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Property, Plant and Equipment, Net
 9 Months Ended
Sep. 30, 2021
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 September 30, December 31,
Life20212020
Regulated assets:   
Utility generation, transmission and distribution systems
5-80 years
 $89,026  $86,730 
Interstate natural gas pipeline assets
3-80 years
 17,044  16,667 
   106,070 103,397 
Accumulated depreciation and amortization  (32,444) (30,662)
Regulated assets, net  73,626 72,735 
      
Nonregulated assets:     
Independent power plants
5-30 years
 7,058  7,012 
Other assets
3-40 years
 5,951  5,659 
   13,009 12,671 
Accumulated depreciation and amortization  (2,916) (2,586)
Nonregulated assets, net  10,093 10,085 
      
Net operating assets  83,719 82,820 
Construction work-in-progress  4,343  3,308 
Property, plant and equipment, net  $88,062 $86,128 

Construction work-in-progress includes $3.9 billion as of September 30, 2021 and $3.2 billion as of December 31, 2020, 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
 September 30,December 31,
Depreciable Life20212020
Utility Plant: 
Generation
15 - 59 years
$13,635 $12,861 
Transmission
60 - 90 years
7,833 7,632 
Distribution
20 - 75 years
7,889 7,660 
Intangible plant(1)
5 - 75 years
1,083 1,054 
Other
5 - 60 years
1,535 1,510 
Utility plant in service31,975 30,717 
Accumulated depreciation and amortization (10,370)(9,838)
Utility plant in service, net 21,605 20,879 
Other non-regulated, net of accumulated depreciation and amortization
14 - 95 years
9 9 
Plant, net21,614 20,888 
Construction work-in-progress 1,134 1,542 
Property, plant and equipment, net $22,748 $22,430 

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

Effective January 1, 2021, PacifiCorp revised its depreciation rates based on its recent depreciation study that was approved by its state regulatory commissions, other than in California. The approved depreciation rates resulted in an increase in depreciation expense of approximately $38 million for the three-month period ended September 30, 2021 as compared to the three-month period ended September 30, 2020, and $120 million for the nine-month period ended September 30, 2021 compared to the nine-month period ended September 30, 2020 based on historical property, plant and equipment balances and including depreciation of certain coal-fueled generating units in Washington over accelerated periods.
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
September 30,December 31,
Depreciable Life20212020
Utility plant in service, net:
Generation
20-70 years
$17,162 $16,980 
Transmission
52-75 years
2,415 2,365 
Electric distribution
20-75 years
4,522 4,369 
Natural gas distribution
29-75 years
2,011 1,955 
Utility plant in service26,110 25,669 
Accumulated depreciation and amortization(7,444)(6,902)
Utility plant in service, net18,666 18,767 
Nonregulated property, net:
Nonregulated property gross
20-50 years
7 7 
Accumulated depreciation and amortization(1)(1)
Nonregulated property, net
6 6 
18,672 18,773 
Construction work-in-progress1,101 506 
Property, plant and equipment, net$19,773 $19,279 
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 LifeSeptember 30,December 31,
20212020
Utility plant:
Generation
30 - 55 years
$3,780 $3,690 
Transmission
45 - 70 years
1,493 1,468 
Distribution
20 - 65 years
3,878 3,771 
General and intangible plant
5 - 65 years
810 791 
Utility plant9,961 9,720 
Accumulated depreciation and amortization(3,350)(3,162)
Utility plant, net6,611 6,558 
Other non-regulated, net of accumulated depreciation and amortization
45 years
1 1 
Plant, net6,612 6,559 
Construction work-in-progress217 142 
Property, plant and equipment, net$6,829 $6,701 
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 LifeSeptember 30,December 31,
20212020
Utility plant:
Electric generation
25 - 60 years
$1,140 $1,130 
Electric transmission
50 - 100 years
914 908 
Electric distribution
20 - 100 years
1,806 1,754 
Electric general and intangible plant
5 - 70 years
199 189 
Natural gas distribution
35 - 70 years
433 429 
Natural gas general and intangible plant
5 - 70 years
15 15 
Common general
5 - 70 years
361 355 
Utility plant4,868 4,780 
Accumulated depreciation and amortization(1,834)(1,755)
Utility plant, net3,034 3,025 
Other non-regulated, net of accumulated depreciation and amortization
70 years
— 2 
Plant, net3,034 3,027 
Construction work-in-progress231 137 
Property, plant and equipment, net$3,265 $3,164 
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
September 30,December 31,
Depreciable Life20212020
Utility Plant:
Interstate natural gas pipeline assets
24 - 43 years
$8,555 $8,382 
Intangible plant
5 - 10 years
111 115 
Utility plant in service8,666 8,497 
Accumulated depreciation and amortization(2,859)(2,759)
Utility plant in service, net5,807 5,738 
Nonutility Plant:
LNG facility40 years4,466 4,454 
Intangible plant14 years25 25 
Nonutility plant in service4,491 4,479 
Accumulated depreciation and amortization(396)(283)
Nonutility plant in service, net4,095 4,196 
Plant, net9,902 9,934 
Construction work-in-progress293 210 
Property, plant and equipment, net$10,195 $10,144 

Construction work-in-progress includes $266 million and $196 million as of September 30, 2021 and December 31, 2020, respectively, related to the construction of utility plant.