Central Maine Power is planning to ask state regulators for permission to raise its rates each year for the next five years starting with a big bump late next year.

The electrical utility, which is the largest in the state, issued a notice on Tuesday that it would file a request that day with the Maine Public Utilities Commission for approval of a five-year plan that would start Oct. 1, 2026.

Under the proposal, the bill of a typical residential customer using 550 kilowatt hours per month would go up by a total of $35 per month over the five-year term, generating a total of $427 million in revenue for the utility, according to CMP.

The increase would be steepest at the start, jumping $17 per month in the first year, then $5 per month the following year, $4 per month in each of the next

See Full Page