Little is known of workers' comfort and productivity under special conditions, particularly after large disasters. The Great East Japan Earthquake in 2011 caused enormous damage, leading to a 15% peak-power reduction to address power shortages. We investigated occupants' comfort and productivity in five office buildings in Tokyo during the summer season under mandatory electricity savings implemented after the earthquake. We changed the temperature, illumination and ventilation rate settings to investigate their effects on thermal comfort, productivity and energy levels. Occupants were more receptive towards decreased illumination than increased temperature. Awareness of power savings was increased, with more than 90% of people accepting the poor indoor environment in the light of recent events. Set-point temperature and clothing recommendations made by the Super Cool Biz campaign were followed in most offices. However, self-estimated productivity was 6.6% lower than the previous summer. Thus, electricity-saving strategies that do not affect productivity are required.

The Great East Japan Earthquake and Tsunami which occurred on March 11, 2011 caused widespread damage and electricity shortage. So the Japanese government has directed large-scale electricity users to curb their consumption by 15 percent of what they used last summer. However, excessive saving electricity forces office workers to be patient, and it can lead to productivity decline. In this study, the field survey and questionnaire survey were conducted in six buildings saving on electricity to study the indoor environment, the workers' productivity and energy conservation. As a result, it was found that the rise of temperature leads to the sharp decline of productivity and comfort, and that power saving of lighting made less dissatisfaction for office workers and reduced more electric energy than turning up the air conditioning. Office workers can keep productivity if there are no dissatisfactions for them. Therefore, lowering illuminance is found to be more effective for saving electricity than turning up the air conditioning.

The Great East Japan Earthquake on March 11, 2011 caused widespread damage, especially electricity shortage. Therefore the Japanese government has directed large-scale electricity users to curb their consumption by 15 percent of what they used in the previous summer. Most companies in Tokyo were saving electricity by reducing their use of lights and air conditioning systems in their offices. decline. Few field investigations have been conducted under special conditions including after big disasters. Purpose of this study is to find efficient strategies for saving electricity that do not decrease workers' productivity so much. In this report, energy consumption of existing building have analyzed and prepared between before the great east Japan earthquake and after. Further, it experimented on the conditions which changed an illumination setup and an airconditioning setup under power-saving environment, and conducted the sensitivity analysis of each item in analyzing the power consumption on each condition.