LEWISTON — A failed transformer knocked out power to roughly 6,700 customers of Central Maine Power Company, a spokeswoman said Tuesday morning. Power has since been restored.

When the Lisbon substation went down at about 9 a.m., customers in that town and seven surrounding towns lost power, Gail Rice said. The towns affected included: Bowdoin, Brunswick, Durham, Freeport, Lewiston, Sabattus and Topsham. Some traffic lights along Route 196 between Topsham and Lewiston were reported not to be working.

Power was restored to 4,800 customers by 11 a.m., and the remaining 1,900 affected customers in the Lisbon area had power restored by 11:40 a.m., Rice said.

The cause of the failure was unknown Tuesday morning, Rice said.

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