POWER OUTAGE

KUCB Staff

 

A number of recent unplanned power outages in Unalaska were caused by an electronic governor — located on one of the city's diesel engines — that needs retuning, according to city officials.

Public Utilities Director Dan Winters said at a City Council meeting Tuesday night that what's supposed to happen is that when the engine is shutting down it comes down automatically, at about 1000 kilowatts and then it will open the breaker. But it's currently shutting down at more than twice that amount — at about 2500 kilowatts — and kicking the breaker.

KUCB Staff

An unplanned electrical outage on Monday left Unalaska without power for more than an hour and a half.

The city-wide outage was caused by a failed transfer switch on East Point Road around 1 p.m., according to the city's Public Utilities Director, Dan Winters.

"It took awhile to find out where the ground fault," he said. "Each component from the powerhouse to the ground fault needs to be tested."

KUCB Staff

Updated 6/13/19 at 3:40 p.m.  

The City of Unalaska is still trying to fix damaged powerhouse equipment that's prompted about five outages in the last week and a half.

Public Utilities Director Dan Winters said the city flew in an engineer on Tuesday to examine a viper control switch, which has run aground for unknown reasons.

KUCB Staff

Unalaska's power is back on after two island-wide outages in the last two days.

The city's Department of Public Utilities has rerouted electricity around a damaged control switch at the powerhouse. That switch spurred the first, unscheduled outage Tuesday around 7 p.m.

"Everything tripped offline, meaning the generators and all the field breakers in the powerhouse opened up," said Utilities Director Dan Winters. "We found out one of our viper control switches was bad, and it blew a potential transformer."

KUCB Staff

In downtown Unalaska and the valley, communications are returning to normal after a power outage Tuesday affected landline telephones, internet service, and other networks.

The outage was caused by a leak in a powerhouse engine's cooling system, according to Public Utilities Director Dan Winters.

While it took several hours to isolate and repair the leak, Winters said the city's electrical operations are back to normal and he doesn't expect any similar problems in the future.