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

12 Months Ended

Dec. 31, 2018

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, 2018 (in thousands):

	Gross Plant		Accumulated Depreciation			Net Plant
Nuclear production	$	1,024,771	$	(358,606	)	$	666,165
Steam and other	1,007,526		(237,018		)	770,508
Total production	2,032,297		(595,624		)	1,436,673
Transmission	557,255		(270,888		)	286,367
Distribution	1,257,509		(389,502		)	868,007
General	232,278		(73,997		)	158,281
Intangible	102,070		(61,255		)	40,815
Total	$	4,181,409	$	(1,391,266	)	$	2,790,143

Schedule of Jointly Owned Utility Plants

A summary of the Company’s investment in jointly-owned utility plant, excluding fuel inventories, at December 31, 2018 and 2017 is as follows (in thousands):

	December 31, 2018						December 31, 2017
	Palo Verde			Other (a)			Palo Verde			Other (a)
Electric plant in service	$	1,024,771		$	94,155		$	994,075		$	97,603
Accumulated depreciation	(358,606		)	(75,096		)	(338,699		)	(72,822		)
Construction work in progress	44,719			1,511			40,946			1,014
Total	$	710,884		$	20,570		$	696,322		$	25,795

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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):

2016	$	5,302
2017	6,409
2018	7,297
2019 (estimated)	7,263
2020 (estimated)	6,867
2021 (estimated)	5,934
2022 (estimated)	5,047
2023 (estimated)	4,070

Company Share of Recovered Costs

Costs Recovery Period	Amount Refunded		Amount Credited to Customers through Fuel Adjustment Clauses		Period Credited to Customers
July 2016 - June 2017	$	1,413	$	1,121	March 2018
July 2015 - June 2016	1,779		1,432		March 2017
July 2014 - June 2015	1,884		1,581		March 2016

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,
2018		2017		2016
$	96,454	$	99,364	$	96,914