An energy company has received the final permit it needs from Maine to build a controversial hydropower transmission line project that promises to power hundreds of thousands of homes in Massachusetts.

The project is slated to supply up to 1,200 megawatts of Canadian hydropower to the New England power grid. Maine voters rejected the project in a 2021 referendum after opponents ran a campaign alleging it would destroy woodlands in the state.

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A jury ruled in 2023 that developers had a constitutional right to proceed. Avangrid Inc., the power company behind the project, received the final permit it needs for the New England Clean Energy Connect corridor on Nov. 19.

Final testing of the CMP corridor is on track to be

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