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Unaudited summarized quarterly information (Tables)
 12 Months Ended
Dec. 31, 2024
Quarterly Financial Information Disclosure [Abstract]  
Schedule of Selected Quarterly Information
The unaudited quarterly financial information for the years 2024 and 2023 has been recast for discontinued operations presentation as discussed in Note 5 and is summarized below.
(in thousands, except per share amounts)1Q242Q243Q244Q242024
   
Revenues   
Electric utility$788,578 $792,331 $829,617 $796,174 $3,206,700 
Other3,436 3,086 3,622 3,006 13,150 
Total revenues792,014 795,417 833,239 799,180 3,219,850 
Operating income (loss)
Electric utility63,355 (1,644,440)(104,564)73,791 (1,611,858)
Other(12,468)(17,149)(45,156)(20,129)(94,902)
Total operating income (loss)50,887 (1,661,589)(149,720)53,662 (1,706,760)
Income (loss) from continuing operations for common stock
21,188 (1,249,697)(123,180)29,166 (1,322,523)
Income (loss) from discontinued operations
20,934 (45,787)18,778 (97,411)(103,486)
Net income (loss) for common stock
$42,122 $(1,295,484)$(104,402)$(68,245)$(1,426,009)
Continuing operations - Basic earnings (loss) per common share
$0.19 $(11.33)$(1.08)$0.17 $(10.42)
Discontinued operations - Basic earnings (loss) per common share
0.19 (0.42)0.16 (0.56)(0.81)
Basic earnings (loss) per common share$0.38 $(11.74)$(0.91)$(0.40)$(11.23)
Continuing operations - Diluted earnings (loss) per common share
$0.19 $(11.33)$(1.08)$0.17 $(10.42)
Discontinued operations - Diluted earnings (loss) per common share
0.19 (0.42)0.16 (0.56)(0.81)
Diluted earnings (loss) per common share$0.38 $(11.74)$(0.91)$(0.40)$(11.23)
Weighted-average number of common shares outstanding110,218 110,303 114,358 172,466 126,927 
Weighted-average shares assuming dilution110,476 110,303 114,358 172,466 126,927 
(in thousands, except per share amounts)1Q232Q233Q234Q232023
   
Revenues   
Electric utility$830,361 $794,191 $794,987 $849,982 $3,269,521 
Other4,019 4,609 5,912 3,442 17,982 
Total revenues834,380 798,800 800,899 853,424 3,287,503 
Operating income (loss)
Electric utility75,875 73,625 71,358 81,300 302,158 
Other(5,877)(5,514)(8,806)(6,969)(27,166)
Total operating income (loss)69,998 68,111 62,552 74,331 274,992 
Income from continuing operations for common stock
36,159 34,406 29,753 45,558 145,876 
Income from discontinued operations
18,562 20,204 11,365 3,231 53,362 
Net income (loss) for common stock
$54,721 $54,610 $41,118 $48,789 $199,238 
Continuing operations - Basic earnings per common share$0.33 $0.31 $0.27 $0.41 $1.33 
Discontinued operations - Basic earnings per common share0.17 0.18 0.10 0.03 0.49 
Basic earnings per common share
$0.50 $0.50 $0.37 $0.44 $1.82 
Continuing operations - Diluted earnings per common share$0.33 $0.31 $0.27 $0.41 $1.33 
Discontinued operations - Diluted earnings per common share0.17 0.18 0.10 0.03 0.48 
Diluted earnings per common share
$0.50 $0.50 $0.37 $0.44 $1.81 
Weighted-average number of common shares outstanding109,514 109,573 109,728 110,134 109,739 
Weighted-average shares assuming dilution109,825 109,780 109,917 110,301 110,038