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Property And Plant, Net | 12 Months Ended
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Dec. 31, 2022
Property, Plant and Equipment [Abstract] |
PROPERTY AND PLANT, NET | PROPERTY, PLANT, AND EQUIPMENT, NET The following table presents components of “Property, plant, and equipment, net” at December 31, 2022 and 2021:
|  | Ameren Missouri |  | Ameren Illinois |  | Other |  | Ameren
2022 |  |  |  |  |  |  |  |
Property, plant, and equipment at original cost(a): |  |  |  |  |  |  |  |
Electric generation: |  |  |  |  |  |  |  |
Coal(b)(c) |  | $ | 3,454 |  |  | $ | — |  |  | $ | — |  |  | $ | 3,454 |
Natural gas |  | 961 |  |  | — |  |  | — |  |  | 961 |
Nuclear |  | 5,725 |  |  | — |  |  | — |  |  | 5,725 |
Renewable(d) |  | 1,957 |  |  | 11 |  |  | — |  |  | 1,968 |
Electric distribution |  | 7,993 |  |  | 7,351 |  |  | — |  |  | 15,344 |
Electric transmission |  | 1,884 |  |  | 4,617 |  |  | 1,815 |  |  | 8,316 |
Natural gas |  | 640 |  |  | 3,883 |  |  | — |  |  | 4,523 |
Other(e) |  | 1,904 |  |  | 1,395 |  |  | 249 |  |  | 3,548 |
|  | 24,518 |  |  | 17,257 |  |  | 2,064 |  |  | 43,839 |
Less: Accumulated depreciation and amortization |  | 9,682 |  |  | 4,418 |  |  | 365 |  |  | 14,465 |
|  | 14,836 |  |  | 12,839 |  |  | 1,699 |  |  | 29,374 |
Construction work in progress: |  |  |  |  |  |  |  |
Nuclear fuel in process |  | 108 |  |  | — |  |  | — |  |  | 108 |
Other |  | 598 |  |  | 514 |  |  | 86 |  |  | 1,198 |
Plant to be abandoned, net(f) |  | 582 |  |  | — |  |  | — |  |  | 582 |
Property, plant, and equipment, net |  | $ | 16,124 |  |  | $ | 13,353 |  |  | $ | 1,785 |  |  | $ | 31,262 |
2021 |  |  |  |  |  |  |  |
Property, plant, and equipment at original cost(a): |  |  |  |  |  |  |  |
Electric generation: |  |  |  |  |  |  |  |
Coal(b)(c) |  | $ | 3,955 |  |  | $ | — |  |  | $ | — |  |  | $ | 3,955 |
Natural gas |  | 1,105 |  |  | — |  |  | — |  |  | 1,105 |
Nuclear |  | 5,615 |  |  | — |  |  | — |  |  | 5,615 |
Renewable(d) |  | 1,889 |  |  | — |  |  | — |  |  | 1,889 |
Electric distribution |  | 7,286 |  |  | 7,017 |  |  | — |  |  | 14,303 |
Electric transmission |  | 1,628 |  |  | 4,105 |  |  | 1,800 |  |  | 7,533 |
Natural gas |  | 607 |  |  | 3,586 |  |  | — |  |  | 4,193 |
Other(e) |  | 1,584 |  |  | 1,183 |  |  | 242 |  |  | 3,009 |
|  | 23,669 |  |  | 15,891 |  |  | 2,042 |  |  | 41,602 |
Less: Accumulated depreciation and amortization |  | 9,784 |  |  | 4,100 |  |  | 330 |  |  | 14,214 |
|  | 13,885 |  |  | 11,791 |  |  | 1,712 |  |  | 27,388 |
Construction work in progress: |  |  |  |  |  |  |  |
Nuclear fuel in process |  | 133 |  |  | — |  |  | — |  |  | 133 |
Other |  | 674 |  |  | 432 |  |  | 30 |  |  | 1,136 |
Plant to be abandoned, net(f) |  | 604 |  |  | — |  |  | — |  |  | 604 |
Property, plant, and equipment, net |  | $ | 15,296 |  |  | $ | 12,223 |  |  | $ | 1,742 |  |  | $ | 29,261 |
(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 $29 million of oil-fired generation at December 31, 2022 and 2021. (c)Original cost amounts include two CTs that had related financing obligations. The gross cumulative plant asset values related to outstanding financing obligations as of December 31, 2022 and 2021, was $125 million and $243 million, respectively. The related accumulated depreciation was $54 million and $105 million. The financing obligation for the Peno Creek CT Energy Center was settled in December 2022, while the financing obligation for the Audrain CT Energy Center was settled in January 2023. See Note 5 – Long-term Debt and Equity Financings for additional information on these agreements. (d)Renewable includes hydroelectric, wind, solar, and methane gas generation facilities. (e)Other property, plant, and equipment includes assets used to support electric and natural gas services. (f)Represents the net book value of the Rush Island Energy Center and related construction work in progress as Ameren Missouri expects to retire the energy center significantly in advance of its previously expected useful life and in the near term. See Plant to be Abandoned, Net under Note 1 – Summary of Significant Accounting Policies and NSR and Clean Air Act Litigation under Note 14 – Commitments and Contingencies for additional information on the planned accelerated retirement of the Rush Island Energy Center. 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. The following table presents the amortization, gross carrying value, and related accumulated amortization of capitalized software by year:
|  | Amortization Expense |  | Gross Carrying Value |  | Accumulated Amortization
|  | 2022 | 2021 | 2020 |  | 2022 | 2021 |  | 2022 | 2021
Ameren |  | $ | 159 |  | $ | 125 |  | $ | 93 |  |  | $ | 1,443 |  | $ | 1,199 |  |  | $ | (914) |  | $ | (757) |
Ameren Missouri |  | 85 |  | 66 |  | 44 |  |  | 613 |  | 523 |  |  | (339) |  | (255) |
Ameren Illinois |  | 69 |  | 53 |  | 45 |  |  | 601 |  | 452 |  |  | (360) |  | (291) |
Annual amortization expense for capitalized software placed in service as of December 31, 2022, is estimated to be as follows:
|  | 2023 |  | 2024 |  | 2025 |  | 2026 |  | 2027
Ameren |  | $ | 170 |  |  | $ | 131 |  |  | $ | 83 |  |  | $ | 51 |  |  | $ | 30 |
Ameren Missouri |  | 91 |  |  | 71 |  |  | 46 |  |  | 26 |  |  | 15 |
Ameren Illinois |  | 74 |  |  | 56 |  |  | 35 |  |  | 24 |  |  | 15 |

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