There are no major economic or technical barriers to achieving 100 per cent renewable energy around the world by 2050, a Greenpeace report says.

The Energy [R]evolution 2015 outlook report outlines a plan for achieving the transition to 100 per cent renewable energy by phasing out coal, oil, gas and nuclear energy and how such a transition could be funded.

"It is the first comprehensive scientific report which has analysed the technical and economical pathways of a total global fossil and nuclear phase-out within one generation," said report author Dr Sven Teske, senior advisor to the Greenpeace International Climate and Energy Unit.

"It is not only possible ... but it is also cost neutral. As renewables don´t need fuels, the additional investments can entirely be refinanced (to 107 per cent) by fuel costs savings."