UPDATE: Power plant tripped, causing widespread power outages in Alaska
Chugach Electric spokesperson Julie Hasquet explained the reason for much of Chugach's initial customer outage has also been linked to the problem at ML&P's Plant 2A.
Hasquet said all railbelt utilities are connected and pool certain aspects of their power generation. When 2A went down, Chugach and other power providers took part in "load shedding" in order to divert enough power to essential systems to avoid damage to generators or plants.
In shedding their loads, some customers experienced momentary power outages, even though their connections to the grid weren't interrupted or damaged themselves.
"It's really a good thing we're connected like this, to pick up demand when frequency gets too low," Hasquet said.
A plant tripped, going offline early Tuesday, and causing outages to thousands within the service area, according to ML&P spokesperson Julie Harris.
All customers within the ML&P service area are back online, Harris said.
The plant, Plant 2A, went offline, causing the load shed to create outages due to an automatic system which goes into place, Harris explained.
The investigation into what caused Plant 2A to go offline is still ongoing.
According to Chugach Electric's power outage map, around 600 customers remain without power.
Thousands of Anchorage residents are reportedly without power early Tuesday morning, according to providers.
Chugach Electric Association, on its online outage reporting map, initially showed more than 6,500 homes without power inside its service area. Of that figure, Dowling and Spenard made up the bulk of those reporting power loss. That number eventually fell to 500.
As for the other section of town making up the ML&P Service Area, including Anchorage's downtown, representatives said that around 5,000 people are without power.
According to ML&P, the outage is not concentrated in any one place and is scattered throughout the service area.
The cause is under investigation, but an ML&P spokesperson said it was a generation issue.