The world’s first demonstration of a subsea geothermal power plant has taken place near an active underwater volcano almost a mile below the ocean surface. It generated less than 10 seconds of net-positive electricity but showed the technical feasibility of tapping another form of renewable energy underwater.

The three-week test deployment of the 3-ton prototype power plant took place at the Axial Seamount in the northeast Pacific Ocean in September. Endurance Energy, the Seattle-based startup behind the effort, aims to eventually commercialize subsea geothermal power for Pacific island nations and other customers looking for alternatives to importing expensive fossil fuels.

“The deep ocean gives us unlimited cold seawater for cooling, and its weight keeps the system and the well pressurized, so our plants can be compact,” said Andrew Redd, founder and CEO of Endurance Energy, in an email to Ars.

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One argument that often comes up about climate change is that fossil fuels are good because they powered economic growth that has left most people better off overall. And, to an extent, that has been true, but it's also an extremely limited perspective.

It's pretty obvious now that the growth they powered has come with very high costs that we've only recently started to pay, in the form of damages and disruptions from extreme weather events. With things like sea level rise expected to continue for centuries even if we hit net zero, it's difficult to estimate how expensive that growth will eventually be.

But that perspective is also limited: We now have better ways to power our growth—ways that are less environmentally damaging now and won't leave our descendants with a carbon debt that will be difficult to manage.

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