The document discusses various renewable energy sources, particularly focusing on hydroelectric power generation from flowing water, which has a lower environmental impact compared to fossil fuel power plants. It highlights the operational principles of hydroelectric plants, the construction of dams and their environmental consequences, and other renewable methods such as tidal and wave power. Additionally, it mentions geothermal energy as a reliable renewable source, emphasizing the importance of sustainable energy practices.

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2. Nowadays, the environment is very
important in every country. Obtaining
energy from flowing water is one of the
renewable energy sources and its impact on
the environment is much smaller than, for
example power plants that burn coal, oil or
gas. A number of so-called emerging
hydroelectric power plants that are located
on the river and use flowing water to
generate electricity is bigger and bigger

4. The principles of the operation of the
power plants:
Water affects the turbine blades and drives it, that sets in
motion, and drives a generator, producing electricity.
Then the water is discharged back into the river bed and
continues the established electric energy is transferred to
the power network

6. -Thermal Power Plants - Nuclear Power Plants
-Hydropower Plants -Unconventional Power

7. The largest hydroelectric plants in the world

8. The Three Gorges Hydropower ( China ) :

9. The Itaipu Hydropower ( Brazil , Paraguay )

11. Dams - required build dams on the rivers

12. Problems caused by the dam :
When a dam is constructed, the destruction
of the environment is highly visible. The
problems caused by the dam
-Increase flood risk
-Hamper navigation
-Lower groundwater tables
-Cause an accumulation of toxic materials
-Affect entire ecosystems

13. Pumped-storage - involves draining the second tank located at a high altitude

14. Cross section of pumped-storage power plant

15. Run of the river - do not pile up water and do not require the
creation of inundations. Their power is limited by the power
of flowing water

16. Cross section of Run-of-the-river hydroelectricity

17. Tidal power plants
How do they work ?
The regularly repeated rise and fall of the water
level in the ocean is called the tidal
phenomenon, which is caused by the
gravitational forces of the Moon and the Sun. It
is the new way of producing energy.
Also called tidal energy, is a form of hydropower
that converts the energy of tides into useful
forms of power, mainly electricity.

18. Where can we find it ?
France has opened the world's first tidal power in
November in 1966 .

20. Wave power
The first wave power station was established in the United States. But
attached permanently subjected to movements of the waves, so that
placed in the middle of the float rises and falls by moving the piston.
This rotates the generator and so electricity is sent to shore underwater
cable.

21. FIRST TYPE

22. SECOND TYPE

23. Geothermal
Geothermal energy uses the heat stored in the Earth to
generate electricity and heat, producing one of the most
reliable and constantly available sources of renewable
power.

24. Nuclear power plant
Water is needed to cool the reactor

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