EPA’s environmental performance

Scope 1 GHG emissions


Natural gas

Transport fuels – vehicle and boat fuel

Refrigerants – building, kitchen, laboratory, and vehicle refrigeration 

 

Natural gas – tenant
Activity data Natural gas consumption amounts stated on supplier invoices – expressed in gigajoules (GJ) 
Calculation method

formula for natural gas

X is the sum for all gas types of (Q times EFj  divided by 1000)

Where:

Xij is the scope 1 emissions measured in t.CO2-e

Q is the quantity of natural gas purchased (GJ)

EFj is the emission factor for each gas type (j) which includes the effect of an oxidation factor (kg.CO2-e/GJ)

Assumptions None
Reference

National Greenhouse Accounts (NGA) Factors conversion factors – Table 2 (Department of Environment and Energy)

Transport fuels – vehicle and boat fuel
Activity data Fuel consumption amounts by fuel type as stated on supplier transaction records – expressed in litres (L). Commonly used fuel types include gasoline, diesel and LPG.
Calculation method

transport fuels

X is the sum for all fuel types of (Qi times ECi times EFij divided by 1,000,000)

Where:

X is the scope 1 emissions measured in t.CO2-e

Qi is the quantity of fuel type (i) (L)

ECi is the energy content factor for fuel type (i) (GJ/kL)

EFij is the emission factor for each gas type (j), which includes the effect of an oxidation factor, for fuel type (i) (kg.CO2-e/GJ).

Assumptions EFij for blended fuels is calculated by combining the emission factors available for each fuel types included in the blended fuel. The ratio used to calculate EFij for blended fuels is the maximum standard specified for the fuel. For example, it is assumed E10 contains 10% ethanol and 90% gasoline.
Reference

National Greenhouse Accounts (NGA) Factors conversion factors – Table 4 (Department of Environment and Energy)

Refrigerants – building, kitchen, laboratory, and vehicle refrigeration
Activity data Manufacture specifications as stated on nameplate data on equipment. Information includes the refrigerant gas type and the charge capacity of the refrigeration system. 
Calculation method

Formula for refrigerants

X is the sum for all equipment of (Qi times LRi times Gij divided by 1,000)

Where:

X is the scope 1 emissions measured in t.CO2-e

Qi is the charge capacity for equipment (i) (kg).

LRi is the leakage rate for equipment (i) (% of capacity)

Gij is the global warming potential of the refrigerant gas (j) for equipment (i) (kg.CO2-e/kg)

Assumptions Where EPA is not the sole tenant GHG emissions are apportioned using EPA’s Net Lettable Area (NLA) as a portion of the total NLA for the building.
Reference

National Greenhouse Accounts (NGA) Factors conversion Factors – Table 27 (Department of Environment and Energy.)

Intergovernmental Panel on Climate Change (IPCC) 5th assessment Report - Global Warming Potentials for non- Kyoto gases – WGI Chapter 8, Table 8.A.1 and WGIII Annex II.9.1

 

Page last updated on 24 Aug 2017