https://globalnews.ca/news/5329835/canadas-nuclear-waste-to-... covers waste disposal in Ontario. I'm not sure why government subsidies or not would matter, it's a Crown Corp handling the disposal from the OPG. Hydro One is in charge of transmission, servicing, and fee collection, and seems to be doing just fine after its privitization.
So, in short: It's 9 cents per kWh during the day, and 5 cents per kWh during the night, because that's what it costs.
If day price is twice higher, then that's a totally different price! I am pointing it out because UK price of electricity is higher.
You are right to point out that Canada has untapped hydroelectric resource, it's by far the cheapest electricity.
However it can't supply entire energy need of most nations (some have none), and it is usually tapped wherever possible - people are usually not just sitting around ignoring it.
https://globalnews.ca/news/5329835/canadas-nuclear-waste-to-... covers waste disposal in Ontario. I'm not sure why government subsidies or not would matter, it's a Crown Corp handling the disposal from the OPG. Hydro One is in charge of transmission, servicing, and fee collection, and seems to be doing just fine after its privitization.
So, in short: It's 9 cents per kWh during the day, and 5 cents per kWh during the night, because that's what it costs.