At their 2005 summit in Gleneagles, G-8 leaders called upon the International Energy Agency to provide advice on scenarios and strategies for a clean and secure energy future. Energy Technology Perspectives is a response to the G8 request. This innovative work demonstrates how energy technologies can make a difference in a series of global scenarios to 2050. It reviews in detail the status and prospects of key energy technologies in electricity generation, buildings, industry and transport. It assesses ways the world can enhance energy security and contain growth in CO₂ emissions by using a portfolio of current and emerging technologies. Major strategic elements of a successful portfolio are energy efficiency, CO₂ capture and storage, renewables and nuclear power.