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Revenue (Tables)

6 Months Ended

Mar. 31, 2025

Revenue from Contract with Customer [Abstract]

Disaggregation of Revenue [Table Text Block]

TVA's operating revenues by state for the three and six months ended March 31, 2025 and 2024, are detailed in the table below:

Operating Revenues By State (in millions)
			Three Months Ended March 31												Six Months Ended March 31
			2025						2024						2025						2024
Alabama			$	520					$	457					$	951					$	865
Georgia			94						80						168						149
Kentucky			214						201						396						378
Mississippi			307						284						576						539
North Carolina			28						28						49						51
Tennessee			2,298						2,027						4,184						3,816
Virginia			16						14						28						25
Subtotal			3,477						3,091						6,352						5,823
Off-system sales			1						2						2						4
Revenue capitalized during pre-commercial plant operations(1)			(2)						—						(2)						(3)
Revenue from sales of electricity			3,476						3,093						6,352						5,824
Other revenue			56						61						100						95
Total operating revenues			$	3,532					$	3,154					$	6,452					$	5,919

Note

(1) Represents revenue capitalized during pre-commercial operations at Johnsonville Aeroderivative CT Units 21-30 in the six months ended March 31, 2025 and Paradise CT Units 5-7 in the six months ended March 31, 2024, all of which was recognized in the three months ended December 31, 2023.

Revenue from External Customers by Products and Services [Table Text Block]

TVA's operating revenues by customer type for the three and six months ended March 31, 2025 and 2024, are detailed in the table below:

Operating Revenues by Customer Type (in millions)
			Three Months Ended March 31												Six Months Ended March 31
			2025						2024						2025						2024
Revenue from sales of electricity
Local power companies			$	3,199					$	2,842					$	5,815					$	5,329
Industries directly served			245						221						475						438
Federal agencies and other			34						30						64						60
Revenue capitalized during pre-commercial plant operations(1)			(2)						—						(2)						(3)
Revenue from sales of electricity			3,476						3,093						6,352						5,824
Other revenue			56						61						100						95
Total operating revenues			$	3,532					$	3,154					$	6,452					$	5,919

Note

(1) Represents revenue capitalized during pre-commercial operations at Johnsonville Aeroderivative CT Units 21-30 in the six months ended March 31, 2025 and Paradise CT Units 5-7 in the six months ended March 31, 2024, all of which was recognized in the three months ended December 31, 2023.

Schedule of Long-term Contracts for Purchase of Electric Power

TVA Local Power Company Contracts At or for the Six Months Ended March 31, 2025
Contract Arrangements(1)						Number of LPCs						Revenue from Sales of Electricity to LPCs (in millions)						Percentage of Total Operating Revenues
20-year termination notice						148						$	5,071					78.6		%
5-year termination notice						5						744						11.5		%
Total						153						$	5,815					90.1		%

Note

(1) Ordinarily, the LPCs and TVA have the same termination notice period; however, in a contract with one of the LPCs with a five-year termination notice, TVA has a 10-year termination notice (which becomes a five-year termination notice if TVA loses its discretionary wholesale rate-setting authority). Certain LPCs have five-year termination notices or a shorter period if any act of Congress, court decision, or regulatory change requires or permits that election.

X

- Definition

Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-5

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- Definition

Tabular disclosure of entity-wide revenues from external customers for each product or service or each group of similar products or services if the information is not provided as part of the reportable operating segment information.

+ References

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-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
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-Publisher FASB
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- Definition

Tabular disclosure of information concerning the terms and significance of long term contracts to purchase power (generally referred to as purchase power agreements (PPAs) or power sale agreements (PSAs)) including date of contract expiration, share of plant output being purchased, estimated annual cost, annual minimum debt service payment required and amount of related long-term debt or lease obligations outstanding.

+ References

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-Topic 980
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 10.D)
-Publisher FASB
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