On the other hand, the Nexo is storing a much larger amount of energy. At 6.3 kg of hydrogen and at 33.3 kWh of usable energy per kg, that's 209.8 kWh. The Y on

On the other hand, the Nexo is storing a much larger amount of energy. At 6.3 kg of hydrogen and at 33.3 kWh of usable energy per kg, that's 209.8 kWh. The Y only stores 75 kWh in comparison. Fuel cells are around 60% efficient today. The system efficiency is probably around 55%. This is a number that will increase as fuel cells get more efficient. I believe the gap will eventually close altogether, or at least shrink greatly.