Meta today announced three deals to provide its data centers with nuclear power: one from a startup, one from a smaller energy company, and one from a larger company that already operates several nuclear reactors in the U.S. Oklo and TerraPower, two companies developing small modular reactors (SMR), each signed agreements with Meta to build multiple reactors, while Vistra is selling capacity from its existing power plants. Nuclear power has become a favored power source for tech companies as their AI ambitions have grown, providing stable 24/7 electricity. Startups and existing reactors have benefited from the race for data center power, though in different ways. Existing reactors tend to be the cheapest form of baseload capacity, but there are only so many to go around, which has pushed Meta and its peers toward SMR startups. Companies like Oklo and TerraPower are betting that by building a large number of smaller reactors, they’ll be able to bring the cost down through mass manufacturing. It’s a plausible hypothesis, though one that has yet to be tested. Meta’s …