How do i file a complaint against a utility in colorado? Complaints and comments regarding your utilities are to be submitted through the Public Utilities Commission (PUC). For other consumer complaints, contact the Colorado Attorney General's Office at 720-508-6000 or Toll-Free at 1-800-222-4444 or email: [email protected] What does the colorado public utilities commission do? The Public Utilities Commission serves the public interest by effectively regulating utilities and facilities so that the people of Colorado receive safe, reliable and reasonably-priced services consistent with the economic, environmental and social values of our state.Do you know who regulates utility companies in colorado? Do you know who regulates utility companies operating in Colorado? The Colorado Public Utilities Commission (PUC) serves the public interest by assuring the availability of safe, reliable, adequate and efficient electric, gas, steam and water services to utility customers at rates that are just, reasonable, and non discriminatory.How do i schedule an appointment with the colorado public utilities? You can schedule an appointment by calling 303-894-2000 or by using the link below: NOTICE: Effective January 1, 2021, PUC no longer issues Hazardous or Nuclear Materials permits. Per SB20-118, §42-20-201 and 501 C.R.S. are modified.