Rodney Porter wears a top hat indicating his rejection of Central Maine Power's proposed hydropower transmission corridor, during an election night party Tuesday in Farmington. Credit: Robert F. Bukaty / AP

FARMINGTON, Maine — Central Maine Power Co. was dealt a major blow Tuesday when voters backed a question aiming to kill its $1 billion hydropower corridor in a move that will rock the regional energy market and spur more legal wrangling.

The “yes” side of Question 1 had 59 percent of votes to the “no” side’s 41 percent when the Bangor Daily News and its election results partner, Decision Desk HQ, called the race at 9:48 p.m. with 53 percent of precincts reporting unofficial tallies.