Unprofessional on Toronto Hydro's end and you can expect being ghosted throughout the entire process despite putting in effort to them.
3 rounds, the first is a basic phone screening that asks simple questions (e.g. Salary expectations, have you used Tableau, etc). The second was a 30 minute interview that involves you preparing a slideshow presentation for two engineers on how electricity is distributed in Ontario. The final round involved the heads of the new graduate program and was all behavioural questions.
Overall, a large waste of time and wouldn't recommend going with a company that wastes your time and energy as large as this one.