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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES -Transfer of Energy Efficiency Loans (Details) - The Connecticut Light and Power Company - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Maximum loans receivable outstanding | $ 55.0 |
Loans transferred receivable current | 10.5 | $ 12.9
Loans transferred receivable non-current | $ 8.3 | $ 9.5

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