1. Renewable Energy Renewable resources can be replaced quickly as they are used up. Make up about 10 % of our electricity usage [http://upload.wikimedia.org/wikipedia/commons/5/51/So urces_of_Electricity_in_the_US_2005_New.png]

2. Renewable Energy Wind Energy Wind Energy Windmills are used to turn generator turbines. Windmills are used to turn generator turbines. About 20-25% efficient. About 20-25% efficient. [http://www.turf.uiuc.edu/recent/recent1998/misc/ CALIFORNIA%20WINDMILL%20FARM3.JPG]

3. [http://www.deed.state.mn.us/lmi/__shared/ assets/0401rs19664.gif]

4. Prices are low after up front costs are taken care of (land, turbines, etc…) Right now, operating wind energy is $0.03-0.04 per kWh

6. Renewable Energy Hydroelectric Energy Allow water from rivers or dams to turn a turbine. Also tidal energy on the coasts. [http://upload.wikimedia.org/wikipedia/en/8/81/Hydroelectric_dam.png]

7. Renewable Energy About $0.04/kWh About $0.04/kWh Usually high efficiency (30-35%) Usually high efficiency (30-35%) In large applications, flooding occurs behind the dam. In large applications, flooding occurs behind the dam. Other biological or environmental impacts. Other biological or environmental impacts.

8. [http://www.bpa.gov/Power/pl/columbia/gallery/ladder1.jpg]

9. Renewable Energy Solar Energy Solar Energy Photovoltaic cells convert sunlight into electrical current. Photovoltaic cells convert sunlight into electrical current. One type of system acts as a battery, so no generator is involved. One type of system acts as a battery, so no generator is involved. [http://www.epa.gov/greeningepa/images/facilities/rtp_roof.jpg]

10. [http://www.apec-vc.or.jp/solar_r/outline/img/outlne03.jpg]

11. [http://www.eere.energy.gov/tribalenergy/guide/im ages/chart2_solar_pv.gif] About 10-25% efficient depending on type Currently around $0.18 per kWh

12. Renewable Energy Another system “focuses” sunlight to heat water and create steam. (Generator is used here!) [http://www1.eere.energy.gov/solar/images/photo_troughs_nevada_one.jpg]

13. Renewable Energy Geothermal Energy Geothermal Energy Using heat from the earth to turn the turbines of a generator. Using heat from the earth to turn the turbines of a generator. About 16-20% efficient. About 16-20% efficient. About $0.05 per kWh About $0.05 per kWh [http://www.informaction.org/images/energy_drysteam1.gif]

14. [http://www.geo4va.vt.edu/A1/US-geothermal.gif]