Mainspring Energy
Menlo Park, United States · Energy, Energy Storage, Information Technology
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.
Key facts
- Headquarters
- Menlo Park, United States
- Employees
- 478
- Industries
- Energy, Energy Storage, Information Technology
- Status
- Private
- Website
- dlcctampa.com
- Company page
Recent activity at Mainspring Energy
- : Mainspring Energy Appoints Tom Linebarger as Chief Executive Officer
- : 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.
- : Mainspring Energy Expands Channel Sales Network with New Resellers to Accelerate Adoption of Linear Generators.
- : Mainspring Closes Series E At $290 Million
- : Nuance Pharma Acquires Sino Health To Further Strengthen Its Commercial Capabilities And Expand Pipelines
- : Pinnacle Asset Management-Backed Viserion Grain Completes Acquisition Of Grain Elevator Facilities
- : Mainspring Energy, Inc.
- : DLCC, LLC
- : DLCC, LLC
- : DLCC, LLC
Mainspring Energy funding history
| Date | Round | Amount |
|---|---|---|
| Apr 2025 | Series F | $258.0M |
| Sep 2022 | Series E | Undisclosed |
| Jul 2021 | Venture | $108.1M |
| Apr 2021 | Seed | $320K |
| Jan 2020 | Pre-Seed | $75K |
Leadership
- James Runnels, Director
- Jeanine Hightower-Sellitto, Director
- David Luci, Director
- Matthew Baldassano, Director
- James Runnels, Executive Officer, Director
- Jeanine Hightower-Sellitto, Director
- David Luci, Director
- Matthew Baldassano, Director
- Gary Larsen, Director
- James Runnels, Executive Officer, Director
- Jeanine Hightower-Sellitto, Executive Officer, Director
- David Luci, Director
Verified email and direct lines for Mainspring Energy’s decision-makers are on Fundz. See plans — or book a 15-minute walkthrough.
Employee benefit plans
Mainspring Energy files 2 employee benefit plans with the U.S. Department of Labor, including a retirement plan. The next plan year renews in Dec 2026.
Companies similar to Mainspring Energy
- Amprius Technologies · Energy, Energy Storage, Information Technology, Manufacturing, Renewable Energy, Solar
- Ascent Solar Technologies · Energy, Information Technology, Manufacturing, Other, Renewable Energy, Solar
- Energy Vault · Energy, Energy Storage, Manufacturing, Renewable Energy, Solar
- Exro Technologies · Energy, Energy Storage, Manufacturing, Other, Renewable Energy
- Dragonfly Energy Holdings Corp · Energy, Energy Storage, Manufacturing, Renewable Energy, Solar
About Mainspring Energy: questions and answers
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. Any fuel, any scale, anytime, anywhere.
Where is Mainspring Energy headquartered?
Mainspring Energy is headquartered in Menlo Park, United States.
How many employees does Mainspring Energy have?
Mainspring Energy has about 478 employees.
Has Mainspring Energy raised funding?
Yes. Fundz has recorded 5 funding events for Mainspring Energy. The most recent, Series F of $258.0M, was in Apr 2025.
What is the latest news on Mainspring Energy?
On Jun 10, 2026, Mainspring Energy Appoints Tom Linebarger as Chief Executive Officer
Source: Fundz records from SEC filings, press releases and company announcements. How Fundz measures data accuracy