With the development of power-to-gas technology

the coupling between a power system and a natural gas system concerned is gradually strengthened. The traditional mode of separately planning a power system and a natural gas system is no longer applicable for a closed-loop operated electricity-natural gas energy system or an integrated electricity-gas energy system(IEGES). On the other hand

demand side management can optimize the power load profile

contribute to load shifting and enhance the capability of accommodating intermittent renewable energy generation

and hence promote the secure and economic operation of the whole IEGES. Given this background

the collaborative planning problem of IEGES is studied

with demand side management(DSM)taken into account. First

DSM is modeled with the satisfaction of customers respected. On this basis

a mixed-integer nonlinear programming model is presented for the planning of natural gas-fired units

power to gas(P2G)devices

transmission lines and natural-gas pipelines in an IEGES

with an objective of minimizing the total costs including the investment cost

operation cost and compensation cost for DSM. To speed up the solving procedure

this mixed-integer nonlinear programming model is transformed into a mixed-integer linear programming one by linearizing nonlinear terms and then solved by the commercial solver AMPL/CPLEX. Finally

the presented model and method are demonstrated by an IEGES including a modified version of the IEEE 39-bus power system and the Belgium 20-bus natural gas system

and the effects on cost saving and the promotion of the accommodating capability for wind power generation are examined as well.