Montana-Dakota Utilities Co., a division of MDU Resources Group, signed a PPA with Thunder Spirit Wind LLC, a subsidiary of Wind Works Power. The agreement is for approximately 105 MW of installed capacity of wind turbine generators to be located in southwest North Dakota. The generation will interconnect at Montana-Dakota’s substation near Hettinger, ND. The project is expected to begin commercial operation in the fourth quarter of 2015. Montana-Dakota issued a request for proposal earlier this year for electric capacity and energy.