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The World Electricity Model (WEM) of the World Energy Projection System Plus (WEPS+) is a computer-based energy transformation model of the world electricity generation sector. This report describes the version of WEM that was used to produce the electricity generation projections published in the International Energy Outlook 2011 (IEO2011). The WEPS+ is a modular system, consisting of separate energy models that are joined together through the overall system model in order to communicate and work with each other. These models are developed independently, but are designed with well-defined protocols for system communication and interactivity. The WEPS+ modeling system uses a common and shared database (the restart file) that allows all the models to communicate with each other when they are run in sequence over multiple iterations. The system uses an iterative solution technique that allows for convergence of consumption and price to a simultaneous equilibrium solution.