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Inventories and natural gas in storage (Tables)
6 Months Ended
Jun. 30, 2025
Inventory Disclosure [Abstract]  
Schedule of Inventories Inventories on the Consolidated Balance Sheets were as follows:
 June 30, 2025June 30, 2024December 31, 2024
 (In thousands)
Natural gas in storage (current)$14,937 $16,363 $40,073 
Fuel stock4,776 4,799 4,867 
Total$19,713 $21,162 $44,940