The ability to use solar power for heat was the first discovery. A Swiss scientist, Horace de Saussure, built the first thermal solar collector in 1767, which was later used to heat water and cook food. The first commercial patent for a solar water heater went to Clarence Kemp of the US in 1891. This system was bought by two California executives and installed in one-third of the homes in Pasadena by 1897.

Solar cell technology dates as far back to 1839 when a French physicist Anotoine-Cesar Becquerel first discovered that the shining of light over an electrode submerged in a mixture of specific chemicals could create an electric current.

What are Photovoltaic cells? Photovoltaic c

1918: Polish scientist Czochralski developed a way to grow single-crystal silicon.

1980: The first William R. Cherry Award was given to Paul Rappaport, SERI's founding director. New Mexico State University, Las Cruces, was selected to establish and operate the Southwest Residential Experimental Station (SW RES). A 105.6-kW system was dedicated at Natural Bridges National Monument in Utah; the system used Motorola, ARCO Solar, and Spectrolab PV modules.

1887: Heinrich Hertz discovered that ultraviolet light altered the lowest voltage capable of causing a spark to jump between two metal electrodes.

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