Although the EPA both anticipates and encourages the use of low-emissions hydrogen to achieve overall emissions reductions—instead of reductions only at the power plant unit—it does not define nor require low-emissions hydrogen to comply with regulations.
Hydrogen in Transportation Most fuel cell electric vehicles (FCEVs) are powered by hydrogen (H2) and considered zero-emission vehicles (ZEVs). FCEVs are like battery electric vehicles (BEVs) in that they are both electric vehicles (EVs) that use an electric motor instead of an internal combustion engine to power the wheels. However, while BEVs run on batteries that are plugged in to recharge, FCEVs produce their electricity onboard. Hydrogen can be used as fuel in a variety of fuel cell electric applications to generate power, emitting only water and heat as byproducts. The conversion of hydrogen to electricity emits no pollutants that affect public health and minimizes greenhouse gases (GHG) that contribute to climate change.