Mainspring Energy Inc. has secured $258 Million in a Series F financing round to expand its linear generator business. The funding was led by General Catalyst and aims to enhance the company's manufacturing and customer sales capabilities.
Amount Raised
$258 Million
Round Type
Series F
Menlo ParkOtherManufacturingInformation TechnologyEnergyRenewable EnergySolarEnergy StorageInvestors
Description
Mainspring Energy Inc. announced today that it has secured $258 Million in a Series F financing round to expand the company's linear generator power business and operations. The round was led by General Catalyst, joined by several notable investors including Amazon's Climate Pledge Fund and DCVC. The financing will support the company's growth in manufacturing and customer sales
Quick answer
Mainspring Energy raised $258 Million in a Series F round, dated April 14, 2025. Investors: Marunouchi Innovation Partners, M&G Investments, Lightrock, Khosla Ventures, Lgt Bank, Pictet Group, Dcvc and Temasek. Mainspring Energy is based in Menlo Park, California, United States.
- How much did Mainspring Energy raise?
- Mainspring Energy raised $258 Million in a Series F round on April 14, 2025.
- Who invested in Mainspring Energy?
- Marunouchi Innovation Partners, M&G Investments, Lightrock, Khosla Ventures, Lgt Bank, Pictet Group, Dcvc and Temasek are named as investors in this round.
- What does Mainspring Energy do?
- Mainspring designs and manufactures an advanced, flexible power generation solution — the Linear Generator — that gives leading C&I companies, data centers, and utilities reliable, scalable, sustainable power capacity.
- Where is Mainspring Energy based and how big is it?
- Mainspring Energy is based in Menlo Park, California, United States. Fundz records about 478 employees.
- Who are the decision-makers at Mainspring Energy?
- Fundz holds 1 contact at Mainspring Energy, including the Director. Names and contact details are shown to Fundz members.
Source: Fundz verified event record.
Who else raised in Energy and Renewable Energy around the same time
Companies in the same sectors as Mainspring Energy that raised within 45 days of this round, from Fundz verified event records.
- Novac raised $3.8M (Seed) on March 25, 2025.
- Zenergize raised $2M (Seed) on May 19, 2025.
- VFlowTech raised $21M (Funding Round) on May 14, 2025.
- Volt14 raised $1.9M (Pre-Series A) on May 5, 2025.
- Jupiter International raised $58M on April 15, 2025.
- Aetherflux raised $50M (Series A) on April 2, 2025.
Who to call at Mainspring Energy, and when
A new round usually means Mainspring Energy is about to hire and buy. The teams that reach out first get the meeting.
- An alert the day Mainspring Energy raises, hires an executive or expands, scored against what you sell
- The decision-makers there, with verified emails
- Who you already know at Mainspring Energy, from your own LinkedIn network
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