Xcel details plans to shut 660 MW coal, build 1.8 GW renewables in Colorado

There are four major parts to Xcel's Colorado filing, with the most significant likely being the retirement of Comanche Units 1 and 2 in Pueblo, each about a decade early and capable of producing a combined 660 MW.

Under a business-as-usual scenario, the utility would have filed to develop 450 MW of new resources while continuing operations of Comanche 1 and Comanche 2. The retirement, however, means Xcel will replace the power with renewables — 1,100 MW of wind energy and 700 MW of solar. The plan also calls for energy storage: 275 MW, all to be "embedded" with solar generation.

In addition, the utility is proposing to ensure reliability by utilizing 380 MW of "existing flexible gas resources."