Regulatory Matters (Tables)

12 Months Ended

Dec. 31, 2022

Schedule Of Regulatory Assets and Liabilities [Line Items]

Schedule of Regulatory Assets

Regulatory assets represent costs that are expected to be recovered in future regulated rates. The Company's regulatory assets reflected on the Consolidated Balance Sheets consist of the following as of December 31 (in millions):

	Weighted
	Average
	Remaining Life	2022		2021
Deferred net power costs	1 year	$	1,478	$	531
Asset retirement obligations	15 years	835		742
Employee benefit plans(1)	14 years	490		472
Deferred income taxes(2)	Various	373		342
Asset disposition costs	Various	231		285
Demand side management	10 years	224		211
Levelized depreciation	28 years	151		135
Unrealized losses on regulated derivative contracts	1 year	112		157
Environmental costs	30 years	111		108
Wildfire mitigation and vegetation management costs	Various	111		21
Deferred operating costs	10 years	83		103
Other	Various	863		856
Total regulatory assets		$	5,062	$	3,963
Reflected as:
Current assets		$	1,319	$	544
Noncurrent assets		3,743		3,419
Total regulatory assets		$	5,062	$	3,963

(1)Includes amounts not yet recognized as a component of net periodic benefit cost that are expected to be included in regulated rates when recognized.

(2)Amounts primarily represent income tax benefits related to certain property-related basis differences and other various differences that were previously passed on to customers and will be included in regulated rates when the temporary differences reverse.

Schedule of Regulatory Liabilities

The Company's regulatory liabilities reflected on the Consolidated Balance Sheets consist of the following as of December 31 (in millions):

	Weighted
	Average
	Remaining Life	2022		2021
Deferred income taxes(1)	Various	$	2,901	$	3,185
Cost of removal(2)	27 years	2,578		2,424
Revenue sharing mechanisms	2 years	426		188
Unrealized gains on regulated derivative contracts	1 year	343		86
Asset retirement obligations	31 years	250		345
Levelized depreciation	28 years	245		259
Employee benefit plans(3)	Various	180		243
Other	Various	446		484
Total regulatory liabilities		$	7,369	$	7,214
Reflected as:
Current liabilities		$	299	$	254
Noncurrent liabilities		7,070		6,960
Total regulatory liabilities		$	7,369	$	7,214

(1)Amounts primarily represent income tax liabilities related to the federal tax rate change from 35% to 21% that are probable to be passed on to customers, offset by income tax benefits related to certain property-related basis differences and other various differences that were previously passed on to customers and will be included in regulated rates when the temporary differences reverse.

(2)Amounts represent estimated costs, as accrued through depreciation rates and exclusive of ARO liabilities, of removing regulated property, plant and equipment in accordance with accepted regulatory practices. Amounts are deducted from rate base or otherwise accrue a carrying cost.

(3)Includes amounts not yet recognized as a component of net periodic benefit cost that are expected to be returned to customers in future periods when recognized.

PAC

Schedule Of Regulatory Assets and Liabilities [Line Items]

Schedule of Regulatory Assets

Regulatory assets represent costs that are expected to be recovered in future rates. PacifiCorp's regulatory assets reflected on the Consolidated Balance Sheets consist of the following as of December 31 (in millions):

	Weighted
	Average
	Remaining
	Life	2022		2021
Employee benefit plans(1)	16 years	$	290	$	286
Utah mine disposition(2)	Various	115		116
Unamortized contract values	1 year	18		36
Deferred net power costs	2 years	546		151
Environmental costs	30 years	111		108
Asset retirement obligation	29 years	275		241
Demand side management (DSM)	10 years	224		211
Wildfire mitigation and vegetation management costs	Various	111		21
Other	Various	190		182
Total regulatory assets		$	1,880	$	1,352
Reflected as:
Current assets		$	275	$	65
Noncurrent assets		1,605		1,287
Total regulatory assets		$	1,880	$	1,352

(1)Represents amounts not yet recognized as a component of net periodic benefit cost that are expected to be included in rates when recognized.

