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In 1838, Solar energy was discovered.
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In 1868, the water heater was patented.
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In 1876, the telephone was invented but was later patented in 1877.
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This was invented by Thomas Edison.
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In 1880, the free water jet turbine was invented.
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This windmill was the first for electricity.
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The inventor of the electric stove was copeman.
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In 1902, Commercial air conditioning was invented.
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In 1904, the first geothermal energy plant was invented.
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In 1927, the first demonstrations of tv signals occured.
