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Renewable Energy

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/Sources_of_Electricity_in_the_US_2005_New.png]. Renewable Energy. Wind Energy

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Renewable Energy

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  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/Sources_of_Electricity_in_the_US_2005_New.png]

  2. Renewable Energy • Wind Energy • Windmills are used to turn generator turbines. • 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][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

  5. 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]

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

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

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

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

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

  11. 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]

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

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

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