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Regulatory Matters - Narrative (Details) $ in Millions |  |  |  | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 19, 2025 USD ($) | Sep. 11, 2024 MW | Mar. 23, 2023 USD ($) | Dec. 31, 2021 lease | Mar. 31, 2025 USD ($) MW | Dec. 31, 2024 USD ($) | Nov. 08, 2024 USD ($) | Jun. 29, 2023 USD ($) | Jan. 04, 2023 USD ($)
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |
Total current regulatory assets |  |  |  |  | $ 168.0 | $ 239.0 |  |  |
Regulatory assets |  |  |  |  | 3,086.0 | 3,108.0 |  |  |
Cost of recovery for power consumption | MW |  | 32 |  |  |  |  |  |  |
Return on investment for power consumption | MW |  | 5 |  |  |  |  |  |  |
February 2021 Winter Storm |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |
Total current regulatory assets |  |  |  |  | 67.0 |  |  |  |
Total regulatory asset |  |  |  |  | 19.0 | 19.0 |  |  |
Public Utility Commission Of Texas |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |
Total regulatory asset |  |  |  |  | 8.0 | 8.0 |  |  |
IURC |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |
Regulatory asset, authorized issuance costs |  |  |  |  |  |  |  |  | $ 350.0
CERC |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |
Total current regulatory assets |  |  |  |  | 155.0 | 238.0 |  |  |
Regulatory assets |  |  |  |  | 829.0 | 903.0 |  |  |
CERC | February 2021 Winter Storm |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |
Total current regulatory assets |  |  |  |  | 67.0 |  |  |  |
Houston Electric |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  |  | 1,346.0 | 1,284.0 |  |  |
Number of leases entered into | lease |  |  |  | 2 |  |  |  |  |
Expenses associated with short-term lease |  |  |  |  | 87.0 | 89.0 |  |  |
Expenses associated with long term lease |  |  |  |  | $ 165.0 | 158.0 |  |  |
Number of megawatts of mobile generation | MW |  |  |  |  | 505 |  |  |  |
Houston Electric | Assets With Lease Payments |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |
Escrow deposit |  |  |  |  | $ 75.0 |  |  |  |
Houston Electric | February 2021 Winter Storm |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |
Total regulatory asset |  |  |  |  | 19.0 | 19.0 |  |  |
Houston Electric | Public Utility Commission Of Texas |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |
Total regulatory asset |  |  |  |  | 8.0 | 8.0 |  |  |
SIGECO | Subsidiaries |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |
Regulatory asset, issued |  |  |  |  |  |  |  | $ 341.0 |
February 2021 Winter Storm Event |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  |  | 44.0 |  |  |  |
February 2021 Winter Storm Event | Customer Rate Relief Bond Financing |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |
Cash proceeds received from government grants |  |  | $ 1,100.0 |  |  |  |  |  |
February 2021 Winter Storm Event | CERC |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |
Regulatory asset, approximate total gas cost |  |  |  |  | 2,000.0 |  |  |  |
Total current regulatory assets |  |  |  |  |  | 67.0 |  |  |
Regulatory assets |  |  |  |  | 44.0 | $ 67.0 |  |  |
February 2021 Winter Storm Event | CERC | Customer Rate Relief Bond Financing |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |
Cash proceeds received from government grants |  |  | $ 1,100.0 |  |  |  |  |  |
May 2024 Storm Events |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |
Estimated case processing expenses and carrying costs |  |  |  |  |  |  | $ 502.0 |  |
Entitled to recover a total | $ 396.0 |  |  |  |  |  |  |  |
Transmission-related costs | 29.0 |  |  |  |  |  |  |  |
Distribution-related costs | 17.5 |  |  |  |  |  |  |  |
Reduction in cost | $ 10.0 |  |  |  |  |  |  |  |
Hurricane Beryl | Houston Electric |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |
Estimated storm restoration costs |  |  |  |  | $ 1,200.0 |  |  |  |

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- Definition Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are expected to be recovered through revenue sources within one year or the normal operating cycle, if longer. Such costs are capitalized if they meet both of the following criteria: a. It is probable that future revenue in an amount at least equal to the capitalized cost will result from inclusion of that cost in allowable costs for rate-making purposes. b. Based on available evidence, the future revenue will be provided to permit recovery of the previously incurred cost rather than to provide for expected levels of similar future costs. If the revenue will be provided through an automatic rate-adjustment clause, this criterion requires that the regulator's intent clearly be to permit recovery of the previously incurred cost. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 980 -SubTopic 340 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478742/980-340-50-1 + Details
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