Insights

Strategic finance Capital infusion and a substantial Series G financing round indicate strong investor confidence and growth capital. This suggests potential for upsell opportunities in large-scale energy projects and enhanced funding availability for strategic deployments.

Large-scale deals Significant capacity deals with major utilities like American Electric Power (up to 1.6 GW, potentially $4B over eight years) highlight a proven capability to scale. Target similarly situated utilities and large industrial customers seeking flexible, low-emission generation at scale.

Manufacturing expansion New manufacturing centers in Pennsylvania with initial employment and multi-million investment signal capacity expansion. This creates opportunities to engage regional OEMs, local suppliers, and grid modernization projects in the northeastern corridor.

Leadership momentum Leadership transition to experienced industry figures, including a former Cummins chair and CEO as CEO and the founder as president, aligns with aggressive growth into AI data center and utility markets. Leverage credibility to approach data centers and utilities prioritizing reliability and innovation.

Technology edge Diverse tech stack and emphasis on flexible, low-emission generation position Mainspring as a compelling partner for customers pursuing decarbonization and resilience. Position the solution for data centers, utilities, and industrial users seeking cleaner, adaptable standby and peak power resources.

Similar companies to Mainspring Energy

Mainspring Energy Tech Stack

Mainspring Energy uses 8 technology products and services including SOLIDWORKS, WordPress, GitLab CI, and more. Explore Mainspring Energy's tech stack below.

Media & News

Mainspring Energy's Email Address Formats

Mainspring Energy uses at least 4 email formats:
Mainspring Energy Email FormatsExamplePercentage
First.Last@mainspringenergy.comJohn.Doe@mainspringenergy.com
97%
Last@mainspringenergy.comDoe@mainspringenergy.com
2%
First@mainspringenergy.comJohn@mainspringenergy.com
1%
First.Last@etagen.comJohn.Doe@etagen.com
100%

Frequently Asked Questions

What is Mainspring Energy's phone number?

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You can contact Mainspring Energy's main corporate office by phone at . For more prospecting data, LeadIQ has access to up-to-date and accurate contact information within our platform. Find, capture, and sync contact data to your CRM and sales tools in one click.

What is Mainspring Energy's official website and social media links?

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Mainspring Energy's official website is mainspringenergy.com and has social profiles on LinkedIn and Crunchbase.

How much revenue does Mainspring Energy generate?

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As of October 2026, Mainspring Energy's annual revenue is estimated to be $100M - $250M.

What is Mainspring Energy's NAICS code?

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Mainspring Energy's NAICS code is 22111 - Electric Power Generation.

How many employees does Mainspring Energy have currently?

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As of October 2026, Mainspring Energy has approximately 522 employees across 4 continents, including North America, Asia and Europe. Key team members include Vice President Engineering: D. U., Head Of Brand Marketing: T. R. and Head Of Project Delivery: B. H. Explore Mainspring Energy's employee directory with LeadIQ.

What industry does Mainspring Energy belong to?

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Mainspring Energy operates in the Electric Power Generation industry.

What technology does Mainspring Energy use?

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Mainspring Energy's tech stack includes SOLIDWORKS, WordPress, GitLab CI, OpenAI, Asana, Airtable, Smartsheet and 1Password.

What is Mainspring Energy's email format?

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Mainspring Energy's email format typically follows the pattern of First.Last@mainspringenergy.com. Find more Mainspring Energy email formats with LeadIQ.

How much funding has Mainspring Energy raised to date?

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As of October 2026, Mainspring Energy has raised $813M in funding. The last funding round occurred on May 14, 2025 for $258M.

When was Mainspring Energy founded?

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Mainspring Energy was founded in 2010.
Mainspring Energy logo

Mainspring Energy

Electric Power GenerationCalifornia, United States501-1000 Employees

Mainspring Energy is a power generation company based in Menlo Park, California, that designs and manufactures linear generators for local power delivery to capacity-constrained facilities and communities. Its products are used by utilities, data centers, enterprise customers, and industrial sectors. The company employs between 501 and 1,000 people and is headquartered at 3601 Haven Avenue, Menlo Park, CA 94025. In 2025 it expanded its manufacturing footprint with a 300,000-square-foot facility investment in Pittsburgh, Pennsylvania. Also in 2025, Mainspring Energy completed a Series F financing round led by General Catalyst.

Section iconCompany Overview

Phone number
NAICS Code
22111 - Electric Power Generation
Founded
2010
Employees
501-1000

Section iconFunding & Financials

  • $813M

    Mainspring Energy has raised a total of $813M of funding over 8 rounds. Their latest funding round was raised on May 14, 2025 in the amount of $258M as a Series F.

  • $100M - $250M

    Mainspring Energy's revenue is estimated to be in the range of $100M - $250M

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