Item 7A. Quantitative and Qualitative Disclosures About Market Risk
ITEM 7A. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK
Market risk is the potential loss arising from adverse changes in market rates and prices. We are primarily exposed to commodity price and interest rate risk.
Commodity Price Risk
Our Electric segment business is exposed to market risk arising from changes in commodity prices for wholesale energy and natural gas. OTP purchases energy in the wholesale market to supplement its own electricity generation and to respond to changes in demand and variability in generating plant output. In addition, OTP procures natural gas as a fuel source for its combustion turbine peaking facilities. OTP's exposure to price risk for these commodities is largely mitigated by the current ratemaking process and regulatory framework, which generally allows recovery of purchased power and fuel costs from our electric customers.
OTP, where prudent, seeks to further manage its exposure to commodity price variability and reduce volatility in prices for its retail customers through the use of derivative instruments, primarily financial swap agreements. OTP does not engage in derivative and hedging activities for trading purposes. As of December 31, 2024, OTP was party to financial swap agreements with an aggregate notional amount of 167,200 megawatt-hours of electricity with various settlement dates throughout 2025. As of December 31, 2024, the aggregate fair value of these instruments was $2.0 million, reflected as a liability on our consolidated balance sheets. Holding other variables constant, a ten percent change in energy prices would have had an approximate $0.9 million impact on the fair value of these instruments.
Our Manufacturing and Plastics segment businesses are exposed to market risk arising from changes in commodity prices for certain raw material inputs, including steel, aluminum and PVC and other plastic resins. We manage commodity price risk by attempting to pass changes in the cost of these input materials through to our customers. If our efforts to manage commodity price risk are unsuccessful, the operating revenues and earnings of our Manufacturing and Plastics segment could be impacted.
We do not engage in any hedging activities within our Manufacturing and Plastics segments to manage our commodity price risk.
Interest Rate Risk
Our exposure to interest rate risk arises from our outstanding short-term debt which is subject to variable rates of interest based on benchmark interest rates, primarily SOFR, and our cash equivalent investments, which earn income at a rate that fluctuates daily, based on changes in U.S. treasury rates. As of December 31, 2024 and 2023, we had $69.6 million and $81.4 million of short-term debt outstanding. Holding other variables constant, a 100 basis point change in interest rates during 2024 would have had an approximate $0.4 million impact to interest expense in 2024 based on our average outstanding short-term debt during the year. As of December 31, 2024 and 2023, we had $282.0 million and $219.7 million invested in cash equivalent investments. Holding other variables constant, a 100 basis point change in the average interest rates during 2024 would have had an approximate $2.3 million impact to our investment income in 2024, based on our average outstanding investment balance during the year.
All of our outstanding long-term debt obligations as of December 31, 2024 and 2023 had fixed interest rates and were not subject to material interest rate risk. We manage our interest rate risk through the issuance of fixed-rate debt with varying maturities, by limiting the amount of variable interest rate debt and the utilization of short-term borrowings to allow flexibility in the timing and placement of long-term debt.
We have not used hedging instruments to manage interest risk arising from our portfolio of borrowings. We maintain a ratio of fixed-rate debt to total debt within a certain range. It is our policy to enter into interest rate transactions and other financial
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instruments only to the extent considered necessary to meet our stated objectives. We do not enter into interest rate transactions for speculative or trading purposes.
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