The St Paul centre is Moventas' fourth service unit in North America, joining bases in Texas, Oregon and Canada.
Moventas said the move to open another facility is part of its strategy to "localise its operations" and cut costs for the project owners.
The new facility means Moventas has engineers within a day's drive of "nearly all" of its North American fleet. It was first announced Moventas would open the facility in September 2014.
The company can service both its own and other manufacturer's gearboxes as well as use its Mobile Service Units to perform on-site repairs.
Moventas completed a restructuring programme in January, splitting its wind and industrial gear divisions.