Cost of hydrogen
The choice of a hydrogen production strategy greatly affects the cost and method of delivery. Central production plants can produce hydrogen at relatively low cost due to economies of scale, but the delivery costs are significant since the point of use is farther away. In comparison, distributed production facilities have relatively low delivery costs, but the hydrogen production costs are likely to be more significant than centralized production, as lower production volume means higher equipment costs on a per-unit-of hydrogen basis.
Hydrogen safety (Source: National Hydrogen Association)
Hydrogen is no more or less dangerous than other flammable fuels. However, its unique characteristics should be viewed as advantageous. Hydrogen is lighter than air and therefore it rapidly disperses in the event of a leak. This minimizes the possibility of accumulation and ignition. In the event that hydrogen does ignite, its flames generate low radiant heat due to the absence of carbon. This makes hydrogen substantially safer than conventional hydrocarbon fuels (such as gasoline) for users and first responders in the event of any accident.