Baltimore Gas and Electric Co. was working last night to restore power to 8,700 customers in Glen Burnie and Severna Park, a company spokeswoman said.

About 5 p.m. yesterday, a problem with a supply circuit to a substation in the Earleigh Heights area caused the outage, said Kelly Shanefelter, the spokeswoman.

Power was restored about 7 p.m. but was soon out again when a separate problem occurred with three supply circuits, Shanefelter said.

Crews hoped to restore power by midnight last night, she said.