Here is a plot about hydrogen in the United Kingdom.
The plot shows that energy factories need steady, very high temperature heat, around 1500°C, running continuously, and today they mainly burn methane gas.
Their plan is to switch to low carbon hydrogen, either ‘blue hydrogen’ made from natural gas with carbon capture and storage or ‘green hydrogen’ made by splitting water using renewable electricity.
But the central barrier is cost and complexity: hydrogen is still expensive to produce, transport and store, and it requires coordinated investment across multiple industries and public infrastructure.