Courtesy of ZwitterCo Alex Rappaport thinks he can turn a big profit expanding his business from industrial-scale hog poop ponds to hyperscale AI data centers. As CEO of the water filtration startup ZwitterCo, Rappaport’s typical customers are ethanol refineries, mines, commercial farms and food processors, or any other industrial facility that needs to clean and recycle a lot of water. The company has raised about $100 million in the last few years to build out filters made of a proprietary material that sloughs off contaminants and waste — pig poop, for example — so that it can filter large amounts of water without needing to be replaced. Water has always been a niche and undervalued corner of climate tech, Rappaport says — in 2023, water-related startups globally raised about $1.5 billion, compared to $43 billion for climate tech at large. But that’s beginning to change, as the increasing frequency and severity of droughts due to climate change makes it plain to commercial water users that reducing their water footprint is an operational necessity. And a new class of customers is particularly drawing Rappaport’s attention: Data centers, which last year used about as much water globally — mostly to keep AI-crunching chips cool — as the city of London uses in a typical four-month stretch. ZwitterCo hasn’t yet locked in any data center clients, but Rappaport is keen to. With data centers on the rise, he said, “market forces might have finally reached a threshold where there is enough buying power and enough pervasiveness of this problem that [water sustainability solutions] could become a new trillion-dollar industry that venture capital can get really healthy returns from.” Data centers are usually under scrutiny for their massive hunger for energy. But their thirst may prove to be a bigger problem — with a juicy payoff for companies able to serve up solutions.
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