CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2021	Sep. 30, 2021
ASSETS
Property, plant and equipment	$ 18,573,857	$ 17,885,098
Less accumulated depreciation and amortization	2,847,066	2,821,128
Net property, plant and equipment	15,726,791	15,063,970
Current assets
Cash and cash equivalents	264,005	116,723
Accounts receivable, net (See Note 5)	514,333	342,967
Gas stored underground	220,279	178,116
Other current assets (See Note 8)	2,275,588	2,200,909
Total current assets	3,274,205	2,838,715
Goodwill	731,257	731,257
Deferred charges and other assets (See Note 8)	813,531	974,720
Total assets	20,545,784	19,608,662
Shareholders’ equity
Common stock, no par value (stated at $0.005 per share); 200,000,000 shares authorized; issued and outstanding: December 31, 2021 — 135,425,081 shares; September 30, 2021 — 132,419,754 shares	677	662
Additional paid-in capital	5,293,541	5,023,751
Accumulated other comprehensive income	23,856	69,803
Retained earnings	2,971,471	2,812,673
Shareholders’ equity	8,289,545	7,906,889
Long-term debt	5,555,177	4,930,205
Total capitalization	13,844,722	12,837,094
Current liabilities
Accounts payable and accrued liabilities	398,431	423,222
Other current liabilities	626,684	686,681
Current maturities of long-term debt	2,401,377	2,400,452
Total current liabilities	3,426,492	3,510,355
Deferred income taxes	1,744,648	1,705,809
Regulatory excess deferred taxes	508,731	549,227
Regulatory cost of removal obligation	474,695	468,688
Deferred credits and other liabilities	546,496	537,489
Total capitalization and liabilities	$ 20,545,784	$ 19,608,662