Via the Washington Post, here’s a detail from a beautiful map of all the electricity plants in the United States, colored and sized according to type and capacity.
The details for Minnesota are highlighted:
I general, I guess you can say that Minnesota has a balanced energy footprint. We’re not as coal-heavy as many Midwestern states farther South and East, for example. That said, coal is still our #1 source of electricity by a wide margin.
Check out the original site for more detailed info, and to click around the country comparing carbon.