ANCHORAGE -

The Matanuska Electric Association is reporting a power outage Thursday afternoon which affected as many as 30,000 customers in the Mat-Su Valley.

In a Twitter post from MEA, the co-op reported all power restored as of 6:17 p.m. Thursday night.

An initial post on MEA's Facebook page, reporting the incident as a "large outage" spanning from Glacier View to Wasilla, appeared at about 4:30 p.m. Thursday. A Twitter post from MEA later gave the total number of customers affected, with about 3,000 still lacking power as of about 5:15 p.m.

MEA spokesperson Julie Estey had said crews were working to restore power Thursday night. While a Butte fire may be a factor in the incident, Estey said the sequence of events leading to the outage hadn't been conclusively determined.

"There is a fire in the Butte near one of our transmission lines," Estey said. "We're not ruling it out, but that's not the identified cause."

In a tweet from MEA shortly before 6 p.m., officials said a tree was the initial cause of the incident.

"It appears outage was caused by a tree falling into a transmission line," MEA officials wrote. "Needed repairs being made now."

After the initial loss of power, Estey says fluctuations in current proceeded down MEA's lines, causing a series of substations to trip offline in much the fashion as household circuit breakers do to avoid damage from power surges.

"There were nine substations that were tripped by the outage," Estey said. "All but two of them are now online."

Estey says people should visit the Facebook page for progress updates on MEA's efforts to restore power. She encourages MEA customers to report outages at its outage hotline, 746-POWR.