Energy Transition in Oil-Dependent Economies: Public Discount Rates for Investment Project Evaluation
研究了石油出口国在能源转型中如何确定公共贴现率，发现无风险贴现率为3.1%，但石油相关现金流需加1.4%风险溢价，最终实际贴现率为4.5%，并评估了各国减少石油消费的现值。
Selecting welfare-enhancing projects necessitates determining the present value of cash flows from a public policy perspective. For an oil-exporting economy, the domestic energy transition often implies displacing oil from domestic consumption. Economic dependence on oil affects the public discount rate for oil price-related cash flows in two opposite ways: On the one hand, it renders the economy more volatile, which lowers the risk-free discount rate; on the other hand, it increases the correlation between consumption and the oil price, which results in a higher risk premium. To study these opposite forces, we first derive the public discount rate for an oil price-related investment project. Our framework considers economic uncertainty, an oil price-related risk premium, and allows for valuing oil at its opportunity cost. We illustrate our methodology using data from a panel of 26 oil-exporting countries. The results indicate that a risk-free discount rate of 3.1% is appropriate for our panel. However, to discount oil price-related cash flows, a risk premium of 1.4% needs to be added to the risk-free rate, which yields a risk-adjusted real discount rate of 4.5%. We find significant disparities between country-specific public discount rates. Additionally, for each country, we assess the present value of reducing domestic oil consumption by a barrel per day from 2023 to 2040, breaking down the different effects. Oil-exporting countries can use our estimates for making investment or policy decisions.