The reduction is up more than 14% on the 10.4 million tonnes displaced by the sector in 2012 and is the highest reduction recorded in Scotland to date.
UK displaced 37.6 million tonnes of CO2 emissions while England, Scotland and Wales displaced 22.8, 11.9 and 1.9 million tonnes 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."
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."
The Committee on Climate Change has recently revealed that policies to support cleaner low-carbon electricity made up £45 of energy bills in 2013 in the UK.
The £55m contributed towards energy efficiency schemes in 2013 and helped to pay for 200,000 new boilers and heating controls to be installed in low-income homes.
Image: Green energy displaced 11.9 million tonnes of CO2 emissions in Scotland in 2013. Photo: Courtesy of Scottish Renewables.