(2)Amounts represent regulatory assets established as a result of the Utah mine disposition in 2015 for the United Mine Workers of America ("UMWA") 1974 Pension Plan withdrawal and closure costs incurred to date considered probable of recovery.

Schedule of Regulatory Liabilities

Regulatory liabilities represent income to be recognized or amounts to be returned to customers in future periods. PacifiCorp's regulatory liabilities reflected on the Consolidated Balance Sheets consist of the following as of December 31 (in millions):

	Weighted
	Average
	Remaining
	Life	2022		2021
Cost of removal(1)	26 years	$	1,332	$	1,187
Deferred income taxes(2)	Various	1,164		1,307
Unrealized gain on regulated derivatives	1 year	270		53
Other	Various	173		221
Total regulatory liabilities		$	2,939	$	2,768
Reflected as:
Current liabilities		$	96	$	118
Noncurrent liabilities		2,843		2,650
Total regulatory liabilities		$	2,939	$	2,768

(1)Amounts represent estimated costs, as generally accrued through depreciation rates, of removing property, plant and equipment in accordance with accepted regulatory practices. Amounts are deducted from rate base or otherwise accrue a carrying cost.

(2)Amounts primarily represent income tax liabilities related to the federal tax rate change from 35% to 21% that are probable of being passed on to customers, partially offset by income tax benefits related to certain property-related basis differences and other various differences that were previously passed on to customers and will be included in regulated rates when the temporary differences reverse.

MEC

Schedule Of Regulatory Assets and Liabilities [Line Items]

Schedule of Regulatory Assets

Regulatory assets represent costs that are expected to be recovered in future regulated rates. MidAmerican Energy's regulatory assets reflected on the Balance Sheets consist of the following as of December 31 (in millions):

	Weighted
	Average
	Remaining Life	2022		2021
Asset retirement obligations(1)	9 years	$	469	$	393
Employee benefit plans(2)	15 years	47		42
Other	Various	34		38
Total		$	550	$	473

(1)Amount predominantly relates to AROs for fossil-fueled and wind-powered generating facilities. Refer to Note 11 for a discussion of AROs.

(2)Represents amounts not yet recognized as a component of net periodic benefit cost that are expected to be included in regulated rates when recognized.

Schedule of Regulatory Liabilities

Regulatory liabilities represent amounts expected to be returned to customers in future periods. MidAmerican Energy's regulatory liabilities reflected on the Balance Sheets consist of the following as of December 31 (in millions):

	Weighted
	Average
	Remaining Life	2022		2021
Cost of removal(1)	29 years	$	392	$	394
Iowa electric revenue sharing(2)	1 year	312		115
Asset retirement obligations(3)	31 years	247		341
Deferred income taxes(4)	Various	72		83
Pre-funded AFUDC on transmission MVPs(5)	57 years	34		34
Unrealized gain on regulated derivative contracts	1 year	31		26
Employee benefit plans(6)	N/A	—		55
Other	Various	31		32
Total		$	1,119	$	1,080

(1)Amounts represent estimated costs, as accrued through depreciation rates and exclusive of ARO liabilities, of removing utility plant in accordance with accepted regulatory practices. Amounts are deducted from rate base or otherwise accrue a carrying cost.

(2)Represents current-year accruals under a regulatory arrangement in Iowa in which equity returns exceeding specified thresholds reduce utility plant upon final determination.

(3)Amount represents the excess of nuclear decommission trust assets over the related ARO. Refer to Note 11 for a discussion of AROs.

(4)Amounts primarily represent income tax liabilities primarily related to the federal tax rate change from 35% to 21% that are probable to be passed on to customers, offset by income tax benefits related to state accelerated tax depreciation and certain property-related basis differences that were previously passed on to customers and will be included in regulated rates when the temporary differences reverse.

(5)Represents AFUDC accrued on transmission MVPs that is deducted from rate base as a result of the inclusion of related construction work-in-progress in rate base.

(6)Represents amounts not yet recognized as a component of net periodic benefit cost that are to be returned to customers in future periods when recognized.

