CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Property, Plant and Equipment
Regulated utility plant, at cost	$ 2,433,884	$ 2,321,712
Non-utility property, at cost	39,239	38,285
Total	2,473,123	2,359,997
Less - Accumulated depreciation	(622,652)	(606,231)
Net property, plant and equipment	1,850,471	1,753,766
Other Property and Investments
Goodwill	1,116	1,116
Other property and investments	37,767	36,907
Total other property and investments	38,883	38,023
Current Assets
Cash and cash equivalents	8,604	5,997
Accounts receivable - customers, less allowance for doubtful accounts	32,600	26,206
Unbilled receivable	24,248	20,663
Receivable from the U.S. government (Note 2)	51,564	34,974
Other accounts receivable, less allowance for doubtful accounts	6,755	4,215
Income taxes receivable	59	3,901
Materials and supplies	16,218	14,623
Regulatory assets — current	32,355	14,028
Prepayments and other current assets	6,525	5,450
Purchase power contract derivative at fair value (Note 5)	1,525	11,847
Contract assets (Note 2)	11,232	9,390
Total current assets	191,685	151,294
Other Assets
Unbilled revenue — receivable from the U.S. government (Note 2)	5,854	6,456
Receivable from the U.S. government (Note 2)	44,480	50,482
Contract assets (Note 2)	2,776	5,592
Operating lease right-of-use assets	8,512	9,535
Regulatory assets	47,557	5,694
Other	15,011	13,532
Total other assets	124,190	91,291
Total Assets	2,205,229	2,034,374
Capitalization
Common stock, value, issued	262,884	260,158
Earnings reinvested in the business	508,453	449,391
Total common shareholders’ equity	771,337	709,549
Long-term debt	575,459	446,547
Total capitalization	1,346,796	1,156,096
Current Liabilities
Notes payable to banks	37,000	255,500
Long-term debt — current	353	399
Accounts payable	71,829	84,849
Accrued other taxes	17,369	16,257
Accrued employee expenses	14,817	13,996
Accrued interest	8,952	5,308
Income taxes payable	28,627	1,848
Regulatory liabilities	2,245	4,574
Contract liabilities (Note 2)	596	903
Operating lease liabilities	1,909	1,892
Other	11,310	10,996
Total current liabilities	195,007	396,522
Other Credits
Notes payable to banks	236,500	22,000
Advances for construction	63,961	64,351
Contributions in aid of construction - net	149,586	147,918
Deferred income taxes	156,438	149,677
Regulatory liabilities	0	40,602
Unamortized investment tax credits	1,028	1,082
Accrued pension and other postretirement benefits	34,111	33,636
Operating lease liabilities	7,087	8,090
Other	14,715	14,400
Total other credits	663,426	481,756
Commitments and Contingencies (Note 9)
Total Capitalization and Liabilities	$ 2,205,229	$ 2,034,374
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)	36,980,592	36,962,241
GSWC
Property, Plant and Equipment
Total	$ 2,239,809	$ 2,147,643
Less - Accumulated depreciation	(542,886)	(530,925)
Net property, plant and equipment	1,696,923	1,616,718
Other Property and Investments
Total other property and investments	35,524	34,655
Current Assets
Cash and cash equivalents	88	370
Accounts receivable - customers, less allowance for doubtful accounts	30,352	23,107
Unbilled receivable	18,351	15,006
Other accounts receivable, less allowance for doubtful accounts	2,342	2,721
Income taxes receivable	0	1,692
Materials and supplies	6,495	6,120
Regulatory assets — current	32,355	14,028
Prepayments and other current assets	4,915	4,464
Total current assets	95,426	68,129
Other Assets
Operating lease right-of-use assets	8,292	9,208
Regulatory assets	28,511	0
Other	13,329	12,598
Total other assets	50,132	21,806
Total Assets	1,878,005	1,741,308
Capitalization
Common stock, value, issued	370,680	358,123
Earnings reinvested in the business	317,845	285,783
Total common shareholders’ equity	688,525	643,906
Long-term debt	540,646	411,748
Total capitalization	1,229,171	1,055,654
Current Liabilities
Long-term debt — current	353	399
Accounts payable	58,380	65,944
Accrued other taxes	15,197	14,501
Accrued employee expenses	11,695	11,233
Accrued interest	7,449	4,364
Income taxes payable	27,314	0
Operating lease liabilities	1,783	1,788
Other	10,806	10,152
Total current liabilities	132,977	108,381
Other Credits
Notes payable to banks	0	129,000
Other Notes Payable, Noncurrent	103,000	0
Advances for construction	63,941	64,331
Contributions in aid of construction - net	149,586	147,918
Deferred income taxes	142,932	138,788
Regulatory liabilities	0	40,602
Unamortized investment tax credits	1,028	1,082
Accrued pension and other postretirement benefits	33,820	33,421
Operating lease liabilities	6,998	7,878
Other	14,552	14,253
Total other credits	515,857	577,273
Commitments and Contingencies (Note 9)
Total Capitalization and Liabilities	$ 1,878,005	$ 1,741,308
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)	171	170
GSWC | Related Party
Current Assets
Intercompany receivable	$ 528	$ 621