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REGULATORY ACCOUNTING - Narrative (Details) - USD ($)
$ in Millions
May 01, 2023
Jun. 30, 2023
Dec. 31, 2022
Regulatory Assets [Line Items]      
Amount of regulatory costs not yet approved   $ 248.3 $ 210.8
Regulatory assets   5,773.0 5,578.3
Operation, maintenance and vegetation expenses      
Regulatory Assets [Line Items]      
Purchase price of regulatory assets $ 23.3    
Regulatory assets $ 16.9    
COVID-19      
Regulatory Assets [Line Items]      
Net incremental deferred costs   29.8 29.8
CL&P      
Regulatory Assets [Line Items]      
Amount of regulatory costs not yet approved   164.4 135.9
Regulatory assets   2,019.3 1,907.8
CL&P | COVID-19      
Regulatory Assets [Line Items]      
Net incremental deferred costs   11.8 11.8
NSTAR Electric      
Regulatory Assets [Line Items]      
Amount of regulatory costs not yet approved   23.7 19.8
Regulatory assets   1,800.2 1,714.4
NSTAR Electric | COVID-19      
Regulatory Assets [Line Items]      
Net incremental deferred costs   2.2 2.2
PSNH      
Regulatory Assets [Line Items]      
Amount of regulatory costs not yet approved   1.1 1.0
Regulatory assets   $ 883.6 $ 696.2