According to this presentation
http://www.worldenergyoutlook.org/media/…/factsheets.pdf
Global power generation is about 5,890GW in 2012. By the 2035, this number will double to some 12TW.
Out of that if we estimate 24% be solar, this means about 2,827GW of power generation. Probably by 2024 world would start to install in area of 100GW per year with the growth of 10% per year the number in 2035 will reach 290GW/y. In 2035, the world prices of energy will be at least 30% higher in locations like Japan, but In China and the US around is predicted at low 15%. Every year after 2040, at least 100GW would be required to maintain infrastructure. PV and wind does not affect water levels as a resource. Fossil fuels and NG do. Another reason why PV is going to be more and more the choice, due to water disappearing.
This is what is called world efficient energy concept.
In another study published in 2010 IEA predicted by the 2050, there will be at least 3000GW
http://www.iea.org/publications/freepubl…/pv_roadmap.pdf
Industry scenarios are hitting 2,000GW by 2030 so I picked concept of one between
If to believe 60GW capacity today, by 2017 this capacity will be running at 87%, my figures are closer to 40GW bankable, by 2014 expansions are required to cover for the deficit.