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Revenue Local Power Company Contracts (Tables)
 9 Months Ended
Jun. 30, 2021
Long-term Contract for Purchase of Electric Power [Line Items]  
Long-term Contracts or Programs Disclosure [Text Block] The number of LPCs by contract arrangement, the revenues derived from such arrangements for the three and nine months ended June 30, 2021, and the percentage those revenues comprised of TVA's total operating revenues for the same periods, are summarized in the tables below:
TVA Local Power Company Contracts
At or for the Three Months Ended June 30, 2021
Contract Arrangements(1)
Number of LPCs
Revenue from Sales of Electricity to LPCs
(in millions)
Percentage of Total Operating Revenues
20-year termination notice142 $1,851 73.2 %
 5-year termination notice11 432 17.1 %
Total153 $2,283 90.3 %
Note
(1) Ordinarily, the LPCs and TVA have the same termination notice period; however, in contracts with two of the LPCs with five-year termination notices, 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.

TVA Local Power Company Contracts
At or for the Nine Months Ended June 30, 2021
Contract Arrangements(1)
Number of LPCs
Revenue from Sales of Electricity to LPCs
(in millions)
Percentage of Total Operating Revenues
20-year termination notice142 $5,505 74.4 %
 5-year termination notice11 1,206 16.3 %
Total153 $6,711 90.7 %
Note
(1) Ordinarily, the LPCs and TVA have the same termination notice period; however, in contracts with two of the LPCs with five-year termination notices, 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.