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Property, Plant and Equipment, Net
 12 Months Ended
Dec. 31, 2022
Property, Plant and Equipment [Line Items]  
Property, Plant and Equipment, Net Property, Plant and Equipment, Net
Property, plant and equipment, net consists of the following as of December 31 (in millions):
Depreciable Life20222021
Regulated assets:
Utility generation, transmission and distribution systems
5-80 years
$92,759 $90,223 
Interstate natural gas pipeline assets
3-80 years
18,328 17,423 
111,087 107,646 
Accumulated depreciation and amortization(34,599)(32,680)
Regulated assets, net76,488 74,966 
Nonregulated assets:
Independent power plants
2-50 years
8,545 7,665 
Cove Point LNG facility
40 years
3,412 3,364 
Other assets
2-30 years
2,693 2,666 
14,650 13,695 
Accumulated depreciation and amortization(3,452)(3,041)
Nonregulated assets, net11,198 10,654 
87,686 85,620 
Construction work-in-progress5,357 4,196 
Property, plant and equipment, net$93,043 $89,816 

Construction work-in-progress includes $4.9 billion and $3.8 billion as of December 31, 2022 and 2021, respectively, related to the construction of regulated assets.
PAC  
Property, Plant and Equipment [Line Items]  
Property, Plant and Equipment, Net Property, Plant and Equipment, Net
Property, plant and equipment, net consists of the following as of December 31 (in millions):
Depreciable Life20222021
Utility Plant:
Generation
15 - 59 years
$13,726 $13,679 
Transmission
60 - 90 years
8,051 7,894 
Distribution
20 - 75 years
8,477 8,044 
Intangible plant(1) and other
5 - 75 years
2,755 2,645 
Utility plant in-service33,009 32,262 
Accumulated depreciation and amortization(11,093)(10,507)
Utility plant in-service, net21,916 21,755 
Nonregulated, net of accumulated depreciation and amortization
14 - 95 years
18 18 
21,934 21,773 
Construction work-in-progress2,496 1,141 
Property, plant and equipment, net$24,430 $22,914 

(1)Computer software costs included in intangible plant are initially assigned a depreciable life of 5 to 10 years.

The average depreciation and amortization rate applied to depreciable property, plant and equipment was 3.5%, 3.5% and 4.1% for the years ended December 31, 2022, 2021 and 2020, respectively.

Unallocated Acquisition Adjustments

PacifiCorp has unallocated acquisition adjustments that represent the excess of costs of the acquired interests in property, plant and equipment purchased from the entity that first dedicated the assets to utility service over their net book value in those assets. These unallocated acquisition adjustments included in other property, plant and equipment had an original cost of $156 million as of December 31, 2022 and 2021, and accumulated depreciation of $144 million and $143 million as of December 31, 2022 and 2021, respectively.
MEC  
Property, Plant and Equipment [Line Items]  
Property, Plant and Equipment, Net Property, Plant and Equipment, Net
Property, plant and equipment, net consists of the following as of December 31 (in millions):
Depreciable Life20222021
Utility plant:
Generation
20-62 years
$18,582 $17,397 
Transmission
55-80 years
2,662 2,474 
Electric distribution
15-80 years
4,931 4,661 
Natural gas distribution
30-75 years
2,144 2,039 
Utility plant in-service28,319 26,571 
Accumulated depreciation and amortization(8,024)(7,376)
Utility plant in-service, net20,295 19,195 
Nonregulated property, net of accumulated depreciation and amortization
20-50 years
6 6 
20,301 19,201 
Construction work-in-progress790 1,100 
Property, plant and equipment, net$21,091 $20,301 

Nonregulated property, net consists primarily of land not recoverable for regulated utility purposes.

