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SEGMENT INFORMATION
 3 Months Ended
Mar. 31, 2018
Segment Reporting [Abstract]  
SEGMENT INFORMATION
SEGMENT INFORMATION

Presentation:  Eversource is organized among the Electric Distribution, Electric Transmission, Natural Gas Distribution and Water Distribution reportable segments and Other based on a combination of factors, including the characteristics of each segments' services, the sources of operating revenues and expenses and the regulatory environment in which each segment operates.  These reportable segments represent substantially all of Eversource's total consolidated revenues.  Revenues from the sale of electricity, natural gas and water primarily are derived from residential, commercial and industrial customers and are not dependent on any single customer.  The Electric Distribution reportable segment includes the results of PSNH's generation facilities and NSTAR Electric's solar power facilities. Eversource's reportable segments are determined based upon the level at which Eversource's chief operating decision maker assesses performance and makes decisions about the allocation of company resources. On December 4, 2017, Eversource acquired Aquarion, which was considered to be a new operating segment, water distribution. Though the water distribution segment does not meet quantitative thresholds under the segment reporting accounting guidance, based on qualitative factors including the nature of the water distribution business, Water Distribution was deemed a reportable segment beginning in the first quarter of 2018.
 
The remainder of Eversource's operations is presented as Other in the tables below and primarily consists of 1) the equity in earnings of Eversource parent from its subsidiaries and intercompany interest income, both of which are eliminated in consolidation, and interest expense related to the debt of Eversource parent, 2) the revenues and expenses of Eversource Service, most of which are eliminated in consolidation, 3) the operations of CYAPC and YAEC, and 4) the results of other unregulated subsidiaries, which are not part of its core business. In addition, Other in the tables below includes Eversource parent's equity ownership interests in certain natural gas pipeline projects owned by Enbridge, Inc., the Bay State Wind project, a renewable energy investment fund, and two companies that transmit hydroelectricity imported from the Hydro-Quebec system in Canada. In the ordinary course of business, Yankee Gas and NSTAR Gas purchase natural gas transmission services from the Enbridge, Inc. natural gas pipeline projects described above. These affiliate transaction costs total approximately $62.5 million annually and are classified as Purchased Power, Fuel and Transmission on the Eversource statements of income.

Each of Eversource's subsidiaries, including CL&P, NSTAR Electric and PSNH, has one reportable segment.

Cash flows used for investments in plant included in the segment information below are cash capital expenditures that do not include amounts incurred but not paid, cost of removal, AFUDC related to equity funds, and the capitalized portions of pension expense.   

Eversource's segment information is as follows:
 
For the Three Months Ended March 31, 2018 (1)
Eversource
(Millions of Dollars)
Electric Distribution
 
Natural Gas Distribution
 
Electric Transmission
 
Water Distribution
 
Other
 
Eliminations
 
Total
Operating Revenues
$
1,754.6

 
$
424.9

 
$
305.0

 
$
44.6

 
$
230.9

 
$
(472.0
)
 
$
2,288.0

Depreciation and Amortization
(144.4
)
 
(26.4
)
 
(56.6
)
 
(10.7
)
 
(12.0
)
 
0.6

 
(249.5
)
Other Operating Expenses
(1,443.5
)
 
(312.6
)
 
(83.2
)
 
(23.9
)
 
(204.7
)
 
471.9

 
(1,596.0
)
Operating Income
$
166.7

 
$
85.9

 
$
165.2

 
$
10.0

 
$
14.2

 
$
0.5

 
$
442.5

Interest Expense
$
(47.4
)
 
$
(11.1
)
 
$
(29.7
)
 
$
(8.4
)
 
$
(31.9
)
 
$
7.4

 
$
(121.1
)
Other Income, Net
19.6

 
2.0

 
8.0

 
(0.6
)
 
360.1

 
(355.3
)
 
33.8

Net Income Attributable to Common Shareholders
104.2

 
57.8

 
107.4

 
1.5

 
346.0

 
(347.4
)
 
269.5

Cash Flows Used for Investments in Plant
236.0

 
70.4

 
239.2

 
19.0

 
42.7

 
—

 
607.3

 
For the Three Months Ended March 31, 2017
Eversource
(Millions of Dollars)
Electric
Distribution
 
Natural Gas
Distribution
 
Electric
Transmission
 
Water Distribution
 
Other
 
Eliminations
 
Total
Operating Revenues
$
1,401.1

 
$
403.6

 
$
316.9

 
$
—

 
$
236.3

 
$
(252.8
)
 
$
2,105.1

Depreciation and Amortization
(129.8
)
 
(21.7
)
 
(50.6
)
 
—

 
(9.2
)
 
0.5

 
(210.8
)
Other Operating Expenses
(1,048.9
)
 
(290.2
)
 
(90.2
)
 
—

 
(216.8
)
 
252.8

 
(1,393.3
)
Operating Income
$
222.4

 
$
91.7

 
$
176.1

 
$
—

 
$
10.3

 
$
0.5

 
$
501.0

Interest Expense
$
(48.2
)
 
$
(10.6
)
 
$
(28.1
)
 
$
—

 
$
(19.7
)
 
$
3.2

 
$
(103.4
)
Other Income, Net
12.0

 
0.9

 
5.1

 
—

 
329.1

 
(325.5
)
 
21.6

Net Income Attributable to Common Shareholders
114.1

 
50.8

 
94.2

 
—

 
322.2

 
(321.8
)
 
259.5

Cash Flows Used for Investments in Plant
236.2

 
64.5

 
192.6

 
—

 
30.3

 
—

 
523.6


(1)
Effective January 1, 2018, upon implementation of the new revenue accounting guidance, the electric distribution segment is presented gross and intercompany transmission billings are presented in the eliminations column, as Eversource believes that the electric distribution segment acts as a principal, rather than an agent, in its contracts with retail customers. Retail customers contract directly with the electric distribution utility and do not differentiate between distribution and transmission services. Therefore, the electric distribution segment revenues, which are derived from retail customer billings, are presented gross of the eliminations. Prior to 2018, the electric distribution segment presented intercompany electric transmission billings net, based on indicators of net presentation prior to the new revenue guidance.  See Note 15, "Revenues," regarding accounting for revenues.

The following table summarizes Eversource's segmented total assets:
Eversource
(Millions of Dollars)
Electric
Distribution
 
Natural Gas
Distribution
 
Electric
Transmission
 
Water Distribution
 
Other
 
Eliminations
 
Total
As of March 31, 2018
$
21,167.9

 
$
3,636.8

 
$
9,833.2

 
$
2,487.9

 
$
16,586.5

 
$
(16,672.3
)
 
$
37,040.0

As of December 31, 2017
19,250.4

 
3,595.2

 
9,401.2

 
2,470.0

 
15,933.8

 
(14,430.2
)
 
36,220.4