XML 103 R38.htm IDEA: XBRL DOCUMENT v3.25.0.1
Property And Plant, Net (Tables)
12 Months Ended
Dec. 31, 2024
Property, Plant and Equipment [Abstract]  
Schedule Of Property And Plant, Net
The following table presents components of “Property, plant, and equipment, net” at December 31, 2024 and 2023:
Ameren
Missouri
Ameren
Illinois
OtherAmeren
2024
Property, plant, and equipment at original cost(a):
Electric generation:
Coal(b)
$3,556 $ $ $3,556 
Natural gas938   938 
Nuclear5,931   5,931 
Renewable(c)
2,901 19  2,920 
Electric distribution9,469 8,160  17,629 
Electric transmission2,406 5,725 2,031 10,162 
Natural gas776 4,421  5,197 
Other(d)
2,427 1,770 260 4,457 
28,404 20,095 2,291 50,790 
Less: Accumulated depreciation and amortization10,875 5,184 436 16,495 
17,529 14,911 1,855 34,295 
Construction work in progress:
Nuclear fuel in progress268   268 
Other991 619 131 1,741 
Property, plant, and equipment, net$18,788 $15,530 $1,986 $36,304 
2023
Property, plant, and equipment at original cost(a):
Electric generation:
Coal(b)
$3,452 $— $— $3,452 
Natural gas921 — — 921 
Nuclear5,879 — — 5,879 
Renewable(c)
1,973 11 — 1,984 
Electric distribution8,638 7,820 — 16,458 
Electric transmission2,134 5,381 1,993 9,508 
Natural gas688 4,186 — 4,874 
Other(d)
2,191 1,657 255 4,103 
25,876 19,055 2,248 47,179 
Less: Accumulated depreciation and amortization(f)
10,243 4,783 400 15,426 
15,633 14,272 1,848 31,753 
Construction work in progress:
Nuclear fuel in progress173 — — 173 
Other914 360 46 1,320 
Plant to be abandoned, net(e)
530 — — 530 
Property, plant, and equipment, net$17,250 $14,632 $1,894 $33,776 
(a)The estimated lives for each asset group are as follows: 5 to 72 years for electric generation, excluding Ameren Missouri’s hydroelectric generating assets, which have useful lives of up to 150 years; 20 to 80 years for electric distribution; 50 to 75 years for electric transmission; 20 to 80 years for natural gas; and 2 to 55 years for other.
(b)Includes $30 million and $29 million of oil-fired generation at December 31, 2024 and 2023, respectively.
(c)Renewable includes hydroelectric, wind, solar, and methane gas generation facilities.
(d)Other property, plant, and equipment includes assets used to support electric and natural gas services.
(e)Represents the net book value of the Rush Island Energy Center as Ameren Missouri retired the energy center in October 2024, significantly in advance of its previously expected useful life. See Plant to be Abandoned, Net under Note 1 – Summary of Significant Accounting Policies, NSR and Clean Air Act Litigation under Note 14 – Commitments and Contingencies, and Securitization of Rush Island Energy Center Costs under Note 2 – Rate and Regulatory Matters for additional information on the accelerated retirement of the Rush Island Energy Center.
Schedule of Capitalized Software and Deferred Cloud Implementation Costs
Capitalized software costs are classified within “Property, Plant, and Equipment, Net” on the balance sheet and are amortized on a straight-line basis over the expected period of benefit, ranging from 2 to 15 years, with the amortization expense included in “Depreciation and amortization” on the statement of income. Deferred cloud implementation costs are classified within “Other Assets” on the balance sheet and are amortized on a straight-line basis over the term of the associated hosting arrangement, ranging from 5 to 15 years, with the amortization expense included in “Other operations and maintenance” on the statement of income. The following table presents the amortization expense, gross carrying value, and related accumulated amortization of capitalized software and deferred cloud implementation costs by year:
Amortization ExpenseGross Carrying ValueAccumulated Amortization
2024202320222024202320242023
Capitalized software costs:
Ameren$224 $212 $159 $1,996 $1,823 $(1,348)$(1,126)
Ameren Missouri118 114 85 881 795 (567)(453)
Ameren Illinois100 92 69 867 786 (552)(452)
Deferred cloud implementation costs:
Ameren$20 $17 $15 $157 $142 $(71)$(51)
Ameren Missouri9 71 63 (32)(23)
Ameren Illinois10 82 76 (36)(26)
Schedule of Capitalized Software, Future Amortization Expense
Annual amortization expense for capitalized software placed in service as of December 31, 2024, is estimated to be as follows:
20252026202720282029
Ameren$190 $147 $110 $69 $38 
Ameren Missouri98 73 54 33 17 
Ameren Illinois85 70 53 34 20