AP file A sign in protest of Central Maine Power's controversial hydropower transmission corridor is displayed along Rte. 201 near The Forks, Maine, Tuesday, Feb. 9, 2021. Note: The Pulse newsletter will not be published next week — reporter Steve Mistler will be on vacation. The debate over Central Maine Power’s controversial transmission project has raged for more than three years, long enough to make the arguments for and against it seem repetitive and stale. However, the battle remains eminently consequential — and not just for the energy companies that stand to profit or lose money because of it. Those companies, including CMP, have combined to spend more than $32 million attempting to shape Mainers’ views of the 145-mile corridor in advance of a November referendum. That includes $7 million in just the past three months, according to the latest campaign finance reports.