SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES OPERATING REVENUES (Details)	12 Months Ended
	Dec. 31, 2021 contract performance_obligations
Electric
Disaggregation of Operating Revenues
Number of days payment is due	30 days
Electric | Retail
Disaggregation of Operating Revenues
Number of performance obligations	1
Percentage fuel and purchased power costs can vary from the rate case approved amounts before deferral is required	2.00%
Electric | Wholesale
Disaggregation of Operating Revenues
Number of performance obligations	2
Number of contracts | contract	1
Natural gas
Disaggregation of Operating Revenues
Number of days payment is due	30 days