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Palo Verde Palo Verde (Tables)
9 Months Ended
Sep. 30, 2018
Palo Verde Generating Station  
Jointly Owned Utility Plant Interests [Line Items]  
Schedule of Jointly Owned Utility Plants
Palo Verde Operations and Maintenance Expense. Included in "Operations and maintenance" in the Company's Statements of Operations are expenses associated with Palo Verde as follows (in thousands):
 
 
2018
 
2017
Three months ended September 30,
 
$
20,277

 
$
20,441

Nine months ended September 30,
 
67,429

 
67,980

Twelve months ended September 30,
 
98,813

 
97,380