New energy wind power and photovoltaic power generation have increased, and their proportion in social electricity consumption has increased. In 2021, the national photovoltaic power generation will be 325.9 billion kWh, a year-on-year increase of 25.1%; the national wind power generation will be 652.6 billion kWh, a year-on-year increase of 40.5%. The cumulative power generation of wind power and photovoltaics totaled 978.5 billion kWh, a year-on-year increase of 35.0%, accounting for 11.7% of the electricity consumption of the whole society, exceeding 10% for the first time.

But at the same time, the absolute amount of abandoned wind and photovoltaic power increased significantly. In 2021, the country will abandon 20.61 billion kWh of wind power and 6.78 billion kWh of photovoltaic power. The total amount of abandoned electricity was about 26.748 billion kWh, a year-on-year increase of about 22.7%. Provinces such as Tibet and Qinghai have high abandonment rates, with photovoltaic utilization rates of only 86.2% and 80.2%. In the future, as the power supply structure is tilted towards scenery, the amount of new energy power generation will increase sharply, and the amount of abandoned wind and photovoltaic power will maintain an upward trend in the future. The system solves the problem of curtailment.

On the power supply side, the energy storage system will be an important tool for peak shaving, peak shaving and valley filling, and become a "cleaner power porter". For a period of time in the future, my country's power supply structure will still be dominated by coal-fired power generation, and the "traditional + new energy" hybrid power generation mode will be parallel. When the power consumption is low, the coal-fired units can be adjusted flexibly, and the overall power generation can be reduced to the vicinity of the minimum output limit. However, if the power generation supply at this time is still higher than the power demand, the traditional energy side cannot be further adjusted, and the new energy side can only choose to abandon light and wind. After the energy storage system is added, flexible scheduling and interaction between source, network, load and storage become possible. During the peak hours of wind power and photovoltaic power generation, the energy storage system is "charged" to consume new energy power, effectively reducing the rate of light abandonment; when there is no wind and no light, the energy storage system is "discharged" to support the normal operation of the power system.

Energy storage is conducive to smoothing the output of renewable energy, reducing the curtailment of wind and solar power from new energy wind power and photovoltaics, and improving the grid-connected consumption level of new energy power. The "Guiding Opinions on Accelerating the Development of New Energy Storage" proposes to "vigorously promote the construction of power-side energy storage projects", deploy new energy power stations equipped with energy storage, ensure efficient consumption of new energy, and provide capacity support and a certain amount of power for the power system. Peak shaving capability.