The traffic lights near Bangor City Hall will be shut off Tuesday.
Benchmark Construction will be shutting down power to City Hall on Harlow Street at 7 a.m., according to an alert from the city.
That also will affect the traffic lights at the intersection of Harlow and Central streets, which will be shut off, the city said Monday morning. Stop signs will be placed in the area.
The city expects power will be turned back on by 5 p.m.