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EnergyInnovation / eps-us

Energy Policy Simulator - United States
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Subscript vehicle subsidies by vehicle technology #246

Closed mkmahajan closed 1 year ago

mkmahajan commented 2 years ago

Currently, trans/BESP and the Vensim structure only allow subsidy settings for battery electric vehicles. However, current federal subsidies also apply to plug-in hybrids. In the future, we may also want to explore subsidies for hydrogen vehicles. Therefore, we should probably go ahead and subscript subsidies by vehicle technology.

mkmahajan commented 1 year ago

Because we don't want to subscript any policy lever by more than two subscripts, we now have two vehicle subsidy policies: Additional Passenger Vehicle Subsidy and Additional Freight Vehicle Subsidy. Each of these are subscripted by Vehicle Type and Vehicle Technology.

I also moved the subsidy to working in terms of dollars instead of a percentage of the vehicle price. We had found it difficult to implement the IRA vehicle tax credits exactly because they have an exact dollar amount, and the vehicle price changes based on the amount of endogenous learning. We've also had users wanting to implement a specific subsidy amount on the web app but unsure how to translate that to the correct percentage of vehicle price. I did cap the new dollar subsidy amount at the vehicle price so that we can never have negative prices.