EPA’s environmental performance

Scope 1 GHG emissions


Scope 1 emissions are those that occur from sources directly controlled by the organisation.

One this page:

 

Natural gas – tenant
Activity data

Background:

EPA sites which consume natural gas include Carlton, Centre for Environmental Sciences (CES) Macleod and South West Geelong. However, the site in Carlton does not use gas directly. As such, only activity data for base building natural gas is collected  for Carlton (see scope 3). Activity data for tenant natural gas is collected for CES Macleod and South West Geelong only.

Activity data:

Gas consumption amounts as stated on supplier invoices or provided directly from the property managers (expressed in gigajoules - GJ). As EPA is not the sole tenant for each of these sites, tenant natural gas data was collected separately from base building data.

Calculation method

X=Q×EF/1000

Where:

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

Q is the quantity of natural gas purchased (GJ)

EF is Scope 1 emission factor for natural gas distributed in a pipeline which includes the effect of an oxidation factor (kg.CO2-e/GJ)

Assumptions Where data was not available for the final months of 2017-18, estimations were made using average daily consumption, calculated using data provided for previous months. As EPA is not the sole tenant of these buildings, in the instance data was provided for the entire building or one floor of a building, GHG emissions were apportioned using EPA’s net lettable area (NLA) as a portion of the total NLA for the building or floor.
 Factors EF: 51.53 (kg.CO2-e/GJ)
Reference

National Greenhouse Accounts (NGA) Factors (July 2017), Department of Environment and Energy

  • Table 2: Emission factors for the consumption of natural gas (Victoria)
Transport fuels – vehicle and boat fuel
Activity data Fuel consumption amounts by fuel type, as stated on vehcile fuel card reports and boat fuel invoices - expressed in litres (L). Commonly used fuel types include gasoline, diesel and LPG.
Calculation method

 

X=∑(Qi×ECi× EFi/1000000)

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

ECi and EFi for blended fuels is calculated by combining the emission factors available for each of the fuel types included in the blended fuel. The ratio used to calculate ECi and EFij for blended fuels is the maximum standard specified for the fuel. For example, it is assumed E10 contains 10 per cent ethanol and 90 per cent gasoline while B20 contains 20 per cent diesel and 80 per cent biodiesel.

Vehicles were assumed to be post-2004.

Factors

ECi: ULP = 34.20, DSL = 38.60, LPG = 26.20, E10 = 33.12, B20 = 37.80, Jet = 36.80 and Oil = 39.70 (GJ/kL)

EFi: ULP = 69.70, DSL = 70.50, LPG = 61.50, E10 = 62.99, B20 = 56.92, Jet = 70.21 and Oil = 74.27 (kg.CO2-e/GJ)
Reference

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

  • Table 4
    • Boat fuel (general transport)
    • Vehicle fuel (Post-2004 vehicles)

Refrigerants – building, kitchen, laboratory, and vehicle refrigeration
Activity data Number and type of refrigerant containing assets sourced from internal audit. Refrigerant types and charge capacity - expressed in kilograms per year (kg/yr) sourced from manufacture specifications as stated on nameplate data on equipment.
Calculation method

X=∑(Qi×LRi× Gij/1000)

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) (percentage of capacity)

Gij is the 100-year global warming potential of the refrigerant gas (j) for equipment (i) (kg.CO2-e/kg)

Assumptions

In instances where EPA is not the sole tenant of a building, GHG emissions from relevant equipment (for example, air conditioning units) were apportioned using EPA's NLA as a portion of the total NLA for the building.

Applied light vehicle leakage rate for vehicles, stand-alone commercial application for small stand-alone freezers, medium and large commercial stand-alone freezers and chillers and domestic refrigeration for kitchen fridges and coolers.

Factors

LRi: vehicles = 15, commercial air-conditioning units = 9, commercial stand-alone freezers – small (<300L) = 7, commercial stand-alone freezers and chillers – large (>500L) = 12, kitchen fridges and water coolers = 3 (%)

Gij: R123 = 77.00, R141b = 713.00, R143a = 1,430.00, R22 = 1,810.00, R407c = 1,773.85, R410A = 2,087.50, R407b = 2,803.50, R404a = 3,921.60, R507A = 3,985.00, R502 = 4,657.00, R12 = 10,900.00, R600A = 3.00 (kg.CO2-e/kg)
Reference

Annual leakage rates for commercial air conditioning: National Greenhouse Accounts Factors (July 2017)   Department of Environment and Energy

  • Table 25 Leakage rates for synthetic gases.

Annual leakage rates for other: National Inventory Report 2016 (V1) Department of Environment and Energy

  •  Table 4.27: Halocarbons: key assumptions concerning average equipment life, initial and annual losses and replenishment rates, by equipment type

100 year Global Warming Potential: Industrial Gases (2018), The Linde Group

Page last updated on 9 Sep 2019