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Revenue Local Power Company Contracts (Tables)
 6 Months Ended
Mar. 31, 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 six months ended March 31, 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 March 31, 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 $1,934 75.2 %
 5-year termination notice11 403 15.7 %
Total153 $2,337 90.9 %
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 Six Months Ended March 31, 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 $3,654 74.9 %
 5-year termination notice11 774 15.9 %
Total153 $4,428 90.8 %
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.