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Property, Plant and Equipment (All Registrants)
 12 Months Ended
Dec. 31, 2020
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment (All Registrants) Property, Plant, and Equipment (All Registrants)
The following tables present a summary of property, plant, and equipment by asset category as of December 31, 2020 and 2019:
Asset CategoryExelonGenerationComEdPECOBGEPHIPepcoDPLACE
December 31, 2020
Electric—transmission and distribution$60,946 $— $29,371 $9,462 $8,797 $15,137 $10,264 $4,730 $4,568 
Electric—generation29,725 29,724 — — — — — — — 
Gas—transportation and distribution6,733 — — 3,098 3,315 591 — 751 — 
Common—electric and gas2,170 — — 956 1,138 178 — 180 — 
Nuclear fuel(a)
5,399 5,399 — — — — — — — 
Construction work in progress3,576 450 799 474 627 1,174 824 163 182 
Other property, plant, and equipment(b)
762 11 59 34 29 108 65 23 28 
Total property, plant, and equipment109,311 35,584 30,229 14,024 13,906 17,188 11,153 5,847 4,778 
Less: accumulated depreciation(c)
26,727 13,370 5,672 3,843 4,034 1,811 3,697 1,533 1,303 
Property, plant, and equipment, net$82,584 $22,214 $24,557 $10,181 $9,872 $15,377 $7,456 $4,314 $3,475 
December 31, 2019
Electric—transmission and distribution$56,809 $— $27,566 $8,957 $8,326 $13,809 $9,734 $4,464 $4,207 
Electric—generation29,839 29,839 — — — — — — — 
Gas—transportation and distribution6,147 — — 2,899 2,999 525 — 690 — 
Common—electric and gas1,907 — — 877 991 146 — 160 — 
Nuclear fuel(a)
5,656 5,656 — — — — — — — 
Construction work in progress3,055 702 662 250 483 921 628 125 166 
Other property, plant and equipment(b)
799 13 47 27 25 108 64 21 27 
Total property, plant and equipment104,212 36,210 28,275 13,010 12,824 15,509 10,426 5,460 4,400 
Less: accumulated depreciation(c)
23,979 12,017 5,168 3,718 3,834 1,213 3,517 1,425 1,210 
Property, plant, and equipment, net$80,233 $24,193 $23,107 $9,292 $8,990 $14,296 $6,909 $4,035 $3,190 
__________
(a)Includes nuclear fuel that is in the fabrication and installation phase of $939 million and $1,025 million at December 31, 2020 and 2019, respectively.
(b)Primarily composed of land and non-utility property.
(c)Includes accumulated amortization of nuclear fuel in the reactor core at Generation of $2,774 million and $2,867 million as of December 31, 2020 and 2019, respectively.
The following table presents the average service life for each asset category in number of years:
Average Service Life (years)
Asset CategoryExelonGenerationComEdPECOBGEPHIPepcoDPLACE
Electric - transmission and distribution5-80N/A5-805-705-805-755-755-705-65
Electric - generation1-581-58N/AN/AN/AN/AN/AN/AN/A
Gas - transportation and distribution5-80N/AN/A5-705-805-75N/A5-75N/A
Common - electric and gas4-75N/AN/A5-554-505-75N/A5-75N/A
Nuclear fuel1-81-8N/AN/AN/AN/AN/AN/AN/A
Other property, plant, and equipment1-501-1033-505020-503-5025-508-5013-15
Depreciation provisions are based on the estimated useful lives of the stations, which reflect the first renewal of the operating licenses for all of Generation's operating nuclear generating stations except for Clinton, Byron, Dresden, and Peach Bottom. Clinton depreciation provisions are based on an estimated useful life through 2027, which is the last year of the Illinois ZES. Peach Bottom depreciation provisions are based on estimated useful life of 2053 and 2054 for Unit 2 and Unit 3, respectively, which reflects the second renewal of its operating licenses. Beginning August 2020, Byron, Dresden, and Mystic depreciation provisions were based on their announced shutdown dates of September 2021, November 2021, and May 2024, respectively. See Note 3 — Regulatory Matters for additional information regarding license renewals and the Illinois ZECs and Note 7 — Early Plant Retirements for additional information on the impacts of early plant retirements.
The following table presents the annual depreciation rates for each asset category. Nuclear fuel amortization is charged to fuel expense using the unit-of-production method and not included in the below table.
Annual Depreciation Rates
ExelonGenerationComEdPECOBGEPHIPepcoDPLACE
December 31, 2020
Electric—transmission and distribution2.79 %N/A2.95 %2.31 %2.69 %2.81 %2.53 %2.85 %3.08 %
Electric—generation6.11 %6.11 %N/AN/AN/AN/AN/AN/AN/A
Gas—transportation and distribution2.14 %N/AN/A1.85 %2.56 %1.50 %N/A1.50 %N/A
Common—electric and gas7.01 %N/AN/A6.39 %7.45 %7.36 %N/A6.72 %N/A
December 31, 2019
Electric—transmission and distribution2.80 %N/A2.99 %2.36 %2.60 %2.77 %2.47 %2.86 %2.94 %
Electric—generation4.35 %4.35 %N/AN/AN/AN/AN/AN/AN/A
Gas—transportation and distribution2.04 %N/AN/A1.89 %2.30 %1.55 %N/A1.55 %N/A
Common—electric and gas7.37 %N/AN/A6.06 %8.30 %8.25 %N/A6.24 %N/A
December 31, 2018
Electric—transmission and distribution2.73 %N/A2.95 %2.35 %2.61 %2.61 %2.40 %2.77 %2.45 %
Electric—generation5.37 %5.37 %N/AN/AN/AN/AN/AN/AN/A
Gas—transportation and distribution2.07 %N/AN/A1.90 %2.36 %1.59 %N/A1.59 %N/A
Common—electric and gas6.98 %N/AN/A5.44 %8.50 %6.30 %N/A3.70 %N/A
Capitalized Interest and AFUDC (All Registrants)
The following table summarizes capitalized interest and credits to AFUDC by year:
ExelonGenerationComEdPECOBGEPHIPepcoDPLACE
December 31, 2020
Capitalized interest$22 $22 $— $— $— $— $— $— $— 
AFUDC debt and equity150 — 42 23 30 55 42 6 7 
December 31, 2019
Capitalized interest$24 $24 $— $— $— $— $— $— $— 
AFUDC debt and equity132 — 32 17 29 54 39 6 9 
December 31, 2018
Capitalized interest$31 $31 $— $— $— $— $— $— $— 
AFUDC debt and equity109 — 30 12 24 44 34 4 4 
See Note 1 — Significant Accounting Policies for additional information regarding property, plant and equipment policies. See Note 17 — Debt and Credit Agreements for additional information regarding Exelon’s, ComEd’s, PECO's, Pepco's, DPL's, and ACE’s property, plant and equipment subject to mortgage liens.