Drogue Raises $20 Million to Power Floating Data Centers With Ocean Heat

A six-month-old startup called Drogue has raised $20 million to build data centers on floating ships powered by the ocean's heat, with a multi-megawatt prototype scheduled to go to sea in early 2028. The Washington, D.C.-based company, which had kept a low profile until now, disclosed the funding exclusively to TechCrunch. Investors include XYZ Venture Capital, Toyota Ventures, Tamarack Global, Dream, FDVC, Garuda Ventures, Flexcap, Boost VC, and Slow Ventures, among others.

That is a rapid pace of capital for a company with no operating hardware. The caveat: $20 million buys a prototype, not a fleet, and the technology Drogue is betting on was tested in the 1980s and then shelved.

Why put data centers on ships?

Co-founder and CEO Sam Sipe, a former U.S. Navy pilot who flew E-2D Hawkeyes off aircraft carriers, frames the problem as a timeline mismatch. "The data center industry is a real estate game, and so they're playing on 8- to 10-year timelines, including interoperability with utilities and [independent system operators]" that manage regional power grids, he said. "AI demand has increased 10x in just the last three years. It's completely incompatible."

Drogue's answer is to skip the grid entirely. Each vessel would live at sea for about a decade, crunching workloads close to its own power source.

How does the ocean-heat system work?

The technology relies on ocean thermal energy conversion, or OTEC, first developed in the 1950s. Surface waters, heated by the sun, are far warmer than the deep ocean, which averages about 39°F (4°C). Drogue's system works, in effect, like a heat pump run in reverse: instead of using electricity to move heat, it uses the temperature difference to generate electricity.

The cycle works in steps:

• Warm surface water cools the data center servers, absorbing their waste heat.
• The now-warmer water boils ammonia, a chemical that turns to gas at -28°F.
• The ammonia gas drives a turbine to generate electricity.
• Cold water pumped from 1,000 meters deep condenses the gas back into liquid.
• The ammonia loops back to the start of the sealed cycle, and the warmed water returns to depth, where it dissipates.

Sipe argues the resource is effectively inexhaustible. "There's basically no amount of heat we can pull out of that that will collapse that temperature differential," he said.

Is the energy resource big enough?

On paper, yes, by a wide margin. As the planet warms, the oceans absorb an additional 5.8 million terawatt-hours of energy every year, according to figures cited in the TechCrunch report. All of human civilization uses roughly 180,000 terawatt-hours annually — about 3% of the ocean's yearly heat gain. If Drogue takes a slice, the ocean, as the report puts it, will not miss it.

Why did this fail in the 1980s?

Sipe says he tracked down veterans of the early OTEC efforts to find out. "I just talked to everyone, basically interviewed them and figured out what went wrong, what went right, what would you do next. And everyone was like, dude, this stuff works. It's just a matter of being able to raise enough capital to build something big enough, because there's a sweet spot," he said.

His diagnosis: not physics, but engineering economics. "A lot has changed since the '80s, specifically manufacturing techniques around the pipe and the heat exchangers," Sipe said.

Data centers solve the other historical obstacle. Sending power ashore would need long, expensive cables, and at-sea manufacturing would require costly shipping of materials and goods. Servers are compact, and shipping data off the platform is cheap. In short, the customer finally fits the power source.

What happens next?

Drogue has secured "approval in principle" — a preliminary sign-off — from the American Bureau of Shipping, the body that sets and checks safety standards for ships. The company is now buying its first ship to build the open-ocean prototype. The first prototype should be at sea within two years, Sipe said. Future versions will sit on floating structures resembling offshore oil platforms rather than conventional ships.

The concept parallels Elon Musk's orbital data center pitch: put compute next to cheap power. The difference is that Drogue's platforms sail out rather than launch, avoiding rocket costs entirely. Whether 1980s-era physics plus modern manufacturing and AI-driven demand adds up to a viable business will get its first real test at sea in early 2028.