ive been googling all day, but have come up with nothing 
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{ 1 comment… read it below or add one }
Depends on what you mean by solar powered homes.
Passive solar has been used since the beginning of time to heat and cool houses, it’s all about working with nature to allow the sun in in the winter and shade it in the summer.
Solar water heating began in 1891 in Southern California, houses would pump the water to a collector on the roof to heat the water. This was then popular in Southern Florida in the 1920′s and 30′s, In 1941 most homes in Miami had solar water heating until WWII made getting copper too difficult. The Carter administration made solar water heating popular again in the 1970′s and 1980′s with strong tax incentives, which the Reagan administration canceled, thus dealing a blow to the solar industry. Incentives and popularity were both restored in 2003.
Solar electric panels were developed as part of the space program in the 1950s and were first too expensive for residential use. They started becoming efficient enough for home use in the 1980′s.
There’s an excellent timeline at http://www1.eere.energy.gov/solar/pdfs/solar_timeline.pdf. (google “history of solar electric panels”)