In light of climate change mitigation and the transformation of the energy sector, many jurisdictions have adopted deployment policies for renewable energy (RE) technologies. Several RE deployment policy instruments have diffused from frontrunner countries to other jurisdictions. Switzerland implemented its first comprehensive RE support policy with the adoption of a cost-covering and technology-specific feed-in tariff in 2009, following Germany’s example. Yet, policy designs look very different in the two countries and, importantly, also result in different policy outcomes. In this chapter, we examine the reasons for these policy design differences. We unpack the design of the Swiss feed-in tariff and analyze which of the policy’s elements were directly adopted from Germany and which were accommodated to the Swiss context and why. In particular, we compare the specific instrument designs for two renewable power generation technologies, solar photovoltaics (PV) and biomass, and study the role of technology-related actors in shaping these policy designs. We draw from the policy diffusion and policy transfer literatures and offer important extensions to the literature by showing that, instead of entire policies, it is possible that only certain design elements of a policy diffuse from one jurisdiction to another. Additionally, we find that the composition of the existing technology-related actor bases in the donor and recipient countries is important in determining whether the accommodation of the design elements to the domestic context occurs.