PRESENTATION OF FINANCIAL INFORMATION - Narrative (Details)	3 Months Ended
	Mar. 31, 2024 member_system class_of_membership facility non-utility_member
Disaggregation of Revenue [Line Items]
Number of classes of members | class_of_membership	3
Number of jointly owned facilities | facility	2
Class A Members
Disaggregation of Revenue [Line Items]
Number of members	42
Class B Members
Disaggregation of Revenue [Line Items]
Number of members	0
Non-Utility Members
Disaggregation of Revenue [Line Items]
Number of members | non-utility_member	3