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Energy system optimization models are important tools to provide insightsregarding trade-offs and interrelations in cost-efficient transformationpathways towards a climate neutral energy system. Using an optimization modelof the European electricity system, we study the influence of either anemission cap or temporally resolved minimum renewable generation shares asmeans to power system decarbonization. Such minimum shares serve as a stylizedrepresentation of novel, more granular procurement or certification schemes forrenewable power generation. We observe that decarbonization through minimumshares results in a significant increase in system costs compared to the leastcost solution obtained through a direct implementation of the correspondingemission reduction as a cap. Nevertheless, these shares provide directincentives for expanding renewable generation and storage technologies, thusacting as an additional, potentially more robust decarbonization mechanism.

Right here, right now? The role of spatio-temporal minimum renewable shares for energy system transformation pathways