Colo. Rev. Stat. § 32-20-109
For any gas utility or electric utility for which the public utilities commission has developed expenditure and natural gas savings targets pursuant to section 40-3.2-103, C.R.S., or established energy saving and peak demand reduction goals pursuant to section 40-3.2-104, C.R.S., the commission shall determine the extent to which the marketing, promotional, and other efforts of the utility have contributed to energy efficiency improvements funded by the district. To the extent that the commission finds that the utility's efforts have created energy savings, the commission shall allow the utility to count the related energy savings towards compliance with the gas utility's expenditure and natural gas savings targets or with the electric utility's energy savings and peak demand reduction goals, as applicable, using any method deemed appropriate by the commission.
C.R.S. § 32-20-109