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Working Paper
Time-Limited Subsidies: Optimal Taxation with Implications for Renewable Energy Subsidies
Pigouvian subsidies are efficient, but output subsidies with uncertain or limited durations are not Pigouvian. We show that optimal “time-limited” policies must also subsidize investment to correct externalities generated after the output subsidy ends. Furthermore, an output subsidy’s optimal duration is characterized by the change in production when it ends. In the wind-energy industry, we find that power generation decreases by 5-10% after the end of facilities’ ten-year eligibility for the Renewable Energy Production Tax Credit. This behavioral response has implications for energy ...