JUNEAU - Alaska Electric Light & Power lost power from part of the Snettisham Hydroelectric Project on Wednesday morning, cutting power to about 45 percent of Juneau, the company said.
The big Snettisham plant has three power units, but one remained online the entire time, said Gayle Wood, AEL&P spokeswoman.
The power was out from 9:37 a.m. in parts of Juneau, and was fully restored by 10:07 a.m. to all parts of town, she said.
"We brought up some diesel while troubleshooting, but we were able to turn if off pretty quickly," she said.
It is still not clear what caused a valve at the hydroelectric plant to close unexpectedly, she said.
"At this point we're still troubleshooting, but we're back on Snettisham and carefully monitoring our load," she said.
The outage affected various parts of town as the utility's computerized systems worked to match demand for power from various parts of town with the power that was available, she said.