Comments by "John Burns" (@johnburns4017) on "The truth about hydrogen fuel cell cars" video.

To replace natural gas, the distribution pipe pressures would need to be higher with new regulators at the meters. Per cubic metre of gas natural gas holds about 3 to 4 times the energy. Gas appliances would need to be replaced or adapted. It gets to the point that going directly to all electric would be a better, and safer, option avoiding hydrogen burning in homes all together.
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Hydrogen fuel cells cost approx the same as an equivalent kW output diesel engine.
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Germany has hydrogen fuel cell trains in fare paying service. The UK is to trial them on the Liverpool to Chester line via Runcorn. Electrification of the UK rail network, which is very expensive to install and maintain, has been put on hold in view of introducing hydrogen fuel cell trains. These will be highly cost effective. The initial run out for trains is electric/diesel hybrids, which can be easily converted to hydrogen/electric keeping the same electric running gear. Some will be capable of running under electric wires, then on diesel, then eventually hydrogen, when running away from the electric wires. Diesel trains pour out a high level of pollution in urban areas, so all looks good for hydrogen trains. Hydrogen will probably not be suitable for cars, just large vehicles like: trains, ships, trucks, buses, etc. In the UK and Germany the level of fossil fuel free electricity generation is high. So when no wind or at night, the stored energy, in hydrogen, is used.
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A company put forward a proposal to convert the natural gas pipe network in the city of Leeds to run on hydrogen. So all appliances converted to run on hydrogen.
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Hydrogen trains are in fare paying use in Germany. The UK has suspended all electrification of the rail network. 30% is unelectrified using dirty diesel trains. Electrifying rail tracks is very expensive to construct and maintain, making no economic sense on services on low frequency lines. Hydrogen fits the bill. The hydrogen can be produced at the train depot, not needing hydrogen tanker transports - safer and cheaper. Hydrogen can be produced when too much electricity is being used or in low usage times like at night. Hydrogen can be produced by wind and wave. I saw one calculation that indicated it was cheaper for the train network operator in the UK to buy and install wind turbines that fed into the grid to produce the hydrogen, rather than electrify lines. They meter how much is fed into the grid and how much is taken from the grid to make the hydrogen. Simple, just using the grid's cables to get from A to B.
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Hydrogen has been suggested as a buffer for the electricity grid to eliminate peaker power stations. When too much electricity is being used it is then stored, in some cases maybe in underground caverns. Then used later.
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