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Condensed Consolidated Balance Sheets - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Assets    
Property, plant and equipment, at cost $ 17,268,011 $ 16,275,377
Less: accumulated depreciation 3,368,492 3,131,901
Net property, plant and equipment 13,899,519 13,143,476
Current assets:    
Cash and cash equivalents 6,397 9,156
Accounts receivable, net 154,688 166,522
Unbilled revenues 88,284 142,310
Inventory - materials and supplies 51,997 48,619
Inventory - gas stored 71,647 45,311
Prepayments and other current assets 28,171 41,139
Regulatory assets 32,386 32,854
Total current assets 433,570 485,911
Regulatory assets 2,051,409 1,907,786
Deferred charges and other assets, net 128,401 112,712
Funds restricted for construction activity 1,439 1,420
Goodwill 2,348,559 2,340,713
Operating lease right-of-use assets 27,200 31,263
Intangible assets 3,035 3,273
Total assets 18,893,132 18,026,554
Stockholders' equity:    
Common stock at $0.50 par value, authorized 600,000,000 shares, issued 286,390,638 and 278,209,660 as of September 30, 2025 and December 31, 2024 143,195 139,105
Capital in excess of par value 4,519,304 4,199,836
Retained earnings 2,244,995 1,949,492
Treasury stock, at cost, 3,429,012 and 3,386,069 shares as of September 30, 2025 and December 31, 2024 (91,195) (89,624)
Total stockholders' equity 6,816,299 6,198,809
Long-term debt, excluding current portion 7,742,240 7,416,289
Less: debt issuance costs and unamortized discount on debt 50,149 47,908
Long-term debt, excluding current portion, net of debt issuance costs and unamortized discount on debt 7,692,091 7,368,381
Commitments and contingencies (See Note 15)
Current liabilities:    
Current portion of long-term debt 135,763 142,807
Loans payable 96,366 186,542
Accounts payable 197,258 258,615
Book overdraft 29,246 47,714
Accrued interest 92,778 72,281
Accrued taxes 27,156 38,219
Regulatory liabilities 740 1,770
Dividends payable   89,441
Other accrued liabilities 148,803 137,279
Total current liabilities 728,110 974,668
Deferred credits and other liabilities:    
Deferred income taxes and investment tax credits 2,011,269 1,831,868
Customers' advances for construction 117,396 113,323
Regulatory liabilities 720,511 764,745
Operating lease liabilities 23,004 27,447
Pension and other postretirement benefit liabilities 36,025 33,680
Other 53,519 24,788
Total deferred credits and other liabilities 2,961,724 2,795,851
Contributions in aid of construction 694,908 688,845
Total liabilities and equity $ 18,893,132 $ 18,026,554