The reporter learned from the National Energy Administration that in 2018, the total installed capacity of wind, light, water and nuclear clean power reached 749 million kilowatts, and the total power generation totaled 2.08 trillion kWh, of which wind power utilization rate reached 92.8%. The wind rate was 7.2%, down 4.9 percentage points year-on-year; the photovoltaic utilization rate was 97%, the light rejection rate was 3%, down 2.8 percentage points year-on-year; the water energy utilization rate was over 95%; the nuclear power operation was stable and the utilization rate remained high. Overall, the situation of clean energy consumption has continued to improve, and has reached the international advanced level (90% utilization rate of wind power and 95% utilization rate of photovoltaic power generation).
Clean energy consumption is a systemic issue involving power, grid and power loads. According to the relevant person in charge of the Power Department of the National Energy Administration, the current clean energy consumption in China mainly faces the following difficulties: First, the reverse distribution of resources and demand, and greater voltage transmission across provinces; second, the rapid development of clean energy and electricity consumption in recent years. The growth rate is not matched. In recent years, the installed capacity of clean energy, especially wind power and photovoltaic power generation, has maintained a relatively fast growth rate, far exceeding the growth rate of electricity consumption in the whole society. The supply and demand mismatch has caused a large pressure of consumption; the output of wind power and photovoltaic power generation is affected by natural conditions, and there is relatively large volatility. After large-scale grid connection, it will bring greater challenges to the dispatching operation of the power system. At present,China's power system is not fully adapted to the access of such large-scale volatility new energy.
According to the "Clean Energy Absorption Action Plan (2018-2020)" (hereinafter referred to as the "Action Plan") issued in the past, in 2020, we will ensure that the national average wind power utilization rate reaches the international advanced level (to strive to reach about 95%), and abandon the wind. The rate is controlled at a reasonable level (strive to control at around 5%); the utilization rate of photovoltaic power generation is higher than 95%, and the light rejection rate is lower than 5%. The national water energy utilization rate is over 95%. National nuclear power has achieved safety and security.
The "Action Plan" puts forward the concept of "utilization rate". What is the difference between the commonly used abandonment rate and the light rejection rate? The relevant person in charge of the Power Department of the National Energy Administration explained that for a long time,China's clean energy development has always been based on the level of “disposal of electricity”, but the term “disposal of electricity” and “disposal rate” only focuses on the unused part of clean energy. Ignore the efforts and costs of the entire energy and power system to eliminate clean energy, which is easy to cause misunderstandings from all walks of life.
"From the perspective of the entire energy system economy and the cost of electricity consumption in the whole society, combined with the characteristics of the power system itself, there is an economic and reasonable utilization range for clean energy consumption. One-sided pursuit of 100% consumption will greatly increase the standby cost of the system. Restricting the scale of new energy that the power system can carry, but restricting the development of new energy, so it is not 100% complete consumption," said the responsible person of the National Energy Administration's power department.