Mainspring Energy Funding: $800M Raised, Series F (2025)
Mainspring Energy is based in Menlo Park, California. It has raised $800M in total funding. Latest round: Series F.
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.
