Thousands of Central Maine Power Co. customers who lost power Sunday afternoon now have it back on.

CMP reports that power was restored around 4:23 p.m. to an estimated 6,300 customers in Portland’s Deering neighborhood and Falmouth.

The dispatcher said it appears the outage was caused by a fire at the company’s Bishop Street substation in Portland. A power company dispatcher said the power went out at about 2:45 p.m.

The power outage knocked out street lights in the area, causing some minor traffic problems.

In a separate outage, CMP reported that 330 customers in Portland and Falmouth — only three live in Falmouth — lost power around 6 p.m.

The cause of that outage is still under investigation, but the company says it is hopeful power would be restored by 8 p.m.