The amount of energy to crack water is already only a small multiple of what you get back when you get the products back together. The improvements are in the

The amount of energy to crack water is already only a small multiple of what you get back when you get the products back together. The improvements are in the cost of equipment per unit output capacity, and the production rate per unit volume of said equipment. Improvements are cumulative. Airports, steel mills, and ammonia synthesizers will need to produce huge amounts of H2, soon, so reductions are important.