CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Property, Plant and Equipment
Regulated utility plant, at cost	$ 2,391,596	$ 2,321,712
Non-utility property, at cost	39,180	38,285
Total	2,430,776	2,359,997
Less - Accumulated depreciation	(616,715)	(606,231)
Net property, plant and equipment	1,814,061	1,753,766
Other Property and Investments
Goodwill	1,116	1,116
Other property and investments	39,889	36,907
Total other property and investments	41,005	38,023
Current Assets
Cash and cash equivalents	1,026	5,997
Accounts receivable - customers, less allowance for doubtful accounts	27,000	26,206
Unbilled receivable	21,230	20,663
Receivable from the U.S. government (Note 2)	47,301	34,974
Other accounts receivable, less allowance for doubtful accounts	4,636	4,215
Income taxes receivable	74	3,901
Materials and supplies	16,822	14,623
Regulatory assets — current	25,360	14,028
Prepayments and other current assets	9,174	5,450
Purchase power contract derivative at fair value (Note 5)	4,657	11,847
Contract assets (Note 2)	11,630	9,390
Total current assets	168,910	151,294
Other Assets
Unbilled revenue — receivable from the U.S. government (Note 2)	6,822	6,456
Receivable from the U.S. government (Note 2)	49,077	50,482
Contract assets (Note 2)	3,880	5,592
Operating lease right-of-use assets	8,475	9,535
Regulatory assets	32,574	5,694
Other	14,831	13,532
Total other assets	115,659	91,291
Total Assets	2,139,635	2,034,374
Capitalization
Common stock, value, issued	262,230	260,158
Earnings reinvested in the business	492,836	449,391
Total common shareholders’ equity	755,066	709,549
Long-term debt	576,376	446,547
Total capitalization	1,331,442	1,156,096
Current Liabilities
Notes payable to banks	0	255,500
Long-term debt — current	414	399
Accounts payable	70,678	84,849
Accrued other taxes	14,542	16,257
Accrued employee expenses	12,741	13,996
Accrued interest	7,801	5,308
Income taxes payable	19,453	1,848
Regulatory liabilities	1,624	4,574
Contract liabilities (Note 2)	585	903
Operating lease liabilities	1,880	1,892
Other	11,212	10,996
Total current liabilities	140,930	396,522
Other Credits
Notes payable to banks	243,000	22,000
Advances for construction	63,520	64,351
Contributions in aid of construction - net	148,660	147,918
Deferred income taxes	153,386	149,677
Regulatory liabilities	0	40,602
Unamortized investment tax credits	1,046	1,082
Accrued pension and other postretirement benefits	35,961	33,636
Operating lease liabilities	7,078	8,090
Other	14,612	14,400
Total other credits	667,263	481,756
Commitments and Contingencies (Note 9)
Total Capitalization and Liabilities	$ 2,139,635	$ 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)	36,976,599	36,962,241
GSWC
Property, Plant and Equipment
Total	$ 2,205,129	$ 2,147,643
Less - Accumulated depreciation	(538,429)	(530,925)
Net property, plant and equipment	1,666,700	1,616,718
Other Property and Investments
Total other property and investments	37,643	34,655
Current Assets
Cash and cash equivalents	367	370
Accounts receivable - customers, less allowance for doubtful accounts	24,621	23,107
Unbilled receivable	15,376	15,006
Other accounts receivable, less allowance for doubtful accounts	2,774	2,721
Income taxes receivable	0	1,692
Materials and supplies	6,505	6,120
Regulatory assets — current	25,360	14,028
Prepayments and other current assets	6,699	4,464
Total current assets	82,160	68,129
Other Assets
Operating lease right-of-use assets	8,222	9,208
Regulatory assets	19,445	0
Other	13,245	12,598
Total other assets	40,912	21,806
Total Assets	1,827,415	1,741,308
Capitalization
Common stock, value, issued	370,129	358,123
Earnings reinvested in the business	307,296	285,783
Total common shareholders’ equity	677,425	643,906
Long-term debt	541,568	411,748
Total capitalization	1,218,993	1,055,654
Current Liabilities
Long-term debt — current	414	399
Accounts payable	58,151	65,944
Accrued other taxes	12,908	14,501
Accrued employee expenses	10,183	11,233
Accrued interest	7,031	4,364
Income taxes payable	18,798	0
Operating lease liabilities	1,759	1,788
Other	10,112	10,152
Total current liabilities	119,356	108,381
Other Credits
Notes payable to banks	0	129,000
Other Notes Payable, Noncurrent	78,000	0
Advances for construction	63,500	64,331
Contributions in aid of construction - net	148,660	147,918
Deferred income taxes	140,762	138,788
Regulatory liabilities	0	40,602
Unamortized investment tax credits	1,046	1,082
Accrued pension and other postretirement benefits	35,695	33,421
Operating lease liabilities	6,952	7,878
Other	14,451	14,253
Total other credits	489,066	577,273
Commitments and Contingencies (Note 9)
Total Capitalization and Liabilities	$ 1,827,415	$ 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	$ 458	$ 621