Improving service in the Silver Valley   

Tags: Avista Utilities, Electricity, Idaho, Infrastructure upgrades, Rates, Weather

Burke-Thompson
Vertical brace
The Burke-Thompson Falls A and B  trans-
mission structures were originally constructed
in 1924. Avista crews are replacing the old
wooden poles with taller, steel poles. The
new  design will stage the poles closer to
the center of the right of way, which will
improve efficiency, as the likelihood of a
tree falling on the line diminishes. The new
design requires 50 percent fewer poles as
well.
Temporary bridge
To access the Burke-Thompson Falls A and
B transmission lines, we’re building three
temporary bridges so our equipment can
safely cross. Shown below, a temporary
bridge a crew is setting over the existing
bridge.
Avista upgrades nearly 90-year old equipment to improve safety and reliability
 

At the east end of the Silver Valley stands the Burke-Thompson Falls A and B transmission lines. Our customers in this region depend on these primary “arteries” of power to deliver electricity to their homes and businesses.

Situated in a remote location near the Idaho/Montana border, maintaining the Burke-Thompson Falls lines carries its own set of challenges. And part of the solution is rebuilding 8-miles of lines to better serve our customers.

The rural reality
The Silver Valley is known for its beautiful forests and ample snow in the winter. The rural reality – lots of snow and trees don’t bode well for transmission lines.
 
“The snow levels can get very high in that area,” said Kellogg Operations Manager Bob Beitz. “When outages occur in the winter, we can't access them without a Sno-Cat. When our crews jump out of the cat, they are up to their armpits in snow. Trying to replace a pole in those conditions is a herculean effort.”

All that snow can weigh heavily on the forested areas near the power lines, which can result in falling branches and toppling trees. Even if our rights of way are 100-feet wide, falling trees can cause power outages. 

The solution: A rebuild to alleviate outages and concerns
This year, we’re rebuilding 8 miles of electric transmission lines from Burke to the Montana border to improve the safety and reliability of delivering power to our customers. The project carries a price tag of $2.5 million. It’s part of Avista’s ongoing investments to maintain and upgrade our electric system.

The transmission lines were originally constructed in 1924. Though updated several times over the decades, many of the original structures still exist and will be replaced this year. We’ll be re-using the existing wire for the project.

Avista crews are replacing the old wooden poles with taller, steel poles. The new design will stage the poles closer to the center of the right of way, which will improve efficiency, as the likelihood of a tree falling on the line diminishes. The new design requires 50 percent fewer poles as well.

Investing in the future
Many parts of our system are 30, 40 and even 50 years old. Some of the poles on the Burke-Thompson Falls A and B lines are nearly 90 years old.

As we rebuild this section of our electric transmission system, we’ll also have to build three temporary bridges to accommodate the heavy equipment necessary for the construction project.

It’s a big job, but it’s well worth the effort. This is another example of what it takes to provide safe, reliable service for our customers, now – and in the future.
 
Posted by  System Account  on  7/10/2012
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