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GENERATION ASSET SALE (Tables)
12 Months Ended
Dec. 31, 2018
Regulated Operations [Abstract]  
Schedule of Generation Assets and Liabilities
As of December 31, 2018, all generation assets had been sold and as a result, no generation assets were classified as held for sale. As of December 31, 2017, PSNH's generation assets held for sale, which were included in current assets on the Eversource and PSNH balance sheets, and were part of the Electric Distribution reportable segment, were as follows:
(Millions of Dollars)
As of December 31, 2017
Thermal Gross Plant
$
1,091.4

Hydroelectric Gross Plant
83.0

Accumulated Depreciation
(575.4
)
Net Plant
599.0

Fuel and Inventory
87.7

Materials and Supplies
27.3

Emission Allowances
19.1

Other Assets
2.6

Deferred Costs from Thermal Generation Asset Sale
(516.1
)
Total Generation Assets Held for Sale
$
219.6