Steam under pressure is forced into the chamber. The pressurised steam pushes against the blades of the turbine which causes the blades to turn. This turns a shaft which is connected to the generator. The sources of energy for creating thermo-electric power can include burning coal, oil, and using nuclear energy to create heat. All these sources of energy are from non-renewable resources and some types, particularly burning coal, can cause pollution which can damage the environment.
Nuclear energy is probably the most efficient way of creating thermo-electricity.
Ontario has several nuclear power plants and some of the electricity that comes to your home may come from this source. Hydro-electricity uses the power of falling or flowing water to generate electricity. This water comes from rivers and even waterfalls. Niagara Falls has a hydro-electric power plant at the base of one of the falls. The advantage to using water as a source of energy is that it is renewable.