This study investigates the impact of electric vehicle (EV) charging demand on California's power distribution grid, a state that has enacted ambitious EV policies. By projecting EV charging profiles using a combination of travel demand models, EV adoption models, and real-world charging data, the authors find that by 2035, 50% of feeders will need infrastructure upgrades, and by 2045, this percentage will rise to 67%. The total capacity upgrade needed by 2045 is estimated at 25 GW, with corresponding costs ranging from $6 billion to $20 billion. While these additional costs will drive up electricity prices, they are offset by the growth in total electricity consumption, leading to a net reduction in electricity rates between $0.01 and $0.06/kWh by 2045. The study also reveals that residential areas will require twice as much infrastructure upgrade compared to commercial areas, highlighting the potential to reduce costs by shifting home-charging demand. The findings provide insights into distribution grid planning and suggest that regulatory measures are necessary to accommodate and mitigate the expected infrastructure strain.This study investigates the impact of electric vehicle (EV) charging demand on California's power distribution grid, a state that has enacted ambitious EV policies. By projecting EV charging profiles using a combination of travel demand models, EV adoption models, and real-world charging data, the authors find that by 2035, 50% of feeders will need infrastructure upgrades, and by 2045, this percentage will rise to 67%. The total capacity upgrade needed by 2045 is estimated at 25 GW, with corresponding costs ranging from $6 billion to $20 billion. While these additional costs will drive up electricity prices, they are offset by the growth in total electricity consumption, leading to a net reduction in electricity rates between $0.01 and $0.06/kWh by 2045. The study also reveals that residential areas will require twice as much infrastructure upgrade compared to commercial areas, highlighting the potential to reduce costs by shifting home-charging demand. The findings provide insights into distribution grid planning and suggest that regulatory measures are necessary to accommodate and mitigate the expected infrastructure strain.