The Disparate Influence of State Renewable Portfolio Standards on Renewable Electricity Generation Capacity
使用合成控制法对美国早期采用可再生能源组合标准的各州进行个案研究，发现政策效果因州而异，仅德克萨斯州的政策显著提升了可再生能源装机容量。
Several papers have used panel data analyses to examine the effectiveness of U.S. state-level renewable portfolio standards (RPS) in promoting renewable capacity development, but the findings are inconclusive. Estimation of average treatment effects, however, can mask the fact that RPS policies across states are disparate and the treatment states are heterogeneous. We use the synthetic control method to conduct individual case studies of the early adopter states. Our findings indicate that the impact of RPS policies varied across states. We find Texas to be unique among these early adopters in that the RPS policy in Texas has led to increased renewable capacity. <i></i>