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SHORT-TERM DEBT (Tables)
 12 Months Ended
Dec. 31, 2019
Debt Disclosure [Abstract]  
Schedule of Borrowings Outstanding
The amount of borrowings outstanding and available under the commercial paper programs were as follows:
 
Borrowings Outstanding
 as of December 31,
 
Available Borrowing Capacity as of December 31,
 
Weighted-Average Interest Rate as of December 31,
(Millions of Dollars)
2019
 
2018
 
2019
 
2018
 
2019
 
2018
Eversource Parent Commercial Paper Program
$
1,224.9

 
$
631.5

 
$
225.1

 
$
818.5

 
1.98
%
 
2.77
%
NSTAR Electric Commercial Paper Program
10.5

 
278.5

 
639.5

 
371.5

 
1.63
%
 
2.50
%


Details of long-term debt outstanding are as follows:
CL&P
(Millions of Dollars)
As of December 31,
2019
 
2018
First Mortgage Bonds:
 
 
 
7.875% 1994 Series D due 2024
$
139.8

 
$
139.8

5.750% 2004 Series B due 2034
130.0

 
130.0

5.625% 2005 Series B due 2035
100.0

 
100.0

6.350% 2006 Series A due 2036
250.0

 
250.0

5.750% 2007 Series B due 2037
150.0

 
150.0

6.375% 2007 Series D due 2037
100.0

 
100.0

5.500% 2009 Series A due 2019
—

 
250.0

2.500% 2013 Series A due 2023
400.0

 
400.0

4.300% 2014 Series A due 2044  
475.0

 
475.0

4.150% 2015 Series A due 2045
350.0

 
350.0

   3.200% 2017 Series A due 2027
500.0

 
300.0

4.000% 2018 Series A due 2048
800.0

 
500.0

Total First Mortgage Bonds
3,394.8

 
3,144.8

Pollution Control Revenue Bonds:
 
 
 
4.375% Fixed Rate Tax Exempt due 2028
120.5

 
120.5

Less Amounts due Within One Year
—

 
(250.0
)
Unamortized Premiums and Discounts, Net
27.8

 
10.2

Unamortized Debt Issuance Costs
(25.0
)
 
(21.5
)
CL&P Long-Term Debt
$
3,518.1

 
$
3,004.0

NSTAR Electric
(Millions of Dollars)
As of December 31,
2019
 
2018
Debentures:
 
 
 
5.750% due 2036
$
200.0

 
$
200.0

5.500% due 2040
300.0

 
300.0

2.375% due 2022
400.0

 
400.0

4.400% due 2044  
300.0

 
300.0

3.250% due 2025
250.0

 
250.0

2.700% due 2026
250.0

 
250.0

3.200% due 2027
700.0

 
700.0

3.250% due 2029
400.0

 
—

Total Debentures
2,800.0

 
2,400.0

Notes:
 
 
 
5.900% Senior Notes Series B due 2034
50.0

 
50.0

6.700% Senior Notes Series D due 2037
40.0

 
40.0

5.100% Senior Notes Series E due 2020
95.0

 
95.0

3.500% Senior Notes Series F due 2021
250.0

 
250.0

3.880% Senior Notes Series G due 2023
80.0

 
80.0

2.750% Senior Notes Series H due 2026
50.0

 
50.0

Total Notes
565.0

 
565.0

Less Amounts due Within One Year
(95.0
)
 
—

Unamortized Premiums and Discounts, Net
(4.1
)
 
(2.5
)
Unamortized Debt Issuance Costs
(18.8
)
 
(17.7
)
NSTAR Electric Long-Term Debt
$
3,247.1

 
$
2,944.8

PSNH
(Millions of Dollars)
As of December 31,
2019
 
2018
First Mortgage Bonds:
 
 
 
5.600% Series M due 2035
$
50.0

 
$
50.0

4.500% Series P due 2019
—

 
150.0

4.050% Series Q due 2021
122.0

 
122.0

3.200% Series R due 2021
160.0

 
160.0

3.500% Series S due 2023  
325.0

 
325.0

3.600% Series T due 2049  
300.0

 
—

Total First Mortgage Bonds
957.0

 
807.0

Less Amounts due Within One Year
—

 
(150.0
)
Unamortized Premiums and Discounts, Net
(0.7
)
 
—

Unamortized Debt Issuance Costs
(4.7
)
 
(1.8
)
PSNH Long-Term Debt
$
951.6

 
$
655.2

OTHER
(Millions of Dollars)
As of December 31,
2019
 
2018
Yankee Gas - First Mortgage Bonds: 2.230% - 8.480% due 2020 - 2049
$
620.0

 
$
470.0

NSTAR Gas - First Mortgage Bonds: 3.740% - 9.950% due 2020 - 2049
460.0

 
385.0

Aquarion - Senior Note 4.000% due 2024
360.0

 
360.0

Aquarion - Unsecured Notes 0% - 6.430% due 2021 - 2049
335.3

 
289.5

Aquarion - Secured Debt 4.100% - 9.640% due 2021 - 2035
68.8

 
70.7

Eversource Parent - Debentures 4.500% due 2019
—

 
350.0

Eversource Parent - Senior Notes 2.500% - 4.250% due 2021 - 2029
4,000.0

 
4,000.0

Pre-1983 Spent Nuclear Fuel Obligation (CYAPC)
11.6

 
39.5

Fair Value Adjustment (1)
109.1

 
144.7

Less Fair Value Adjustment - Current Portion (1)
(31.3
)
 
(36.2
)
Less Amounts due in One Year
(201.1
)
 
(401.1
)
Commercial Paper Classified as Long-Term Debt (See Note 8, Short-Term Debt)
346.3

 
—

Unamortized Premiums and Discounts, Net  
(4.1
)
 
(4.2
)
Unamortized Debt Issuance Costs
(20.6
)
 
(23.2
)
Total Other Long-Term Debt
$
6,054.0

 
$
5,644.7

 
 
 
 
Total Eversource Long-Term Debt
$
13,770.8

 
$
12,248.7


(1)
The fair value adjustment amount is the purchase price adjustments, net of amortization, required to record long-term debt at fair value on the dates of the 2012 merger with NSTAR and the 2017 acquisition of Aquarion.