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Derivative Instruments	3 Months Ended
Derivative Instruments	Mar. 31, 2024
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Instruments	Derivative Instruments OTP enters into derivative instruments to manage its exposure to future market energy price variability and reduce volatility in prices for our retail customers. These derivative instruments are not designated as qualifying hedging transactions but provide for an economic hedge against future market energy price variability. The instruments are recorded at fair value on the consolidated balance sheets. In accordance with rate-making and cost recovery processes, we recognize a regulatory asset or liability to defer losses or gains from derivative activity until settlement of the associated derivative instrument. As of March 31, 2024, OTP had multiple outstanding pay-fixed, receive-variable swap agreements with an aggregate notional amount of 54,000 megawatt-hours of electricity, with settlement dates extending to December 31, 2024. As of March 31, 2024, the fair value of these derivative instruments was $0.2 million, which is included in other current liabilities on the consolidated balance sheets. As of December 31, 2023, the fair value of these derivative instruments was $4.2 million, which is included in other current liabilities. During the three months ended March 31, 2024 and 2023, contracts matured and were settled in an aggregate amount of a $2.7 million loss and a $16.0 million loss, respectively. Gains and losses recognized on the settlement of derivative instruments are returned to, or recovered from, our electric customers through fuel recovery mechanisms in each state. When recognized in the consolidated statements of income, these gains or losses are included in electric purchased power.