CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Utility Plant
Plant in Service	$ 7,918,549	$ 7,813,680
Construction Work in Progress	333,477	256,044
Total Utility Plant	8,252,026	8,069,724
Accumulated Depreciation and Amortization	(2,653,194)	(2,603,730)
Total Utility Plant, Net	5,598,832	5,465,994
Investments and Other Property	65,402	74,128
Current Assets
Cash and Cash Equivalents	52,835	16,237
Accounts Receivable (Net of Allowance for Credit Losses of $8,760 and $9,012)	205,479	320,899
Fuel Inventory	37,827	28,681
Materials and Supplies	164,652	155,650
Regulatory Assets	163,327	185,034
Derivative Instruments	26,539	27,019
Other	30,019	30,547
Total Current Assets	680,678	764,067
Regulatory and Other Assets
Regulatory Assets	177,814	184,894
Derivative Instruments	38,330	77,123
Other	134,234	123,575
Total Regulatory and Other Assets	350,378	385,592
Total Assets	6,695,290	6,689,781
Common Stock Equity:
Common Stock (No Par Value, 75,000,000 Shares Authorized, 32,139,434 Shares Outstanding as of June 30, 2023 and December 31, 2022)	1,702,439	1,696,539
Capital Stock Expense	(6,357)	(6,357)
Retained Earnings	1,007,986	968,367
Accumulated Other Comprehensive Loss	(2,829)	(2,884)
Total Common Stock Equity	2,701,239	2,655,665
Preferred Stock (No Par Value, 1,000,000 Shares Authorized, None Outstanding as of June 30, 2023 and December 31, 2022)	0	0
Long-Term Debt, Net	2,395,534	2,114,980
Total Capitalization	5,096,773	4,770,645
Current Liabilities
Current Maturities of Long-Term Debt, Net	0	149,957
Accounts Payable	133,726	233,920
Accrued Taxes Other Than Income Taxes	54,657	58,914
Accrued Employee Expenses	30,037	38,459
Accrued Interest	19,710	14,868
Regulatory Liabilities	98,465	110,782
Customer Deposits	14,841	14,073
Derivative Instruments	11,078	12,752
Other	46,516	49,163
Total Current Liabilities	409,030	682,888
Regulatory and Other Liabilities
Deferred Income Taxes, Net	607,473	590,926
Regulatory Liabilities	320,251	377,546
Pension and Other Postretirement Benefits	69,667	69,048
Derivative Instruments	3,060	4,787
Other	189,036	193,941
Total Regulatory and Other Liabilities	1,189,487	1,236,248
Commitments and Contingencies
Total Capitalization and Other Liabilities	$ 6,695,290	$ 6,689,781