Mr. Denis O'Sullivan:

As a component but also separate. There would normally be up to 2% hydrogen in the network. Our distribution network is predominantly polyethylene, as the Senator mentioned. That element of the distribution network can take 100% hydrogen. There are some components which would need to be replaced. Almost everything that is underground is already hydrogen-proofed. We are undertaking studies and tests on the material that is above ground to verify what percentage of hydrogen it could take or what we would have to do to make that 100% hydrogen-compatible. Our transmission network is a high pressure steel network. That can take a significantly higher percentage of hydrogen than is currently in the network but it cannot take hydrogen to the same degree as the polyethylene network because of the technical restrictions on metal and hydrogen mixing.