To fight climate change, the European Union has developed a new growth strategy to transform Europe into the first climate-neutral continent by 2050. However, EU climate change mitigation policies can be designed in different ways and have implications for the nature and intensity of European solidarity. Drawing on data from an original conjoint experiment fielded in Germany (N=5,796), this article investigates how policy design shapes public support for EU climate change mitigation. To this end, the study theoretically and empirically distinguishes four policy dimensions in public support: sectoral scope, social spending, financing structure and allocation principle. The results show that policy packages that target the renewable energy sector, include social investment policies, are financed by increasing taxes on the rich and allocate resources between EU member states based on population size are most supported. These findings shed light on the political viability of alternative EU climate change mitigation policy packages.