As the rapid growth of gas-fired generators and the development of power-to-gas(P2G)technology intensify the interdependency between electricity and natural gas system,it is imperative to co-optimize the two systems synergistically.In China,the electricity system and natural gas system belong to different investment and decision makers,which means the two systems can only share little information with the help of an isolated coordinator.To adopt this situation,a distributed coplanning method of integrated e...