1. Power Generation for Wroclaw
DT project by Malena, grade 7

2. Technologies options
Wind power
Coal power
Hydro power

3. Electricity generation
All technologies need a generator that turns. A rotating generator creates electrical power (voltage, current)
The difference between the technologies is how to make the generator turn.
Electricity is sent around the country using high- voltage power lines. Nearly all of the power we use comes from large power stations.

4. Wind power
Wind power plants use the wind. Wind blows into the blades (turbine) that start to rotate and turn the generator.
Advantages:
No pollution and very safe
No cost for any fuel. The wind is for free.
Rather easy and quick to install and take away
Renewable energy
Disadvantages:
Not so powerful, many mills are needed
Rather costly to build per power generated
The wind does not blow all the time
Noisy and some people find the mills ugly
Must be built where it is windy

5. Coal power
Coal powder is burned in high temperature to produce very hot water steam. This steam is put on the blades in a turbine that drives the generator to turn.
Advantages
Coal is cheap and is not scarce. A lot in Poland
Powerful, cheap produced electricity
Can be built almost anywhere
Disadvantages
Pollution
Global warming, not renewable energy
Expensive to take away
turbine

6. Hydro power
Water in a dam is let out through a hole deep under water. Then the pressure is strong enough to make the water turn the blades in a turbine that drives the generator to turn.
Advantages
Water is free
Very powerful, cheap produced electricity
No pollution
Renewable energy
Disadvantages
Have to build it at waterfalls. Can be far from cities
Bad for animals and fish after the dam
Expensive and long time to build
Expensive to take away
If the dam brakes it will be a very big problem

7. Wroclaw needs Power plant: 270 MW Energy use: 2,4 TWh
Available money: 1379 million zl
Company that can build
How fast is it needed?

8. Compare Coal Wind Hydro Pollution: A lot No Time to build: 3 years
Less than 1 year
Cost to build: $ Zl
22000$
77000 Zl
per mill $ Zl
Power output
500 MW
1.8 MW
102 MW
Cost to produce:
0.25 groszy Zl Zl
Powerful:
Yes
Many are needed
VERY
Near Wroclaw:
So so
Risk: NO
One

9. Chosen
Wind And Hydro
Because coal makes a lot of pollution and that is bad. For Wind the fuel is free and so for Hydro. Wind is also cheap and does not take a long time to build but the wind does not blow all the time. Hydro lasts for a long time and is very powerful but takes 3 years to build.

10. Informations: & Pictures:
Wikipedia Google
Wikispaces

11. Thank you for watching my presentation, I hope you liked it.