C&I energy storage projects in China mainly profit from peak-valley arbitrage while reducing demand charges by monitoring the inverters’ power output in real time to prevent transformers of industrial parks from exceeding their capacity limits.
Since July, as the country experienced peak electricity demand, more and more provinces have varied electricity charges for different seasons, expanding the peak-to-valley spread and fostering growth in the C&I energy storage sector.
In the five cities of the Pearl River Delta of Guangdong, the peak price was RMB 1.49/kWh, and the trough price was RMB 0.289/kWh, meaning a peak-to-trough gap of RMB 1.2/kWh, making Guangdong the province of the largest peak-to-valley spread as of mid-2023.
As shown in the chart below, given a peak-to-valley spread as high as RMB 1.2/kWh, a C&I energy storage with one charge-discharge cycle a day in the five cities will need a payback period of eight to nine years. Provided the average spread is RMB 0.7/kWh, the project will not recoup investment within a decade.
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