The IEA and IRENA separately have examined the investment needs for energy sector pathways that would foster putting the world on track towards a significant reduction in energy-related GHG emissions until the middle of this century. Each institution has developed one core scenario that would be compatible with limiting the rise in global mean temperature to 2°C by 2100 with a probability of 66%, as a way of contributing to the “well below 2°C” target of the Paris Agreement. Both the IEA and IRENA analyses start with the same carbon budget for the energy sector. But the pathways to reaching the goal differ between the two analyses.
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http://www.irena.org/DocumentDownloads/Publications/Perspectives_for_the_Energy_Transition_2017.pdf