holds 7 venture capital firms and 4 family offices.

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Frequently asked about Mainspring

How much has Mainspring raised?: Mainspring has raised $849.5M in total across 0 recorded funding rounds.