Abstract: The rational allocation of transmission and distribution costs for power grids with high renewables is an important problem to promote the construction of new-type power system. In this paper, a multi-stakeholder allocation model oriented to connection cost and reinforcement cost is proposed for the problem of transmission and distribution costs allocation bought by high renewables integration. For the connection cost, considering the difference in the cost-bearing capacity of renewables, renewable energy enterprise clusters are obtained based on heterogeneity, and hence connection cost is allocated based on cost responsibility measurement in the enterprise clusters. For the reinforcement cost, it’s divided between renewables and grid based on the cost-benefit, and the risks of renewable grid-connection are analyzed. Then, due to the shared attributes of reinforcement cost, a dual-layer cost allocation framework for renewable energy enterprise aggregation-alliance aggregation is constructed. Furthermore, the risk factors are introduced to quantify the impact of grid-connection risks on the reinforcement cost, and a nonseparable cost is regarded as a measure of renewable energy grid-connection risk. Consequently, a reinforcement cost allocation model based on EANS-Owen value is proposed. Finally, examples are given to verify that the proposed model can reasonably divert the transmission and provide theoretical support for power grid investment planning for new power systems.