When new energy systems, energy storage devices, and all client devices are connected to power system, grid harmonic content will increase significantly, and the traditional energy metering system has been unable to meet the needs of multi-energy metering access to the grid. This paper analyzes the impact of various aspects of energy consumption metering, and proposes a new measurement scheme. Based on the use of intelligent instruments, a harmonic metering module is increased in particular. It eliminates harmonics firstly to improve the accuracy of the sampling aspects without disturbance, and then uses dq coordinate system to quickly and accurately estimate the harmonic grid voltage. Simulation results show that the scheme can effectively estimate the harmonic value, thus achieving a more accurate measurement of electricity when new energy is connected to the grid. This work is supported by Science and Technology Project of Chongqing Electric Power Company (No. 2016 YD S& T 60#) and Science and Technology Program of Changsha City (No. K1501012-11).