DENVER (AP) — Colorado's largest electrical utility said Tuesday it is considering shutting down two coal-fired generating units a decade earlier than planned and replacing them with power from a mix of wind, solar and natural gas.

Xcel Energy said the plan calls for closing two older units at the Comanche Generating Station in Pueblo — one in 2022 and one in 2025. A third, newer unit would keep operating.

Xcel said it would not put the plan in place unless the overall cost of electricity is the same or less than current costs.

David Eves, president of Colorado operations for the Minneapolis-b...