Investment in Unconsolidated Affiliate and Related Party Transactions (Tables)

12 Months Ended

Dec. 31, 2015

Equity Method Investments and Joint Ventures [Abstract]

OG&E entered into a new contract with Enable to provide transportation services effective May 1, 2014 which eliminated the natural gas storage services. This transportation agreement grants Enable the responsibility of delivering natural gas to OG&E’s generating facilities and performing an imbalance service. With this imbalance service, in accordance with the cash-out provision of the contract, OG&E purchases gas from Enable when Enable’s deliveries exceed OG&E’s pipeline receipts. Enable purchases gas from OG&E when OG&E’s pipeline receipts exceed Enable’s deliveries. The following table summarizes related party transactions between OG&E and Enable during the years ended December 31, 2015, 2014 and the eight months ended December 31, 2013.



	Year Ended December 31,
(In millions)	2015		2014		2013
Operating Revenues:
Electricity to power electric compression assets	$	13.8	$	13.3	$	7.7
Cost of Sales:
Natural gas transportation services	$	35.0	$	34.9	$	23.2
Natural gas storage services	—		4.4		8.6
Natural gas purchases/(sales)	7.6		8.7		14.8

Summarized Balance Sheet Financial Information, Equity Method Investment [Table Text Block]

Summarized unaudited financial information for 100 percent of Enable is presented below for the years ended December 31, 2015 and 2014 and for the eight months ended December 31, 2013.



Balance Sheet	December 31,
(In millions)	2015		2014
Current assets	$	381	$	438
Non-current assets	10,857		11,399
Current liabilities	615		671
Non-current liabilities	3,092		2,344

Summarized Income Statement Financial Information, Equity Method Investment [Table Text Block]



Income Statement	Year Ended December 31,
(In millions)	2015			2014		2013
Operating revenues	$	2,418		$	3,367	$	2,123
Cost of natural gas and natural gas liquids	1,097			1,914		1,241
Operating income (loss)	(712		)	586		322
Net income (loss)	(752		)	530		289

Reconciliation of Equity in Earnings of Unconsolidated Affiliates [Table Text Block]

The following table reconciles OGE Energy's equity in earnings of its unconsolidated affiliates for the years ended December 31, 2015 and 2014.



	Year Ended December 31,
(In millions)	2015			2014
OGE's share of Enable Net Income (Loss)	$	(16.0	)	$	143.1
Amortization of basis difference	13.5			14.0
Elimination of Enogex Holdings fair value and other adjustments	18.0			15.5
Equity in earnings of unconsolidated affiliates	$	15.5		$	172.6