Abstract: A cutting plane consensus algorithm was implemented to solve the multi-area dynamic economic dispatch of large-scale power systems in a fully decentralized way. A local master problem was constructed in each area to approximate the original problem, cutting planes are transmitted among different areas, so an upper coordinator is unnecessary. Two modifications were developed: firstly, only the newest cutting planes are transmitted among different areas to reduce amount of information transferred; secondly, the cutting plane will be deleted if it could be inactive during consecutive iterations to reduce the iterations. The convergence and correctness can be guaranteed for power system with a wide range of scales, and the convergence speed is independent from parameter tuning. Hence, the proposed method can be directly used in different power systems without adjusting parameters. The 3-area IEEE RTS system and a real 4-area 2298-bus provincial power system were tested to demonstrate the effectiveness of the proposed method.