"We had a malfunction in a vault that serves the Wells Fargo Place," Patti Nystuen of Xcel Energy told the newspaper. "We had to do some extensive work in that vault, which houses the electrical equipment that serves the building."
Some power was restored early Monday morning, but the 37-story building remained closed as a precaution.
"We're still in process of testing all of our building systems," added General Manager Pat Skinner. "At this point we feel very confident we'll be open again [Tuesday]. ... Its unfortunate, but from a safety standpoint it's a short-term inconvenience."
Wells Fargo Bank and Minnesota State Colleges and Universities are among the 40 tenants in the office tower.