FILE – In this Tuesday Jan. 20, 2015 file photo, a plume of steam billows from the coal-fired Merrimack Station in Bow, N.H. New Hampshire?s largest utility, Eversource Energy, announced Thursday March 12, 2015 that it has has agreed to sell its power plants. Eversource will sell its nine PSNH hydro facilities and three fossil fuel plants, including the Merrimack Station in Bow, Newington Station and Schiller Station in Portsmouth. (AP Photo/Jim Cole, File)