CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2021	Sep. 30, 2020
ASSETS
Property, plant and equipment	$ 17,265,383	$ 15,957,221
Less accumulated depreciation and amortization	2,787,634	2,601,874
Net property, plant and equipment	14,477,749	13,355,347
Current assets
Cash and cash equivalents	524,621	20,808
Accounts receivable, net (See Note 5)	291,122	230,595
Gas stored underground	99,469	111,950
Other current assets	200,154	107,905
Total current assets	1,115,366	471,258
Goodwill	731,257	731,257
Deferred charges and other assets (See Note 8)	2,991,063	801,170
Total assets	19,315,435	15,359,032
Shareholders’ equity
Common stock, no par value (stated at $0.005 per share); 200,000,000 shares authorized; issued and outstanding: June 30, 2021 — 130,787,039 shares; September 30, 2020 — 125,882,477 shares	654	629
Additional paid-in capital	4,865,268	4,377,149
Accumulated other comprehensive income (loss)	61,239	(57,589)
Retained earnings	2,846,597	2,471,014
Shareholders’ equity	7,773,758	6,791,203
Long-term debt	7,128,505	4,531,779
Total capitalization	14,902,263	11,322,982
Current liabilities
Accounts payable and accrued liabilities	280,352	235,775
Other current liabilities	581,722	546,461
Current maturities of long-term debt	200,442	165
Total current liabilities	1,062,516	782,401
Deferred income taxes	1,667,784	1,456,569
Regulatory excess deferred taxes	587,680	697,764
Regulatory cost of removal obligation	464,536	457,188
Deferred credits and other liabilities	630,656	642,128
Total capitalization and liabilities	$ 19,315,435	$ 15,359,032