Research press release


Nature Energy

Solar electricity now cheaper than grid electricity in China



今回J Yanたちは、中国の都市における太陽エネルギーシステムの総額と発電電力量を見積もり、都市レベルの送電網による供給電力の価格と比較した。さらに、グリッドスケールの太陽光発電の価格も見積もり、送電網によって供給される石炭火力発電の価格と比較した。その結果、中国の344都市全てで、産業用および商用の太陽光発電システムが、送電網による供給電力より低いコストで発電できることが見いだされた。こうした都市の22%では、グリッドスケールの太陽光発電システムについても、石炭より低い価格で電力を生産できる。

Electricity from industrial and commercial solar energy systems has become cheaper than grid-supplied electricity in Chinese cities, finds a study published online this week in Nature Energy. This finding presents an economic incentive that may encourage a substantial uptake of industrial and commercial solar systems in China in the near future.

When the price of solar electricity is higher than grid supply, the economic incentive to purchase solar energy systems can be reduced. Many developed countries subsidize solar energy systems to make up for the higher costs. Developing nations, such as China, may not offer significant subsidies, but lower labour and system hardware costs may mean that achieving parity with grid electricity prices is within reach.

Jinyue Yan and colleagues estimated total solar energy system prices and electricity output in Chinese cities and compared them to city-level grid electricity prices. They also estimated grid-scale solar electricity prices and compared those to coal generated grid electricity prices. The authors found that industrial and commercial solar photovoltaic systems are capable of generating electricity at lower costs than the grid supply in all 344 Chinese cities. In 22% of these cities, the grid solar electricity systems can also produce electricity at lower prices than coal.

doi: 10.1038/s41560-019-0441-z


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