SolarAPP+ Performance Review: 2021 Data

Jeffrey Cook, Eric O'Shaughnessy, Kaifeng Xu, Sushmita Jena, Minahil Sana Qasim, Seth Crew

Research output: NRELTechnical Report


Accelerating rooftop solar photovoltaic (PV) deployment has strained the capacity of local authorities responsible for permitting, inspection, and interconnection (PII). Given the ongoing expansion of rooftop PV, a growing number of authorities having jurisdiction (AHJs) and utilities are reforming PII processes to reduce delays. AHJs could significantly reduce PII timelines through reforms such as expedited reviews for small-scale systems, online customer portals, and over-the-counter permitting. However, independent reforms do not resolve issues associated with PII variability across AHJs, and many AHJs lack the resources to implement reforms.In response to these challenges, the National Renewable Energy Laboratory (NREL) developed the Solar Automated Permit Processing Plus (SolarAPP+) platform, in collaboration with local governments, code development organizations, and industry stakeholders. This report shows SolarAPP+ performance in 2021 across AHJs.
Original languageAmerican English
Number of pages35
StatePublished - 2022

NREL Publication Number

  • NREL/TP-6A20-83046


  • AHJ
  • authorities having jurisdiction
  • deployment
  • inspection
  • permitting
  • PII
  • rooftop solar photovoltaics
  • Solar Automated Permit Processing Plus
  • SolarAPP+
  • utilities


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