After reaching record levels in 2015, investment fell last year to $287.5 billion, according to researchers at Bloomberg New New Energy Finance (BNEF).
The fall was due in part to "further sharp falls in equipment prices, particularly in photovoltaics," it said.
But it also was down to a marked cooling in China and Japan, two key markets, where investment in renewable energies fell significantly on the previous year.
Following a record year in 2015, Chinese investment fell 26 percent to $87.8 billion, down from $119.1 billion, while in Japan it dropped 43 percent to $22.8 billion.
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"The government is now focused on investing in grids and reforming the power market so that the renewables in place can generate to their full potential."
Despite falling oil prices, which tend to reduce investment in energy efficiency, the renewables sector is growing rapidly, with 2016 a record year for offshore wind power where investment pledges rose 40 percent to $29.9 billion.
In the United States, investment in renewable energy fell 7 per cent to USD 58.6 billion, while in Canada, it slipped 46 per cent to USD 2.4 billion.
Across the Asia-Pacific region, which accounts for 47 percent of the global figure, there was an overall fall of 26 per cent to USD 135 billion, although Indian investment remained at almost the same level as 2015, at USD 9.6 billion.
By contrast, Europe bucked the overall trend, with a slight increase of 3 per cent to USD 70.9 billion, with the UK leading the pack for the third year in a row with investment of USD 25.9 billion, a rise of 2 per cent.
The picture was worse in developing countries where many projects did not secure funding before the year's end. South Africa saw investment fall 74 per cent to USD 914 million, while it was down 80 percent in Chile to USD 821 million.