Who has invested in Mainspring Energy?

General Catalyst, Khosla Ventures, Gates Frontier Fund, Lightrock, Princeville Capital, ClearSky are named among the investors backing Mainspring Energy.

Mainspring Energy Funding: $800M Raised, Series F (2025)

Mainspring Energy funding overview

Mainspring Energy is based in Menlo Park, California. Mainspring Energy has raised $800M in total disclosed funding. That places its disclosed total in the $250M–$1B range. Its most recent disclosed round is a Series F announced in January 2025. The round record for Mainspring Energy runs through 2025; nothing later has been disclosed. Investors on record include General Catalyst, Khosla Ventures, Gates Frontier Fund, Lightrock, Princeville Capital, ClearSky and 6 others. 12 distinct backers are named across the disclosed rounds.

Mainspring Energy at a glance

Total raised: $800M
Latest round: Series F
Latest round date: January 2025
Headquarters: Menlo Park, California
Notable investors: General Catalyst, Khosla Ventures, Gates Frontier Fund, Lightrock, Princeville Capital, ClearSky, Amazon Climate Pledge, NextEra Energy

Frequently asked about Mainspring Energy funding

How much has Mainspring Energy raised?: Mainspring Energy has raised $800M in total disclosed funding across the rounds on record.
Who has invested in Mainspring Energy?: General Catalyst, Khosla Ventures, Gates Frontier Fund, Lightrock, Princeville Capital, ClearSky are named among the investors backing Mainspring Energy.
What was the latest Mainspring Energy funding round?: The most recent disclosed round is a Series F, announced in January 2025.
Where is Mainspring Energy based?: Mainspring Energy is based in Menlo Park, California.
When did Mainspring Energy last raise?: The last disclosed Mainspring Energy round closed in January 2025 at Series F.

Mainspring Energy totals reflect disclosed capital only — undisclosed extensions and secondaries are excluded. Use the related companies in Menlo Park below to benchmark round size and investor mix.

Mainspring Energy Funding: $800M Raised, Series F (2025)

Mainspring Energy funding overview

Mainspring Energy at a glance

Frequently asked about Mainspring Energy funding

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