Endurance Energy
United States, Seattle, WA
About Endurance Energy
Endurance Energy is a Seattle-based deep-tech startup developing undersea geothermal power generators that tap heat from the seafloor to produce baseload renewable electricity. The company recently launched a subsea pilot with the Kingdom of Tonga and is targeting island grids and military installations as early customers.
Latest Funding
SeedAnnounced 2026-05-27
Buying Signals
Where the capital is going, and whether it's already started moving.
Spend Intent
3 signals · where the capital is going
Target island grids and military installations (Department of War partnerships referenced) as early geothermal customers.
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+2 more capital deployment signals · confidence ratings · source articles
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12 open roles · capital meeting headcount
R&D spend backed by 8 engineering hires, product build in motion
8 engineering roles, technical investment focus
+2 more hiring signals · full department matrix · role-by-role drill-down
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Investors
First Round Capital
Lead investor · Seed
Tech Stack
React
HSTS
HTTP/3
Key Highlights
AI InsightsFounders Fund led the round — at least its third significant next-generation energy investment so far in 2026.
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