"Last month’s ruling by the Public Utilities Commission, which targets the “social cost” of carbon emissions, won’t cost Xcel Energy and its subsidiary, the Public Service Company of Colorado, anything out of pocket, other than some additional number-crunching. And it won’t show up as a charge on the bills that consumers pay each month."

Um, what they mean is it won't cost them anything YET.  Because the surcharges don't start until 2022.

If they're going to do this, then they should also be adding the cost of "idled" conventional power generation facilities to inconsistent/undependable sources (wind/solar).  That's a huge hidden cost of wind and solar that's rarely accounted for.  In other words, to use wind or solar, it's the cost of that source PLUS a portion of the cost of that natural gas plant that has to be there to back up wind/solar when the wind doesn't blow and the sun doesn't shine.