Abstract: Renewable energy integration becomes an increasingly critical issue in China. The amount of curtailed wind and solar energy hit new record in 2015, which mainly happened in the“Three Norths” area of China. Based on abundant data, current situation of renewable energy integration in the“Three Norths” area is analyzed first, and then in-depth analysis of reasons of large amount of renewable energy curtailment in these areas is also performed. Analysis shows that strengthening power grid construction is the solid foundation to solve renewable energy integration issue, and implementing heat and power decoupling is an effective meansure to alleviate renewable energy curtailment. Furthermore, improvement of relevant policies will provide instituional guarantee for renewable energy integration, while both market and planning methods are basic solutions for solving renewable energy integration issues.

Key words: renewable energy, integration, wind energy curtailment, solar energy curtailment