This EVs in Colorado dashboard is made possible through a collaboration between the Colorado Energy Office (CEO), Colorado Department of Motor Vehicles (DMV), Colorado Interactive and Atlas Public Policy. DMV, through Colorado Interactive, provides vehicle registration data to Atlas Public Policy. Atlas Public Policy runs this data through its vehicle identification number (VIN) decoder to identify EV make and model - see this document for information on how Atlas Public Policy processes vehicle registration data. Users should note that some of the historical data (pre-2019) came from DMV's legacy system and may contain inaccuracies. For example, according to the dashboard, registered EVs went down in December 2018 compared to the same period in 2017, which is most likely not the case. CEO and Atlas Public Policy will continue to refine this dashboard over time.
Note on Utility Layer: EV numbers by utility are estimates only as each utility territory in the utility layer is based on whichever utility has the greatest number of accounts in any given zip code.