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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)
 6 Months Ended
Jun. 30, 2018
Accounting Policies [Abstract]  
Schedule of Accounts, Notes, Loans and Financing Receivable
The total provision for both uncollectible accounts and for uncollectible hardship accounts (the uncollectible hardship balance is included in the total provision) is included in Receivables, Net on the balance sheets, and is as follows:
 
Total Provision for Uncollectible Accounts
 
Uncollectible Hardship
(Millions of Dollars)
As of June 30, 2018
 
As of December 31, 2017
 
As of June 30, 2018
 
As of December 31, 2017
Eversource
$
211.3

 
$
195.7

 
$
126.8

 
$
122.5

CL&P
80.4

 
78.9

 
64.5

 
65.5

NSTAR Electric
77.2

 
69.7

 
44.0

 
40.3

PSNH
11.5

 
10.5

 
—

 
—



In accordance with new revenue accounting guidance, bad debt expense associated with customers' accounts receivable included in Operations and Maintenance expense on the statements of income is presented as follows:
 
For the Three Months Ended
 
For the Six Months Ended
(Millions of Dollars)
June 30, 2018
 
June 30, 2017
 
June 30, 2018
 
June 30, 2017
Eversource
$
9.5

 
$
(0.3
)
 
$
29.3

 
$
15.7

CL&P
3.8

 
(4.7
)
 
7.7

 
(1.9
)
NSTAR Electric
3.8

 
0.4

 
11.3

 
6.9

PSNH
1.5

 
1.9

 
3.2

 
3.6
Schedule of Other Income, Net
The components of Other Income, Net on the statements of income were as follows:
 
For the Three Months Ended
 
June 30, 2018
 
June 30, 2017
(Millions of Dollars)
Eversource
 
CL&P
 
NSTAR Electric
 
PSNH
 
Eversource
 
CL&P
 
NSTAR Electric
 
PSNH
Pension, SERP and PBOP Non-Service
  Income Components (1)
$
14.6

 
$
2.4

 
$
9.5

 
$
2.1

 
$
7.5

 
$
0.4

 
$
4.8

 
$
1.5

AFUDC Equity
10.9

 
3.3

 
3.9

 
—

 
8.0

 
2.9

 
2.2

 
—

Equity in Earnings (2)
22.9

 
—

 
0.4

 
—

 
13.3

 
—

 
(0.1
)
 
—

Investment (Loss)/Income
(0.3
)
 
0.4

 
0.3

 
—

 
(1.7
)
 
(0.4
)
 
(0.1
)
 
(0.2
)
Interest Income
1.9

 
1.0

 
0.2

 
1.3

 
1.9

 
1.3

 
0.3

 
0.6

Other
0.1

 
—

 
—

 
—

 
—

 
—

 
—

 
—

Total Other Income, Net (1)
$
50.1

 
$
7.1

 
$
14.3

 
$
3.4

 
$
29.0

 
$
4.2

 
$
7.1

 
$
1.9

 
For the Six Months Ended
 
June 30, 2018
 
June 30, 2017
(Millions of Dollars)
Eversource
 
CL&P
 
NSTAR Electric
 
PSNH
 
Eversource
 
CL&P
 
NSTAR Electric
 
PSNH
Pension, SERP and PBOP Non-Service
  Income Components (1)
$
29.8

 
$
5.3

 
$
17.9

 
$
4.4

 
$
15.5

 
$
0.9

 
$
9.8

 
$
3.1

AFUDC Equity
20.6

 
6.1

 
7.3

 
—

 
14.6

 
4.8

 
4.1

 
—

Equity in Earnings (2)
27.5

 
—

 
0.4

 
—

 
17.9

 
—

 
(0.1
)
 
—

Investment Income/(Loss)
0.4

 
0.2

 
0.9

 
0.1

 
(1.0
)
 
(0.6
)
 
1.1

 
0.5

Interest Income
5.4

 
2.0

 
0.4

 
3.7

 
3.6

 
2.4

 
0.5

 
1.1

Other
0.2

 
—

 
—

 
—

 
—

 
—

 
—

 
—

Total Other Income, Net (1)
$
83.9

 
$
13.6

 
$
26.9

 
$
8.2

 
$
50.6

 
$
7.5

 
$
15.4

 
$
4.7


(1) 
As a result of the adoption of new accounting guidance, the non-service related components of pension, SERP and PBOP benefit costs are presented as non-operating income and recorded in Other Income, Net on the statements of income. The 2017 amounts, which were previously presented within Operations and Maintenance expense on the statements of income, have been retrospectively presented within Other Income, Net for the three and six months ended June 30, 2017. Eversource elected the practical expedient in the accounting guidance that allows the Company to use the amounts disclosed in its Pension Benefits and Postretirement Benefits Other Than Pension footnote for the prior period presentations as the estimation basis for applying the retrospective presentation requirements.

(2) Equity in earnings includes $17.6 million of unrealized gains associated with an investment in a renewable energy fund for both the three and six months ended June 30, 2018. For both the three and six months ended June 30, 2017, unrealized gains on this investment totaled $9.7 million.
State Of Connecticut Gross Earnings Taxes
These gross receipts taxes are shown separately with collections in Operating Revenues and with payments in Taxes Other Than Income Taxes on the statements of income as follows:
 
For the Three Months Ended
 
For the Six Months Ended
(Millions of Dollars)
June 30, 2018
 
June 30, 2017
 
June 30, 2018
 
June 30, 2017
Eversource
$
35.6

 
$
35.7

 
$
79.0

 
$
77.9

CL&P
31.5

 
31.8

 
67.1

 
65.7
Schedule of Supplemental Cash Flow Information
Non-cash investing activities include plant additions included in Accounts Payable as follows:
(Millions of Dollars)
As of June 30, 2018
 
As of June 30, 2017
Eversource
$
305.7

 
$
172.0

CL&P
110.9

 
85.9

NSTAR Electric
71.1

 
40.1

PSNH
46.6

 
20.2
Schedule of Cash and Cash Equivalents
The following table reconciles cash and cash equivalents as reported on the balance sheets to the cash, cash equivalents, and restricted cash as reported on the statements of cash flows:
 
As of June 30, 2018
 
As of December 31, 2017
(Millions of Dollars)
Eversource
 
CL&P
 
NSTAR Electric
 
PSNH
 
Eversource
 
CL&P
 
NSTAR Electric
 
PSNH
Cash and Cash Equivalents as reported on the Balance Sheets
$
64.2

 
$
1.8

 
$
0.1

 
$
0.4

 
$
38.2

 
$
6.0

 
$
1.8

 
$
0.9

Restricted cash included in:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Prepayments and Other Current Assets
28.6

 
3.5

 
12.9

 
4.3

 
24.4

 
3.1

 
12.8

 
0.5

Marketable Securities
25.8

 
0.4

 
0.1

 
0.6

 
23.3

 
0.5

 
0.1

 
0.8

Other Long-Term Assets
3.2

 
—

 
—

 
3.2

 
—

 
—

 
—

 
—

Cash, Cash Equivalents, and Restricted Cash reported on the Statements of Cash Flows
$
121.8

 
$
5.7

 
$
13.1

 
$
8.5

 
$
85.9

 
$
9.6

 
$
14.7

 
$
2.2