Central, semi-central, and distributed production facilities are expected to play a role in the evolution and long-term use of hydrogen as an energy carrier. The different resources and processes used to produce hydrogen may be suitable to one or more of these scales of production.
Hydrogen can be produced in small units where it is needed, such as vehicle refueling stations, in a manner known as "distributed production." Distributed production may be the most viable approach for introducing hydrogen in the near term in part because the initial demand for hydrogen will be low. Two distributed hydrogen production technologies that may offer potential for development are (1) reforming natural gas or liquid fuels, including renewable liquids, such as ethanol and bio-oil, and (2) small-scale water electrolysis.
Large central hydrogen production facilities (750,000 kg/day) that take advantage of economies of scale will be needed in the long term to meet the expected large hydrogen demand. Compared with distributed production, centralized production will require more capital investment as well as a substantial hydrogen transport and delivery infrastructure.
Intermediate-size hydrogen production facilities (5,000–50,000 kg/day) located in close proximity (25–100 miles) to the point of use may play an important role in the long-term use of hydrogen as an energy carrier. These facilities can provide not only a level of economy of scale but also minimize hydrogen transport costs and infrastructure.
The U.S. Department of Energy and others are analyzing the options and trade-offs for hydrogen production and delivery. Options other than distributed production may also play a role. For example, large hydrogen production facilities currently exist in or near petroleum refineries because they use hydrogen in petroleum processing. It might be possible to take a small fraction of this hydrogen and transport it to nearby refueling stations during the transition. Learn more about hydrogen delivery.