Abstract: Energy storage has been considered as one of the most effective means to solve the decarbonization problem of power energy systems. However, the absence of an efficient carbon information transmission mechanism, coupled with limitations in the power supply infrastructure and line transmission conditions at certain demand-side energy storage locations, poses challenges to effectively reconciling economic viability with low-carbon usage imperatives. Therefore, this paper proposes a solution based on a carbon reduction cloud energy storage model, which utilizes marginal emission factors to reflect the reaction of demand-side energy storage charging and discharging behavior on carbon emissions in the power system. Based on energy storage resource sharing, flexible allocation of energy storage resources is achieved within a certain spatial range. First, a carbon information transmission mode for carbon reduction cloud energy storage is designed. Then, a basic operational architecture for carbon reduction cloud energy storage is constructed, and the main implementation forms of this model are analyzed. Next, the optimal operation model of the carbon reduction cloud energy storage system is established, and the carbon reduction allocation method for each energy storage user in the carbon reduction cloud energy storage system is proposed. Finally, the carbon reduction feasibility of the carbon reduction cloud energy storage model is analyzed, and the key factors affecting the carbon reduction effect of the carbon reduction cloud energy storage model are studied, verifying the effectiveness of the proposed method.