EVs are 100%-powered by an electric motor, and emit no CO₂ gases. HEVs, or Hybrid Electric Vehicles, have both an electric motor and a traditional engine. Their battery is charged through regenerative breaking. PHEVs—such as the Mitsubishi Outlander Plug-in Hybrid—first utilize the electric battery and tap into the engine when more power is needed. Like electric vehicles, the battery can be recharged by plugging it in.