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Risk Management Activities and Derivative Transactions (Tables)
 9 Months Ended
Jun. 30, 2024
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Summary of Derivative Instruments That Receive Hedge Accounting Treatment
The following tables summarize the accounting treatment that certain of TVA's financial derivative transactions receive:

Summary of Derivative Instruments That Receive Hedge Accounting Treatment (part 1) 
Amount of Mark-to-Market Gain (Loss) Recognized in Accumulated Other Comprehensive Income (Loss)
(in millions)
Three Months Ended June 30Nine Months Ended June 30
Derivatives in Cash Flow Hedging RelationshipObjective of Hedge TransactionAccounting for Derivative
Hedging Instrument		2024202320242023
Currency swapsTo protect against changes in cash flows caused by changes in foreign currency exchange rates (exchange rate risk)Unrealized gains and losses are recorded in AOCI and reclassified to Interest expense to the extent they are offset by gains and losses on the hedged transaction$1 $5 $17 $79 

Summary of Derivative Instruments That Receive Hedge Accounting Treatment (part 2)(1)
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) to Interest Expense
(in millions)
Three Months Ended June 30Nine Months Ended June 30
Derivatives in Cash Flow Hedging Relationship2024202320242023
Currency swaps$7 $22 $20 $65 
Note
(1) There were no amounts excluded from effectiveness testing for any of the periods presented. Based on forecasted foreign currency exchange rates, TVA expects to reclassify approximately $10 million of gains from Accumulated other comprehensive income (loss) ("AOCI") to Interest expense within the next 12 months to offset amounts anticipated to be recorded in Interest expense related to the forecasted exchange loss on the debt.
 [1]
Summary of Derivative Instruments That Do Not Receive Hedge Accounting Treatment
Summary of Derivative Instruments That Do Not Receive Hedge Accounting Treatment
Amount of Gain (Loss) Recognized in Income on Derivatives(1)
(in millions)
Three Months Ended June 30Nine Months Ended June 30
Derivative TypeObjective of DerivativeAccounting for Derivative Instrument2024202320242023
Interest rate swapsTo fix short-term debt variable rate to a fixed rate (interest rate risk)Mark-to-market gains and losses are recorded as regulatory liabilities and assets, respectively

Realized gains and losses are recognized in Interest expense when incurred during the settlement period and are presented in operating cash flow		$(8)$(10)$(23)$(36)
Commodity derivatives
under the FHP		To protect against fluctuations in market prices of purchased commodities (price risk)
Mark-to-market gains and losses are recorded as regulatory liabilities and assets, respectively

Realized gains and losses are recognized in Fuel expense or Purchased power expense as the contracts settle to match the delivery period of the underlying commodity(2)
(72)(97)(227)(256)
Notes
(1) All of TVA's derivative instruments that do not receive hedge accounting treatment have unrealized gains (losses) that would otherwise be recognized in income but instead are deferred as regulatory assets and liabilities. As such, there were no related gains (losses) recognized in income for these unrealized gains (losses) for the three and nine months ended June 30, 2024 and for the three and nine months ended June 30, 2023.
(2) Of the amount recognized for the three months ended June 30, 2024, $59 million and $13 million were reported in Fuel expense and Purchased power expense, respectively, and of the amount recognized for the three months ended June 30, 2023, $78 million and $19 million were reported in Fuel expense and Purchased power expense, respectively. Of the amount recognized for the nine months ended June 30, 2024, $186 million and $41 million were reported in Fuel expense and Purchased power expense, respectively, and of the amount recognized for the nine months ended June 30, 2023, $205 million and $51 million were reported in Fuel expense and Purchased power expense, respectively.
Fair Value of TVA Derivatives
Fair Values of TVA Derivatives
(in millions)
 At June 30, 2024At September 30, 2023
Derivatives That Receive Hedge Accounting Treatment:
BalanceBalance Sheet PresentationBalanceBalance Sheet Presentation
Currency swaps    
£250 million Sterling
$(58)
Accounts payable and accrued liabilities $(5); Other long-term liabilities $(53)
$(72)
Accounts payable and accrued liabilities $(6); Other long-term liabilities $(66)
£150 million Sterling
(66)
Accounts payable and accrued liabilities $(3); Other long-term liabilities $(63)
(69)
Accounts payable and
accrued liabilities $(4); Other long-term liabilities $(65)
Derivatives That Do Not Receive Hedge Accounting Treatment:
BalanceBalance Sheet PresentationBalanceBalance Sheet Presentation
Interest rate swaps    
$1.0 billion notional$(520)
Accounts payable and
accrued liabilities $(22); Accrued interest $(5);
Other long-term liabilities
$(493)
$(499)
Other current assets $1; Accrued interest $(27); Other long-term liabilities $(473)
$476 million notional(172)
Accounts payable and
accrued liabilities $(6); Accrued interest $(1);
Other long-term liabilities
$(165)
(159)
Other current assets $3; Accrued interest $(8);
Other long-term liabilities
$(154)
Commodity contract derivatives14 
Other current assets $9; Other long-term assets $9; Accounts payable and accrued liabilities $(2); Other long-term liabilities $(2)
31 
Other current assets $21; Other long-term assets $12; Accounts payable and accrued liabilities $(1); Other long-term liabilities $(1)
Commodity derivatives under the FHP(177)
Accounts payable and accrued liabilities $(120); Other long-term liabilities $(57)
(186)
Accounts payable and accrued liabilities $(135); Other long-term liabilities $(51)
Commodity Contract Derivatives
Commodity Contract Derivatives 
 At June 30, 2024At September 30, 2023
 
