WEC decided at its Sydney Congress in 2004 to build new energy Scenarios with three principal changes from previous work. First, the Scenarios should be based on policy and on “bottom-up” regional and specialist work of the Member Committees of WEC. Second, they should test plausible storylines against the criteria of the WEC sustainability goals of energy Accessibility, Availability and Acceptability (the 3 A’s). Finally, they should have a sufficiently long-term focus to underpin clear recommendations on policies and actions that will achieve targeted results by 2050