BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Property, plant and equipment
Property, plant and equipment	$ 9,587,605	$ 9,124,134
Accumulated depreciation and amortization	2,577,880	2,478,261
Net property, plant and equipment	7,009,725	6,645,873
Current assets
Cash and cash equivalents	9,047	57,995
Restricted cash and cash equivalents	11,738	20,542
Cash, cash equivalents, restricted cash and restricted cash equivalents	20,785	78,537
Accounts receivable, net	210,173	408,448
Materials and supplies	97,453	91,662
Income taxes receivable	53,624	53,624
Natural gas in storage	198,045	161,184
Regulatory assets, current	70,619	101,210
Other current assets	28,508	35,216
Total current assets	679,207	929,881
Goodwill and other assets
Regulatory assets, noncurrent	260,583	278,006
Other intangible assets, net	241,475	265,951
Goodwill	157,953	157,953
Defined benefit plan, amounts for asset (liability) recognized in statement of financial position	52,277	42,882
Other assets	103,054	105,025
Total goodwill and other assets	815,342	849,817
Total assets	8,504,274	8,425,571
Equity and long-term debt
Common stock, $0.01 par value: authorized 250,000,000 shares; issued and outstanding 59,999,041 shares at September 30, 2025; issued and outstanding 59,876,861 shares at December 31, 2024	600	599
Paid-in capital	2,317,921	2,294,469
Retained earnings	863,777	809,606
Accumulated other comprehensive loss	78	(126)
Total equity	3,182,376	3,104,548
Other long-term debt, noncurrent	2,132,689	2,131,718
Securitized utility tariff bonds, excluding current maturities, net of issuance costs	222,879	253,568
Long-Term debt, excluding current maturities, total	2,355,568	2,385,286
Total equity and long-term debt	5,537,944	5,489,834
Current liabilities
Long-term debt, current maturities	249,646	14
Current maturities of securitized utility tariff bonds	30,566	28,956
Short-term debt	764,400	914,600
Accounts payable	121,070	261,321
Accrued taxes other than income	73,688	75,608
Regulatory liability, current	61,208	22,525
Customer deposits	56,662	56,243
Other current liabilities	96,694	99,009
Total current liabilities	1,453,934	1,458,276
Deferred credits and other liabilities
Deferred income taxes	937,841	891,738
Regulatory liability, noncurrent	461,739	467,563
Other deferred credits	112,816	118,160
Total deferred credits and other liabilities	1,512,396	1,477,461
Commitments and contingencies
Total liabilities and equity	$ 8,504,274	$ 8,425,571