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Property, Plant and Equipment, Net
 3 Months Ended
Mar. 31, 2023
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,
Life20232022
Regulated assets:   
Utility generation, transmission and distribution systems
5-80 years
 $93,123  $92,759 
Interstate natural gas pipeline assets
3-80 years
 18,492  18,328 
   111,615 111,087 
Accumulated depreciation and amortization  (35,395) (34,599)
Regulated assets, net  76,220 76,488 
      
Nonregulated assets:     
Independent power plants
2-50 years
 8,514  8,545 
Cove Point LNG facility40 years3,416 3,412 
Other assets
2-30 years
 2,680  2,693 
   14,610 14,650 
Accumulated depreciation and amortization  (3,493) (3,452)
Nonregulated assets, net  11,117 11,198 
      
  87,337 87,686 
Construction work-in-progress  6,246  5,357 
Property, plant and equipment, net  $93,583 $93,043 

Construction work-in-progress includes $5.8 billion as of March 31, 2023 and $4.9 billion as of December 31, 2022, 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 Life20232022
Utility plant: 
Generation
15 - 59 years
$13,721 $13,726 
Transmission
60 - 90 years
8,063 8,051 
Distribution
20 - 75 years
8,578 8,477 
Intangible plant(1) and other
5 - 75 years
2,758 2,755 
Utility plant in-service33,120 33,009 
Accumulated depreciation and amortization (11,256)(11,093)
Utility plant in-service, net 21,864 21,916 
Nonregulated, net of accumulated depreciation and amortization
14 - 95 years
18 18 
21,882 21,934 
Construction work-in-progress 2,813 2,496 
Property, plant and equipment, net $24,695 $24,430 
(1)Computer software costs included in intangible plant are initially assigned a depreciable life of 5 to 10 years.
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 Life20232022
Utility plant:
Generation
20-62 years
$18,385 $18,582 
Transmission
55-80 years
2,672 2,662 
Electric distribution
15-80 years
4,983 4,931 
Natural gas distribution
30-75 years
2,166 2,144 
Utility plant in-service28,206 28,319 
Accumulated depreciation and amortization(8,210)(8,024)
Utility plant in-service, net19,996 20,295 
Nonregulated property, net of accumulated depreciation and amortization
20-50 years
6 6 
20,002 20,301 
Construction work-in-progress979 790 
Property, plant and equipment, net$20,981 $21,091 

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, 2023 and 2022, $20 million and $42 million, respectively, is reflected in depreciation and amortization expense on the Statement of Operations.
MidAmerican Funding, LLC  
Property, Plant and Equipment [Line Items]  
Property, Plant and Equipment, Net Property, Plant and Equipment, NetRefer to Note 3 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,
20232022
Utility plant:
Generation
30 - 55 years
$3,977 $3,977 
Transmission
45 - 70 years
1,569 1,562 
Distribution
20 - 65 years
4,189 4,134 
General and intangible plant
5 - 65 years
887 871 
Utility plant10,622 10,544 
Accumulated depreciation and amortization(3,677)(3,624)
Utility plant, net6,945 6,920 
Non-regulated, net of accumulated depreciation and amortization
45 years
1 1 
6,946 6,921 
Construction work-in-progress703 485 
Property, plant and equipment, net$7,649 $7,406 
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,
20232022
Utility plant:
Electric generation
25 - 70 years
$1,301 $1,298 
Electric transmission
50 - 76 years
995 993 
Electric distribution
20 - 76 years
1,999 1,983 
Electric general and intangible plant
5 - 65 years
221 219 
Natural gas distribution
35 - 70 years
459 455 
Natural gas general and intangible plant
5 - 65 years
16 15 
Common general
5 - 65 years
380 380 
Utility plant5,371 5,343 
Accumulated depreciation and amortization(2,024)(1,992)
3,347 3,351 
Construction work-in-progress275 236 
Property, plant and equipment, net$3,622 $3,587 

During 2022, Sierra Pacific revised its electric and gas depreciation rates effective January 2023 based on the results of a new depreciation study, the most significant impact of which was shorter average service lives for intangible software. The net effect of this change along with various changes to the average service lives of other utility plant groups will increase depreciation and amortization expense by $19 million annually based on depreciable plant balances at the time of the change.
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 Life20232022
Utility plant:
Interstate natural gas transmission and storage assets
21 - 52 years
$9,053 $8,922 
Intangible plant
5 - 18 years
116 113 
Utility plant in-service9,169 9,035 
Accumulated depreciation and amortization(3,075)(3,039)
Utility plant in-service, net6,094 5,996 
Nonutility plant:
LNG facility40 years4,526 4,522 
Intangible plant14 years25 25 
Nonutility plant4,551 4,547 
Accumulated depreciation and amortization(574)(542)
Nonutility plant, net3,977 4,005 
10,071 10,001 
Construction work-in-progress210 201 
Property, plant and equipment, net$10,281 $10,202 

Construction work-in-progress includes $192 million and $181 million as of March 31, 2023 and December 31, 2022, 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 Life20232022
Interstate natural gas transmission and storage assets
28 - 50 years
$6,842 $6,724 
Intangible plant
12 - 20 years
80 79 
Plant in-service6,922 6,803 
Accumulated depreciation and amortization(2,465)(2,440)
4,457 4,363 
Construction work-in-progress147 141 
Property, plant and equipment, net$4,604 $4,504