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Related-Party Transactions Related-Party Transactions
12 Months Ended
Dec. 31, 2019
Related Party Transaction [Line Items]  
Related Party Transactions Disclosure [Text Block] Related Party Transactions
 
OGE Energy charged operating costs to OG&E of $149.8 million, $140.9 million and $134.4 million in 2019, 2018 and 2017, 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.  

In 2019, no dividends were declared from OG&E to OGE Energy, compared to $185.0 million and $105.0 million in 2018 and 2017, respectively.
Enable provides gas transportation services to OG&E pursuant to an agreement, which expires in May 2024, that 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. Further, an additional gas transportation services contract with Enable became effective in December 2018 related to the project to convert Muskogee Units 4 and 5 from coal to natural gas. The following table summarizes related party transactions between OG&E and Enable during the years ended December 31, 2019, 2018 and 2017.

Year Ended December 31,
(In millions)201920182017
Operating revenues:
Electricity to power electric compression assets$15.9  $16.3  $14.0  
Cost of sales:
Natural gas transportation services$41.2  $37.9  $35.0  
Natural gas (sales) purchases$(6.0) $(3.2) $(2.1)