Xcel has a more balanced production system than Black Hills which relies almost solely on natural gas. The addition of zero fuel cost renewables and storage will put them in better financial position for the future. Xcel has been a leader in wind, has a lot of solar, and some storage.  The Comanche III is a newer lower pollution coal plant.  Many of the other coal plants are older and can be phased out so will not leave capital assets stranded because of carbon costs.
Black Hills has a lot of new gas turbine investments which has raised rates and will leave customers exposed to whatever rate increases that natural gas might have.