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Related-Party Transactions Related-Party Transactions
 3 Months Ended
Mar. 31, 2016
Related Party Transaction [Line Items]  
Related Party Transactions Disclosure [Text Block]
Related Party Transactions
 
OGE Energy charged operating costs to OG&E of $31.9 million and $31.2 million during the three months ended March 31, 2016 and 2015, 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 contract with Enable to provide gas transportation services effective May 1, 2014. 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 three months ended March 31, 2016 and 2015.

 
Three Months Ended March 31,
(In millions)
2016
2015
Operating Revenues:
 
 
Electricity to power electric compression assets
$
2.3

$
3.1

Cost of Sales:
 
 
Natural gas transportation services
$
8.8

$
8.8

Natural gas purchases/(sales)
1.5

2.5



During the three months ended March 31, 2016 and 2015, OG&E declared dividends to OGE Energy of $30.0 million.