National Calculation Methodology (NCM) - Scottish Government

55. If in a certain space in the actual building, the service strategy includes mechanical
cooling, an improvement factor of 0.9 is applied when calculating the cooling load
for the corresponding space in the notional building. It is intended that this
reduction in the emissions arising from the cooling component of the notional
building will encourage the use of passive and low carbon cooling solutions.
56. If in a certain space in the actual building, the heating fuel is grid-supplied
electricity (whose CO2 emission factor increased from 0.422 kgCO2/kWh in 2007
to 0.517 kgCO2/kWh in 2010), the heating load of the corresponding space in the
notional building is adjusted by a factor which maintains the 2007 relationship of
grid electricity to the gas/oil baselines. The adjustment factors increase the
notional building’s CO2 emissions for heating, and consequently the TER, as
described below:
a. If the notional building’s heating fuel is determined to be natural gas, whose
CO2 emission factor increased from 0.194 kgCO2/kWh in 2007 to 0.198
kgCO2/kWh in 2010, the heating load in the notional building is multiplied by a
factor of 1.2. This factor has been calculated using:
(0.194x0.517)/(0.198x0.422)=1.2
b. If the notional building’s heating fuel is determined to be oil, whose CO2
emission factor increased from 0.265 kgCO2/kWh in 2007 to 0.297 kgCO2/kWh
in 2010, the heating load in the notional building is multiplied by a factor of
1.09. This factor has been calculated using:
(0.265x0.517)/(0.297x0.422)=1.09
57. Emissions calculations for both the actual and notional buildings must use the CO2
emission factors shown in Table 6.
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