CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Utility plant:
Land	$ 44,681	$ 44,657
Depreciable plant and equipment	4,395,856	4,249,314
Construction work in progress	241,793	179,486
Intangible assets	51,604	51,604
Total utility plant	4,733,934	4,525,061
Less: accumulated depreciation and amortization	1,079,538	1,036,450
Net utility plant	3,654,396	3,488,611
Nonutility properties	1,314	1,314
Less: accumulated depreciation	99	98
Net nonutility properties	1,215	1,216
Current assets:
Cash and cash equivalents	19,849	11,114
Accounts receivable:
Customers, net of allowances for credit losses of $994 and $1,172 on June 30, 2025 and December 31, 2024, respectively	76,758	68,679
Income tax	0	5,953
Other	7,666	7,059
Accrued unbilled revenue	67,960	60,847
Prepaid expenses	8,427	10,297
Current regulatory assets	12,626	18,172
Other current assets	7,164	8,593
Total current assets	200,450	190,714
Other assets:
Regulatory assets, less current portion	232,650	224,055
Investments	18,878	18,087
Postretirement benefit plans	68,682	66,422
Goodwill	640,311	640,311
Other	30,344	28,893
Total other assets	990,865	977,768
Total assets	4,846,926	4,658,309
Stockholders’ equity:
Common stock, $0.001 par value; authorized 70,000,000 shares; issued and outstanding shares 35,287,080 on June 30, 2025 and 33,629,169 on December 31, 2024	35	34
Additional paid-in capital	914,330	827,796
Retained earnings	549,646	537,184
Accumulated other comprehensive income	1,960	1,960
Total stockholders’ equity	1,465,971	1,366,974
Long-term debt, less current portion	1,692,212	1,706,904
Total capitalization	3,158,183	3,073,878
Current liabilities:
Lines of credit	160,840	119,124
Current portion of long-term debt	18,923	3,648
Accrued groundwater extraction charges, purchased water and power	38,310	25,118
Accounts payable	48,231	56,256
Accrued interest	16,126	17,476
Accrued payroll	11,579	15,193
Current regulatory liabilities	2	1,122
Other current liabilities	20,223	23,236
Total current liabilities	314,234	261,173
Deferred income taxes	286,031	276,043
Advances for construction	172,612	155,397
Contributions in aid of construction	339,949	340,738
Postretirement benefit plans	44,033	45,063
Regulatory liabilities, less current portion	508,980	483,719
Other noncurrent liabilities	22,904	22,298
Commitments and contingencies
Total capitalization and liabilities	$ 4,846,926	$ 4,658,309