Abstract: As continuous growth of the installed capacities of renewable energy in China, the curtailments of wind, solar and water energy has become increasingly serious, especially in the "Three North"(i.e., north China, northwest China and northeast China) and southwest areas of China, due to the high concentration of installed generators, insufficient local consumption of electricity, imperfect transregional transmission mechanism and interprovincial protectionism, which has attracted high attentions from various sectors and government departments. This paper analyses the severe situation of renewable energy accommodation in the "Three North" and southwest areas of China and the necessity of promoting the use of renewable energy in the way of marketing, studies the transregional spot trading mechanism and method of surplus renewable energy, introduces the market operation performance and effectiveness, discusses the existing problems, and proposes relevant suggestions, which is of great significance in promoting the extensive accommodation of renewable energy in a large area and the construction of pilot electricity spot market in China.

Key words: renewable energy , electricity spot market, wind curtailment, solar curtailment, water curtailment, transregional electricity trading