The GSI releases two papers reviewing the literature on subsidies to different energy technologies: in a paper on electricity generation, looking at fossil fuels, renewable energy and nuclear power; and in a paper on transport fuel, looking at fossil fuels and biofuels. 

• Subsidies and External Costs in Electric Power Generation: A Comparative Review of Estimates;
• and Subsidies to Liquid Transport Fuels: A Comparative Review of Estimates. 

The reports survey the publicly available estimates of subsidies to biofuels and conventional liquid transport fuels, and to electricity generation.