1. Alternative Energy

2. Alternative Energy No undesired consequences Renewable “Free Energy”
Lower Carbon Emissions

3. Alternative Energy
Solar
Wind
Geothermal
Hydroelectric
Biomass
Wave

4. Solar Energy
Every minute enough energy reaches the earth to power the planet for a year.
Solar Cells
Solar Water Heaters
Solar Furnaces

5. Solar Energy Advantages Disadvantages Free
Provides electricity to remote places
Disadvantages
Solar Cells are expensive
Doesn’t work at night or in cloudy conditions

6. Wind Energy Advantages Disadvantages No pollution Wind is not constant
Need several turbines close to a city to provide enough power
Turbines are expensive to build
Noisy and Unsightly

7. Geothermal Energy Heat energy from underground
Holes are drilled deep into the ground.
Cold water is sent down, heated by the earth, and comes back up as steam.
Steam turns turbines and generators.

8. Geothermal Energy Advantages Disadvantages Doesn’t require fuel
Power stations are small
Disadvantages
Cannot be built except in select locations
Harmful gases may come out with the steam
Shift in earth’s crust moves hot pockets

9. Hydroelectric Power Energy from falling water
Provides 20% of the world’s electricity
First harnessed in 1878
Dam is built to trap water, water is allowed to flow through dam, turning turbines.

10. Hydroelectric Power Advantages Disadvantages Very reliable
Energy (water) can be stored
Disadvantages
Dams are very expensive to build
Affects the landscape and surrounding organisms

11. Biomass Material from living things
Can be burned to heat water and create steam
Produces gas to turn turbines
Wood

12. Biomass Advantages Disadvantages Renewable Readily available
Not environmentally friendly

13. Wave Power The rising and falling of ocean waves acts like a turbine
Not reliable
Can only be built on coastal cities