Vistra shares climbed on the back of a Bloomberg report that said the company would receive a roughly $4.2 billion loan from the U.S. to boost its nuclear power-generation capabilities.

The stock rose 6%, to $148.46, in premarket trading Monday. Through Friday's close, shares are down about 15% year to date.

Energy Secretary Chris Wright will make the announcement on Monday at Vistra's nuclear power plant along Lake Erie in Ohio, according to Bloomberg, which cited a person familiar with the matter that spoke on the condition of anonymity.

The electricity and power-generation company will use the loan to boost power output across at least three of Vistra's four nuclear stations, the report said.

Neither the Department of Energy nor Vistra didn't immediately respond to requests for comment from Bloomberg.

The loan comes amid President Trump's push to quadruple U.S. nuclear power capacity by 2025.

The Department of Energy has hundreds of billions of dollars in financing available from its loan office, and Wright has previously said the bulk of that loan capacity will support nuclear power plants.