Fuel Mix Disclosure

August 09, 2023


In January 1999, the Colorado Public Utility Commission (PUC) adopted regulations requiring the state's utilities to disclose information regarding their fuel mix to retail customers. Utilities are required to provide this information as a bill insert or as a separate mailing twice annually, in April and October of every year. The PUC provides a suggested format for the disclosure. Fuel mix percentages are to be based on the power supply mix for the previous calendar year. Supporting documentation concerning the calculations used to determine the power supply mix percentages must be submitted to the PUC for approval.

Program Overview

Implementing Sector: State
Category: Regulatory Policy
State: Colorado
Incentive Type: Generation Disclosure
Web Site:
Start Date:
Eligible Renewable/Other Technologies:
Fuel Mix: Must be disclosed
Emissions: Not addressed
Distribution and Frequency: Distributed to customers as bill insert or separate mailing twice annually
Standard Format Required: Yes


Name: 4 CCR 723-3-3406
Date Enacted: 01/01/1999


Name: Section Chief
Organization: Colorado Public Utilities Commission
Address: 1560 Broadway, Suite 250
Denver CO 80202
Phone: (303) 894-2000

This information is sourced from DSIRE; the most comprehensive source of information on incentives and policies that support renewables and energy efficiency in the United States. Established in 1995, DSIRE is operated by the N.C. Clean Energy Technology Center at N.C. State University.