The UK had displaced 37.6 million tons of CO2 emissions whereas England, Scotland and Wales displaced 22.8, 11.9 and 1.9 million tons respectively.
Scottish Renewables senior policy manager Joss Blamire said: "This means that not only are renewables now the number one source of electricity in Scotland, but we have achieved this milestone while preventing a record amount of harmful carbon emissions from being released into our atmosphere.
"Renewable energy in Scotland is doing exactly what it was designed to do: creating jobs, securing our energy supplies and, most importantly, reducing our carbon emissions to help limit climate change."
The reduction marks more than 14% on the 10.4 million tons displaced by the sector in 2012.
WWF Scotland director Lang Banks added: "That renewables in Scotland are now helping to displace almost a million tonnes of climate pollution every month is fantastic news and proof that a renewable power sector is the foundation of a truly low carbon economy – keeping the lights on, creating jobs and cutting emissions."
Recently, the Committee on Climate Change has revealed that policies to support cleaner low-carbon electricity made up £45 of energy bills in 2013 in the UK.
