The IEA's Medium-Term Renewable Market Report now sees renewables growing 13 per cent more between 2015 and 2021 than it did in last year's forecast, due to stronger policy backing in the United States, China, India and Mexico, IEA said in a statement.
Over the forecast period, costs are expected to drop by a quarter in solar PV and 15 per cent for onshore wind.
Renewables have surpassed coal last year to become the largest source of installed power capacity in the world, it said.
About half a million solar panels were installed every day around the world last year. In China, which accounted for about half the wind additions and 40 per cent of all renewable capacity increases, two wind turbines were installed every hour in 2015.
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There are many factors behind this remarkable achievement: more competition, enhanced policy support in key markets, and technology improvements.
While climate change mitigation is a powerful driver for renewables, it is not the only one. In many countries, cutting deadly air pollution and diversifying energy supplies to improve energy security play an equally strong role in growing low-carbon energy sources, especially in emerging Asia.
Renewables are expected to cover more than 60 per cent of the increase in world electricity generation over the medium term, rapidly closing the gap with coal.
IEA said further said that while 2015 was an exceptional
year, there are still grounds for caution. Policy uncertainty persists in too many countries, slowing down the pace of investments.
Rapid progress in variable renewables such as wind and solar PV is also exacerbating system integration issues in a number of markets; and the cost of financing remains a barrier in many developing countries.
The IEA also sees a two-speed world for renewable electricity over the next five years. While Asia takes the lead in renewable growth, this only covers a portion of the region's fast-paced rise in electricity demand.
China alone is responsible for 40 per cent of global renewable power growth, but that represents only half of the country's electricity demand increase.
This is in sharp contrast with the European Union, Japan and the United States where additional renewable generation will outpace electricity demand growth between 2015 and 2021.