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Table 1. The ACN and APN from the power industries of each area in 2010 and 2020. If the actual emission is more than the local emission, the grid area allows extra emission by taking in electricity for consumption. If the local emission is larger, it means that the grid area allows for emission in other areas owing to power output. The power systems in Tibet and Taiwan are not considered because of their weak connection. In addition, their generation capacity and electricity consumption are small compared with those in other areas. In 2020, both the amount and difference between APN and ACN in each area have increased during this decade. The difference between local and actual emission in the southern area did not change due to a weak connection with other areas' power systems.