Dr. Kohn, from the University of California in Santa Barbara, said that research and development will drive the shift towards a new era of energy generation as oil and natural gas will peak in 10 to 30 years from now. Fossil fuels currently account for 60 percent of global energy consumption.
Kohn highlighted that in order to get to the stage when wind and solar will become dominant it is important to continue scientific and technical progress in several clean energy alternatives. He added that efforts must be internationally coordinated, since the energy issue is global by nature.
Over the last decade, photovoltaic power increased by a factor of 90 while wind increased by 10.
I think specific countries will be powered predominantly by solar while some others could be by wind. Countries such as the UK are perhaps not the best suited for solar but have excellent wind resources (including offshore wind). Countries like India on the other hand could have solar powering it almost entirely in the next 25 years owing to the high solar radiation over large parts of the country, even though wind currently is the leading renewable energy producer in India (almost 75% of all renewable energy produced)
Narasimhan Santhanam – Energy Alternatives India – http://www.eai.in/ref/team/ns.html