Three Mile Island, the Pennsylvania power plant that was the scene of the worst commercial nuclear accident in American history, will reopen and sell power to Microsoft.

The owner of the shuttered Three Mile Island nuclear power plant says it plans to restart the reactor under a 20-year agreement that calls for tech giant Microsoft to buy the power to supply its data

Shares of exchange-traded funds that focus on companies related to the nuclear industry were leaping Friday after Constellation Energy Corp. announced it was restarting a nuclear reactor at Three Mile Island under a power-purchase agreement with Microsoft Corp.