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Wind Power Produced 140% Of Electricity Demand in Denmark
(cleantechnica.com)
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no, it requires a lot of heat. but on the other hand it binds hydrogen into a more stable form and can be made with captured carbon.
Ammonia requires hydrogen and nitrogen from the air. Both certainly are more stable than hydrogen on its own.
yeah ammonia is also a good idea. a lot harder to handle safely though, it tends to corrode things.