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Regulatory Matters (Tables) | 12 Months Ended
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Dec. 31, 2016
Regulated Operations [Abstract] |
Schedule of changes in the deferred fuel and purchased power regulatory asset | The following table shows the changes in the deferred fuel and purchased power regulatory asset (liability) for 2016 and 2015 (dollars in thousands):
| Year Ended December 31,
| 2016 |  | 2015
Beginning balance | $ | (9,688 | ) |  | $ | 6,926 |
Deferred fuel and purchased power costs - current period | 60,303 |  |  | (14,997 | )
Amounts charged to customers | (38,150 | ) |  | (1,617 | )
Ending balance | $ | 12,465 |  |  | $ | (9,688 | )
Schedule of regulatory assets | The detail of regulatory assets is as follows (dollars in thousands):
S | Amortization Through |  | December 31, 2016 |  | December 31, 2015
|  |  | Current |  | Non-Current |  | Current |  | Non-Current
Pension | (a) |  | $ | — |  |  | $ | 711,059 |  |  | $ | — |  |  | $ | 619,223 |
Retired power plant costs | 2033 |  | 9,913 |  |  | 117,591 |  |  | 9,913 |  |  | 127,518 |
Income taxes - AFUDC equity | 2046 |  | 6,305 |  |  | 152,118 |  |  | 5,495 |  |  | 133,712 |
Deferred fuel and purchased power — mark-to-market (Note 16) | 2020 |  | — |  |  | 42,963 |  |  | 71,852 |  |  | 69,697 |
Four Corners cost deferral | 2024 |  | 6,689 |  |  | 56,894 |  |  | 6,689 |  |  | 63,582 |
Income taxes — investment tax credit basis adjustment | 2046 |  | 2,120 |  |  | 54,356 |  |  | 1,766 |  |  | 48,462 |
Lost fixed cost recovery | 2017 |  | 61,307 |  |  | — |  |  | 45,507 |  |  | — |
Palo Verde VIEs (Note 18) | 2046 |  | — |  |  | 18,775 |  |  | — |  |  | 18,143 |
Deferred compensation | 2036 |  | — |  |  | 35,595 |  |  | — |  |  | 34,751 |
Deferred property taxes | (d) |  | — |  |  | 73,200 |  |  | — |  |  | 50,453 |
Loss on reacquired debt | 2038 |  | 1,637 |  |  | 16,942 |  |  | 1,515 |  |  | 16,375 |
AG-1 deferral | 2018 |  | — |  |  | 5,868 |  |  | — |  |  | — |
Demand side management (b) | 2017 |  | 3,744 |  |  | — |  |  | — |  |  | — |
Tax expense of Medicare subsidy | 2024 |  | 1,513 |  |  | 10,589 |  |  | 1,520 |  |  | 12,163 |
Transmission vegetation management | 2016 |  | — |  |  | — |  |  | 4,543 |  |  | — |
Mead-Phoenix transmission line CIAC | 2050 |  | 332 |  |  | 10,708 |  |  | 332 |  |  | 11,040 |
Deferred fuel and purchased power (b) (c) | 2017 |  | 12,465 |  |  | — |  |  | — |  |  | — |
Coal reclamation | 2026 |  | 418 |  |  | 5,182 |  |  | 418 |  |  | 6,085 |
Other | Various |  | 432 |  |  | 1,588 |  |  | 5 |  |  | 2,942 |
Total regulatory assets (e) |  |  | $ | 106,875 |  |  | $ | 1,313,428 |  |  | $ | 149,555 |  |  | $ | 1,214,146 |
(a) | This asset represents the future recovery of pension benefit obligations through retail rates. If these costs are disallowed by the ACC, this regulatory asset would be charged to OCI and result in lower future revenues. See Note 7 for further discussion.
(b) | See “Cost Recovery Mechanisms” discussion above.
(c) | Subject to a carrying charge.
(d) | Per the provision of the 2012 Settlement Agreement.
(e) | There are no regulatory assets for which the ACC has allowed recovery of costs, but not allowed a return by exclusion from rate base. FERC rates are set using a formula rate as described in “Transmission Rates, Transmission Cost Adjustor and Other Transmission Matters.”
Schedule of regulatory liabilities | The detail of regulatory liabilities is as follows (dollars in thousands):
| Amortization Through |  | December 31, 2016 |  | December 31, 2015
|  |  | Current |  | Non-Current |  | Current |  | Non-Current
Asset retirement obligations | 2057 |  | $ | — |  |  | $ | 279,976 |  |  | $ | — |  |  | $ | 277,554 |
Removal costs | (a) |  | 29,899 |  |  | 223,145 |  |  | 39,746 |  |  | 240,367 |
Other postretirement benefits | (d) |  | 32,662 |  |  | 123,913 |  |  | 34,100 |  |  | 179,521 |
Income taxes — deferred investment tax credit | 2046 |  | 4,368 |  |  | 108,827 |  |  | 3,604 |  |  | 97,175 |
Income taxes - change in rates | 2045 |  | 1,771 |  |  | 70,898 |  |  | 1,113 |  |  | 72,454 |
Spent nuclear fuel | 2047 |  | — |  |  | 71,726 |  |  | 3,051 |  |  | 67,437 |
Renewable energy standard (b) | 2017 |  | 26,809 |  |  | — |  |  | 43,773 |  |  | 4,365 |
Demand side management (b) | 2019 |  | — |  |  | 20,472 |  |  | 6,079 |  |  | 19,115 |
Sundance maintenance | 2030 |  | — |  |  | 15,287 |  |  | — |  |  | 13,678 |
Deferred fuel and purchased power (b) (c) | 2016 |  | — |  |  | — |  |  | 9,688 |  |  | — |
Deferred gains on utility property | 2018 |  | 2,063 |  |  | 8,895 |  |  | 2,062 |  |  | 6,001 |
Four Corners coal reclamation | 2031 |  | — |  |  | 18,248 |  |  | — |  |  | 8,920 |
Other | Various |  | 2,327 |  |  | 7,529 |  |  | 2,550 |  |  | 7,565 |
Total regulatory liabilities |  |  | $ | 99,899 |  |  | $ | 948,916 |  |  | $ | 145,766 |  |  | $ | 994,152 |
(a) | In accordance with regulatory accounting guidance, APS accrues for removal costs for its regulated assets, even if there is no legal obligation for removal (see Note 11).
(b) | See “Cost Recovery Mechanisms” discussion above.
(c) | Subject to a carrying charge.
(d) | See Note 7.

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- Definition Tabular disclosure of assets that are created when regulatory agencies permit public utilities to defer certain costs included in rate-setting to the balance sheet. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44264-110382 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 715 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6501251&loc=d3e52485-110419 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382 + Details
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- Definition Tabular disclosure of regulatory liabilities. Detailed information about liabilities that result from rate actions of a regulator. Rate actions of a regulator can impose a liability on a regulated enterprise resulting in a regulatory liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 405 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6500807&loc=d3e48068-110394 + Details
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