Some graphs.

http://sitemaker.umich.edu/section4group2/graphical_representation_of_solar_energy_use

My guess would be never. Renewables are about 6% of our total usage. Of that, about 1% is solar. About 50% is biomass and waste. This is the area that will probably continue to contribute the largest amount of renewable energy. As landfills are filled, there will be more pressure to reuse waste. This is probably where we will get most of the energy from renewables. I think that solar will top out at about 5%. That is still a lot of energy, and it will come mainly from residential rooftop solar embedded panels.

Like these;

http://www.smartroofsystems.com/

http://smartroofsystems.com/db2/00176/smartroofsystems.com/_uimages/EastRoofcompleteandvalcopy.JPG
Source(s):
http://sitemaker.umich.edu/section4group2/graphical_representation_of_solar...

http://www.smartroofsystems.com/

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