# Endurance Energy secures $54 million to develop subsea geothermal

**Published:** 2026-06-12T02:09:01.590Z  
**Topic:** Endurance Energy raises $54M to harness a massive untapped energy source  
**Sentiment:** neutral  
**Publisher:** TrendWatcher — https://www.trendwatcher.in/article/067082bb-8f10-4022-9947-96d01f20f1aa

Seattle startup Endurance Energy raises $54 M to tap deep‑sea volcanic heat, aiming for gigawatt‑scale clean electricity with a 100 kW pilot this fall.

Endurance Energy, a Seattle‑based clean‑energy startup, announced a $54 million Series A round led by Founders Fund to develop technology that extracts power from undersea volcanic heat [1]. The funding will support the deployment of its first 100 kW generator, “Adelie,” on the Juan de Fuca ridge later this year [1].

**Key takeaways**
- Endurance raised $54 M in a Series A round led by Founders Fund, with participation from Felicis, Voyager, Riot, Construct Capital, Point72, First Round and Ascend [1].
- The company’s team of 25 includes 12 former SpaceX engineers and a VP of engineering formerly at Helion Energy [2].
- Endurance plans to drill to volcanic systems up to 1,000 ft deep, where water reaches 728 °F, and aims to scale to gigawatt‑level output [1].
- A pilot 100 kW system, “Adelie,” will be installed on the Juan de Fuca ridge this fall, marking the first complete subsea geothermal power unit [1].
- Founder Andrew Redd, a former SpaceX Dragon and Starship engineer, positions subsea geothermal as the only viable baseload renewable for 24/7 power [2].

## Building a subsea geothermal prototype

Endurance’s founder and CEO Andrew Redd left SpaceX in 2024 to launch a venture that targets the untapped heat beneath the ocean floor [2]. Over the past year the startup completed four prototype deployments to deep‑sea volcanoes, each reaching depths of nearly 1,000 feet where magma heats seawater to roughly 728 °F [1]. The company’s approach differs from traditional geothermal projects, which drill into land‑based reservoirs; instead, Endurance seeks to harness the same thermal energy directly under the sea, a resource the firm says could eventually deliver terawatts of power [2].

The upcoming “Adelie” system will be the first fully integrated unit capable of drilling, generating electricity, and transferring that power to shore via submarine cable [1]. By targeting the Juan de Fuca ridge—an underwater volcanic range off Washington and Oregon—Endurance hopes to demonstrate commercial‑scale feasibility within two years, with the long‑term goal of gigawatt‑scale generation comparable to the 6.8‑GW Grand Coulee Dam [1].

## Why it matters

Geothermal currently supplies only about 0.4 % of U.S. electricity, but its potential for continuous, carbon‑free output makes it attractive as demand from AI data centers, electric vehicles and heavy industry rises [1]. Endurance’s claim that subsea geothermal could unlock 6 TW of capacity around the Pacific “Ring of Fire” suggests a substantial addition to the energy mix, though the estimate is a projection from the founder [2]. If the pilot succeeds, it could open a new frontier for renewable power generation, reducing reliance on land‑based sites and leveraging existing offshore drilling expertise from the oil and gas sector [2].

The next steps include completing the Adelie deployment this fall, validating power output, and scaling the technology toward larger installations. Investors such as Founders Fund and other venture partners see the approach as a high‑risk, high‑reward opportunity to diversify the clean‑energy portfolio and address the growing need for baseload renewable electricity.

## Sources
1. GeekWire — [With $54M and a SpaceX playbook, Seattle’s Endurance races to tap deep-sea volcanic power](https://www.geekwire.com/2026/with-54m-and-a-spacex-playbook-seattles-endurance-races-to-tap-deep-sea-volcanic-power/)
2. TechCrunch — [Endurance Energy raises $54M to harness a massive untapped energy source | TechCrunch](https://techcrunch.com/2026/06/11/endurance-energy-raises-54m-to-harness-a-massive-untapped-energy-source/)
3. AndroGuider — [Endurance Energy Secures $54M to Unlock Ocean's Geothermal Potential](https://www.androguider.com/2026/06/endurance-energy-secures-54m-to-unlock.html)

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Cite as: TrendWatcher, "Endurance Energy secures $54 million to develop subsea geothermal", https://www.trendwatcher.in/article/067082bb-8f10-4022-9947-96d01f20f1aa