Développement des énergies renouvelables: le photovoltaïque sera la principale source d’énergie du nouveau système électrique

After the "double control of energy consumption" in 2021 and the power rationing and shutdown in 2022, the power rationing news came out again in Yunnan, China's major hydropower province. This is also the third round of large-scale power rationing in Yunnan after the two rounds of power rationing in September 2022. Let's explore why this happens.

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Reasons for power limitation:

At the beginning of 2023, power rationing in Yunnan was increased again, mainly because the incoming water was less than expected.Due to the low rainfall in the second half of 2022, the water level of hydropower stations in Yunnan Province is generally low. However, it is worth noting that among the top ten hydropower stations in China, there are seven in Yunnan.Last year, due to the high temperature in summer, the national electricity consumption was high, and the water level of many reservoirs dropped rapidly. Since then, the water level of the reservoir has not been well replenished. Because of the large proportion of hydropower generation, the overall power supply in Yunnan Province is tight and the gap between power supply and demand is large.

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Impact of power restriction:

• Capacity of production is limited

Affected by the reduction of water inflow, the constant news of power rationing in Yunnan has significantly affected the industrial capacity represented by electrolytic aluminum. An employee of a Chinese enterprise interviewed by the Securities Times • e Company: "Since the power limit in September 2022, the first round of voltage limit has reduced the capacity by 10%, the second round has reached 20%, and the new round has reduced the capacity again by 40%."

• The market price is temporarily stable

In 2022, the power rationing tide in many places in southwest China once reduced the supply of products including aluminum and industrial silicon. However, the expectation of supply reduction caused by power rationing in Yunnan has not been significantly reflected in the price of related products. As a traditional power generation method, hydropower stations will be affected by various factors, among which the water volume is the most vulnerable. So we should consider whether there are other power generation methods that can replace hydropower stations.

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Classification of energy:

At present, the mainstream energy used mainly includes coal, oil and natural gas. Solar energy, geothermal energy, wind energy, marine energy, biomass energy and nuclear energy are new types of energy.

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Disadvantages of traditional energy:

First, it will emit carbon dioxide when it is used, and second, the price of traditional energy will rise sharply due to external factors such as politics, mining and transportation; Therefore, the best way to develop energy is to vigorously develop new energy.

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Analysis of new energy:

Wind power, nuclear power and solar power generation account for the highest proportion of new energy generation in China, second only to thermal power and hydropower in total.

• Wind power generation:

Use wind power to generate electricity. The wind energy facilities are becoming more and more advanced, and most of them are non-three-dimensional facilities, which can protect the land and ecology. However, wind power generation is not yet mature, the wind speed is unstable, and the amount of energy generated is also unstable.

• Nuclear power generation:

Power is generated by the thermal energy released by nuclear fission in the nuclear reactor. Compared with fossil fuels, it will not emit huge amounts of pollutants, cause no air pollution and aggravate the greenhouse effect. However, it will cause serious radiation pollution. If it is not handled properly, it will cause great harm to the environment and human body.

• Solar power:

We are not unfamiliar with the concept of solar energy. In simple terms, it is to convert the sun's rays into usable electrical energy. Solar energy is not only renewable, but also safe, clean and cheap. It is the first choice of renewable energy.

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Advantages of solar power generation:

(1) Photovoltaic power generation has economic advantages.

With the development of science and technology and the breakthrough of human development and utilization of solar energy technology, the economy of solar energy utilization will become more obvious. If the 20th century is the century of oil, then the 21st century is the century of renewable energy (the century of solar energy).

(2) Solar energy is inexhaustible renewable energy.

According to the calculation, the life of the sun is at least 4 billion years. Compared with human history, the time that solar energy can continuously supply the earth can be said to be infinite, which determines that the development and utilization of solar energy will be the most effective way to solve the shortage and depletion of conventional energy.

(3) No pollution to the environment.

Like wind energy, tidal energy and other clean energy, solar energy hardly produces any pollution when it is developed and utilized. In addition, its unlimited reserves make it an ideal alternative energy for mankind.Large enterprise workshops, supermarket chains and private enterprises all have advantageous roof resources. Most of these enterprises are large consumers of electricity. If the energy on the roof is reasonably utilized, it will be a huge potential wealth.For factories with large power consumption, installing photovoltaic power generation on the roof can effectively activate fixed assets, save peak electricity costs, obtain good electricity revenue, reduce the internal temperature of the factory, and promote energy conservation and emission reduction.

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[Disclaimer]

1. Some of the pictures and materials used in the article are from the network and are deleted in infringement.

2. The text and pictures are for readers' reference only. Please refer to the actual situation.