New Research

Electric Power Consumption by Office Tenants (June 2013)

Consumption in spring, reduced by 15% from the pre-quake level
(the areas covered by TEPCO)

Xymax Real Estate Institute has been continuously studying the electric power consumption by tenants occupying office buildings in Japan. Our study results for January 2010–April 2013 were released in June 2013 ( This report is an update on the previous report, covering data up to June 2013. The monthly data (January 2010–June 2013) is available at the end of this report.

Definition of Electric Power Consumption by Office Tenants

The electric power per tsubo (3.3 sq m) consumed by tenants in office buildings in one month.

Key Findings

the areas covered by Tokyo Electric Power Company (TEPCO)

The electric power consumption in spring (April-June) was reduced by over 15%
from that in the pre-quake period.

 41.9 kWh/tsubo
 34.3 kWh/tsubo (down 18.1% from 2010)
 34.7 kWh/tsubo (down 17.2% from 2010)
 34.8 kWh/tsubo (down 16.9% from 2010)



January 2010 – June 2013 (monthly data)

Subject 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.

Calculation Method

  1. 1) Calculate the monthly electric power consumption in kilowatt-hour (kWh) by tenant.
  2. 2) Adjust the outcome in 1) based on the ordinary business days of the week (Monday-Friday).
  3. 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. 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.
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