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Storing half a year's worth of hydrogen? That seems... improbable to be viable any time soon.

One option is to combine it with other elements providing long-term stable fuel stores.

Carbon is one such atom.

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.