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Before the 1700's, and before the Industrial Revolution, wood was the primary form of energy. http://www.eia.gov/todayinenergy/detail.cfm?id=10
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At the beginning of the Industrial Revolution, coal started becoming the primary form of energy usage. Coal was used in factories and other manufacturing plants. http://attentional-fitness.squarespace.com/discoveries/tag/catharsis
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The first natural gas well was built in the US. This became a primary source of the street lamps in the US. http://alternativeenergy.procon.org/view.timeline.php?timelineID=000015
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The first commercial oil well was built in Pennsylvania. This well provided energy for several consumers in the US.
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Thomas Edison built the first electrical plant in the US. This provided electricity for a great number of people in the New York area. http://instituteforenergyresearch.org/history-electricity/
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This windmill was the first windmill in the US to generate electricity. This is located in Cleveland, Ohio.
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In Boise, Idaho, the first geothermal energy plant was built. This started a movement for the creation of more geothermal energy plants. http://www.energy.idaho.gov/renewableenergy/history.htm
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The first nuclear energy plant that generated electricity was built in Idaho. This created a controversial debate regarding nuclear energy. http://alternativeenergy.procon.org/view.timeline.php?timelineID=000015
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The world's largest windmill farm is built in California, providing wind energy to a great number of people and builidngs in California.
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At 2009, the Three Gorges Dam in China finished, and this marked history, because it was the largest hydroelectric source of energy. http://www.stema-systems.nl/news.php?pid=21