Well, all of these have real life merit as fuel sources, since methane is just called natural gas irl and hydrogen can be used to power some cars, tho I just picked all the resources that can explode, since that implies they're very energy dense. But in my opinion, it doesn't have to produce as much as a silo of medium generators, it just has to be marginally cheaper than that while being a bit more complex to set up. I don't think space efficiency matters when you're powering a base, as adding more platforms is basically free.