Hydro ElectricityIntroduction
Hydro electricity is renewable energy.Ontario has been using water to make electricity for over a century. In fact, some of Ontario's hydroelectricity stations are over 100 years old and still generating electricity for us today. Hydroelectricity power stations convert the kinetic energy of falling water into electrical energy. A dam is built to trap water, usually in a velley where there is a existing lake. water is allowed to flow through tunnels in the dam, to turn turbines and thus drive generators. Notice that the dam is much thicker at the bottom than at the top, because the pressure of the water increases water increases with depth. Hydro- Electricity power stations can produce a great of power very cheaply.
* once the dam is built, the energy is virtually free.
* no waste or pollution produced.
* much more reliable than wind, solar or wave power.* water can be stored above the dam ready to cope with peaks in demand.* Hydro-Electric power stations can increase to full power very quickly, unlike other power stations.* Electricity can be generated constantly.* Hydroelectricity is renewable energy so we can use hydro again and again.


* The dams are very expensive to build. however, many dams also used for flood control or irrigation, so building costs can be shared.* Building a large dam will flood a very large area upstream, causing problems for animals that used to live there.* Finding a suitable site can be difficult- the impact on residents and the environment may be unacceptable.
Hydro Electric Generating System


How does generate system works? Water is collected at the top of the dam called FORE BAY. Form there, the water flows into called a PENSTOCK which carries water down to a turbine WATER WHEEL. The water pressure increases as it flows down the PENSTOCK. The pressure and flows of the falling water through a turbine which in turn spins a generator. This produces electricity that can be sent across transmission lines whenever the power is needed