“Solar energy, radiant light and heat from the sun, has been harnessed by humans since ancient times using a range of ever-evolving technologies. Solar radiation, along with secondary solar-powered resources such as wind and wave power, hydroelectricity and biomass, account for most of the available renewable energy on earth. Only a minuscule fraction of the available solar energy is used.
Solar powered electrical generation relies on heat engines and photovoltaics. Solar energy’s uses are limited only by human ingenuity. A partial list of solar applications includes space heating and cooling through solar architecture, potable water via distillation and disinfection, daylighting, solar hot water, solar cooking, and high temperature process heat for industrial purposes. To harvest the solar energy, the most common way is to use solar panels.
Solar technologies are broadly characterized as either passive solar or active solar depending on the way they capture, convert and distribute solar energy. Active solar techniques include the use of photovoltaic panels and solar thermal collectors to harness the energy. Passive solar techniques include orienting a building to the Sun, selecting materials with favorable thermal mass or light dispersing properties, and designing spaces that naturally circulate air.”
Wikipedia. August 19th, 2010, http://en.wikipedia.org/wiki/Solar_energy 
Solar light and lighting products have made it a long way. Though we’d love to see more cost friendly solar options, some companies are paving the way to lower prices by taking advantage of supply and demand at lower rates.
SOL Inc, who focus on solar light and lighting solutions, donated over 130 solar lights for Haiti recovery and rebuilding efforts after the devastating earthquake in January 2010: http://www.solarlighting.com/
Please call Jules Dylan Stuer, at (214)802-7369, of http://www.advancedluxury.net, for more information about Dallas, TX based company: http://diezenergysolutions.com/, SOL, Inc. installations in Texas, Oklahoma, Louisiana, and Arkansas, that are tailored to fit your unique needs.