This Code provides procedures for performance testing of integrated gasification combined cycle (IGCC) power plants to determine fuel gas flow and quality, thermal efficiency (heat rate), and power output at specified operating conditions. It also provides procedures to determine the flow and quality of cleaned fuel gas produced by the IGCC plant. If electric power is the only product of the IGCC plant, this code provides procedures for determining Corrected net power, Corrected heat rate, and Corrected heat input.