New Power Outage Strikes Parts of Idaho

SALT LAKE CITY — A second blackout struck parts of Idaho on Wednesday as officials focused on a Wyoming power plant and its transmission lines as the possible source of the outage.

A short-circuit along the same transmission lines may have triggered the rapid chain-reaction outages that knocked out lights and telephone service for 1.5 million to 2 million customers in eight western states Tuesday.

After Wednesday’s disturbance, utility officials could not re-energize the power lines from the Jim Bridger coal-fired plant near Rock Springs, Wyo., and a substation in southeastern Idaho, said Gary Donnelly, a spokesman for PacifiCorp, co-owner of the plant along with Idaho Power Co.

The utilities sent up a helicopter to inspect the 200-mile stretch of power line in hopes of discovering the problem, Donnelly said.

Wednesday’s disruption apparently was limited to Idaho. Power flickered out in southern Idaho at 2:10 p.m. local time, and the Idaho Statehouse was among the buildings that lost power for a few minutes.

“We have manually overridden the system and we are manually beginning to recover the system,” Dennis Lopez, a spokesman for Idaho Power Co., said late Wednesday afternoon.

Utility officials said it could take a week to find out what caused Tuesday’s short-circuit, which sent disturbances rippling through the western power grid.

“We can rule out sabotage. We can rule out UFOs. I think we can rule out computer hackers,” said Perry Gruber, spokesman for the Bonneville Power Administration in Portland, Ore., which operates a series of Northwest hydroelectric plants.