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Unconsolidated Affiliates (Tables)
12 Months Ended
Dec. 31, 2016
Equity Method Investments and Joint Ventures [Abstract]  
Equity Method Investments [Table Text Block]
Investment in Unconsolidated Affiliates:
 
 
As of December 31,
 
 
2016
 
2015
 
 
(in millions)
Enable
 
$
2,505

 
$
2,594


Equity in Earnings (Losses) of Unconsolidated Affiliates, net:
 
 
Year Ended December 31,
 
 
2016
 
2015
 
2014
 
 
(in millions)
Enable
 
$
208

 
$
(1,633
)
 
$
303

SESH (1)
 

 

 
5

  Total
 
$
208

 
$
(1,633
)
 
$
308


(1)
CERC contributed a 24.95% interest in SESH to Enable on May 30, 2014 and its remaining 0.1% interest in SESH to Enable on June 30, 2015.

Limited Partner Interest in Enable:
 
 
As of December 31,
 
 
2016
 
2015
 
2014
CenterPoint Energy
 
54.1
%
(1)
55.4
%
 
55.4
%
OGE
 
25.7
%
 
26.3
%
 
26.3
%

(1)
In November 2016, Enable closed a public offering of 10,000,000 common units. In connection with the offering, Enable and an affiliate of ArcLight sold an additional combined 1,500,000 common units to the underwriters.

Enable Common and Subordinated Units Held:
 
 
December 31, 2016
 
 
Common
 
Subordinated
CenterPoint Energy
 
94,151,707

 
139,704,916

OGE
 
42,832,291

 
68,150,514


Sales of more than 5% of the aggregate of the common units and subordinated units we own in Enable or sales by OGE of more than 5% of the aggregate of the common units and subordinated units it owns in Enable are subject to mutual rights of first offer and first refusal.

Enable is controlled jointly by CERC Corp. and OGE, and each own 50% of the management rights in the general partner of Enable. Sale of our or OGE’s ownership interests in Enable’s general partner to a third party is subject to mutual rights of first offer and first refusal, and we are not permitted to dispose of less than all of our interest in Enable’s general partner.

Summarized consolidated income (loss) information for Enable is as follows:
 
 
Year Ended December 31,
 
 
2016
 
2015
 
2014
 
 
(in millions)
Operating revenues
 
$
2,272

 
$
2,418

 
$
3,367

Cost of sales, excluding depreciation and amortization
 
1,017

 
1,097

 
1,914

Impairment of goodwill and other long-lived assets
 
9

 
1,134

 
8

Operating income (loss)
 
385

 
(712
)
 
586

Net income (loss) attributable to Enable
 
290

 
(752
)
 
530

 
 
 
 
 
 
 
Reconciliation of Equity in Earnings (Losses), net:
 
 
 
 
 
 
CERC’s interest
 
$
160

 
$
(416
)
 
$
298

Basis difference amortization (1)
 
48

 
8

 
5

Impairment of CERC’s equity method investment in Enable
 

 
(1,225
)
 

CERC’s equity in earnings (losses), net (2)
 
$
208

 
$
(1,633
)
 
$
303

(1)
Equity in earnings of unconsolidated affiliates includes CERC’s share of Enable earnings adjusted for the amortization of the basis difference of CERC’s original investment in Enable and its underlying equity in net assets of Enable. The basis difference is being amortized over approximately 33 years, the average life of the assets to which the basis difference is attributed.

(2)
These amounts include impairment charges totaling $1,846 million composed of CERC’s impairment of its equity method investment in Enable of $1,225 million and CERC’s share, $621 million, of impairment charges Enable recorded for goodwill and long-lived assets for the year ended December 31, 2015. This impairment is offset by $213 million of earnings for the year ended December 31, 2015.

Summarized consolidated balance sheet information for Enable is as follows:
 
 
December 31,
 
 
2016
 
2015
 
 
(in millions)
Current assets
 
$
396

 
$
381

Non-current assets
 
10,816

 
10,845

Current liabilities
 
362

 
615

Non-current liabilities
 
3,056

 
3,080

Non-controlling interest
 
12

 
12

Preferred equity
 
362

 

Enable partners’ capital
 
7,420

 
7,519

 
 
 
 
 
Reconciliation of Investment in Enable:
 
 
 
 
CERC’s ownership interest in Enable partners’ capital
 
$
4,067

 
$
4,163

CERC’s basis difference
 
(1,562
)
 
(1,569
)
CERC’s investment in Enable
 
$
2,505

 
$
2,594



Distributions Received from Unconsolidated Affiliates:
 
 
Year Ended December 31,
 
 
2016
 
2015
 
2014
 
 
(in millions)
Investment in Enable’s common and subordinated units
 
$
297

 
$
294

 
$
298

Interest in SESH (1)
 

 

 
7

  Total
 
$
297

 
$
294

 
$
305

(1)
CERC contributed a 24.95% interest in SESH to Enable on May 30, 2014 and its remaining 0.1% interest in SESH to Enable on June 30, 2015.

Transactions with Enable:
 
 
Year Ended December 31,
 
 
2016
 
2015
 
2014
 
 
(in millions)
Reimbursement of transition services (1)
 
$
7

 
$
16

 
$
163

Natural gas expenses, including transportation and storage costs
 
110

 
117

 
130

Interest income related to notes receivable from Enable
 
1

 
8

 
8


(1)
Represents amounts billed under the Transition Agreements, including the costs of seconded employees. Actual transition services costs are recorded net of reimbursement.

 
 
Year Ended December 31,
 
 
2016
 
2015
 
 
(in millions)
Accounts receivable for amounts billed for transition services
 
$
1

 
$
3

Interest receivable related to notes receivable from Enable
 

 
4

Accounts payable for natural gas purchases from Enable
 
10

 
11