Number of Contracts
Notional Amount
Fair Value (MtM)
(in millions)
Number of ContractsNotional Amount
Fair Value (MtM)
(in millions)
Natural gas contract derivatives52353 million mmBtu$14 54318 million mmBtu$31 
Offsetting Assets and Liabilities
The amounts of TVA's derivative instruments as reported on the Consolidated Balance Sheets are shown in the table below:
Derivative Assets and Liabilities(1)
(in millions)
 At June 30, 2024At September 30, 2023
Assets
Commodity contract derivatives$18 $33 
Interest rate swaps— 4 
Total derivatives subject to master netting or similar arrangement$18 $37 
Liabilities
Currency swaps$124 $141 
Interest rate swaps(2)
692 662 
Commodity contract derivatives 4 2 
Commodity derivatives under the FHP(3)
177 186 
Total derivatives subject to master netting or similar arrangement$997 $991 
Notes
(1) Offsetting amounts include counterparty netting of derivative contracts. Except as discussed below, there were no other material offsetting amounts on TVA's Consolidated Balance Sheets at either June 30, 2024, or September 30, 2023.
(2) Letters of credit of $415 million and $509 million were posted as collateral at June 30, 2024, and September 30, 2023, respectively, to partially secure the liability positions of one of the interest rate swaps in accordance with the collateral requirements for this derivative.
(3) At June 30, 2024, the gross derivative asset and gross derivative liability were $8 million and $185 million, respectively, with offsetting amounts for each totaling
$8 million. At September 30, 2023, the gross derivative asset and gross derivative liability were $26 million and $212 million, respectively, with offsetting amounts for each totaling $26 million.
Schedule of Derivative Instruments Commodity Contracts Under FHP
Commodity Derivatives under Financial Hedging Program(1)
At June 30, 2024At September 30, 2023
Number of Contracts
Notional Amount
Fair Value (MtM)
(in millions)
Number of Contracts
Notional Amount
Fair Value (MtM)
(in millions)
Natural gas swap contracts153263 million mmBtu$(177)221388 million mmBtu$(186)
Note
(1) Fair value amounts presented are based on the net commodity position with the counterparty. Notional amounts disclosed represent the net value of contractual amounts.
[1] There were no amounts excluded from effectiveness testing for any of the periods presented. Based on forecasted foreign currency exchange rates, TVA expects to reclassify approximately $10 million of gains from Accumulated other comprehensive income (loss) ("AOCI") to Interest expense within the next 12 months to offset amounts anticipated to be recorded in Interest expense related to the forecasted exchange loss on the debt.