# Mainspring Energy: valuation, funding, and the secondary tape

## The short version

- No priced instruments on record yet; milestones only.

| instrument | value | as of | source |
|---|---|---|---|
| Claimed valuation | n/a |  | graph |


## Recent milestones

- 2026-09-01 - [Mainspring Series E first close: more than $150M led by Lightrock, with Khosla Ventures, Bill Gates, Fine Structure Ventures (Fidelity-affil](https://www.mainspringenergy.com/news/mainspring-announces-deal-with-lineage-logistics-to-deploy-up-to-150-mainspring-linear-generators-first-close-of-series-e-at-150m)
- 2026-06-15 - [Mainspring Energy's first full-scale greenfield AI data center deployment comes online summer 2026 (Latitude Media): designed to scale to hu](https://www.latitudemedia.com/news/one-year-inside-mainsprings-data-center-pipeline)
- 2026-01-01 - [Mainspring Texas footprint (state PUC filing): a Texas facility producing approximately 1,000 linear generators annually; one existing custo](https://interchange.puc.texas.gov/Documents/57236_37_1485890.PDF)

[marks](https://data.somen.ai/marks) | [napkin](https://data.somen.ai/napkin) | [scorecard](https://data.somen.ai/scorecard) | [all companies](https://data.somen.ai/companies)

*Derived from the SOMEN graph at render time. The arithmetic cannot lobby you.*