* https://www.ieso.ca/power-data
Nuclear chugs along with the base load at 9000 to 9500 MW, next biggest is hydro with between 3000 and 5000MW (with some deep troughs at 2500). Wind is the third-biggest, but is very variable: it tends to peak where hydro troughs (2500). Natgas comes along every so often
Ontario retired all of its coal plants several years ago.
If I had a magic want in Ontario I'd say we should build another 2000-2500 nuclear plant, which would take care of some of the base load that hydro is handling. Then hydro would be more free to handle the variable load, and we could reduce/remove natgas.
Various CSV and XML files available with historical data:
* https://www.ieso.ca/en/Power-Data/Data-Directory
†Site run by the Independent Electricity System Operator (Ontario's grid).