What does the 'P' in 'PHEV' stand for?

The “P” in “PHEV” stands for “Plug-in,” as in plug-in hybrid electric vehicle.

Unlike a conventional hybrid, a PHEV has a larger battery that can be recharged from an external power source. It can typically drive a meaningful distance on electricity alone before its gasoline or diesel engine is needed.

The “HEV” portion means “hybrid electric vehicle.” A common mix-up is assuming the P means “power” or “parallel,” both of which describe ideas associated with hybrid systems but are not what the acronym expands to.

PHEVs combine the flexibility of an internal-combustion engine with the potential for low-emission electric commuting. Their real-world fuel savings depend heavily on how regularly the battery is charged and how far the vehicle is driven electrically.