Mainspring Energy
PrivateLast Round
Series F
Apr 14, 2025
Total Funding Raised
$813M
Company Overview
Mainspring Energy is a clean energy company that manufactures and delivers fuel-flexible linear generators designed to provide affordable, reliable, and net-zero carbon electricity.
Sector
Energy & Sustainability
Verticals
Energy Management, Renewable Energy
Business Model
B2B
Customer Profile
Hardware Sales, Hardware + Subscription, Services & Consulting
AI Layer
Non-AI
Keywords
Historical Pricing
Historical view of private secondary pricing and transaction trends.
Mainspring Energy Comparables
Compare Mainspring Energy with similar companies based on industry and business-model similarity.
| Company | Similarity | Market Cap |
|---|---|---|
| Hyliion | 84% | |
| Bloom Energy | 83% | |
| Intelline | 74% | |
Mainspring Energy Funding Rounds
Historical fundraising activity
| Round | Date | Amount Raised | Valuation | Investors | Sources |
|---|---|---|---|---|---|
| Series F | Apr 14, 2025 | ||||
| Grant | Oct 22, 2024 | ||||
| Series E | Sep 21, 2022 | ||||
| Series D | May 4, 2021 | ||||
| Series C | Jan 24, 2018 |
Key People
Founding team and executive leadership
Mainspring Energy Investors
Notable investors and investment history
| Investor | Rounds |
|---|---|
| CPP Investments | Series E |
| Pictet Group | Series F |
| 40 North Ventures | Series D |
| ClearSky | Series D |
| Fine Structure Ventures | Series E |
| Temasek | Series F |
| Khosla Ventures | Series F, Series D, Series E, Series C |
Market signals
Structured signals derived from secondary market and firmographic data.
- Apr 14, 2025
$258M round completed.
- Oct 23, 2024
Secured $8.679M in grant funding.
Mainspring Energy Filings
SEC and related filings with document metadata.
| Typed | Date | Amount Offered | Amount Sold | Filling | Pages | Download |
|---|---|---|---|---|---|---|
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Frequently Asked Questions
Common questions about Mainspring Energy's valuation, stock price, and market status.