When producing green hydrogen from renewable electricity, 1/4 to 1/3 of the energy is lost as heat. Unless that's put to use to heat buildings, via district heating. Budding plans in the Rotterdam area! …https://www-portofrotterdam-com.cdn.ampproject.org/c/s/www.portofrotterdam.com/nl/nieuws-en-persberichten/waterstoffabrieken-nieuwe-bron-van-duurzame-warmte-voor-zuid-holland?amp

Another ‘byproduct’ of green hydrogen production through electrolysis of water is: pure oxygen, offering potential synergy with processes that need that.

Offshore electrolysis could be attractive in combination with far offshore wind, because it can save on expensive HVDC electricity connections. But it will be hard to get value out of the heat and oxygen it produces.

See why system integration is the fun part of the energy transition? So much to gain, and pretty complicated too ;)