Power has been restored to all areas east of Charlottetown after an outage that affected 10,000 customers from Stratford to East Point Monday morning, says Maritime Electric.

Calls started coming in to the utility around 5:30 a.m. reporting outages and sightings of "massive fireballs" near the Crossroads substation, said Maritime Electric spokeswoman Kim Griffin.

By 6 a.m. crews found a major transmission line had come down on another wire, causing the fireball and cutting power to five substations.

"This morning when the line would have come down and hit the other line, there would have been a fire or a fireball, if you will, is what they were calling it, a large spark. But it certainly was enough for people to hear a noise and see what they're calling a massive fireball this morning," said Griffin.

Power was back on in all areas by 8:45 a.m.

It's not known what caused the transmission line to come down, although it's possible the stress from a difficult winter caused the line to break, Griffin said.

Maritime Electric fixing downed line

About 10,000 customers were without power, says Maritime Electric. (Pat Martel/CBC)

The Charlottetown Rural, Morell, Montague and Souris families of schools and the French language school in Souris operated on a one-hour delay.

Holland College in Georgetown also delayed opening until 9 a.m.