"Even if the solar cell market were to grow at 56 percent a year for the next 10 years ... photovoltaics would still only account for about 2.5 percent of globa

"Even if the solar cell market were to grow at 56 percent a year for the next 10 years ... photovoltaics would still only account for about 2.5 percent of global electricity" Ray Kurzweil claims a similar doubling time, but thinks that solar will approach 100% in ~16 years. I wonder who has better data. http://www.ted.com/talks/ray_kurzweil_announces_singularity_university.html http://www.ted.com/talks/ray_kurzweil_announces_singularity_... (He talks about solar around 5:45) Edit: Ah, fooled again by exponential grow. I did the math, and if 56% growth held for for an additional 6 years, 2.5% would turn into 72%. Which is surprisingly close to Kurzweil's predictions.