**Data Statement**

We report on aggregated data from the CBT-based electricity trading platform of the YNEM. These data are reported in the figure in which they are shown, but original datasets are subject to commercial confidentiality requirements and are hence not publishable.

**Author Contributions:** Conceptualization, X.Y. and G.L.; methodology, X.Y. and C.C.; software, G.L. and X.Y.; validation, G.L., X.Y., Y.S., and R.C.; investigation, C.C. and Y.S.; writing—original draft preparation, X.Y.; writing—review and editing, C.C., G.L., and R.C.

**Funding:** This research was supported by the National Natural Science Foundation of China (No. 51879030).

**Acknowledgments:** The authors are very grateful to the anonymous reviewers and editors for their constructive comments.

**Conflicts of Interest:** The authors declare no conflicts of interest.
