Hyundai and its automotive sibling Kia plan to respectively introduce plug-in hybrid versions of the Sonata and Optima sedans with 2013 models.
Plug-in hybrids can be recharged at home from the mains supply, unlike conventional gasoline-electric hybrid cars are recharged only when the driver applies the brakes.
Hyundai and Kia until now have focused more on fuel-efficient gasoline vehicles rather the trend toward electric vehicles.
Hyundai plans to launch its hybrid version of the Sonata, its first global hybrid model, in South Korea in May. Kia is expected to debut the Optima Hybrid the same month.