Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
ASSETS
Cash and cash equivalents	$ 679,546	$ 199,877
Restricted cash	15,028	5,050
Accounts receivable and unbilled revenues, net	575,176	511,903
Available-for-sale investment securities, at fair value	1,136,439	1,429,667
Held-to-maturity investment securities, at amortized cost	1,201,314	1,251,747
Stock in Federal Home Loan Bank, at cost	14,728	26,560
Loans held for investment, net	6,106,438	5,906,690
Loans held for sale, at lower of cost or fair value	15,168	824
Property, plant and equipment, net
Land	106,999	109,381
Plant and equipment	8,695,942	8,427,749
Right-of-use assets - finance lease	342,834	49,370
Construction in progress	322,110	293,048
Property, plant and equipment, gross	9,467,885	8,879,548
Less – accumulated depreciation	(3,317,759)	(3,192,545)
Total property, plant and equipment, net	6,150,126	5,687,003
Operating lease right-of-use-assets	94,905	115,684
Regulatory assets	294,804	242,513
Other	877,959	824,536
Goodwill	82,190	82,190
Total assets	17,243,821	16,284,244
Liabilities
Accounts payable	247,462	251,460
Interest and dividends payable	51,206	21,333
Deposit liabilities	8,145,778	8,169,696
Short-term borrowings—other than bank	0	172,568
Other bank borrowings	750,000	695,120
Long-term debt, net—other than bank	2,842,429	2,384,980
Deferred income taxes	297,954	262,462
Operating lease liabilities	103,900	126,604
Finance lease liabilities	339,040	48,709
Regulatory liabilities	1,150,690	1,055,650
Defined benefit pension and other postretirement benefit plans liability	82,879	71,813
Other	853,349	787,057
Total liabilities	14,864,687	14,047,452
Preferred stock of subsidiaries - not subject to mandatory redemption	34,293	34,293
Commitments and contingencies (Notes 3 and 4)
Shareholders’ equity
Preferred stock, no par value, authorized 10,000,000 shares; issued: none	0	0
Common stock, no par value, authorized 200,000,000 shares; issued and outstanding: 110,151,798 shares and 109,470,795 shares at December 31, 2023 and 2022, respectively	1,707,471	1,692,697
Retained earnings	926,720	845,830
Accumulated other comprehensive income (loss), net of taxes
Net unrealized losses on securities	(282,963)	(328,904)
Unrealized gains on derivatives	1,638	1,991
Retirement benefit plans	(8,025)	(9,115)
Accumulated other comprehensive income (loss), net of taxes	(289,350)	(336,028)
Total shareholders’ equity	2,344,841	2,202,499
Total capitalization and liabilities	$ 17,243,821	$ 16,284,244