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CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Utility plant:    
Land $ 44,657 $ 44,657
Depreciable plant and equipment 4,526,148 4,249,314
Construction work in progress 277,948 179,486
Intangible assets 51,683 51,604
Total utility plant 4,900,436 4,525,061
Less: accumulated depreciation and amortization 1,102,312 1,036,450
Net utility plant 3,798,124 3,488,611
Nonutility properties 1,314 1,314
Less: accumulated depreciation 101 98
Net nonutility properties 1,213 1,216
Current assets:    
Cash and cash equivalents 11,314 11,114
Accounts receivable:    
Customers, net of allowances for credit losses of $1,050 and $1,172 on September 30, 2025 and December 31, 2024, respectively 86,008 68,679
Income tax 0 5,953
Other 6,490 7,059
Accrued unbilled revenue 73,131 60,847
Prepaid expenses 15,989 10,297
Current regulatory assets 7,047 18,172
Other current assets 7,227 8,593
Total current assets 207,206 190,714
Other assets:    
Regulatory assets, less current portion 242,376 224,055
Investments 19,271 18,087
Postretirement benefit plans 70,092 66,422
Goodwill 640,311 640,311
Other 32,061 28,893
Total other assets 1,004,111 977,768
Total assets 5,010,654 4,658,309
Stockholders’ equity:    
Common stock, $0.001 par value; authorized 70,000,000 shares; issued and outstanding shares 35,805,089 on September 30, 2025 and 33,629,169 on December 31, 2024 36 34
Additional paid-in capital 941,759 827,796
Retained earnings 579,908 537,184
Accumulated other comprehensive income 1,960 1,960
Total stockholders’ equity 1,523,663 1,366,974
Long-term debt, less current portion 1,756,955 1,706,904
Total capitalization 3,280,618 3,073,878
Current liabilities:    
Lines of credit 126,368 119,124
Current portion of long-term debt 18,010 3,648
Accrued groundwater extraction charges, purchased water and power 42,457 25,118
Accounts payable 61,238 56,256
Accrued interest 18,319 17,476
Accrued payroll 13,596 15,193
Current regulatory liabilities 3 1,122
Other current liabilities 24,172 23,236
Total current liabilities 304,163 261,173
Deferred income taxes 302,959 276,043
Advances for construction 183,892 155,397
Contributions in aid of construction 343,295 340,738
Postretirement benefit plans 44,264 45,063
Regulatory liabilities, less current portion 528,206 483,719
Other noncurrent liabilities 23,257 22,298
Commitments and contingencies
Total capitalization and liabilities $ 5,010,654 $ 4,658,309