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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.

PRIVATEApr 14, 2025

Amount Raised

$258 Million

Round Type

Series F

Menlo ParkOtherManufacturingInformation TechnologyEnergyRenewable EnergySolarEnergy Storage

Investors

Marunouchi Innovation PartnersM&G InvestmentsLightrockKhosla VenturesLgt BankPictet GroupDcvcTemasekGates FrontierAmazon’s Climate Pledge FundGeneral Catalyst

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

Company Information

Company

Mainspring Energy

Location

3601 Haven Ave

Menlo Park, California, United States

About

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. Any fuel, any scale, anytime, anywhere.

Fundz sees it the moment Mainspring Energy raises, hires an exec or expands, usually minutes after it happens, and tells you who to reach.

Related People

1 contact
Verified contactsGary L., Director hidden hidden hiddenSee plans and pricing
Predictive Intelligence
Strategic

ML-powered predictions for Mainspring Energy's next move

See what Strategic adds

Mainspring Energy raised. Fundz records a round at a median of 3.6 minutes from the SEC filing, with the decision-maker attached.

145 of these a day, filtered to the companies you pick, with the decision-maker attached.

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Fundz is a real-time business intelligence platform powered by agentic AI that proactively delivers personalized daily signals, including funding rounds, executive changes, M&A activity, 13F institutional filings, SEC 8-K events, investor activity, and website modifications, based on each user's watchlist and ICP. A trusted data source at firms such as BlackRock, Oracle, Kleiner Perkins, LinkedIn, HubSpot, and Cloudflare, Fundz democratizes the institutional-grade intelligence that previously required a PitchBook or Bloomberg terminal. Features include FundzWatch™ for automated website change detection, Daily Briefing for AI-powered daily briefings, and unified cross-signal alerts across 281,000+ organizations. Developers and data teams can access these signals programmatically via the Fundz Funding Data API, with transparent published pricing.