Just to give you an idea, how good some studies are. This is the quality of the World Energy Outlook report from the IEA:
The WEO 2010 projections for solar PV capacity for the year 2024 (180 GW) have been achieved in January 2015 and exceeded threefold the WEO projections for 2015.
Real wind capacity in 2010 exceeded 260% and 104% the WEO 2002 and 2004 projections respectively for this year. WEO projections for wind energy from 2002 for 2030 had been achieved 20 years earlier, in 2010.
Independent analysts have been more correct in their projections of the successful expansion of renewable energy than the WEO. Only forecasts of the conventional energy industry, including BP, Shell and Exxon Mobil, were similarly low as IEA projections.
WEO projections overestimate the potential of coal industry in the last years and do not reflect the latest trend of divestment of finance from the coal industry in the last years as well as China’s starting coal exit and increasing investment in renewables.
WEO from 2000 to 2006 highly overestimated oil-based electricity.
Despite a decline of nuclear energy in the last 10 years, WEO still projects an annual expansion of about 10 GW nuclear in the next decade. Given a few commissioned and financed nuclear projects and the 100-200% overruns over the planning costs in Europe and delays, WEO projections appear highly overestimated.
Just to give you an idea, how good some studies are. This is the quality of the World Energy Outlook report from the IEA: