The amount of CO2 produced by the use of electricity in this stage is calculated on the basis of the "electricity GHG-emission factor" established for individual countries. Because the power sources used in each country vary, there can be quite large differences in this emission factor.
由於此階段用電量產生的 CO2 是根據各國的「電力排放系數」而定，而各國因為發電模式不同，碳排的系數差異頗大。