LONDON :Hitachi Ltd [6501.T] signed a deal  with the U.S. Department of Commerce on Tuesday to promote investment in grid modernization, as the U.S. faces record electricity demand from Big Tech's build-out of artificial intelligence data centers.   U.S. President Donald Trump visited Japan on Tuesday and the two countries agreed to a deal on new-generation nuclear power reactors and rare earths. Hitachi, headquartered in Tokyo, said its agreement with the U.S. will advance grid modernization

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