Endurance Energy says its prototype marine geothermal power system generated more electricity than it consumed during a recent deployment 300 miles off the Oregon coast — though the milestone lasted just 8.7 seconds.

The Seattle-based startup landed its 3-ton power plant on the seafloor near a natural vent releasing water at about 538 degrees Fahrenheit. The team operated the system remotely through a fiber-optic network running along the seabed.

The expedition marked Endurance’s fifth deployment to the ocean floor where it tested Adélie — a 100-kilowatt geothermal generator named for a penguin.

The company is part of a broader race to harness geothermal energy, using heat from water or steam under the Earth’s crust, converted into electricity. But while companies such as Fervo and Sage Geosystems focus on terrestrial sites, Endurance is the first commercial venture pursuing undersea sources.

“The main question we had is can the system generate more power than it uses,” Andrew Redd, Endurance’s founder and CEO, said in a statement about the expedition, which began last month.

“Adélie did,” he added. “Goddard’s first liquid-fueled rocket flew for two and a half seconds. Our first net-positive run lasted about nine. Our approach is to make it exist, then make it good.”

The test produced only a brief burst of surplus electricity, reaching a peak net output of 16.5 kilowatts. Challenges with the technology and a failure of a power cable cut the dive short.

The team also drilled what it called the world’s first geothermal well.

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