Solar TRACE: Permitting, Inspection, and Interconnection Data and Analytics

The Solar Time-based Residential Analytics and Cycle time Estimator (Solar TRACE) for rooftop solar permitting, inspection, and interconnection (PII) was developed by the National Renewable Energy laboratory (NREL). The median timelines presented were calculated from data on over 200,000 residential rooftop photovoltaic (PV) projects provided by a range of mid-to-large-scale installers, accounting for 17-29% of U.S. installs for the years shown.

Search below for any authority having jurisdiction (AHJ) of interest, generally a city or county. The AHJs listed are those with a minimum of 10 permitted projects per year based on installer provided data. AHJs not listed lacked sufficient data to determine median project timelines. Median permitting and inspection timeline results are shown for the AHJ and can be toggled between the years listed (2017, 2018, and 2019) and project sizes (1-10 and 11-50kW). Also shown are interconnection timelines for all utilities that serve that AHJ, if sufficient data exists. Timelines between AHJs can also be compared by searching additional AHJs.

Permitting and interconnection requirements that may impact these timelines or install costs are shown at the bottom, along with median project timelines for the state(s) in which the AHJ(s) are located. For more information on this data viewer and to identify errors contact:

Solar TRACE loading.