(Chemical) hydrogen will be available much sooner than fusion. We should see a lot of hydrogen related infrastructure being deployed soon.
Carbon is one such atom.
https://old.reddit.com/r/energy/comments/22gryt/seawater_pow...
https://old.reddit.com/r/dredmorbius/comments/22k71x/us_navy...
Fischer-Tropsh (creating synthetic analogues of petrol, kerosene/jet fuel, or diesel), or Sabatier process (creating alcohol) are two options.
Yes, it's a net energy sink. You're trading cheap surplus electricity for high-density, long-term storable, stable, dispatchable thermal fuel.
You can store hydrogen in underground salt caverns. We could store years' worth of energy demand.