Town of Cardston The RRO rates are set by the Town of Cardston and the RRO service is provided by ENMAX Energy Corporation. ResidentialCardston RRO April 2024 ResidentialElectricity$0.12909/kWhSmall BusinessCardston RRO April 2024 CommercialElectricity$0.12397/kWh Compare retailer plans in our Cost Comparison Tool. Compare Rates Phone 403-653-5672 Toll free View Website