The diagram illustrates that how energy is transformed from coal to electricity. There are several machine (coal conveyor, pulveriser, furnace, turbine, cooler etc.) and steps which are used for this production.
Mining is first step for this diagram. After that, the coal which is obtained from underground is transferred to pulveriser thats why we need smaller pieces of coal for burning. Smaller parts of coal is burnt in furnace. So we can get high temperature. This burning process significant for cooler and turbine because temperature difference between furnace and cooler triggers turbine mil.
Addinitonally, this turbine is connected to generator which include electricity engine. Two cable go to transformer which was painted by green. As you can see, transformer has 2 input and 3 output that all of them connect to power lines.As a result, producing electricity begins with mining and finish power line. This process clarify how we obtain electric from coal.