Maine Question 1, the Legislative Approval of Certain Electric Transmission Lines Initiative, was on the ballot in Maine as an indirect initiated state statute on November 2, 2021. It was approved, with 59.20% voting in favor, but was ultimately unsuccessful in its main goal to block construction of the New England Clean Energy Connect powerline, due to subsequent legal action.
The measure appeared on the ballot as follows:
The measure was approved with about 59% of the vote.
Developers of the New England Clean Energy Connect sued on November 3, 2021, the day after the referendum, to assert that the law established by the referendum could not be retroactively applied to their project due to construction being far enough along, referred to as "vested rights" in the project. After a trial, on April 20, 2023, a jury unanimously agreed, eventually allowing construction on the power line to resume. A lawsuit to pull the federal permits issued to the project was denied in March 2025, ending the last legal challenge to the project. Construction will be completed by the end of 2025, with the corridor coming online in 2026 after a testing period.