Per the California New Car Dealers Association (CNCDA), hybrid, plug-in hybrid, and fully electric vehicles together comprised 21% of all new vehicles sold in California during the first half of 2021: California New Car Dealers Association Releases Second Quarter Auto Outlook – California New Car Dealers Association
From the CNCDA's report:
"The electric and hybrid vehicle market continued its growth in California through the first half of the year. New hybrid vehicle sales saw a three percent increase to their share, making up 10 percent of the market, with new electric vehicle sales increasing one and a half percent to 7.8 percent. Plug-in hybrids doubled their share to 3.2 percent. In the first six months of the year, the market share for these vehicles increased significantly from 15 percent in 2020 to 21 percent through June of 2021."
From the CNCDA's report:
"The electric and hybrid vehicle market continued its growth in California through the first half of the year. New hybrid vehicle sales saw a three percent increase to their share, making up 10 percent of the market, with new electric vehicle sales increasing one and a half percent to 7.8 percent. Plug-in hybrids doubled their share to 3.2 percent. In the first six months of the year, the market share for these vehicles increased significantly from 15 percent in 2020 to 21 percent through June of 2021."