Utility Plant, Palo Verde and Other Jointly-Owned Utility Plant (Tables)

12 Months Ended

Dec. 31, 2019

Jointly Owned Utility Plant Interests [Line Items]

Schedule of Property, Plant and Equipment and Finite-Lived Intangible Assets By Major Class

The table below presents the balance of each major class of depreciable assets at December 31, 2019 (in thousands):

	Gross Plant		Accumulated Depreciation			Net Plant
Nuclear production	$	1,062,849	$	(380,068	)	$	682,781
Steam and other	1,047,243		(251,827		)	795,416
Total production	2,110,092		(631,895		)	1,478,197
Transmission	577,758		(277,792		)	299,966
Distribution	1,363,300		(403,410		)	959,890
General	240,455		(78,932		)	161,523
Intangible	112,545		(69,356		)	43,189
Total	$	4,404,150	$	(1,461,385	)	$	2,942,765

Schedule of Jointly Owned Utility Plants

A summary of the Company’s investment in jointly-owned utility plant, excluding fuel inventories, at December 31, 2019 and 2018 is as follows (in thousands):

	December 31, 2019						December 31, 2018
	Palo Verde			Other (a)			Palo Verde			Other (a)
Electric plant in service	$	1,062,849		$	98,594		$	1,024,771		$	94,155
Accumulated depreciation	(380,068		)	(77,390		)	(358,606		)	(75,096		)
Construction work in progress	42,429			532			44,719			1,511
Total	$	725,210		$	21,736		$	710,884		$	20,570

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(a) Includes three jointly-owned transmission lines.

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense

The table below presents the actual and estimated amortization expense for intangible plant for the previous three years and for the next five years (in thousands):

            

2017	$	6,409
2018	7,297
2019	8,101
2020 (estimated)	8,403
2021 (estimated)	7,667
2022(estimated)	7,063
2023 (estimated)	6,245
2024 (estimated)	4,152

Company Share of Recovered Costs

Costs Recovery Period	Amount Refunded		Amount Credited to Customers through Fuel Adjustment Clauses		Period Credited to Customers
July 2017 - June 2018	$	1,604	$	1,005	June 2019
July 2016 - June 2017	1,413		1,121		March 2018
July 2015 - June 2016	1,779		1,432		March 2017

Palo Verde Generation Station

Jointly Owned Utility Plant Interests [Line Items]

Schedule of Jointly Owned Utility Plants

Palo Verde O&M Expense. Included in other O&M expenses are expenses associated with Palo Verde as follows (in thousands):

Years Ended December 31,
2019		2018		2017
$	95,525	$	96,454	$	99,364