This document summarizes the key findings of a study estimating the external health and environmental costs of electricity generation in Minnesota. The study finds that the total annual costs are $2.454 billion, with a range of $1.041 to $3.562 billion. Nearly 94% of the costs are from coal-fired power plants, which account for 58% of Minnesota's electricity. The costs per kilowatt hour of electricity generated are 4.6 cents for all sources and 6.8 cents for coal specifically. These estimates are significantly higher than those used previously by Minnesota regulators.