[krisoft]

Blue hydrogen is produced from natural gas.

Green hydrogen is produced from electrolysis of water where the energy is comming from a renevable source. (Imagine solar panels which are directly connected to an electrolysis plant.)

“Green-ish” hydrogen is produced from electrolysis of water where the energy is comming from the grid. (And thus as green as your grid is.)

[jasonkester]

Thanks. Any idea what “grey” would mean in this context?

[iamthemonster]

Grey hydrogen is produced from natural gas

Blue hydrogen is produced from natural gas with carbon capture