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E-unit(s) corresponding to this lesson plan. CAERT, Inc. http://www.mycaert.com. “Energy Sources,” energy4me. Accessed April 13, 2012. http://www.energy4me.org/ energy-facts/energy-sources/. “How Wind Turbines Work,” Wind Program. U.S. Department of Energy. Accessed April 16, 2012. http://www1.eere.energy.gov/wind/wind_how.html. “Hydroelectric Power: How It Works,” Water Science for Schools. U.S. Geological Survey. Accessed April 16, 2012. http://ga.water.usgs.gov/edu/hyhowworks.html. “Renewable Energy Articles,” Renewable Energy Index. Accessed April 16, 2012. http://renewableenergyindex.com/articles. “Renewable Energy Technologies,” Energy Basics. U.S. Department of Energy. Accessed April 16, 2012. http://www.eere.energy.gov/basics/renewable_energy/. U.S. Energy Information Administration. Accessed April 12, 2012. http://www.eia.gov/ forecasts/aeo/er/.