The production restriction activities during major urban events in China have a drastic impact on regional electricity consumption. Identifying the fluctuations in electricity consumption that may be caused by related activities in advance can provide a possibility for regional power supply providers to optimize their management decisions in advance. This study uses the input-output method based on the input-output table data of Fujian Province and Xiamen City. Taking the 2017 BRICS Conference as an example, it forecasts the changes in electricity consumption caused by regional macroeconomic policies in Xiamen and Fujian before and after the meeting, and the forecast results are compared with actual fluctuations before and after the activity. The comparison results show that the results of the change forecasting analysis based on input-output analysis can accurately reflect the regional shortterm power fluctuations to a certain extent, but the data hysteresis can impact the accuracy of the study.