The China-in-Global Energy Model (C-GEM) is a global Computable General Equilibrium (CGE) model that captures the interaction of production, consumption and trade among multiple global regions and sectors – including five energy-intensive sectors – to analyze global energy demand, CO₂ emissions, and economic activity. The C-GEM model supplies a research platform to analyze China’s climate policy and its global implications, and is one of the major output and analysis tools developed by the China Energy and Climate Project (CECP) – a cooperative project between the Tsinghua University Institute of Energy, Environment, and Economy and the Massachusetts Institute of Technology (MIT) Joint Program on the Science and Policy of Global Change. This report serves as technical documentation to describe the C-GEM model. We provide detailed information on the model structure, underlying database, key parameters and its calibration, and important assumptions about the model. We also provide model results for the reference scenario and a sensitivity analysis for two key parameters: autonomous energy efficiency improvements (AEEI) and the elasticity of substitution between energy and value added.