Hydrogen provides the lift that keeps the massive estates of the aristocracy afloat high above the plains of the American Colonies western frontier. Ironically, those estates are both literally and figuratively tethered to the ground and their dependence on the lower classes that produces the hydrogen.
Production of the hydrogen is based on steam reforming, or steam methane reformation of natural gas. One of the most common industrial approaches to manufacturing hydrogen and a number of other related products. In the Brymlight world, the Whitley Hydro-Works is one of the largest producers of hydrogen, what our boffins are going to call “diprotium” and the more common term everyone else regularly uses: Brym.
Just for fun… steam reformation, in a deeper meaning, also refers to my break from the more traditional steampunk doctrine.