1. Alternative Energy Sources Hydroelectric, Geothermal, Wind.

2. What is Hydroelectric Power?  An electrical power that is generated through the energy of falling water.

3. Hydroelectric Power  Where is it being used?  Hydroelectric power is mostly used in the mountains because there is enough space for reservoirs, used for dams.

4. Hydroelectric Power Advantages What are the advantages of hydroelectric power?What are the advantages of hydroelectric power?  The lake’s water can be used for irrigation purposes. Hydroelectric dams can be used for decades and they don’t depend on oils and other fuels.

5. Hydroelectric Power Disadvantages  What are the disadvantages of hydroelectric power?  Hydroelectric dams are very expensive, they depend on precipitation, and they can interfere with the surrounding wildlife.

6. Hydroelectric Power Dams WWWWhat are hydroelectric dams?  They are dams that are used to produce hydroelectric energy. They regulate flooding and improve navigation. The amount of energy that is produced depends on how much water passes through the dam.

7. Geothermal Energy  What is geothermal energy? Geothermal energy is energy derived from the heat from the interior of the earth.

8. Geothermal Energy  Where is it being used? GGGGeothermal energy is being used in heating systems for homes, buildings, and schools.

9. How is it being used?  Geothermal energy is being used by using pipes buried more than four feet in the earth. Electricity from under the earth works by tapping into steam or hot water reservoirs under earth. The heat is used to drive electrical generators.

10. Geothermal Energy Advantages. RRRRenewable source of energy NNNNon-polluting and environmentally friendly NNNNo waste IIIIt can be used directly to heat homes and other buildings. Disadvantages OOOOnly few sites have the potential of geothermal energy MMMMost cites are far from factories or markets. CCCCan release harmful gases. TTTTotal cost of the steam plant is very expensive.

11. Geothermal Energy.  Two pipes are put into the earth, one of them pumps cold water and then steam comes out through the second one.

12. What is Wind Power ? WWWWhat is it? Wind power is the conversion of wind energy into a useful form of energy, such as wind turbines to make electrical power, wind mills for mechanical power, wind pumps for water pumping or drainage, or sails to propel ships.

13. Wind turbines.  Wind turbines- A wind turbine comprises a tower, topped by an enclosure called a nacelle, and the rotor, which is the propeller-like structure connected to the nacelle.

14. Environmental conditions necessary EEEEnvironmental conditions necessary? WWWWind consistency; strong, steady wind, enough space to build the turbines.

15. Where is it being used? TTTThe United states- wind power is being used in various places across the nation IIIIndia- currently 5% of india’s energy is being supplied by wind power generation DDDDenmark- about 20% of the country’s energy is provided by wind power  Germany- over 10% of the nation’s energy is supplied by wind power  Spain- more then 11% of the country’s energy comes from wind power  Denmark- about 20% of the country’s energy is provided by wind power

16. How does it produce electricity?  The nacelle houses an electrical generator, power control equipment and other mechanical equipment, connected to the rotor blades. The wind strikes these blades and causes the rotor to spin. When the wind is strong enough, the rotational energy in the rotor is converted to electrical energy within the generator.  The voltage of the electricity produced by the wind turbine is then increased by a transformer and substation to enable it to be fed into the electricity grid.

17. Advantages  Advantages:  Wind energy is friendly to the surrounding environment  Wind turbines take up less space than the power station  Wind is free and so building turbines is worth while

18. Disadvantages  Disadvantages:  In many locations the wind’s strength is too low to support a wind turbine or wind farm.  Generally produce less energy than a fossil fuelled power plant creating the need for more then one turbine  The noise pollution can be bothersome to those living close to the turbine

19. The End