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....you need a truly vast pressure vessel to store an industrially useful quantity of energy. The practical limit of energy density is about 100 kJ/m3 so a tank the size of a garage, pressurised to around 50 atmospheres, will run the house for about 2 hours
Industrially, compressed air is considered the most expensive form of practical motive power! Why not use your windmill to compress air in the first instance, and cut out two stages of inefficiency?
Regarding hydrogen from electrolysis, it could be argued that efficiency isn't really important if the electricity is free
[electrolysing] hydrogen does at least heat the water, and we have plenty of uses for hot water - possibly half of all the electricity we use is for heating water anyway.
Hydrogen does not react with metals.
the main argument against windmills is that far from being free, they are horrendously expensive to build, maintain and scrap, so over a lifetime they produce ridiculously expensive electricity, even without storage.