Mainspring Energy
Latest round
- Series F
Last raised
- Apr 2025
Total raised
- $656M
Investors
- 30
About Mainspring Energy
, operates as a provider of linear generators for commercial businesses. Shannon Miller is the Founder and current CEO of the company. In April 2025, Mainspring Energy, Inc. The company produces a Mainspring Linear generator that delivers onsite power that increases resiliency and accelerates the transition to renewable fuels. The company product delivers fully dispatchable, fuel-flexible, near-zero NOx emissions, high efficiency, low capital & maintenance costs, and turn-key packaging. The Mainspring linear generators are used for commercial and industrial applications, grid infrastructure, and Microgrids. The company generates revenue by providing 2 purchase options for its users: Direct purchase and Energy services agreement. Direct purchase of linear generator option is for users looking to maximize cost savings and return on investment whereas Energy Services Agreement is for users where they can realize immediate cost savings, with no upfront costs, by only paying for electricity produced over the term of the agreement.
Who invested in Mainspring Energy
30 investors across 7 rounds
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Funding rounds
Series F
Apr 14, 2025
Amount
$258M
Investors
Series E
Sep 21, 2022
Amount
$140M
Investors
Series E
May 24, 2022
Amount
$150M
Investors
Series D
Dec 16, 2020
Amount
$108M
Investors
Series C
Jan 25, 2018
Amount
Undisclosed
Investors
Series C
Aug 29, 2017
Amount
Undisclosed
Investors
Seed
Jan 1, 2010
Amount
Undisclosed
Investors
Questions about Mainspring Energy
Who invested in Mainspring Energy?
Mainspring Energy has 30 investors on record across 7 venture rounds. Sign up free to see every VC on the cap table and the rounds they joined.
How much funding has Mainspring Energy raised?
Mainspring Energy has raised 7 venture rounds. Sign up free to see how much each round raised and the total.
When did Mainspring Energy last raise money?
Mainspring Energy's most recent round on record is a Series F, in Apr 2025.
What does Mainspring Energy do?
, operates as a provider of linear generators for commercial businesses.
Where is Mainspring Energy headquartered?
Mainspring Energy is headquartered in Menlo Park, US.
Which VCs invest in companies like Mainspring Energy?
Among active investors with capital left to deploy, Andreessen Horowitz, Founders Fund, Accel and Thrive Capital back power & utilities companies at Mainspring Energy's stage. Their profiles are linked below.
VCs backing power & utilities startups at Series F
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