Commitments and Contingencies: Future Purchase Agreement - Related Party (Details) - MW	Sep. 11, 2020	Jul. 01, 2020	Jun. 26, 2019
Platte River Power Authority Wind Power Agreement
Unrecorded Unconditional Purchase Obligation [Line Items]
Number of Megawatts Capacity Purchased			60
Colorado Electric | City of Colorado Springs
Unrecorded Unconditional Purchase Obligation [Line Items]
Number of Megawatts Capacity Purchased		60
South Dakota Electric | Fall River Solar
Unrecorded Unconditional Purchase Obligation [Line Items]
Number of Megawatts Capacity Purchased	80
Purchase Power Agreement Set to Expire after a Certain Number of Years Following Completion of the Facility	20 years