The most sensible option would be to store the hydrogen geologically and burn it directly if you needed the power. If you want something transportable, methanol

The most sensible option would be to store the hydrogen geologically and burn it directly if you needed the power. If you want something transportable, methanol is the simplest fuel you can make, and is what typically gets used when fossil fuels aren't an option (e.g. Germany in WWII). No need for carbon capture, since any source of carbon will do, and plants will pull carbon out of the atmosphere as long as you run carbon negative.