I'm absolutely not an authority in these matters, and any corrections are welcome and appreciated.)

From what I've read, "green" hydrogen made from electrolysis with energy from non-carbon-emitting sources extremely energy intensive, as is compressing it for transport. Transport is also expensive. To my knowledge, there aren't any pipelines in Western Canada that could transport it, so I guess it's trucks and train cars. But maybe there's potential there because hydrogen wouldn't need to be the backbone of the grid, it would just need to pick up the (substantial?) slack when renewables weren't producing.