CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Property, Plant and Equipment
Regulated utility plant, at cost	$ 2,525,055	$ 2,476,509
Non-utility property, at cost	41,236	40,243
Total	2,566,291	2,516,752
Less - accumulated depreciation	(632,597)	(624,472)
Net property, plant and equipment	1,933,694	1,892,280
Other Property and Investments
Goodwill	1,116	1,116
Other property and investments	44,896	42,932
Total other property and investments	46,012	44,048
Current Assets
Cash and cash equivalents	17,007	14,073
Accounts receivable - customers, less allowance for doubtful accounts	28,897	34,250
Unbilled receivable	24,733	23,516
Receivable from the U.S. government (Note 2)	43,153	49,306
Other accounts receivable, less allowance for doubtful accounts	4,492	6,340
Materials and supplies	16,225	17,574
Regulatory assets — current	44,652	45,144
Prepayments and other current assets	11,777	5,819
Contract assets (Note 2)	14,155	9,956
Total current assets	205,091	205,978
Other Assets
Unbilled revenue — receivable from the U.S. government (Note 2)	5,933	4,886
Receivable from the U.S. government (Note 2)	41,420	42,183
Contract assets (Note 2)	329	4,422
Operating lease right-of-use assets	7,452	7,982
Regulatory assets	34,040	25,585
Other	18,925	18,758
Total other assets	108,099	103,816
Total Assets	2,292,896	2,246,122
Capitalization
Common stock, value, issued	280,377	263,179
Retained earnings	520,116	512,930
Total common shareholders’ equity	800,493	776,109
Long-term debt	575,530	575,555
Total capitalization	1,376,023	1,351,664
Current Liabilities
Notes payable to banks	43,000	42,000
Long-term debt — current	358	353
Accounts payable	69,584	68,705
Accrued other taxes	12,581	14,654
Accrued employee expenses	18,428	14,738
Accrued interest	9,003	8,607
Income taxes payable	5,105	492
Contract liabilities (Note 2)	653	1,352
Operating lease liabilities	1,788	1,856
Purchase power contract derivative at fair value (Note 5)	6,168	2,360
Other	11,909	11,506
Total current liabilities	178,577	166,623
Other Credits
Notes payable to banks	294,500	291,500
Advances for construction	69,468	67,431
Contributions in aid of construction - net	152,026	151,414
Deferred income taxes	166,027	161,577
Regulatory liabilities	1,123	1,222
Unamortized investment tax credits	993	1,011
Accrued pension and other postretirement benefits	33,504	32,652
Operating lease liabilities	6,138	6,619
Other	14,517	14,409
Total other credits	738,296	727,835
Commitments and Contingencies (Note 9)
Total Capitalization and Liabilities	$ 2,292,896	$ 2,246,122
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)	37,228,883	36,980,612
GSWC
Property, Plant and Equipment
Total	$ 2,321,389	$ 2,278,669
Less - accumulated depreciation	(549,706)	(543,135)
Net property, plant and equipment	1,771,683	1,735,534
Other Property and Investments
Total other property and investments	42,447	40,480
Current Assets
Cash and cash equivalents	7,470	3,195
Accounts receivable - customers, less allowance for doubtful accounts	25,736	31,018
Unbilled receivable	15,199	17,185
Other accounts receivable, less allowance for doubtful accounts	3,146	4,301
Intercompany receivable	1,223	380
Income Taxes Receivable, Current	0	222
Materials and supplies	7,679	7,380
Regulatory assets — current	44,434	44,007
Prepayments and other current assets	8,330	4,544
Total current assets	113,217	112,232
Other Assets
Operating lease right-of-use assets	7,300	7,796
Regulatory assets	8,237	2,944
Other	17,175	17,169
Total other assets	32,712	27,909
Total Assets	1,960,059	1,916,155
Capitalization
Common stock, value, issued	372,511	370,909
Retained earnings	350,672	332,919
Total common shareholders’ equity	723,183	703,828
Long-term debt	540,709	540,738
Total capitalization	1,263,892	1,244,566
Current Liabilities
Long-term debt — current	358	353
Accounts payable	55,263	55,488
Accrued other taxes	10,328	12,658
Accrued employee expenses	14,140	11,502
Accrued interest	7,561	7,508
Income taxes payable	3,040	0
Operating lease liabilities	1,650	1,725
Other	11,123	10,715
Total current liabilities	103,463	99,949
Other Credits
Notes payable to banks	164,000	150,000
Advances for construction	69,448	67,411
Contributions in aid of construction - net	152,026	151,414
Deferred income taxes	151,506	147,458
Regulatory liabilities	1,123	1,222
Unamortized investment tax credits	993	1,011
Accrued pension and other postretirement benefits	33,131	32,309
Operating lease liabilities	6,125	6,568
Other	14,352	14,247
Total other credits	592,704	571,640
Commitments and Contingencies (Note 9)
Total Capitalization and Liabilities	$ 1,960,059	$ 1,916,155
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	171