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Quarterly Consolidated Financial Data (unaudited)
 12 Months Ended
Dec. 31, 2019
Quarterly Financial Information Disclosure [Abstract]  
Quarterly Consolidated Financial Data (unaudited)
Quarterly Consolidated Financial Data (unaudited)
Our quarterly operating results have fluctuated in the past and may continue to do so in the future as a result of a number of factors, including, but not limited to, our restructuring activities (including asset sales and dispositions), the completion of development projects, the timing and amount of curtailment of operations under the terms of certain PPAs, the degree of risk management and marketing, hedging, optimization and trading activities, energy commodity market prices and variations in levels of production. Furthermore, the majority of the dollar value of capacity payments under certain of our PPAs are received during the months of May through October.
 
Quarter Ended
 
December 31
 
September 30
 
June 30
 
March 31
 
(in millions)
2019
 
 
 
 
 
 
 
Operating revenues
$
2,082

 
$
2,792

 
$
2,599

 
$
2,599

Income from operations
$
108

 
$
682

 
$
444

 
$
358

Net income (loss) attributable to Calpine
$
(156
)
 
$
485

 
$
266

 
$
175

 
 
 
 
 
 
 
 
2018
 
 
 
 
 
 
 
Operating revenues
$
2,354

 
$
2,890

 
$
2,259

 
$
2,009

Income (loss) from operations
$
105

 
$
568

 
$
417

 
$
(328
)
Net income (loss) attributable to Calpine
$
(16
)
 
$
272

 
$
352

 
$
(598
)