Mankato Power Plant

The Mankato Power Plant is a natural gas-fired, combined-cycle facility. This facility is Calpine’s first project in Minnesota and the NERC region, MRO. Under a contract with Northern States Power, Calpine operates the electric power plant. During construction the project supported hundreds of jobs in the community. Now operating, approximately 17 jobs, plus numerous indirect jobs, remain in place.

The facility provides electric power to Northern States Power under a 20-year purchase power agreement to help meet the growing needs in Minnesota and the Upper Midwest. The plant is the first large-scale project in Minnesota to use recycled water for cooling. The cooling water for the plant is supplied from the municipal wastewater treatment plant. Calpine paid for improvements to the City’s treatment system that cleans both the water that is used in the power plant and the water that the City discharges to the Minnesota River. Overall, the discharge to the river is cleaner than current and expected future standards.


Mankato, MN

Commercial Operation Date:

July 2006

Calpine Net Interest Baseload (MW):

280 megawatts

Calpine Net Interest With Peaking (MW):

375 megawatts


Calpine 100%


Natural gas-fired, combined-cycle


Seimens Westinghouse combustion and Toshiba steam

NERC Region: