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Related-Party Transactions Related-Party Transactions
 12 Months Ended
Dec. 31, 2015
Related Party Transaction [Line Items]  
Related Party Transactions Disclosure [Text Block]
Related Party Transactions
 
OGE Energy charged operating costs to OG&E of $123.0 million, $120.3 million and $120.1 million in 2015, 2014 and 2013, respectively. OGE Energy charges operating costs to OG&E based on several factors. Operating costs directly related to OG&E are assigned as such.  Operating costs incurred for the benefit of OG&E are allocated either as overhead based primarily on labor costs or using the "Distrigas" method.  

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 2013.

Year Ended December 31, (In millions)
2015
2014
2013
Operating Revenues:
 
 
 
Electricity to power electric compression assets
$
13.8

$
13.3

$
10.2

Cost of Sales:
 
 
 
Natural gas transportation services
$
35.0

$
34.9

$
34.8

Natural gas storage services
—

4.4

12.9

Natural gas purchases/(sales)
7.6

8.7

22.4



In 2015, 2014 and 2013, OG&E declared dividends to OGE Energy of $120.0 million, $120.0 million and $170.0 million, respectively.