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Property, Plant and Equipment
 12 Months Ended
Dec. 31, 2020
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment PROPERTY, PLANT AND EQUIPMENT
The following tables summarize the property, plant and equipment for Duke Energy and its subsidiary registrants.
December 31, 2020
Average
RemainingDukeDukeDukeDukeDuke
Useful LifeDukeEnergyProgressEnergyEnergyEnergyEnergy
(in millions)(Years)EnergyCarolinasEnergyProgressFloridaOhioIndianaPiedmont
Land $2,046 $536 $908 $463 $445 $171 $118 $279 
Plant – Regulated
Electric generation, distribution and transmission 39117,107 44,059 50,785 31,375 19,410 6,255 16,008 — 
Natural gas transmission and distribution 5410,799 — — — — 3,136 — 7,663 
Other buildings and improvements 362,038 740 459 197 262 374 300 165 
Plant – Nonregulated  
Electric generation, distribution and transmission275,444 — — — — — — — 
Other buildings and improvements 10519 — — — — — — — 
Nuclear fuel 3,284 1,837 1,447 1,447 — — — — 
Equipment 152,608 620 759 498 261 385 238 122 
Construction in process 6,645 1,645 2,013 709 1,304 407 409 581 
Other145,090 1,203 1,521 1,070 441 294 309 324 
Total property, plant and equipment(a)(e)
155,580 50,640 57,892 35,759 22,123 11,022 17,382 9,134 
Total accumulated depreciation – regulated(b)(c)
(46,216)(17,453)(18,368)(12,801)(5,560)(3,013)(5,661)(1,749)
Total accumulated depreciation – nonregulated(d)(e)
(2,611)— — — — — — — 
Generation facilities to be retired, net29 — 29 29 — — — — 
Total net property, plant and equipment $106,782 $33,187 $39,553 $22,987 $16,563 $8,009 $11,721 $7,385 
(a)    Includes finance leases of $832 million, $335 million, $416 million, $297 million, $119 million and $10 million at Duke Energy, Duke Energy Carolinas, Progress Energy, Duke Energy Progress, Duke Energy Florida and Duke Energy Indiana, respectively, primarily within Plant – Regulated. The Progress Energy, Duke Energy Progress and Duke Energy Florida amounts are net of $141 million, $24 million and $117 million, respectively, of accumulated amortization of finance leases.
(b)    Includes $1,832 million, $1,010 million, $822 million and $822 million of accumulated amortization of nuclear fuel at Duke Energy, Duke Energy Carolinas, Progress Energy and Duke Energy Progress, respectively.
(c)    Includes accumulated amortization of finance leases of $12 million, $23 million and $3 million at Duke Energy, Duke Energy Carolinas and Duke Energy Indiana, respectively.
(d)    Includes accumulated amortization of finance leases of $23 million at Duke Energy.
(e)    Includes gross property, plant and equipment cost of consolidated VIEs of $6,394 million and accumulated depreciation of consolidated VIEs of $1,242 million at Duke Energy.
In 2020, Duke Energy evaluated recoverability of its renewable merchant plants principally located in the Electric Reliability Council of Texas West market and in the PJM West market due to declining market pricing and declining long-term forecasted energy prices, primarily driven by lower forecasted natural gas prices. Duke Energy determined that the assets were not impaired because the carrying value of $210 million approximates the aggregate estimated future undiscounted cash flows. A continued decline in energy market pricing would likely result in a future impairment. Duke Energy retained 51% ownership interest in these facilities following the 2019 transaction to sell a minority interest in certain renewable assets. See Note 1 for further information.
December 31, 2019
Average
RemainingDukeDukeDukeDukeDuke
Useful LifeDukeEnergyProgressEnergyEnergyEnergyEnergy
(in millions)(Years)EnergyCarolinasEnergyProgressFloridaOhioIndianaPiedmont
Land $2,091 $520 $884 $449 $435 $150 $117 $388 
Plant – Regulated
Electric generation, distribution and transmission 39111,739 42,723 48,142 30,018 18,124 5,838 15,032 — 
Natural gas transmission and distribution 549,839 — — — — 2,892 — 6,947 
Other buildings and improvements 321,810 714 401 162 239 269 278 148 
Plant – Nonregulated  
Electric generation, distribution and transmission285,103 — — — — — — — 
Other buildings and improvements 9488 — — — — — — — 
Nuclear fuel 3,253 1,891 1,362 1,362 — — — — 
Equipment 132,313 546 665 452 213 319 205 128 
Construction in process 6,102 1,389 2,149 1,114 1,035 504 381 531 
Other134,916 1,139 1,467 1,046 411 269 292 304 
Total property, plant and equipment(a)(e)
147,654 48,922 55,070 34,603 20,457 10,241 16,305 8,446 
Total accumulated depreciation – regulated(b)(c)
(43,419)(16,525)(17,159)(11,915)(5,236)(2,843)(5,233)(1,681)
Total accumulated depreciation – nonregulated(d)(e)
(2,354)— — — — — — — 
Generation facilities to be retired, net246 — 246 246 — — — — 
Total net property, plant and equipment $102,127 $32,397 $38,157 $22,934 $15,221 $7,398 $11,072 $6,765 
(a)    Includes finance leases of $952 million, $211 million, $443 million, $308 million, $135 million, and $10 million at Duke Energy, Duke Energy Carolinas, Progress Energy, Duke Energy Progress, Duke Energy Florida and Duke Energy Indiana, respectively, primarily within Plant – Regulated. The Progress Energy, Duke Energy Progress and Duke Energy Florida amounts are net of $143 million, $17 million and $126 million, respectively, of accumulated amortization of finance leases.
(b)    Includes $1,807 million, $1,082 million, $725 million and $725 million of accumulated amortization of nuclear fuel at Duke Energy, Duke Energy Carolinas, Progress Energy and Duke Energy Progress, respectively.
(c)    Includes accumulated amortization of finance leases of $6 million, $13 million, and $3 million at Duke Energy, Duke Energy Carolinas and Duke Energy Indiana, respectively.
(d)    Includes accumulated amortization of finance leases of $20 million at Duke Energy.
(e)    Includes gross property, plant and equipment cost of consolidated VIEs of $5,747 million and accumulated depreciation of consolidated VIEs of $1,041 million at Duke Energy.
The following tables present capitalized interest, which includes the debt component of AFUDC.
Years Ended December 31,
(in millions)202020192018
Duke Energy$112 $159 $161 
Duke Energy Carolinas28 30 35 
Progress Energy17 31 51 
Duke Energy Progress12 28 26 
Duke Energy Florida5 3 25 
Duke Energy Ohio26 22 17 
Duke Energy Indiana10 26 27 
Piedmont8 26 17