Affiliation:
1. Civil and Environmental Engineering, Institute of Transportation Studies, University of California, Davis, CA 95616
Abstract
California, a pioneer in EV adoption, has enacted ambitious electric vehicle (EV) policies that will generate a large burden on the state’s electric distribution system. We investigate the statewide impact of uncontrolled EV charging on the electric distribution networks at a large scale and high granularity, by employing an EV charging profile projection that combines travel demand model, EV adoption model, and real-world EV charging data. We find a substantial need for infrastructure upgrades in 50% of feeders by 2035, and 67% of feeders by 2045. The distribution system across California must upgrade its capacity by 25 GW by 2045, corresponding to a cost between $6 and $20 billion. While the additional infrastructure cost drives the electricity price up, it is offset by the downward pressure from the growth of total electricity consumption and leads to a reduction in electricity rate between $0.01 and $0.06/kWh by 2045. We also find that overloading conditions are highly diverse spatially, with feeders in residential areas requiring twice as much upgrade compared to commercial areas. Our study provides a framework for evaluating EVs’ impact on the distribution grid and indicates the potential to reduce infrastructure upgrade costs by shifting home-charging demand. The imminent challenges confronting California serve as a microcosm of the forthcoming obstacles anticipated worldwide due to the prevailing global trend of EV adoption.
Publisher
Proceedings of the National Academy of Sciences
Reference55 articles.
1. International Energy Agency Electric vehicles. https://www.iea.org/reports/electric-vehicles. Accessed 11 October 2021.
2. California Code of Regulations Section 1962.4 zero-emission vehicle requirements for 2026 and subsequent model year passenger cars and light-duty trucks (2022). https://ww2.arb.ca.gov/sites/default/files/barcu/regact/2022/accii/acciifro1962.4.pdf. Accessed 7 September 2023.
3. Quantifying the benefits of electric vehicles on the future electricity grid in the midwestern United States
4. T. T. Mai “Electrification futures study: Scenarios of electric technology adoption and power consumption for the United States” (NREL/TP-6A20-71500 National Renewable Energy Laboratory Golden CO 2018) 10.2172/1459351.
5. Simulating the value of electric-vehicle–grid integration using a behaviourally realistic model