NPC

Schedule Of Regulatory Assets and Liabilities [Line Items]

Schedule of Regulatory Assets

Regulatory assets represent costs that are expected to be recovered in future rates. Nevada Power's regulatory assets reflected on the Consolidated Balance Sheets consist of the following as of December 31 (in millions):

	Weighted
	Average
	Remaining Life	2022		2021
Deferred energy costs	1 year	654		273
Decommissioning costs	3 years	116		169
Merger costs from 1999 merger	22 years	105		110
Unrealized loss on regulated derivative contracts	1 year	75		117
Asset retirement obligations	5 years	69		73
Deferred operating costs	13 years	67		93
Other	Various	208		184
Total regulatory assets		$	1,294	$	1,019
Reflected as:
Current assets		$	666	$	291
Noncurrent assets		628		728
Total regulatory assets		$	1,294	$	1,019

Schedule of Regulatory Liabilities

Regulatory liabilities represent amounts that are expected to be returned to customers in future periods. Nevada Power's regulatory liabilities reflected on the Consolidated Balance Sheets consist of the following as of December 31 (in millions):

	Weighted
	Average
	Remaining Life	2022		2021
Deferred income taxes(1)	Various	$	560	$	603
Cost of removal(2)	31 years	358		348
Earning sharing mechanism	4 years	114		73
Other	Various	106		125
Total regulatory liabilities		$	1,138	$	1,149
Reflected as:
Current liabilities		$	45	$	49
Noncurrent liabilities		1,093		1,100
Total regulatory liabilities		$	1,138	$	1,149

(1)Amounts primarily represent income tax liabilities related to the federal tax rate change from 35% to 21% that are probable to be passed on to customers, offset by income tax benefits related to accelerated tax depreciation and certain property-related basis differences that were previously passed on to customers and will be included in regulated rates when the temporary differences reverse.

(2)Amounts represent estimated costs, as accrued through depreciation rates and exclusive of ARO liabilities, of removing regulated property, plant and equipment in accordance with accepted regulatory practices.

SPPC

Schedule Of Regulatory Assets and Liabilities [Line Items]

Schedule of Regulatory Assets

Regulatory assets represent costs that are expected to be recovered in future rates. Sierra Pacific's regulatory assets reflected on the Consolidated Balance Sheets consist of the following as of December 31 (in millions):

	Weighted
	Average
	Remaining Life	2022		2021
Deferred energy costs	1 year	$	277	$	107
Natural disaster protection plan	1 year	69		62
Merger costs from 1999 merger	24 years	63		66
Employee benefit plans(1)	8 years	57		46
Deferred operating costs	7 years	35		31
Unrealized loss on regulated derivative contracts	1 year	21		35
Other	Various	89		93
Total regulatory assets		$	611	$	440
Reflected as:
Current assets		$	357	$	177
Noncurrent assets		254		263
Total regulatory assets		$	611	$	440

(1)Represents amounts not yet recognized as a component of net periodic benefit cost that are expected to be included in regulated rates when recognized.

Schedule of Regulatory Liabilities

Regulatory liabilities represent amounts that are expected to be returned to customers in future periods. Sierra Pacific's regulatory liabilities reflected on the Consolidated Balance Sheets consist of the following as of December 31 (in millions):

	Weighted
	Average
	Remaining Life	2022		2021
Deferred income taxes(1)	Various	$	223	$	234
Cost of removal(2)	35 years	200		201
Other	Various	32		28
Total regulatory liabilities		$	455	$	463
Reflected as:
Current liabilities		$	19	$	19
Noncurrent liabilities		436		444
Total regulatory liabilities		$	455	$	463

(1)Amounts primarily represent income tax liabilities related to the federal tax rate change from 35% to 21% that are probable to be passed on to customers, offset by income tax benefits related to accelerated tax depreciation and certain property-related basis differences and other various differences that were previously passed on to customers and will be included in regulated rates when the temporary differences reverse.

(2)Amounts represent estimated costs, as accrued through depreciation rates and exclusive of ARO liabilities, of removing regulated property, plant and equipment in accordance with accepted regulatory practices.

