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DERIVATIVE INSTRUMENTS (Tables)
 12 Months Ended
Dec. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value
The following table presents the gross fair values of contracts, categorized by risk type, and the net amounts recorded as current or long-term derivative assets or liabilities:
 
 
 
As of December 31,
 
 
 
2018
 
2017
(Millions of Dollars)
Fair Value Hierarchy
 
Commodity Supply
and Price Risk
Management
 
Netting (1)
 
Net Amount
Recorded as
a Derivative
 
Commodity Supply
and Price Risk
Management
 
Netting (1)
 
Net Amount
Recorded as
a Derivative
Current Derivative Assets:
CL&P
Level 3
 
9.6

 
(3.4
)
 
6.2

 
9.5

 
(7.1
)
 
2.4

Other
Level 2
 
$
1.5

 
$
(0.9
)
 
$
0.6

 
$
—

 
$
—

 
$
—

Long-Term Derivative Assets:
CL&P
Level 3
 
74.2

 
(2.3
)
 
71.9

 
71.9

 
(5.3
)
 
66.6

Current Derivative Liabilities:
CL&P
Level 3
 
(55.1
)
 
—

 
(55.1
)
 
(54.4
)
 
—

 
(54.4
)
Other
Level 2
 
—

 
—

 
—

 
(4.5
)
 
—

 
(4.5
)
Long-Term Derivative Liabilities:
CL&P
Level 3
 
(379.5
)
 
—

 
(379.5
)
 
(376.9
)
 
—

 
(376.9
)
Other
Level 2
 
—

 
—

 
—

 
(0.4
)
 
—

 
(0.4
)

(1)
Amounts represent derivative assets and liabilities that Eversource elected to record net on the balance sheets.  These amounts are subject to master netting agreements or similar agreements for which the right of offset exists.
Fair Value Inputs, Liabilities, Quantitative Information
The following is a summary of CL&P's Level 3 derivative contracts and the range of the significant unobservable inputs utilized in the valuations over the duration of the contracts:
 
As of December 31,
 
2018
 
2017
CL&P
Range
 
Period Covered
 
Range
 
Period Covered
Capacity Prices
$
4.30

 
—
 
7.44
 
per kW-Month
 
2022 - 2026
 
$
5.00

 
—
 
8.70
 
per kW-Month
 
2021 - 2026
Forward Reserve
0.75

 
—
 
1.78
 
per kW-Month
 
2019 - 2024
 
1.00

 
—
 
2.00
 
per kW-Month
 
2018 - 2024
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation
.
CL&P
(Millions of Dollars)
For the Years Ended December 31,
2018
 
2017
Derivatives, Net:
 
 
 
Fair Value as of Beginning of Period
$
(362.3
)
 
$
(420.5
)
Net Realized/Unrealized Losses Included in Regulatory Assets and Liabilities
(32.0
)
 
(9.5
)
Settlements
37.8

 
67.7

Fair Value as of End of Period
$
(356.5
)
 
$
(362.3
)