Asset Retirement Obligations (Tables)

12 Months Ended

Dec. 31, 2021

Asset Retirement Obligations Disclosure [Line Items]

Summary of Asset Retirement Obligations By Type

The following table presents the Company's ARO liabilities by asset type as of December 31 (in millions):

	2021		2020
Fossil fuel facilities	$	466	$	529
Quad Cities Station	427		376
Wind generating facilities	299		273
Solar generating facilities	25		24
Offshore pipeline facilities	14		16
Other	109		123
Total asset retirement obligations	$	1,340	$	1,341
Quad Cities Station nuclear decommissioning trust funds	$	768	$	676

Reconciliation of Asset Retirement Obligation

The following table reconciles the beginning and ending balances of the Company's ARO liabilities for the years ended December 31 (in millions):

	2021		2020
Beginning balance	$	1,341	$	1,272
Change in estimated costs	81		46
Acquisitions	—		122
Additions	15		51
Retirements	(144)		(201)
Accretion	47		51
Ending balance	$	1,340	$	1,341
Reflected as:
Other current liabilities	$	130	$	184
Other long-term liabilities	1,210		1,157
Total ARO liability	$	1,340	$	1,341

PAC

Asset Retirement Obligations Disclosure [Line Items]

Reconciliation of Asset Retirement Obligation

The following table reconciles the beginning and ending balances of PacifiCorp's ARO liabilities for the years ended December 31 (in millions):

	2021		2020
Beginning balance	$	270	$	257
Change in estimated costs	40		(11)
Additions	—		25
Retirements	(15)		(10)
Accretion	9		9
Ending balance	$	304	$	270
Reflected as:
Other current liabilities	$	5	$	13
Other long-term liabilities	299		257
	$	304	$	270

MEC

Asset Retirement Obligations Disclosure [Line Items]

Summary of Asset Retirement Obligations By Type

The following table presents MidAmerican Energy's ARO liabilities by asset type as of December 31 (in millions):

	2021		2020
Quad Cities Station	$	427	$	376
Fossil-fueled generating facilities	161		255
Wind-powered generating facilities	197		185
Other	2		2
Total asset retirement obligations	$	787	$	818
Quad Cities Station nuclear decommissioning trust funds(1)	$	768	$	676

(1)Refer to Note 6 for a discussion of the Quad Cities Station nuclear decommissioning trust funds.

Reconciliation of Asset Retirement Obligation

The following table reconciles the beginning and ending balances of MidAmerican Energy's ARO liabilities for the years ended December 31 (in millions):

	2021		2020
Beginning balance	$	818	$	839
Change in estimated costs	35		47
Additions	6		23
Retirements	(103)		(124)
Accretion	31		33
Ending balance	$	787	$	818
Reflected as:
Other current liabilities	$	73	$	109
Asset retirement obligations	714		709
	$	787	$	818

NPC

Asset Retirement Obligations Disclosure [Line Items]

Summary of Asset Retirement Obligations By Type

The following table presents Nevada Power's ARO liabilities by asset type as of December 31 (in millions):

	2021		2020
Waste water remediation	$	37	$	36
Evaporative ponds and dry ash landfills	13		13
Solar	3		3
Other	15		20
Total asset retirement obligations	$	68	$	72

Reconciliation of Asset Retirement Obligation

The following table reconciles the beginning and ending balances of Nevada Power's ARO liabilities for the years ended December 31 (in millions):

	2021		2020
Beginning balance	$	72	$	74
Change in estimated costs	—		9
Retirements	(6)		(14)
Accretion	2		3
Ending balance	$	68	$	72
Reflected as:
Other current liabilities	$	19	$	25
Other long-term liabilities	49		47
	$	68	$	72

SPPC

Asset Retirement Obligations Disclosure [Line Items]

Summary of Asset Retirement Obligations By Type

The following table presents Sierra Pacific's ARO liabilities by asset type as of December 31 (in millions):

	2021		2020
Asbestos	$	5	$	5
Evaporative ponds and dry ash landfills	3		3
Other	3		3
Total asset retirement obligations	$	11	$	11

Reconciliation of Asset Retirement Obligation

The following table reconciles the beginning and ending balances of Sierra Pacific's ARO liabilities for the years ended December 31 (in millions):

	2021		2020
Beginning balance	$	11	$	10
Accretion	—		1
Ending balance	$	11	$	11
Reflected as -
Other long-term liabilities	$	11	$	11

EEGH

Asset Retirement Obligations Disclosure [Line Items]

Reconciliation of Asset Retirement Obligation

The following table reconciles the beginning and ending balances of Eastern Energy Gas' ARO liabilities for the years ended December 31 (in millions):

	2021		2020
Beginning balance	$	71	$	89
Change in estimated costs	—		(51)
Additions	—		48
Retirements	(17)		(3)
Disposal of Questar Pipeline Group	—		(16)
Accretion	1		4
Ending balance	$	55	$	71
Reflected as:
Current liabilities	$	33	$	36
Other long-term liabilities	22		35
Total ARO liability	$	55	$	71