Here is why blending clean #hydrogen into gas grids is such a colossally wasteful thing to do. Basically you go to all the cost, effort, leakage risk, etc of making clean hydrogen, and then do a bunch of low-value things with it. Taxpayers/ratepayers should rise up against this. 
I had to add an extra level, H, to account for how idiotic it would be to make clean hydrogen, stick it in the gas grid, and immediately use it to generate power. Even high-temperature industrial heat will only be an E or F when I eventually publish an update to the ladder.
As for the idea that you need blending in order to create an early market for hydrogen - bollox. The UK uses 700,000 tonnes of hydrogen for fertilisers and petrochemicals - all from fossil fuels. There's your early market, it's huge and used to handling hydrogen.
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