CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Property, Plant and Equipment
Regulated utility plant, at cost	$ 2,357,966	$ 2,321,712
Non-utility property, at cost	38,898	38,285
Total	2,396,864	2,359,997
Less - Accumulated depreciation	(616,403)	(606,231)
Net property, plant and equipment	1,780,461	1,753,766
Other Property and Investments
Goodwill	1,116	1,116
Other property and investments	38,408	36,907
Total other property and investments	39,524	38,023
Current Assets
Cash and cash equivalents	2,126	5,997
Accounts receivable - customers, less allowance for doubtful accounts	21,293	26,206
Unbilled receivable	22,444	20,663
Receivable from the U.S. government (Note 2)	41,091	34,974
Other accounts receivable, less allowance for doubtful accounts	3,391	4,215
Income taxes receivable	35	3,901
Materials and supplies, at weighted average cost	16,282	14,623
Regulatory assets — current	11,032	14,028
Prepayments and other current assets	11,690	5,450
Purchase power contract derivative at fair value (Note 5)	6,669	11,847
Contract assets (Note 2)	3,637	9,390
Total current assets	139,690	151,294
Other Assets
Unbilled revenue — receivable from the U.S. government (Note 2)	7,790	6,456
Receivable from the U.S. government (Note 2)	50,207	50,482
Contract assets (Note 2)	9,836	5,592
Operating lease right-of-use assets	8,990	9,535
Regulatory assets	10,474	5,694
Other	13,400	13,532
Total other assets	100,697	91,291
Total Assets	2,060,372	2,034,374
Capitalization
Common stock, value, issued	261,792	260,158
Retained earnings	469,056	449,391
Total common shareholders’ equity	730,848	709,549
Long-term debt	576,431	446,547
Total capitalization	1,307,279	1,156,096
Current Liabilities
Notes payable to banks	175,500	255,500
Long-term debt — current	404	399
Accounts payable	65,705	84,849
Income taxes payable	10,855	1,848
Accrued other taxes	14,257	16,257
Accrued employee expenses	17,390	13,996
Accrued interest	8,411	5,308
Regulatory liabilities	2,097	4,574
Contract liabilities (Note 2)	560	903
Operating lease liabilities	1,906	1,892
Other	10,605	10,996
Total current liabilities	307,690	396,522
Other Credits
Notes payable to banks	25,000	22,000
Advances for construction	64,097	64,351
Contributions in aid of construction - net	148,456	147,918
Deferred income taxes	148,138	149,677
Regulatory liabilities	1,783	40,602
Unamortized investment tax credits	1,064	1,082
Accrued pension and other postretirement benefits	34,796	33,636
Operating lease liabilities	7,559	8,090
Other	14,510	14,400
Total other credits	445,403	481,756
Commitments and Contingencies (Note 9)
Total Capitalization and Liabilities	$ 2,060,372	$ 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)	36,976,284	36,962,241
GSWC
Property, Plant and Equipment
Total	$ 2,177,606	$ 2,147,643
Less - Accumulated depreciation	(539,575)	(530,925)
Net property, plant and equipment	1,638,031	1,616,718
Other Property and Investments
Total other property and investments	36,159	34,655
Current Assets
Cash and cash equivalents	813	370
Accounts receivable - customers, less allowance for doubtful accounts	18,697	23,107
Unbilled receivable	13,399	15,006
Other accounts receivable, less allowance for doubtful accounts	2,316	2,721
Income taxes receivable	0	1,692
Materials and supplies, at weighted average cost	6,338	6,120
Intercompany receivable	0	621
Regulatory assets — current	11,032	14,028
Prepayments and other current assets	8,347	4,464
Total current assets	60,942	68,129
Other Assets
Operating lease right-of-use assets	8,703	9,208
Other	12,535	12,598
Total other assets	21,238	21,806
Total Assets	1,756,370	1,741,308
Capitalization
Common stock, value, issued	369,770	358,123
Retained earnings	288,502	285,783
Total common shareholders’ equity	658,272	643,906
Long-term debt	541,627	411,748
Total capitalization	1,199,899	1,055,654
Current Liabilities
Intercompany payable	428	0
Intercompany note payable	45,000	0
Long-term debt — current	404	399
Accounts payable	47,860	65,944
Income taxes payable	10,394	0
Accrued other taxes	12,248	14,501
Accrued employee expenses	13,841	11,233
Accrued interest	7,144	4,364
Operating lease liabilities	1,794	1,788
Other	9,754	10,152
Total current liabilities	148,867	108,381
Other Credits
Notes Payable, Related Parties, Noncurrent	0	129,000
Advances for construction	64,077	64,331
Contributions in aid of construction - net	148,456	147,918
Deferred income taxes	135,921	138,788
Regulatory liabilities	1,783	40,602
Unamortized investment tax credits	1,064	1,082
Accrued pension and other postretirement benefits	34,556	33,421
Operating lease liabilities	7,397	7,878
Other	14,350	14,253
Total other credits	407,604	577,273
Commitments and Contingencies (Note 9)
Total Capitalization and Liabilities	$ 1,756,370	$ 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