Dear student,
Simply put, coal-fired electricity generation is a five-step process:
1. Thermal coal (either black or brown) that has been pulverised to a fine powder is burned
2. The resulting heat is used to turn water into steam.
3. The steam at very high pressure is then used to spin a turbine, connected to an electrical generator.
4. The spinning turbine causes large magnets to turn within copper wire coils; this is called the generator.
5. The moving magnets cause electrons in the wires to move from one place to another, creating an electrical current and producing electricity.
Regards.