Sales of plug-in electric vehicles (PEVs), which include battery electric vehicles (BEVs) and plug-in hybrid electric vehicles (PHEVs), have grown substantially in recent years. To encourage PEV adoption, policymakers have offered monetary incentives for new PEV purchases, invested in charging infrastructure, and provided use-based incentives like High-Occupancy Vehicle (HOV) lane access and parking benefits. But questions remain regarding where, for how long, and how much promotion and government support might be necessary to achieve the state’s targets. Existing research on technology diffusion indicates that exposure through neighbors, workplace peers, and other acquaintances can legitimize new technology for the mass market and accelerate its market penetration. Researchers from the University of California, Davis and Irvine examined the adoption of PEVs in California between 2014 and 2016, both spatially and temporally, to gain a better understanding of the technology diffusion process and the effect of technology exposure, while controlling for sociodemographic factors and the effect of PEV incentive programs on PEV adoption in the state. This policy brief summarizes the findings from that research and provides policy implications.
