A comprehensive study from researchers at the Paul H. O’Neill School of Public and Environmental Affairs, led by Professor John Graham, tracking the evolution of the automotive market from 1999 to 2025 reveals that conventional hybrid electric vehicles (HEVs) are experiencing a major U.S. resurgence thanks primarily to product innovation and not federal or state incentives.
The article, “Rise, stagnation, and resurgence of hybrid electric vehicles in the U.S. market,” published in Transportation Research Part D: Transport and Environment, used vehicle registration microdata from the State of New York to find that HEVs are successfully displacing traditional internal combustion engine vehicles rather than competing with fully electric vehicles. Researchers found that automaker innovations, such as lower prices, improved vehicle performance, and larger cargo space, have led to the resurgence.
“Our findings suggest that at current market penetration levels, hybrids and plug-in electric vehicles are more complementary than directly substitutive,” Graham said. “Instead of holding back the electric transition, HEVs are acting as a powerful tool to pull mainstream consumers away from traditional gas vehicles, serving as a parallel pathway toward lower-carbon transportation.”
The data suggests a strong environmental impact as well. HEVs reduce fuel consumption by approximately 35-40 percent, which leads to lower carbon emissions, and as automakers continue to improve battery technology while pursuing innovation, the combination of HEV, battery, and plug-in electric vehicles could continue to grow in popularity.