Startup · United States
Endurance Energy
HQ Seattle, WashingtonFounded 202511-50 employeesUpdated
Endurance Energy is developing undersea geothermal generators to harness baseload power from vast reservoirs of superheated ocean water at seafloor volcanic systems.
Funding2 rounds · ~$79.0M
- Equity raised
- ~$79.0M
- Latest
- $54.0MSeries A · Jun 11, 2026
| Announced | Stage | Amount | Valuation | Lead investors | Other investors | Confidence |
|---|---|---|---|---|---|---|
| Jun 11, 2026 | Series A | $54.0M | — | Founders Fund | Construct Capital, Felicis, First Round Capital, Point72 Ventures, Voyager Ventures | Confirmed |
| May 27, 2026 | Seed | ~$25.0M | — | Founders Fund | — | Reported |
- $54.0MJun 11, 2026
- SeedLed by Founders Fund~$25.0MMay 27, 2026
Raised counts equity rounds; debt, secondary sales and grants are totaled separately. Amounts in other currencies are converted at the announcement month's average rate. A ~ marks an estimated or converted amount.
Systems1
- AdélieA planned subsea geothermal power demonstrator.
Newest unveiled first. Systems that belong to a government program link to the program page, where variants, costs and contracts are.
Capabilities1
| Technology | Role | Maturity | TRL | Notes | Confidence |
|---|---|---|---|---|---|
| Power, grids and energy storage | Developer | — | — | classify_sectors run 37, haiku, taxonomy 2026-10-18b: Undersea geothermal generators for baseload power; no defense use stated. | Reported |
- Developerclassify_sectors run 37, haiku, taxonomy 2026-10-18b: Undersea geothermal generators for baseload power; no defense use stated.—Reported
Maturity and TRL describe this organization's work; the field-wide maturity is on each technology's page.
People3
| Person | Role |
|---|---|
| Andrew Redd · LinkedIn ↗ | CEO |
| Augustin Wambersie · LinkedIn ↗ | Founding Engineer |
| Eli Simmons · LinkedIn ↗ | Founder Engineer |
Sources7
Profile3
- 1
Crunchbase · Supports Organization · employee range
“employee_range: 11-50 (profile: 11-50)”
- 2CompanyEndurance Energy | LinkedIn
LinkedIn · Supports Organization · hq region, Organization · linkedin url, Organization · website
“hq_region: Washington (profile: Seattle, WA 98105, US)”
- 3
Supports Organization · founded year
“Year Founded 2025”
Systems1
- 4CompanyEndurance Energy
Endurance Energy · Supports System
“## Adélie Adelie is Endurance’s planned 100 kW subsea power system, designed to operate for one year inside the Axial Seamount caldera and connect to the OOI Regional Cabled Array off the Oregon coast.”
Funding2
- 5
ThinkGeoEnergy · Jun 11, 2026 · Supports Funding round · amount
“The funding round was led by Founders Fund, with participation from Ascend, Construct Capital, Felicis, First Round Capital, Point72 Ventures, Riot Ventures, and Voyager Ventures.”
- 6
Axios Pro · May 27, 2026 · Supports Funding round · amount
“closed $25 million to $30 million in seed funding”
People1
- 7OtherBlack Flag 100
Black Flag · Supports Organization, Role
“Endurance Energy is developing undersea geothermal generators to harness baseload power from vast reservoirs of superheated ocean water at seafloor volcanic”
Each fact on this page is attached to the sources that support it. Archived copies are linked when we keep one.