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Summary of significant accounting policies - Related parties (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2023
USD ($)
member
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Related parties      
Number of electric distribution cooperative members 38    
Related Party | Georgia Transmission Corporation      
Related parties      
Number of electric distribution cooperative members 38    
General and administrative expense | $ $ 41,426 $ 40,774 $ 39,677
Related Party | Georgia System Operations Corporation      
Related parties      
Number of electric distribution cooperative members 38    
General and administrative expense | $ $ 30,109 $ 27,416 $ 26,936