The average depreciation and amortization rates applied to depreciable utility plant for the years ended December 31 were as follows:
202220212020
Electric3.2 %3.3 %3.2 %
Natural gas2.9 %2.8 %2.8 %
Under a revenue sharing arrangement in Iowa, MidAmerican Energy accrues throughout the year a regulatory liability based on the extent to which its anticipated annual equity return exceeds specified thresholds, with an equal amount recorded in depreciation and amortization expense. For the years ended December 31, 2022, 2021 and 2020, $296 million, $115 million, and $— million, respectively, is reflected in depreciation and amortization expense on the Statements of Operations.
MidAmerican Funding, LLC  
Property, Plant and Equipment [Line Items]  
Property, Plant and Equipment, Net Property, Plant and Equipment, Net Refer to Note 3 of MidAmerican Energy's Notes to Financial Statements. In addition to MidAmerican Energy's property, plant and equipment, net, MidAmerican Funding had nonregulated property gross of $1 million and $1 million as of December 31, 2022 and 2021, respectively.
NPC  
Property, Plant and Equipment [Line Items]  
Property, Plant and Equipment, Net Property, Plant and Equipment, Net
Property, plant and equipment, net consists of the following as of December 31 (in millions):
Depreciable Life20222021
Utility plant:
Generation
30 - 55 years
$3,977 $3,793 
Transmission
45 - 70 years
1,562 1,503 
Distribution
20 - 65 years
4,134 3,920 
General and intangible plant
5 - 65 years
871 836 
Utility plant10,544 10,052 
Accumulated depreciation and amortization(3,624)(3,406)
Utility plant, net6,920 6,646 
Nonregulated, net of accumulated depreciation and amortization
45 years
1 1 
6,921 6,647 
Construction work-in-progress485 244 
Property, plant and equipment, net$7,406 $6,891 
Almost all of Nevada Power's plant is subject to the ratemaking jurisdiction of the PUCN and the FERC. Nevada Power's depreciation and amortization expense, as authorized by the PUCN, stated as a percentage of the depreciable property balances as of December 31, 2022, 2021 and 2020 was 3.1%, 3.2%, and 3.1%, respectively. Nevada Power is required to file a utility plant depreciation study every six years as a companion filing with the triennial general rate review filings. The most recent study was filed in 2017.

Construction work-in-progress is primarily related to the construction of regulated assets.
SPPC  
Property, Plant and Equipment [Line Items]  
Property, Plant and Equipment, Net Property, Plant and Equipment, Net
Property, plant and equipment, net consists of the following as of December 31 (in millions):
Depreciable Life20222021
Utility plant:
Electric generation
25 - 60 years
$1,298 $1,163 
Electric transmission
50 - 100 years
993 940 
Electric distribution
20 - 100 years
1,983 1,846 
Electric general and intangible plant
5 - 70 years
219 204 
Natural gas distribution
35 - 70 years
455 438 
Natural gas general and intangible plant
5 - 70 years
15 14 
Common general
5 - 70 years
380 370 
Utility plant5,343 4,975 
Accumulated depreciation and amortization(1,992)(1,854)
Utility plant, net3,351 3,121 
Construction work-in-progress236 219 
Property, plant and equipment, net$3,587 $3,340 

All of Sierra Pacific's plant is subject to the ratemaking jurisdiction of the PUCN and the FERC. Sierra Pacific's depreciation and amortization expense, as authorized by the PUCN, stated as a percentage of the depreciable property balances as of December 31, 2022, 2021 and 2020 was 3.0%, 3.1% and 3.2%, respectively. Sierra Pacific is required to file a utility plant depreciation study every six years as a companion filing with the triennial general rate review filings. The most recent study was filed in 2022.

Construction work-in-progress is primarily related to the construction of regulated assets.
EEGH  
Property, Plant and Equipment [Line Items]  
Property, Plant and Equipment, Net Property, Plant and Equipment, Net
Property, plant and equipment, net consists of the following as of December 31 (in millions):
Depreciable Life20222021
Utility Plant:
Interstate natural gas pipeline and storage assets
21 - 52 years
$8,922 $8,675 
Intangible plant
5 - 18 years
113 110 
Utility plant in-service9,035 8,785 
Accumulated depreciation and amortization(3,039)(2,901)
Utility plant in-service, net5,996 5,884 
Nonutility Plant:
LNG facility40 years4,522 4,475 
Intangible plant14 years25 25 
Nonutility plant4,547 4,500 
Accumulated depreciation and amortization(542)(423)
Nonutility plant, net4,005 4,077 
10,001 9,961 
Construction work- in-progress201 239 
Property, plant and equipment, net$10,202 $10,200 

Construction work-in-progress includes $181 million and $209 million as of December 31, 2022 and 2021, respectively, related to the construction of utility plant.
EGTS  
Property, Plant and Equipment [Line Items]  
Property, Plant and Equipment, Net Property, Plant and Equipment, Net
Property, plant and equipment, net consists of the following as of December 31 (in millions):
Depreciable Life20222021
Interstate natural gas pipeline and storage assets
28 - 50 years
$6,724 $6,517 
Intangible plant
12 - 20 years
79 74 
Plant in-service6,803 6,591 
Accumulated depreciation and amortization(2,440)(2,339)
4,363 4,252 
Construction work-in-progress141 188 
Property, plant and equipment, net$4,504 $4,440