4 Colo. Code Regs. § 723-4-4600
Rules 4601 through 4609 are used by LDCs to revise gas rates on an expedited basis. These rules provide instructions for the filing of: gas cost adjustment applications; annual gas purchase plan submittals; and annual gas purchase reports. The purpose of the Gas Cost Adjustment is to enable LDCs, on an expedited basis, to reflect in their rates for gas sales and gas transportation services, as applicable, the increases or decreases in gas costs, including (but not limited to) gas commodity costs and upstream services costs. The purpose of the Gas Purchase Plan is to describe the LDC's plan for purchases of gas commodity and upstream services in order to meet the forecasted demand for sales gas service during each month of the gas purchase year. The purpose of the Gas Purchase Report is to present the LDC's actual purchases of gas commodity and upstream services during each month of the gas purchase year.
4 CCR 723-4-4600