Sanford has a new 28-megawatt solar array online, one of the largest installations in southern Maine.

The Mousam River Solar Project is built on 140 acres of privately owned parcels of land and can provide enough electricity for 6,000 homes.

Jack Kenworthy, Chief Development Officer for Walden Renewables, said it offers the kind of clean energy that grid operator ISO - New England is looking for.

"There's space for projects like this to be developed in Maine. There's capacity on the grid for projects to inter-connect. There's willing buyers for the power. So I think there's the right combination of ingredients in a large electricity market that has a lot of demand for renewables," Kenworthy said.

Kenworthy said there is a buyer for the power from the project with a large presence in Ma

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