On August 14 and 15, 2020, rotating outages occurred in California power grid in the United States, affecting approximately 810, 000 people. The rotating outages is summarized and analyzed to provide reference for the safe and stable operation of China power grid. Firstly, the cutting load and rotating outage events caused by the extreme high temperature weather is introduced and the main causes of the rotating outages is summarized. Secondly, according to the actual situation of California power grid, the short-term and long-term countermeasures presented by the relevant institutions of California for this accident are given. Finally, combined with the problems exposed by the rotating outages, the enlightenment to China power grid is summarized from three aspects. Firstly, in the planning and operation of the power grid, more attention should be paid to the variation characteristics of net power load curve in the rapid development of new energy in the province. At the same time, a power planning mechanism that considers the influence of extreme situations should be established. Secondly, the power market construction should be optimized. Thirdly, the flexible control measures and capability of power grid should be improved.