This session covers NREL’s work evaluating residential PV adoption timelines and permitting/interconnection processes. The work utilizes project-level data covering 10-25% of U.S. installs each year 2017-2021, along with surveys of jurisdictions and installers. Questions of interest include: which challenges impact adoption timelines, how have timelines changed over the last 5 years (especially during COVID-19), and which processes offer “best practices” for widescale improvements. Initial results from NREL’s collaborative development of the SolarAPP+ automated permitting platform will also be presented.