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Regulatory and Rate Matters - TXNM (Details) - Merger Agreement - TXNM $ in Millions	Aug. 25, 2025 USD ($)
NMPRC
Public Utilities, General Disclosures [Line Items]
Rate credits	$ 105.0
Residential rate credits, payment period	4 years
Contribution to fund	$ 10.0
Contribution payment period	10 years
Economic development fund	$ 35.0
Development fund payment period	10 years
Commitment to innovative technologies	$ 25.0
PUCT
Public Utilities, General Disclosures [Line Items]
Rate credits	$ 35.0
Residential rate credits, payment period	4 years
Economic development fund	$ 10.0
Development fund payment period	10 years
Additional community support	$ 5.0
Charitable fund payment period	10 years
Statutory resolve period	180 days
FERC
Public Utilities, General Disclosures [Line Items]
Statutory resolve period	180 days

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