HARRISBURG — The U.S. Department of Energy said Tuesday that it will loan $1 billion to help finance the restart of the nuclear power plant on Pennsylvania’s Three Mile Island that is under contract to supply power to data centers for tech giant Microsoft.

The loan is in line with the priorities of President Donald Trump’s administration, including bolstering nuclear power and artificial intelligence.

For Constellation Energy, which owns Three Mile Island’s lone functioning nuclear power reactor, the federal loan will lower its financing cost to get the mothballed plant up and running again. The 835-megawatt reactor can power the equivalent of approximately 800,000 homes, the Department of Energy said.

The reactor had been out of operation for five years when Constellation Energy an

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