There are methane fuel cells which operate on methane directly. No need to decompose the gas (edit: no need to decompose externally). The main issues are the cu

There are methane fuel cells which operate on methane directly. No need to decompose the gas (edit: no need to decompose externally). The main issues are the current methane fuel cells operate at very high temperatures of around 1000 C (built in steam reforming) requiring exotic materials. There are low temp catalyst materials in labs but they are consumable and have impractical service life.