The state of Minnesota has repeatedly overvalued Enbridge Energy's oil pipeline system, a state Tax Court judge ruled Tuesday, possibly leaving several counties on the hook to pay tens of millions of dollars in tax refunds.
The Minnesota Department of Revenue overvalued Enbridge's pipeline system by $2.2 billion in 2014 and by $880 million and $156 million respectively in 2013 and 2012, wrote Judge Joanne Turner of the Minnesota Tax Court. Unlike most property, pipelines are assessed by the state, though much of the tax proceeds flow to counties.
"This is concerning for counties, though I can't say it's a surprise," said Matt Hilgart, general government policy analyst for the Association of Minnesota Counties. "We have been holding our breath for the worst-case scenario."
Enbridge's pipelines traverse 13 northern Minnesota counties, and some of them count on Enbridge for a large portion of their tax base. At least two counties — Clearwater and Red Lake — could end up refunding more money than they raise annually from all of their taxpayers.
The tax court's ruling didn't directly establish refund amounts, but Turner agreed with Enbridge Energy's position on some key points about pipeline valuation.
The company has said it was overtaxed by $15 million to $20 million during 2012 through 2014, the years covered by Tuesday's court filing. Enbridge Energy has also sued the state for the tax years 2015 through 2017, cases which have yet to be heard. Enbridge claims that through all six years, it's cumulatively due up to $55 million in refunds.
"The issue will be magnified by three more years," Hilgart said.
Caught in the middle
Enbridge Energy is a subsidiary of Calgary-based Enbridge, the largest pipeline operator in North America. Enbridge has six pipelines on a common route that together transport about 2.5 million barrels of oil per day from Alberta to the company's terminal in Superior, Wis.