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Summary of Significant Accounting Policies [Table Text Block]

12 Months Ended

Sep. 30, 2023

Accounting Policies [Abstract]

Property, Plant, and Equipment Depreciation Rates

Average depreciation rates by asset class are as follows:

Property, Plant, and Equipment Depreciation Rates At September 30 (percent)
			2023						2022						2021
Asset Class
Nuclear			2.73						2.72						2.38
Coal-fired(1)			4.98						4.27						1.95
Hydroelectric			1.82						1.85						1.60
Gas and oil-fired			3.17						3.38						2.98
Transmission			1.52						1.51						1.34
Other			4.43						3.64						7.12

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Tabular disclosure of average depreciation rates by asset class.

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