EEGH

Schedule Of Regulatory Assets and Liabilities [Line Items]

Schedule of Regulatory Assets

Eastern Energy Gas' regulatory assets reflected on the Consolidated Balance Sheets consist of the following as of December 31 (in millions):

	Weighted Average Remaining Life	2022		2021
Employee benefit plans(1)	11 years	$	32	$	62
Other	Various	16		12
Total regulatory assets		$	48	$	74
Reflected as:
Other current assets		$	8	$	6
Other assets		40		68
Total regulatory assets		$	48	$	74

(1)Represents costs expected to be recovered through future rates generally over the expected remaining service period of plan participants by certain rate-regulated subsidiaries.

Schedule of Regulatory Liabilities

Eastern Energy Gas' regulatory liabilities reflected on the Consolidated Balance Sheets consist of the following as of December 31 (in millions):

	Weighted Average Remaining Life	2022		2021
Income taxes refundable through future rates(1)	Various	$	406	$	468
Other postretirement benefit costs(2)	Various	123		116
Provision for rate refunds(3)		90		—
Cost of removal(4)	53 years	82		73
Other	Various	21		28
Total regulatory liabilities		$	722	$	685
Reflected as:
Current liabilities		$	126	$	40
Noncurrent liabilities		596		645
Total regulatory liabilities		$	722	$	685

(1)Amounts primarily represent income tax liabilities related to the federal tax rate change from 35% to 21% that are probable to be passed on to customers, offset by income tax benefits related to certain property-related basis differences and other various differences that were previously passed on to customers and will be included in regulated rates when the temporary differences reverse.

(2)Reflects a regulatory liability for the collection of postretirement benefit costs allowed in rates in excess of expense incurred.

(3)Reflects amounts expected to be refunded to customers in late February 2023 in connection with the EGTS rate case. See below for more information.

(4)Amounts represent estimated costs, as accrued through depreciation rates and exclusive of ARO liabilities, of removing regulated property, plant and equipment in accordance with accepted regulatory practices. Refer to Note 11 for more information.

EGTS

Schedule Of Regulatory Assets and Liabilities [Line Items]

Schedule of Regulatory Assets

Regulatory assets represent costs that are expected to be recovered in future regulated rates. EGTS' regulatory assets reflected on the Consolidated Balance Sheets consist of the following as of December 31 (in millions):

	Weighted Average Remaining Life	2022		2021
Employee benefit plans(1)	11 years	$	31	$	58
Other	Various	8		6
Total regulatory assets		$	39	$	64
Reflected as:
Current assets		$	5	$	2
Noncurrent assets		34		62
Total regulatory assets		$	39	$	64

(1)Represents costs expected to be recovered through future rates generally over the expected remaining service period of plan participants.

Schedule of Regulatory Liabilities

Regulatory liabilities represent income to be recognized or amounts expected to be returned to customers in future periods. EGTS' regulatory liabilities reflected on the Consolidated Balance Sheets consist of the following as of December 31 (in millions):

	Weighted Average Remaining Life	2022		2021
Income taxes refundable through future rates(1)	Various	$	382	$	391
Other postretirement benefit costs(2)	Various	123		116
Provision for rate refunds(3)		90		—
Cost of removal(4)	53 years	24		16
Other	Various	8		9
Total regulatory liabilities		$	627	$	532
Reflected as:
Current liabilities		$	109	$	25
Noncurrent liabilities		518		507
Total regulatory liabilities		$	627	$	532

(1)Amounts primarily represent income tax liabilities related to the federal tax rate change from 35% to 21% that are probable to be passed on to customers, offset by income tax benefits related to certain property-related basis differences and other various differences that were previously passed on to customers and will be included in regulated rates when the temporary differences reverse.

(2)Reflects a regulatory liability for the collection of postretirement benefit costs allowed in rates in excess of expense incurred.

(3)Reflects amounts expected to be refunded to customers in late February 2023 in connection with the EGTS rate case. See below for more information.

(4)Amounts represent estimated costs, as accrued through depreciation rates and exclusive of ARO liabilities, of removing regulated property, plant and equipment in accordance with accepted regulatory practices. Refer to Note 12 for more information.