These past decades we are witnessing the uptake of renewable energy deployment globally. Global warming and energy security concerns necessitate the transition to renewable energy. As such, policy makers try to promote the diffusion of renewable energy generation. Although there is a rising concern among economists as to which are the determinants of renewable energy development, little evidence is provided on the existence of spatial dependence among these factors. In the US, green energy is promoted mainly through the state governments. In this study, spatial panel models are used to control for spatial dependence, focusing on 48 US states for the period 1990 to 2017. Focus of this study is to assess the effectiveness of the adopted policies for the development of renewable generation share. Controlling for Renewable Portfolio Standards, Public Benefit Funds, Net Metering and Mandatory Green Power Options, we find that states which adopt a complete policy portfolio achieve higher renewable energy share in the total energy mix.
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