WWF lead with a Global Scenario for 100% Renewable Energy
Last month WWF published The Energy Report, a scenario for a 100% global renewable energy mix by 2050. Unlike zerocarbonbritain2030 the report covers only energy, rather than looking at all greenhouse gases.
WWF’s report takes a similar "power up / power down" approach. However the 50% powering down is not from 50% of current energy, rather it's a 50% reduction on a vastly increased amount of energy we'll be generating we 2050. So the 'power down’ actually results in us using roughly the same amount of energy we do at the moment. The scenario then outlines how we can get all of this energy from renewables.
WWF rely on roughly the same technologies as zerocarbonbritain2030. However there are some additional ones because of the global nature of WWF's energy mix - for example concentrating desert solar, big hydro and geothermal. It's difficult to make a direct comparison between the energy mix proposed by WWF and zerocarbonbritain2030 because WWF are looking at global energy. There are some notable similarities: they have excluded nuclear from the mix for roughly the same reasons we have (waste, fuel supply, risk). The WWF energy mix has a lot of concentrating solar in the Sahara. Their headline "If just 0.3% of the Sahara was a concentrated solar plant, it would power all of Europe". There is also a heavy reliance on wind - on and off shore. A key difference between scenarios is the amount of bio energy: the biggest part of the WWF energy mix is from bio energy from waste.
Just like in zerocarbonbritain2030, WWF anticipate a massive process of electrification in order to deliver the energy. This will mean upgrading the electricity grids of most developed countries and installing suitable grids in less developed countries. Like zerocarbonbritain2030 they also anticipate international electricity grids: while zerocarbonbritain2030 proposes a Europe-wide grid WWF propose a map for a global grid.
To read The Energy Report in full visit WWF.