(Duluth, MN) -- One of Minnesota’s largest utilities plans to be carbon-free by 2050.

Duluth-based Minnesota Power already gets half of its electricity from renewable sources as of last month. It says it will share its plan for the next 15 years with the Minnesota Public Utilities Commission. Minnesota Power has invested in wind farms and hydroelectric facilities while shutting down seven of its nine coal-operated generating units since 2013. President and CEO Bethany Owen says her company is meeting the challenge of climate change with a reliable clean energy supply while keeping costs affordable for its customers.