ANCHORAGE (KTUU) - UPDATE 11:30 p.m.:
The Matanuska Electric Association wrote in a tweet on their public information handle that power was restored to most customers with the exception of about 835 customers who were directly affected by the damaged feeder.
Those still affected by the outage should expect to have no power for at least six hours, officials wrote.
MEA now says as many as 25,000 customers are without power and six substations are down.
The Matanuska Electric Association is reporting a large power outage affecting customers in the Fairview Loop area all the way to Big Lake.
According to a tweet by the utility, five substations are down and about 20,000 customers are without power, nearly half of all MEA customers. The outage was caused by a vehicle crashing into a transmission line near Bogard Road.
MEA spokeswoman Julie Estey told Channel 2 that crews are on scene now and should be able to reroute power and isolate the outages shortly.
"Because of the location we should be able to reroute power and isolate the numbers impacted. We should be able to reroute power shortly," Estey said.
Crews will need to make repairs to the damaged line, making it difficult to predict when power will be fully restored, Estey said.
The utility also says it is experiencing issues with its phone and website.
This is a developing story. Check back for updates.