Years of reduced spending on tree clearing preceded major N.B. Power outage

N.B. Power is blaming trees being pushed onto power lines by high winds for the severity of outages that struck more than 100,000 of its customers this week.

But so far the utility isn't saying if a reduction it implemented in its power line tree-cutting programs over the last six years, including a big reduction this year, is part of what went wrong.

"The most significant contribution for outages are fallen trees and vegetation on lines," N.B. Power spokesperson Dominique Couture said on Wednesday in an interview with CBC's Information Morning Fredericton.

"We do proactive tree maintenance all around the year but the reality is we cannot cut off all of the trees, and in this case we are seeing very large uprooted trees on our lines."

N.B. Power has an annual tree-cutting program along transmission and distribution lines that it expanded in 2014. That's the year post-tropical storm Arthur blew through New Brunswick, knocking out electricity to more than 200,000 N.B. Power customers, some for more than a week.

Trees hitting power lines caused many of the blackouts in that event as well, triggering a multi-year, multimillion-dollar effort by N.B. Power to "widen" distances between trees and more than 6,000 kilometres of its power-line corridors.

Spending by N.B. Power on managing tree growth along power lines peaked in the 2018 fiscal year at $15.5. million, a 48 per cent increase from what the utility spent in the year before Arthur hit.

Former N.B. Power president Gaetan Thomas said climate change was causing vegetation to grow faster and the utility had to increase what it spends on cutting to keep up.

"We've seen tree branches grow by eight feet in one summer," Thomas told CBC News in 2015.

"We've had certified arborists that have been consulted and they're saying they've never seen something like that."

However, with N.B. Power under increasing financial pressure, spending on clearing power lines fell back to $12.5 million in 2019 and then reduced further to $12 million in 2021 and 2022. 

In 2022, the utility initially budgeted to return spending on power-line tree clearing back above the $15-million level but ultimately left $3.1 million of that amount unspent.

Wind damage from Monday's storm was severe in several locations and outages were inevitable no matter how much tree clearing had been done beforehand.

Richard Corey, the mayor of Harvey-Royal, said in his area the storm was more destructive than anything he has witnessed before and that includes Arthur.