1. CONVENTIONAL OR NON RENEWABLE ENERGY: Power provided by traditional means with natural resources that cannot be replaced once it has been extracted from the Earth such as coal, wood, gas, etc and uranium and they are limited on the Earth.
1.1. Fossil Fuels: Energy from gasoline, gasoil, kerosene, gas, coal, etc. Example: Thermal Power Plant.
1.2. Nuclear: Energy from atoms.
1.2.1. Fusion: takes place in the Sun when two hydrogen nuclei collide together to form one nucleus of Helium giving heat. There isn’t any radioactive waste.
2. RENEWABLE OR ALTERNATIVE ENERGY: It uses natural resources such as sunlight, wind, rain, tides and geothermal heat, which are naturally replenished or replaced.
2.1. Solar: Energy from the Sun.
2.1.1. Photovoltaic solar energy: Transforms solar energy into electricity. Example: Photovoltaic Solar Power Plant.
2.1.2. Thermal solar energy: Transforms solar energy into heat. Example: Thermal Solar Home System.
2.2. Wind Power: Energy from the wind.
2.2.1. Aero-engines: from wind to mechanical motion. Example: an Ancient Windmill.
2.3. Hydraulic: Energy from the rivers and waterfalls
2.3.1. Hydro-engine: from the water movement to mechanical motion. Example: an Ancient Watermill.
2.3.2. Hydroelectric generator: from the water movement to electricity. Example: Hydroelectric Power Plant.
2.4. Biomass: from organic waste. Example: Biomass conversion into energy.
2.5. Geothermal: heat from the inner of the Earth. Example: Geothermal Power Plant.
2.6. Oceanic: Energy from sea movement.
2.6.1. Tidal: from the sea tides caused by the sun and the moon. Example: Tidal Power Plant.
2.6.2. Waves: we convert the kinetic energy of the waves into electricity. Example: Ocean Power Plant.
3. ELECTRICITY: It is a form of Energy, not a source.