Water−Carbon Trade-off in China’s Coal Power IndustryClick to copy article linkArticle link copied!
Abstract

The energy sector is increasingly facing water scarcity constraints in many regions around the globe, especially in China, where the unprecedented large-scale construction of coal-fired thermal power plants is taking place in its extremely arid northwest regions. As a response to water scarcity, air-cooled coal power plants have experienced dramatic diffusion in China since the middle 2000s. By the end of 2012, air-cooled coal-fired thermal power plants in China amounted to 112 GW, making up 14% of China’s thermal power generation capacity. But the water conservation benefit of air-cooled units is achieved at the cost of lower thermal efficiency and consequently higher carbon emission intensity. We estimate that in 2012 the deployment of air-cooled units contributed an additional 24.3–31.9 million tonnes of CO2 emissions (equivalent to 0.7–1.0% of the total CO2 emissions by China’s electric power sector), while saving 832–942 million m3 of consumptive water use (about 60% of the total annual water use of Beijing) when compared to a scenario with water-cooled plants. Additional CO2 emissions from air-cooled plants largely offset the CO2 emissions reduction benefits from Chinese policies of retiring small and outdated coal plants. This water–carbon trade-off is poised to become even more significant by 2020, as air-cooled units are expected to grow by a factor of 2–260 GW, accounting for 22% of China’s total coal-fired power generation capacity.
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