Japan experienced an electricity crisis in the summer of 2011 because of the earthquake and tsunami. The government urged companies and households to reduce their peak-level electricity consumption by 15% of that in the previous summer. We conduct an ex-post evaluation on the electricity-saving efforts in the residential sector, by a questionnaire survey of 2,970 households. The result shows that 10% saving was achieved on average after the weather normalization adjustment. We elaborate the differences in the electricity conservation rate by household types. Moreover, the main conservation measures are analyzed by both the econometric-based method and the engineering-based method.
