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Leases
12 Months Ended
Dec. 31, 2020
Leases [Abstract]  
Leases Leases NEP has operating leases primarily related to land use agreements for certain of its renewable energy projects. At December 31, 2020 and 2019, NEP had recorded ROU assets of approximately $42 million and $43 million, respectively, and $43 million and $41 million of operating lease liabilities, respectively. NEP’s operating lease liabilities were calculated based on a weighted average discount rate of 4.53% and 4.52% based on the incremental borrowing rate at the lease commencement date and have a weighted-average remaining lease term of 24 years and 25 years, at December 31, 2020 and 2019, respectively. Lease payments under the land use agreements, which convey exclusive use of the land during the arrangement, are either fixed based on the terms of the related lease agreement or variable primarily based on the amount of generation at the renewable energy project. NEP’s operating leases with fixed payments have expiration dates ranging from 2022 to 2046. NEP recognized approximately $3 million, $3 million, and $2 million in 2020, 2019 and 2018, respectively, of operating lease costs associated with its ROU assets and which are included in O&M expenses in NEP’s consolidated statements of income (loss). In addition, approximately $6 million, $7 million and $5 million was recorded related to variable lease costs in 2020, 2019 and 2018, respectively. Short-term lease expense, which is included in O&M expenses, was not material to NEP’s consolidated statements of income (loss) for the periods presented. At December 31, 2020, NEP's lease agreements call for fixed payments of approximately $3 million annually over the next five years and $53 million thereafter.