The Trump administration plans to provide a roughly $4 billion loan package to Vistra to upgrade three of its nuclear plants, according to people familiar with the matter. US Energy Secretary Chris Wright is expected to announce the funding as soon as Monday during a planned visit to the Perry nuclear complex northeast of Cleveland.The package would support investments at Vistra’s two plants in Ohio and another facility in Pennsylvania, the people said, asking not to be identified because they weren’t authorized to speak publicly.