December 24, 2013
Electric Power Consumption by Office Tenants (September 2013)
Energy saving in summer has been well established in Japan’s offices, recorded the consumption level over 10% lower than before the earthquake for three years in a row.
Xymax Real Estate Institute has been studying the electric power consumption by tenants occupying office buildings in Japan and releasing the results on regular basis since June 2013. This is an update report on the electric power consumption up to September 2013 and comparison with the period before the Great East Japan Earthquake.
Definition of Electric Power Consumption by Office Tenants
The electric power per tsubo (3.3 sqm) consumed by tenants in office buildings in one month.
The areas covered by Tokyo Electric Power Company (TEPCO)
Electricity consumed by office tenants was 43.8 kWh/tsubo in summer 2013 (July-September), recorded the consumption level over 10% lower than before the earthquake for three years in a row.
42.0 kWh/tsubo (down 16.5% from 2010)
42.8 kWh/tsubo (down 14.9% from 2010)
43.8 kWh/tsubo (down 12.9% from 2010)
January 2010 – September 2013 (monthly data)
Of the office-use tenants occupying the office buildings in Japan under management by Xymax Group, the valid data (roughly 300 buildings, 3,000 tenants) was used as the sample data for this study.
1) Calculate the monthly electric power consumption in kilowatt-hour (kWh) by tenant.
2) Adjust the outcome in 1) based on the ordinary business days of the week (Monday-Friday).
3) Calculate the electric power consumption per tsubo (approx. 3.3 sq m) by dividing the outcome in 2)
by the rentable area of the tenant space. 4) Average the outcome in 3) by the areas covered by each electric power company.
・ Uses other than office use, such as retail, warehouse, and computer room are excluded from the subject data.
・ Tenants in buildings with central air conditioning or gas heat pump where separate calculation of the energy use by tenant is impossible are excluded from the subject data.
・ The month represents the month the electric power meter is read, usually on 20th of each month.
・ Extraordinary amounts (too high, too low) are identified as outlier and excluded from the subject data.
・ The number of subject tenants varies every month as tenants move in and out.