Abstract: In the background of energy transition, clean and low-carbon power systems will promote the development of traditional power systems to new power systems dominated by renewable energy. The power supply guarantee and safe and stable operation ability of the new power systems will be greatly challenged by the high proportion of renewable energy. The traditional power system operation mode solely relying on the power-side resources cannot meet the requirements of safe, stable and cost-effective power supply.The potential of demand-side resources must be fully tapped to transit from“source follows load”to“source interacts with load”. In this paper, firstly, the new situation of safe, reliable and economic power supply faced by the new power systems is described. Secondly, the practice of demand-side resource utilization at home and abroad is studied and analyzed. On this basis, the key technologies of demand-side resource utilization for the new power systems are put forward. The demand-side resource utilization of China’s new power systems is prospected from five aspects of resource development focus, operation management,market mechanism, policy measures, and business model.