Overview
Clicking 「排出量計算」 on the 「排出量」 screen calculates the chosen fiscal year's emissions for every property in the selected portfolio. Calculating the same fiscal year again replaces the previous result with the new one. The calculation uses the monthly energy data from April of that fiscal year to March of the following year. When you change energy data, running 「排出量計算」 again brings the change into the emissions.
Scope 1 and Scope 2
Scope 1 is the gas volume (m³) multiplied by the city-gas emission factor. Scope 2 (location-based) is the electricity (kWh) multiplied by the electricity emission factor of the region worked out from the property's address. Scope 2 (market-based) is Scope 2 (location-based) minus the purchased renewable electricity (kWh) multiplied by the same factor, and it never goes below 0. District heating (GJ) is not used in the emissions calculation. When fewer than 12 months have data, the total of those months is multiplied by 12 divided by the number of months with data, to scale it up to a full year. The total and the intensity on the 「排出量」 screen are worked out from Scope 1 and Scope 2 and do not include Scope 3. The intensity is the total multiplied by 1000 and divided by the gross floor area (m²), in kgCO₂/m².
Scope 3
When no value has been saved for the fiscal year on the property's 「Scope 3」 tab, Scope 3 is 15% of the sum of Scope 1 and Scope 2. When a value has been saved on the 「Scope 3」 tab, that fiscal year's 「合計 Scope 3」 is used. For a property-year with no month of data, 15% is used whatever the 「Scope 3」 tab holds.
The electricity emission-factor region
The prefecture is read from the property's address, and the factor of whichever of the 10 regions that prefecture belongs to is used. When no prefecture can be read from the address, 0.000441 tCO₂/kWh is used. The factor values are the same for every fiscal year. For the list of factors, see Emission factors and benchmarks.
Owner and tenant split
The average of each month's 「オーナー比率」 is applied to Scope 1 and Scope 2 to give the owner's share, and the rest is the tenant's share.
Confidence
「信頼度」 on a property's 「排出量」 tab depends on the number of months with data: 「高」 for 10 months or more, 「中」 for 6 to 9 months, and 「低」 for fewer. 「信頼度」 is not shown in the table on the 「排出量」 screen.
Estimate for property-years with no data
A property-year with no month of data is estimated by multiplying the per-use-type benchmarks (electricity and gas per 1 m² of gross floor area) by the gross floor area. For a building whose age (the fiscal year's end year minus 「築年」) is over 20 years, the estimated amounts are raised at a rate of 2% per 10 years beyond 20 years. This estimate gives an estimated ratio of 100%, the estimation method 「用途別原単位（GRESB禁止）」 and a 「信頼度」 of 「低」. If such a property-year exists, the GRESB workbook for that fiscal year cannot be exported.