It starts electrons moving down the wires of the can, just like peas moving down a straw. As long as the magnet is turning inside the wire, electrons are moving down the wires, the peas are moving down the straw. The electricity then goes to huge transmission wires that link the power plants to our homes, school and businesses. They do use gigantic turbines, which have blades that are turned by the steam, just as the pinwheel blades are turned by the steam from the tea pot. And of course, a teapot is not used to turn the turbines.
Most power plants are big boilers that burn a fuel to make heat.
That heat energy boils water to make steam. The steam is fed under high pressure to a turbine. The turbine spins and its shaft is connected to a turbogenerator that changes the mechanical spinning energy into electricity. At first the water just sat in it. Then you turned on the stove and gas or electricity was used to heat the water until it boiled and started turning the pinwheel.