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Property, Plant and Equipment, Net
 3 Months Ended
Mar. 31, 2024
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 (in millions):
   As of
 Depreciable March 31, December 31,
Life20242023
Regulated assets:   
Utility generation, transmission and distribution systems
5-80 years
 $96,675  $96,195 
Interstate natural gas pipeline assets
3-80 years
 19,357  19,226 
   116,032 115,421 
Accumulated depreciation and amortization  (36,985) (36,365)
Regulated assets, net  79,047 79,056 
      
Nonregulated assets:     
Independent power plants
2-50 years
 8,518  8,484 
Cove Point LNG facility40 years3,435 3,423 
Other assets
2-30 years
 2,877  2,874 
   14,830 14,781 
Accumulated depreciation and amortization  (3,916) (3,856)
Nonregulated assets, net  10,914 10,925 
      
  89,961 89,981 
Construction work-in-progress  9,910  9,267 
Property, plant and equipment, net  $99,871 $99,248 

Construction work-in-progress includes $9.3 billion as of March 31, 2024 and $8.6 billion as of December 31, 2023, 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 (in millions):
  As of
 March 31,December 31,
Depreciable Life20242023
Utility plant: 
Generation
15 - 59 years
$13,964 $13,904 
Transmission
60 - 90 years
8,278 8,216 
Distribution
20 - 75 years
9,204 9,060 
Intangible plant and other
5 - 75 years
2,854 2,833 
Utility plant in-service34,300 34,013 
Accumulated depreciation and amortization (11,924)(11,725)
Utility plant in-service, net 22,376 22,288 
Nonregulated, net of accumulated depreciation and amortization
14 - 95 years
19 18 
22,395 22,306 
Construction work-in-progress 5,076 4,745 
Property, plant and equipment, net $27,471 $27,051 
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 (in millions):
As of
March 31,December 31,
Depreciable Life20242023
Utility plant:
Generation
20-62 years
$18,132 $18,129 
Transmission
55-80 years
2,853 2,834 
Electric distribution
15-80 years
5,352 5,288 
Natural gas distribution
30-75 years
2,317 2,294 
Utility plant in-service28,654 28,545 
Accumulated depreciation and amortization(8,018)(7,841)
Utility plant in-service, net20,636 20,704 
Nonregulated, net of accumulated depreciation and amortization
20-50 years
6 6 
20,642 20,710 
Construction work-in-progress1,443 1,260 
Property, plant and equipment, net$22,085 $21,970 
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. The annual regulatory liability accrual reduces utility plant upon final determination of the amount. For the three-month periods ended March 31, 2024 and 2023, $— million and $20 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 4 of MidAmerican Energy's Notes to Financial Statements.
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 (in millions):
As of
Depreciable LifeMarch 31,December 31,
20242023
Utility plant:
Generation
30 - 65 years
$4,511 $4,476 
Transmission
55 - 76 years
1,630 1,590 
Distribution
24 - 70 years
4,518 4,451 
Intangible plant and other
5 - 65 years
907 906 
Utility plant11,566 11,423 
Accumulated depreciation and amortization(3,926)(3,856)
Utility plant, net7,640 7,567 
Nonregulated, net of accumulated depreciation and amortization
40 years
1 1 
7,641 7,568 
Construction work-in-progress1,206 1,090 
Property, plant and equipment, net$8,847 $8,658 
During 2023, Nevada Power revised its electric and gas depreciation rates effective January 2024 based on the results of a new depreciation study, the most significant impact of which was longer lives for many production plants and other utility plant groups and shorter average service lives for intangible software. The net effect of these changes will decrease depreciation and amortization expense by $31 million annually based on depreciable plant balances at the time of the change.
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 (in millions):
As of
Depreciable LifeMarch 31,December 31,
20242023
Utility plant:
Generation
25 - 70 years
$1,314 $1,313 
Transmission
50 - 76 years
1,043 1,023 
Electric distribution
20 - 76 years
2,109 2,074 
Electric intangible plant and other
5 - 65 years
249 247 
Natural gas distribution
35 - 70 years
541 537 
Natural gas intangible plant and other
5 - 65 years
17 17 
Common other
5 - 65 years
378 376 
Utility plant5,651 5,587 
Accumulated depreciation and amortization(2,123)(2,091)
3,528 3,496 
Construction work-in-progress355 326 
Property, plant and equipment, net$3,883 $3,822 
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 (in millions):
As of
March 31,December 31,
Depreciable Life20242023
Utility plant:
Interstate natural gas transmission and storage assets
23 - 49 years
$9,353 $9,318 
Intangible plant
5 - 18 years
117 117 
Utility plant in-service9,470 9,435 
Accumulated depreciation and amortization(3,246)(3,201)
Utility plant in-service, net6,224 6,234 
Nonutility plant:
LNG facility40 years4,545 4,533 
Accumulated depreciation and amortization(686)(655)
Nonutility plant, net3,859 3,878 
10,083 10,112 
Construction work-in-progress234 231 
Property, plant and equipment, net$10,317 $10,343 

Construction work-in-progress includes $229 million and $223 million as of March 31, 2024 and December 31, 2023, 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 (in millions):
As of
March 31,December 31,
Depreciable Life20242023
Interstate natural gas transmission and storage assets
28 - 50 years
$7,060 $7,046 
Intangible plant
12 - 20 years
82 80 
Plant in-service7,142 7,126 
Accumulated depreciation and amortization(2,598)(2,563)
4,544 4,563 
Construction work-in-progress159 152 
Property, plant and equipment, net$4,703 $4,715