Mr. Denis O'Sullivan:

There are two options to produce hydrogen. The first option is through electrolysis, using renewable electricity. As we increase the level of penetration of renewable electricity, we will have occasions where that electricity is curtailed because we have too much. That is even the case today at times. One can use that electricity for electrolysis to produce hydrogen and inject that into the network. That is for green hydrogen. Blue hydrogen is produced by taking natural gas and, through a process of steam methane reforming, we split the natural gas into its component parts, hydrogen and carbon dioxide. We use CCS technology to store the carbon dioxide and we inject the hydrogen. That process can be done at scale. One, two or three plants may produce a significant volume of hydrogen. Green hydrogen, using renewable electricity-----