CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Utility plant:
Land	$ 44,600	$ 44,657
Depreciable plant and equipment	4,688,644	4,249,314
Construction work in progress	269,272	179,486
Intangible assets	51,683	51,604
Total utility plant	5,054,199	4,525,061
Less: accumulated depreciation and amortization	1,120,232	1,036,450
Net utility plant	3,933,967	3,488,611
Nonutility properties	1,683	1,314
Less: accumulated depreciation and amortization	103	98
Net nonutility properties	1,580	1,216
Current assets:
Cash and cash equivalents	20,686	11,114
Accounts receivable:
Customers, net of allowances for uncollectible accounts of $722 and $1,172 in 2025 and 2024, respectively	62,471	68,679
Income tax	2,720	5,953
Other	7,710	7,059
Accrued unbilled revenue	68,971	60,847
Prepaid expenses	11,634	10,297
Current regulatory assets	8,315	18,172
Other current assets	8,086	8,593
Total current assets	190,593	190,714
Other assets:
Regulatory assets, less current portion	246,547	224,055
Investments	19,711	18,087
Postretirement benefit plans	80,967	66,422
Goodwill	640,311	640,311
Other	35,890	28,893
Total other assets	1,023,426	977,768
Total assets	5,149,566	4,658,309
Stockholders’ equity:
Common stock, $0.001 par value; authorized 70,000,000 shares in 2025 and 2024; issued and outstanding 36,118,242 shares in 2025 and 33,629,169 shares in 2024	36	34
Additional paid-in capital	958,188	827,796
Retained earnings	581,080	537,184
Accumulated other comprehensive income	1,467	1,960
Total stockholders’ equity	1,540,771	1,366,974
Long-term debt, less current portion	1,866,819	1,706,904
Total capitalization	3,407,590	3,073,878
Current liabilities:
Lines of credit	86,834	119,124
Current portion of long-term debt	23,504	3,648
Accrued groundwater extraction charges, purchased water and power	29,321	25,118
Accounts payable	75,427	56,256
Accrued interest	18,241	17,476
Accrued payroll	19,109	15,193
Current regulatory liabilities	0	1,122
Other current liabilities	20,942	23,236
Total current liabilities	273,378	261,173
Deferred income taxes	307,893	276,043
Advances for construction	201,413	155,397
Contributions in aid of construction	342,697	340,738
Postretirement benefit plans	45,878	45,063
Regulatory liabilities, less current portion	546,797	483,719
Other noncurrent liabilities	23,920	22,298
Commitments and contingencies
Total capitalization and liabilities	$ 5,149,566	$ 4,658,309