An anonymous reader quotes a report from Reuters: Google has contracted for 3,590 megawatts of power from Constellation Energy on the largest US power grid, with new nuclear energy accounting for about a quarter of that supply, the companies said on Tuesday. Constellation will make more than $4.3 billion of new investments in its fleet as part of the agreement, which involves adding capacity at several of the power company's nuclear reactors in the Midwest and Mid-Atlantic regions, the companies said. [...] Over the last two years, Constellation unveiled an agreement to restart its Three Mile Island reactor in Pennsylvania to serve Microsoft data centers, while Google contracted to restart NextEra Energy's nuclear power plant in Iowa. In the latest arrangement, Google entered into a 20-year power purchase agreement for 890 megawatts of electricity from multiple Constellation-owned nuclear power plants, which would be upgraded to produce more electricity from existing reactors. Electricity from the first of the upgraded plants is expected to be delivered in 2028, the companies said. Google also entered into a 15-year supply agreement for an additional 2,700 megawatts of power from Constellation in the PJM power grid. That power is not tied to a specific generation source and serves as long-term revenue certainty for Constellation's operating plants, Google said. Maryland-based Constellation is the largest US nuclear power plant operator and owns a major fleet of natural-gas-fired power plants as well as geothermal energy following its acquisition of electricity producer Calpine Corp earlier this year. [...] The 11 nuclear units expected to be upgraded as part of the arrangement with Google are in Illinois, Pennsylvania, and New Jersey, within the footprint of the largest US electric grid -- PJM Interconnection. Joe Dominguez, chairman, president and CEO of Constellation, said the arrangement with Google is a "model for how technology companies and the energy industry can work together to responsibly develop the digital economy and invest in our nation's energy infrastructure in a way that delivers grid-wide benefits for all, funded by private entities."

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