,Unit,Values,Description year,--,"YYYY; e.g. '2030'","Year for which to retrieve cost assumptions of ``data/costs.csv``." discountrate,--,float,"Default discount rate if not specified for a technology in ``data/costs.csv``." USD2013_to_EUR2013,--,float,"Exchange rate from USD :math:`_{2013}` to EUR :math:`_{2013}` from `ECB `_" capital_cost,EUR/MW,"Keys should be in the 'technology' column of ``data/costs.csv``. Values can be any float.","For the given technologies, assumptions about their capital investment costs are set to the corresponding value. Optional; overwrites cost assumptions from ``data/costs.csv``." marginal_cost,EUR/MWh,"Keys should be in the 'technology' column of ``data/costs.csv``. Values can be any float.","For the given technologies, assumptions about their marginal operating costs are set to the corresponding value. Optional; overwrites cost assumptions from ``data/costs.csv``." emission_prices,--,E,TODO