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CONSOLIDATED BALANCE SHEETS - USD ($)
$ in Thousands
Mar. 31, 2025
Dec. 31, 2024
Property, Plant and Equipment    
Regulated utility plant, at cost $ 2,744,705 $ 2,703,127
Non-utility property, at cost 46,314 44,697
Total 2,791,019 2,747,824
Less - accumulated depreciation (653,528) (648,199)
Net property, plant and equipment 2,137,491 2,099,625
Property, Plant and Equipment, Other, Net [Abstract]    
Other property and investments 49,720 50,418
Current Assets    
Cash and cash equivalents 21,229 26,661
Accounts receivable - customers, less allowance for doubtful accounts 34,013 37,699
Unbilled receivable 35,645 28,446
Receivable from the U.S. government (Note 2) 35,944 41,000
Other accounts receivable, less allowance for doubtful accounts 3,768 6,415
Income taxes receivable, current 30 65
Materials and supplies 15,516 15,140
Regulatory assets — current 54,242 50,504
Prepayments and other current assets 13,729 7,286
Contract assets (Note 2) 24,120 20,130
Total current assets 238,236 233,346
Other Assets    
Unbilled revenue — receivable from the U.S. government (Note 2) 2,801 3,423
Receivable from the U.S. government (Note 2) 35,356 35,486
Contract assets (Note 2) 428 1,518
Operating lease right-of-use assets 7,463 8,028
Regulatory assets 32,517 27,101
Other 41,441 41,264
Total other assets 120,006 116,820
Total Assets 2,545,453 2,500,209
Capitalization    
Common shares, no par value 382,480 355,143
Retained earnings 573,927 564,908
Total common shareholders’ equity 956,407 920,051
Long-term debt 690,208 640,382
Total capitalization 1,646,615 1,560,433
Current Liabilities    
Notes payable to banks 143,000 124,000
Long-term debt — current 390 385
Accounts payable 67,771 88,591
Income taxes payable 6,756 481
Accrued other taxes 13,656 16,694
Accrued employee expenses 18,640 15,523
Accrued interest 9,798 8,133
Contract liabilities (Note 2) 7,747 5,662
Operating lease liabilities 2,032 2,074
Purchase power contract derivative at fair value (Note 5) 13,094 8,823
Other 11,412 15,159
Total current liabilities 294,296 285,525
Other Credits    
Notes payable to banks 106,000 165,000
Advances for construction 69,926 69,856
Contributions in aid of construction – net 161,497 160,306
Deferred income taxes 183,787 180,173
Regulatory liabilities 27,167 22,926
Unamortized investment tax credits 925 942
Accrued pension and other postretirement benefits 34,432 33,816
Operating lease liabilities 5,861 6,394
Other 14,947 14,838
Total other credits 604,542 654,251
Commitments and Contingencies (Note 9)
Total Capitalization and Liabilities $ 2,545,453 $ 2,500,209
Consolidated Balance Sheets (Parenthetical)    
Common Stock, Par Value (in usd per share) $ 0 $ 0
Common Stock, Shares Authorized (in shares) 60,000,000 60,000,000
Common Stock, Shares, Outstanding (in shares) 38,508,589 38,151,027
GSWC    
Property, Plant and Equipment    
Total $ 2,510,240 $ 2,472,625
Less - accumulated depreciation (565,342) (561,256)
Net property, plant and equipment 1,944,898 1,911,369
Property, Plant and Equipment, Other, Net [Abstract]    
Other property and investments 47,058 47,753
Current Assets    
Cash and cash equivalents 8,773 11,338
Accounts receivable - customers, less allowance for doubtful accounts 30,350 34,712
Unbilled receivable 18,421 19,417
Other accounts receivable, less allowance for doubtful accounts 2,569 3,122
Income taxes receivable, current 0 3,253
Intercompany receivable 900 120
Materials and supplies 7,447 7,543
Regulatory assets — current 44,388 41,099
Prepayments and other current assets 9,972 5,880
Total current assets 122,820 126,484
Other Assets    
Operating lease right-of-use assets 7,451 7,981
Other 38,764 38,394
Total other assets 46,215 46,375
Total Assets 2,160,991 2,131,981
Capitalization    
Common shares, no par value 415,488 413,797
Retained earnings 411,885 392,036
Total common shareholders’ equity 827,373 805,833
Long-term debt 605,554 605,547
Total capitalization 1,432,927 1,411,380
Current Liabilities    
Notes payable to banks 143,000 124,000
Long-term debt — current 390 385
Accounts payable 52,722 70,896
Income taxes payable 1,940 0
Accrued other taxes 11,038 14,285
Accrued employee expenses 14,656 12,271
Accrued interest 8,387 7,438
Operating lease liabilities 2,032 2,036
Other 10,620 14,468
Total current liabilities 244,785 245,779
Other Credits    
Advances for construction 69,906 69,836
Contributions in aid of construction – net 161,497 160,306
Deferred income taxes 169,223 166,410
Regulatory liabilities 27,167 22,926
Unamortized investment tax credits 925 942
Accrued pension and other postretirement benefits 33,933 33,351
Operating lease liabilities 5,861 6,394
Other 14,767 14,657
Total other credits 483,279 474,822
Commitments and Contingencies (Note 9)
Total Capitalization and Liabilities $ 2,160,991 $ 2,131,981
Consolidated Balance Sheets (Parenthetical)    
Common Stock, Par Value (in usd per share) $ 0 $ 0
Common Stock, Shares Authorized (in shares) 1,000 1,000
Common Stock, Shares, Outstanding (in shares) 173.7586 173.7586