State tax credits also are a significant driver of EV interest. California has the highest EV adoption score in the country. Buyers there get $2,000 for a purchase or lease of an electric car and $4,500 for an electric truck, SUV or van. State-level EV incentives helped increase adoption in Oregon, Colorado, New York and New Jersey.
Declining prices and broader choice are contributing to rapid EV sales growth. J.D. Power expects three in four consumers to have a viable EV option by the end of 2026.
About 8.5 percent of new-vehicle sales and leases were EVs in the first two months of this year, a record high and almost double the share from a year ago, J.D. Power said.
New EV registrations surged 57 percent last year to 756,534, while the overall U.S. market fell 11 percent to 13.6 million light vehicles, according to Experian. EVs climbed to 5.6 percent of registrations from 3.1 percent a year earlier.
The research firm's EV affordability index rose to 87 on a 100-point scale in February, driven mainly by Inflation Reduction Act incentives. It hovered around 82 late last year. Once it climbs to 100, EVs will have reached price parity with internal combustion vehicles.
In Northern California, EV demand is "insatiable," said David Long, executive general manager of Hansel Auto Group, which has Ford, Lincoln, BMW, Subaru, Honda, Acura, Volkswagen and Toyota franchises.
Long's group sells every EV the brands ship, and he also has pre-orders. Hansel has more EV shoppers than both used-car and gasoline-powered new-car shoppers combined, but the closing ratio for EV shoppers is lower than for gasoline-powered vehicle shoppers.
Long said that many customers are curious about EVs but aren't ready to buy one.
Gasoline-powered car shoppers often know what they want when they come in to the showroom. With EVs, "there's so many questions about charging and things that they really want to hear another human being tell them and show them," Long said. "And I think that's where the closing ratio gets eroded."
Only one in 10 shoppers will buy an EV by the end of this year, J.D. Power said, despite the price drop and increase in inventory.
Long said that even with a lower closing ratio, EV shoppers still benefit Hansel's long-term business.
"We've had to become really, really good at being able to provide customers with information," he said. "The more we can communicate to our consumers, the more comfortable they will be (and) the easier it will be for them to make that decision to transition from ICE to EV."
Laurence Iliff contributed to this report.