Public company, workplace, funding, and market signals
Updated Aug 5, 2026
Mainspring Energy is a privately held power-infrastructure company that designs, manufactures, and deploys firm, flexible, fuel-flexible local power for utilities, data centers, commercial/industrial users, EV charging, and microgrids. Commercial shipments began in 2020; the company reports hundreds of megawatts in field operations and advanced development.
Primary product
Mainspring Linear Generator: a modular, dispatchable, flameless linear-generation system that converts gaseous fuels directly into electricity. It supports natural gas, biogas/RNG, propane, field gas, and hydrogen; operates at approximately 46% efficiency, delivers near-zero NOx emissions without aftertreatment, ramps quickly, and can operate independently of or in parallel with the grid.
Founded
2010
Headquarters
Menlo Park, California, United States
Team size
Approximately 400–500 employees (third-party estimate; official headcount unavailable)
Work style
Flexible
Industry
Electric power generation / energy infrastructure
Sub-industry
Distributed energy, onsite generation, clean energy hardware, and microgrids
Offices
Business model
Stage
Late-stage private / Series F
Total raised
$813M
Latest round
Series F · Apr 2025
Latest amount
$258M
Apr 2025 · General Catalyst
U.S. Department of Energy manufacturing grant
Oct 2024 · U.S. Department of Energy
Sep 2022 · Lightrock
May 2021 · Devonshire Investors
Leadership
Chairman and Chief Executive Officer
President and Founder; previously founding CEO
Chief Commercial Officer and Founder
Ryan Fletcher
Chief Financial Officer
Scott Gebicke
Chief Operating Officer
Senior Vice President, Engineering
Founders
Matt Svrcek
Co-founder; former CTO
Investors
The company emphasizes ambition, practical problem solving, technical rigor, humility, inclusion, cross-functional teamwork, and hands-on ownership. Careers materials describe a supportive environment in which employees solve difficult engineering and operational problems side by side.
Work style
Flexible
Compensation
Job postings signal location- and experience-adjusted base salary, pre-IPO stock options, and benefits. At least one posting states that offers generally are not negotiated; public evidence does not support a complete compensation benchmark.
Benefits
Pricing
No public list pricing found; project-specific equipment and deployment pricing, with optional or contracted maintenance/service offerings. A reported customer economics signal describes a potential approximately three-year payback versus traditional alternatives in some applications.
Differentiators
Technology
Customers
Competitors
Estimated revenue
Approximately $100M–$150M annually (third-party estimate; not company-reported)
The U.S. Department of Energy selected Mainspring for an $87 million manufacturing grant. The planned Pennsylvania facility represented more than $175 million of total investment and a stated future workforce of more than 600; execution, construction, and ramp-up therefore represent material delivery and capital-scaling dependencies.
SourcePR Newswire / Mainspring Energy · Jun 2026
Tom Linebarger became CEO and Shannon Miller transitioned to President as Mainspring targets growth in utility and AI-data-center power markets.
Mainspring Energy · Apr 2025
General Catalyst led a $258 million Series F; the company said cumulative financing exceeded $800 million.
Mainspring Energy · Oct 2024
The grant supports a large Pennsylvania manufacturing facility intended to produce up to 1,000 linear generators annually.
Mainspring Energy · Sep 2022
Lightrock led the final close of Series E, expanded from an initial $150 million close to $290 million.
77 jobs at Mainspring Energy