Abstract: Spinning reserve allocation is a critical problem for the power dispatch with large-scale wind power penetration. A risk-based reserve allocation model is proposed which considers the coordination of different control area. The proposed model is suitable for rolling dispatch. The relationship between the expectation of loss load and spinning reserve is analyzed. The solutions are given for each control area’s reserve optimization problem. A particle swarm optimization method is used to solve the proposed model and numerical tests on IEEE 24 system are also given.