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Earnings Per Share and Equity Forward Sale Agreements (Tables)
 9 Months Ended
Sep. 30, 2024
Earnings Per Share [Abstract]  
Schedule of Earnings Per Weighted Average Common Share Outstanding
The following table presents the calculation of Pinnacle West’s basic and diluted EPS (in thousands, except per share amounts):
 Three Months Ended September 30,Nine Months Ended September 30,
 2024202320242023
Net income attributable to common shareholders
$394,966 $398,214 $615,633 $501,580 
Weighted average common shares outstanding — basic
113,729 113,464 113,682 113,411 
Net effect of dilutive securities:
Contingently issuable performance shares and restricted stock units636 374 484 307 
Dilutive shares related to equity forward sale agreements2,754 — 1,551 — 
Total contingently issuable shares3,390 374 2,035 307 
Weighted average common shares outstanding — diluted
117,119 113,838 115,717 113,718 
Earnings per weighted-average common share outstanding:
Net income attributable to common shareholders — basic
$3.47 $3.51 $5.42 $4.42 
Net income attributable to common shareholders — diluted
$3.37 $3.50 $5.32 $4.41