Rates for Rocky Mountain Power customers could increase 3.9% with proposed cost shift

Rocky Mountain Power is asking state regulators for authority to shift variable net power supply costs from a temporary rate mechanism into permanent base rates. If approved, the shift would result in an average 3.9 percent increase to base rates, 2.7 percent for residential customers. The monthly bill for a residential customer using the company’s average of 801 kilowatt-hours per month would increase by about $2.35