THREE MILE ISLAND, Pennsylvania, Oct 16 (Reuters) -

C onstellation has ordered a main power transformer for

the Three Mile Island nuclear reactor it is trying to reopen in

Pennsylvania, pushing ahead with work critical to the plant's

revival, Reuters learned on a tour of the site on Wednesday.

The transformer is the biggest piece of equipment that will

need to be replaced for restart of the plant that has been shut

since 2019.

The transformer will cost about $100 million, Constellation

said.