Plants, residential buildings, shopping malls, school buildings ... ... can be built everywhere photovoltaic roof power station? On August 20, Wu Xinxiong, director of the National Energy Administration, spoke bluntly at the photovoltaic industry forum in Nanjing, saying that building photovoltaic power plants on the rooftops should first consider investment benefits—the roof area must be large enough to ensure economies of scale; the electricity generated can be sold, To ensure revenue.
“According to the policy, photovoltaic power generation will be implemented on the spot and the rest of the electricity will be connected to the Internet. Provided that the regulations are met, the power supply company will be connected to the grid in a timely manner.†Yue Yaxin, Chief Technology Officer of Zhenghui Solar Power Co., Ltd., said that the roofs of residential buildings, commercial complexes, and factories are The surplus power of the power station is currently sold to the power grid at a price of 0.455 kWh. However, the commercial and industrial electricity prices for power grid sales are higher than the resident power price, and the same photovoltaic power is consumed. Commercial and industrial offset power prices are higher than residents, and the return on investment is more cost-effective. .
But it is not easy to find a suitable factory and build a photovoltaic power plant. Companies generally do not allow outsiders to enter, photovoltaic companies have to use stupid methods, using Baidu map to engage in "carpet-style" search, determine the roof area, orientation, to find out the roof may be suitable. Zhenghui Company has the largest number of rooftop power stations in our province. Last year, seven technicians were arranged to go online every day to find suitable roofs.
With a suitable roof, it is not easy to obtain consent from the owners. The domestic rooftop power station adopts a contract energy management model to pay for the investment cost of the power station with reduced energy costs. The roof power station contract period is generally 25 years. PV companies are paid 10% off the average industrial electricity price of the national grid and the factory settles. The power of the rooftop power station is 10% cheaper than the electricity purchased from the grid, but the actual operation is facing the lack of energy-saving power of the owners. . An equipment manufacturing company in Changzhou once cooperated with photovoltaic companies. The factory can have a roof area of ​​30,000 square meters, and can build 2 megawatts of photovoltaic power stations. According to the 10% electricity price discount, enterprises in the 25-year contract period can enjoy a revenue of 5 million yuan, but this Equipment manufacturing companies think that the benefits are too little to abandon cooperation.
Even if everything went smoothly, it would be a lot of trouble to put the panels on the roof. First of all, 1 square meter of panels and brackets weighs about 20 kg. Many factory buildings use colored steel structures. The roofs are not as load-bearing as concrete structures. The installation capacity per unit area is reduced, and installation and reinforcement fees are also required. Secondly, they must be installed at the factory. Electrical equipment, owners often worry about security issues.
To maximize the use of roof resources and build more photovoltaic power plants, more efforts are needed. Gu Yufang, director of the Provincial Power Supervision Office, suggested that the PV industry policy should strengthen top-level design, explore better business models, allow roof owners to have higher profits, strengthen departmental coordination, adapt to the needs of photovoltaic power plants, and optimize the construction or construction of buildings under construction. Roof design, improve the use of value. “In addition to the government granting certain price subsidies, more depends on the market mechanism to win sustainable development.†Gu Yufang believes that the use of photovoltaic power generation in factories can reduce carbon emissions in the entire society than thermal power generation using the power grid, and save carbon emissions in the market. Trade gains. Last year, a 30-megawatt power plant in Ningxia completed the first domestic PV power station carbon trading. The project annually reduces carbon dioxide emissions by 51,000 tons, adopts a transaction method linked to the transaction price of the EU market, and has a contract period of 10 years, which can yield 400,000 Euros per year.
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