C2ES evaluated the state of the EV charging network in Washington state as part of a project for the Washington State Legislature on new business models for public charging services. The assessment considered charging by location and power level, charging station density, and traffic conditions. Read the report here.
These interactive maps allow you to assess and explore overall travel potential for EVs throughout the state. The maps show the range of an EV that charges for a fixed period at different types of charging stations, and the risk that vehicles will not be able to access that charging location.
The circles in the images below show a vehicle’s expected range – about 40 miles for DC fast charging – after recharging at a publicly available station. The image on the left shows a single charging location (blue dot) in Wenatchee. The image on the right shows five charging locations around Vancouver, Washington, with overlapping charging locations denoted by a darker orange color, indicating a greater likelihood of charging station access.
The fixed-size circle shows the estimated distance that can be traveled following a reasonable amount of time to recharge a vehicle’s batteries. For direct current (DC) fast charging, circles are calculated assuming 30 minutes of charging at a conservative 30 kilowatts (kW). For alternative current (AC) Level 2 charging, circles are calculated assuming 90 minutes of charging at 6.6 kW. Both charging levels assume 3.5 miles traveled for each kilowatt-hour of battery energy stored. The resulting driving range calculations are then decreased by 20 percent to account for the lack of direct roads from an origin to a destination, yielding circles with a radius of 40 miles for DC fast charging and 28 miles for AC Level 2 charging.
The darker the circles, the more charging locations in an area, resulting in reduced risk of individual station outages or unexpected wait times. A viable public charging network should have multiple, reliable charging locations to overcome consumers’ fear of exhausting the vehicle’s battery energy during a trip or of needing to drive farther to find a station.