In the video, skip the first five minutes to get to where the conversation begins.
If you already know about bitcoin and bitcoin mining, and various energy sources, you can skip to 0:38:00 for where Ocean Thermal Energy Conversion (OTEC) is introduced.
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Nathaniel was interviewed on Compass Podcast:
🎧 Turning Ocean Thermal to Hashrate | Compass Podcast #24157
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And another interview of Nathaniel, on Bitcoin Magazine LIVE:
🎧 #67 Ocean Bitcoin Mining with Nathaniel Harmon | Bitcoin Magazine LIVE #22762
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There is another post, here on SN, on OTEC -- for an article in Bitcoin Magazine:
How Bitcoin Can Unlock The Energy Of The Ocean For 1 Billion People #30837 https://bitcoinmagazine.com/business/bitcoin-unlocks-ocean-energy
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Ocean Thermal Energy Conversion (OTEC):
Uses the ocean as a solar battery.
The floating facility, the size of a container ship, can be done 10 miles offshore.
"I'm mad enough at paying $0.30 per kWh, I'm definitely not going to pay more. That's why they don't get built. Nobody's going to invest $200M in something that's not going to be profitable."
Bitcoin mining occurring onboard floating platform (in international waters).
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Here's a Tweet starting a Twitter thread that shares this video, and much more:
THREAD: How will #Bitcoin promote human flourishing and decarbonization for 1 Billion people? By turning Earth's oceans into a giant solar panel, through 19th-century Ocean Thermal Energy Conversion (OTEC) technology, that has been stymied by economies of scale. 1/
The full (long) thread, unrolled:
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Ocean Thermal Energy Conversion (OTEC):
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Nathaniel Harmon discovered bitcoin in 2013 and yammered uncontrollably about it just like we all do. But he failed to orange pill his classmates and faculty members at the University of Hawaii. Instead, he inspired an undergraduate class led to choose as a topic the horrors resulting from bitcoin-mining-related emissions. With their "rock star" prof, Camilo Mora, they managed to place a 2-page comment in Nature: Climate Change forecasting 2 degrees C of warming from bitcoin mining alone.
Nathaniel is 100% to blame.
Seriously though, he tell the story of how that infamous paper came to be written, "by children," and published by a prestigious journal, despite being "the academic equivalent of a shitpost."
But that's only the beginning. Nathaniel himself predicted the increase in renewable penetration in bitcoin mining, but was shut down by every relevant department and had to choose a different thesis topic. Undeterred, he built a bitcoin business and kept exploring ways of making good on bitcoin's promise to transport value from energy across space.
His idea now? Using bitcoin mining to scale up testing of ocean thermal energy conversion (OTEC), which uses a difference in deep and shallow water temperatures to generate electricity. He spells out a financial obstacle here that bitcoin fixes.
He paints an incredible picture. A barge with bitcoin miners and a 1km "straw" plunging down into the depths, returning super-cool water as byproduct to cool the miners, spinning turbines for power, and able to avoid hurricanes by outrunning them. Talk about stranded energy! That power will be competitively priced and miners overclocked 30-40%.
There's theoretically 2TW capacity in the ocean before too much cold water is at the surface... there is energy EVERYWHERE, people!
If it works at scale, OTEC can park off the shore of any tropical city near deep water to provide a firm load at around $.05/KWh with miners out not the barge too, to balance the intermittency created by on-shore renewables.
Fully 1 billion people could be served by this form of power. Abundance, abundance, abundance.
Nathaniel Harmon - Bitcoin, Energy, and the Environment, by Troy Cross https://anchor.fm/troy-cross0/episodes/Nathaniel-Harmon-e1gl1t4
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Large Scale Distribution of OTEC Thermal Resources:

OceanBit Energy is the project co. Makai Ocean Engineering is our technical partner. DM me let’s talk

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Twitter for Makai Ocean Engineering: https://twitter.com/MakaiOceanEng
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I had some fun thinking through this prototype last night @thetrocro @BlockchainHI1 @level39. Inspired by the lines of the ocean and designed to cut through hurricane winds. DISCLAIMER: Very conceptual🙃
[Images]
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There are a number of other organizations (academic and industrial) involved in the OTEC field:
However OceanBit seems to be the pioneer in attempting to design a system that optimized for Bitcoin mining solely (with the long-term hope that the R&D and operations for doing it for Bitcoin mining eventually helps OTEC become more feasible for providing baseload energy onshore.)
This might be how five years ago, only a small number of people (e.g., Steve Barbour) were gaining initial expertise in using waste gas from oil and gas operators as an energy source, and now Exxon and others are involved.