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China’s CO2 emissions trading system, the world’s largest, aims to significantly reduce CO2 emissions. The system is a tradable performance standard (TPS), differing from cap and trade (C&T). We provide a dynamic general equilibrium assessment that uniquely considers institutional and fiscal features of China that affect policy costs and distributional impacts. Key findings: the TPS’s environmental benefits exceed its costs by a factor of five or more. Interactions with the fiscal system reduce or eliminate the TPS’s cost disadvantage relative to C&T. Introducing auctioning as a complementary source of allowance supply can reduce costs by 30%.