Regulatory and Rate Matters - PVNGS Leased Interest Abandonment Application (Details)	Apr. 02, 2021 lease MW	Nov. 13, 2020 MW	Jul. 29, 2020 MW
Public Utilities, General Disclosures [Line Items]
Regulatory time frame for proposed PPAs and battery storage agreements	6 months
Public Service Company of New Mexico
Public Utilities, General Disclosures [Line Items]
Number of leases under which lease term was extended | lease	5
Solar distributed generation (in mw)			650
Number of megawatts in battery storage facilities (in megawatts)			300
Public Service Company of New Mexico | Leased Interest Termination On January 15, 2023
Public Utilities, General Disclosures [Line Items]
Number of leases under which lease term was extended | lease	4
Public Service Company of New Mexico | Replacement Resource Portfolio One
Public Utilities, General Disclosures [Line Items]
Solar distributed generation (in mw)	150	200
Number of megawatts in battery storage facilities (in megawatts)	40	100
Public Service Company of New Mexico | Replacement Resource Portfolio Two
Public Utilities, General Disclosures [Line Items]
Solar distributed generation (in mw)		100
Number of megawatts in battery storage facilities (in megawatts)	100	30
Public Service Company of New Mexico | Replacement Resource Portfolio Three
Public Utilities, General Disclosures [Line Items]
Solar distributed generation (in mw)	300
Number of megawatts in battery storage facilities (in megawatts)	150
NMPRC | Public Service Company of New Mexico
Public Utilities, General Disclosures [Line Items]
Solar generation capacity, amount requested for approval to abandon, in megawatts	114
NMPRC | Public Service Company of New Mexico | Leased Interest Termination On January 15, 2023
Public Utilities, General Disclosures [Line Items]
Solar distributed generation (in mw)	104
NMPRC | Public Service Company of New Mexico | Leased Interest Termination On January 15, 2024
Public Utilities, General Disclosures [Line Items]
Solar distributed generation (in mw)	10