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Leases | 12 Months Ended
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Dec. 31, 2019
Leases [Abstract] |
Leases | Leases We lease certain land, buildings, vehicles, equipment and other property through operating rental agreements with varying terms, provisions, and expiration dates. APS also has certain purchased power agreements that qualify as lease arrangements. Our leases have remaining terms that expire in 2020 through 2050. Substantially all of our leasing activities relate to APS. In 1986, APS entered into agreements with three separate lessor trust entities in order to sell and lease back interests in Palo Verde Unit 2 and related common facilities. These lessor trust entities have been deemed VIEs for which APS is the primary beneficiary. As the primary beneficiary, APS consolidated these lessor trust entities. The impacts of these sale leaseback transactions are excluded from our lease disclosures as lease accounting is eliminated upon consolidation. See Note 19 for a discussion of VIEs. On January 1, 2019 we adopted new lease accounting guidance (see Note 3). We elected the transition method that allows us to apply the new lease guidance on the date of adoption, January 1, 2019, and will not retrospectively adjust prior periods. We also elected certain transition practical expedients that allow us to not reassess (a) whether any expired or existing contracts are or contain leases, (b) the lease classification for any expired or existing leases and (c) initial direct costs for any existing leases. These practical expedients apply to leases that commenced prior to January 1, 2019. Furthermore, we elected the practical expedient transition provisions relating to the treatment of existing land easements. On January 1, 2019 the adoption of this new accounting standard resulted in the recognition on our Consolidated Balance Sheets of approximately $194 million of right-of-use lease assets and $119 million of lease liabilities relating to our operating lease arrangements. The right-of-use lease assets include $85 million of prepaid lease costs that have been reclassified from other deferred debits, and $10 million of deferred lease costs that have been reclassified from other current liabilities. In addition to these balance sheet impacts, the adoption of the guidance resulted in expanded lease disclosures, which are included below. The following table provides information related to our lease costs (dollars in thousands):
|  | Year Ended December 31, 2019
|  | Purchased Power Lease Contracts |  | Land, Property & Equipment Leases |  | Total
Operating lease cost |  | $ | 42,190 |  |  | $ | 18,038 |  |  | $ | 60,228 |
Variable lease cost |  | 113,233 |  |  | 782 |  |  | 114,015 |
Short-term lease cost |  | — |  |  | 4,385 |  |  | 4,385 |
Total lease cost |  | $ | 155,423 |  |  | $ | 23,205 |  |  | $ | 178,628 |
Lease costs are primarily included as a component of operating expenses on our Consolidated Statements of Income. Lease costs relating to purchased power lease contracts are recorded in fuel and purchased power on the Consolidated Statements of Income, and are subject to recovery under the PSA or RES (see Note 4). The tables above reflect the lease cost amounts before the effect of regulatory deferral under the PSA and RES. Variable lease costs are recognized in the period the costs are incurred, and primarily relate to renewable purchased power lease contracts. Payments under most renewable purchased power lease contracts are dependent upon environmental factors, and due to the inherent uncertainty associated with the reliability of the fuel source, the payments are considered variable and are excluded from the measurement of lease liabilities and right-of-use lease assets. Certain of our lease agreements have lease terms with non-consecutive periods of use. For these agreements we recognize lease costs during the periods of use. Leases with initial terms of 12 months or less are considered short-term leases and are not recorded on the balance sheet. Lease disclosures relating to 2018 and 2017 are presented under prior lease accounting guidance. Lease expense recognized in the Consolidated Statements of Income was $18 million in 2018 and $18 million in 2017, these amounts do not include purchased power lease contracts. Operating lease cost for purchased power lease contracts was $47 million in 2018 and $60 million in 2017. In addition, contingent rents for purchased power lease contracts was $109 million in 2018 and $100 million in 2017. These purchased power lease costs are recorded in fuel and purchased power on the Consolidated Statements of Income, and are subject to recovery under the PSA or RES (see Note 4). The following table provides information related to the maturity of our operating lease liabilities (dollars in thousands):
|  | December 31, 2019
Year |  | Purchased Power Lease Contracts (a) |  | Land, Property & Equipment Leases |  | Total
2020 |  | $ | — |  |  | $ | 14,698 |  |  | $ | 14,698 |
2021 |  | — |  |  | 11,963 |  |  | 11,963 |
2022 |  | — |  |  | 8,331 |  |  | 8,331 |
2023 |  | — |  |  | 6,326 |  |  | 6,326 |
2024 |  | — |  |  | 4,141 |  |  | 4,141 |
Thereafter |  | — |  |  | 38,697 |  |  | 38,697 |
Total lease commitments |  | — |  |  | 84,156 |  |  | 84,156 |
Less imputed interest |  | — |  |  | 19,571 |  |  | 19,571 |
Total lease liabilities |  | $ | — |  |  | $ | 64,585 |  |  | $ | 64,585 |
(a) As of December 31, 2019, we had no operating lease liabilities relating to purchased power lease contracts. See discussion below regarding executed contracts with commencement dates beginning in June 2020. We recognize lease assets and liabilities upon lease commencement. At December 31, 2019, we have additional lease arrangements that have been executed, but have not yet commenced. These arrangements primarily relate to purchased power lease contracts. These leases have commencement dates beginning in June 2020 with terms ending through October 2027. We expect the total fixed consideration paid for these arrangements, which includes both lease and nonlease payments, will approximate $705 million over the term of the arrangements. The following table provides information related to estimated future minimum operating lease payments (dollars in thousands):
|  | December 31, 2018
Year |  | Purchased Power Lease Contracts |  | Land, Property & Equipment Leases |  | Total
2019 |  | $ | 54,499 |  |  | $ | 13,747 |  |  | $ | 68,246 |
2020 |  | — |  |  | 12,428 |  |  | 12,428 |
2021 |  | — |  |  | 9,478 |  |  | 9,478 |
2022 |  | — |  |  | 6,513 |  |  | 6,513 |
2023 |  | — |  |  | 5,359 |  |  | 5,359 |
Thereafter |  | — |  |  | 42,236 |  |  | 42,236 |
Total future lease commitments |  | $ | 54,499 |  |  | $ | 89,761 |  |  | $ | 144,260 |
The following tables provide other additional information related to operating lease liabilities:
| December 31, 2019
Weighted average remaining lease term | 13 years |
Weighted average discount rate (a) | 3.71 | %
(a) Most of our lease agreements do not contain an implicit rate that is readily determinable. For these agreements we use our incremental borrowing rate to measure the present value of lease liabilities. We determine our incremental borrowing rate at lease commencement based on the rate of interest that we would have to pay to borrow, on a collateralized basis over a similar term, an amount equal to the lease payments in a similar economic environment. We use the implicit rate when it is readily determinable.
| Year Ended December 31, 2019
Cash paid for amounts included in the measurement of lease liabilities - operating cash flows (dollars in thousands): | $ | 69,075 |

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- Definition The entire disclosure for operating leases of lessee. Includes, but is not limited to, description of operating lease and maturity analysis of operating lease liability. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -URI http://asc.fasb.org/subtopic&trid=77888251 + Details
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