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Summary of Significant Accounting Policies (Tables)
12 Months Ended
Dec. 31, 2021
Accounting Policies [Abstract]  
Schedule of property, plant and equipment
Pinnacle West’s property, plant and equipment included in the December 31, 2021, and 2020 Consolidated Balance Sheets is composed of the following (dollars in thousands):

Property, Plant and Equipment:20212020
Generation$9,480,572 $9,199,012 
Transmission3,402,016 3,290,477 
Distribution7,520,016 7,107,007 
General plant1,286,057 1,241,389 
Plant in service and held for future use
21,688,661 20,837,885 
Accumulated depreciation and amortization(7,504,603)(7,110,310)
Net
14,184,058 13,727,575 
Construction work in progress1,329,478 937,384 
Palo Verde sale leaseback, net of accumulated depreciation94,166 98,036 
Intangible assets, net of accumulated amortization273,693 282,570 
Nuclear fuel, net of accumulated amortization106,039 113,645 
Total property, plant and equipment$15,987,434 $15,159,210 
Summary of supplemental cash flow information
The following table summarizes supplemental Pinnacle West cash flow information for each of the last three years (dollars in thousands):
 Year ended December 31,
 202120202019
Cash paid (received) during the period for:   
Income taxes, net of refunds$229 $(3,019)$12,535 
Interest, net of amounts capitalized227,584 216,951 218,664 
Significant non-cash investing and financing activities:   
Accrued capital expenditures$167,733 $113,502 $141,297 
Dividends declared but not paid95,988 93,531 87,982 

The following table summarizes supplemental APS cash flow information for each of the last three years (dollars in thousands):
 Year ended December 31,
 202120202019
Cash paid (received) during the period for:   
Income taxes, net of refunds$19,783 $41,176 $(15,042)
Interest, net of amounts capitalized217,749 206,328 204,261 
Significant non-cash investing and financing activities:   
Accrued capital expenditures$167,657 $113,502 $141,297 
Dividends declared but not paid96,000 93,500 88,000