From an energy standpoint, you need 50 to 60 kilowatt hours of electricity to produce one kilogram of hydrogen through electrolysis. Where those kilowatt hours of electricity come from doesn't matter. An electron is an electron. Whether that electron is produced from coal, nuclear, wind, solar or hydro, it all works the same in the electrolyzer.
The challenge is that if you want the hydrogen to be clean, the electricity has to be clean. It can be wind. It can be solar. It can be hydro. Nuclear is also another interesting option because it is baseload power. Using any surplus nuclear power production capacity, especially late at night, could be a very attractive option in the provinces that have that available as baseload power.