Hydropower

• Hydropower from flowing water. They are called renewable energy sources because they are naturally replenished.

Solar

• Every day, the sun rises, the plants grow, the wind blows, and the rivers flow. Renewable energy has been the primary source of energy for most of human history.

Wind

• Every day, the sun rises, the plants grow, the wind blows, and the rivers flow. Renewable energy has been the primary source of energy for most of human history.

Tidal

• Ocean energy in the form of wave, tidal, current energy and thermal energy of the ocean. Biomass from plants.

Geometry

• Geothermal energy from heat inside the earth; Wind energy. Biomass from plants; Hydropower from flowing water.