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Thomas Edison invents the light bulb.
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Commercial solar water heaters begin to appear in the 1890s in the U.S.
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The first Federal Water Power Act is in 1901.
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The Roosevelt Dam is constructed in Arizona.
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The Hoover Dam is created for hydroelectric power.
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The first commercial solar cell is made available to the public at $300 per watt.
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The Vanguard I is the first satellite to use solar energy to generate electricity.
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Arab members of OPEC proclaim an oil embargo on the U.S.
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A dramatic increase in oil prices in the U.S.
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Los Angeles company, Luz Co., produces 95% of the world's solar-based electricity.