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Scope 2 sources are indirect greenhouse gas emissions associated with purchased energy commodities including electricity and steam.
One this page:
Y = Q × EF/1000
Y is the scope 2 emissions measured in t.CO2-e
Q is the quantity of electricity (kWh)
EF is the scope 2 emission factor for Victoria (kg.CO2-e/kWh)
Where data was not available for the final months of 2017-18, estimations were made using daily consumption, calculated using data provided for previous months.
Data was not available for two air monitoring stations (AMS) which were unique solar instruments and powered by 100 per cent solar energy. Estimations were made using the capacity of the solar panels and average daily energy production of solar systems, as guided by the Australian Photovoltaic (PV) Institute. Average daily energy production from photovoltaic cells for Boroondara, Victoria was chosen due to geographical proximity to EPA's instruments.
Data was not available for a number of AMS. Estimations were made based on known consumption of similar AMS.
In the instance EPA is not the sole tenant of the building and 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.
Emissions associated with purchases of green power are zero.
Average daily production of solar solar systems : PV Performance by Climate Region (2018), Australian PV Institute
National Greenhouse Accounts (NGA) Factors conversion factors - Department of Environment
HTHW consumed at CES Macleod as provided by the plant operator - embodied energy expressed in gigajoules (GJ).
Natural gas consumption quantities supplied to the thermal cogeneration plant and hot water boiler as provided by the plant operator - expressed in gigajoules (GJ).
Proportion of energy content of natural gas converted to HTHW and losses and auxiliary services attributable to HTHW generation for cogeneration plant as identified in an energy audit conducted by the plant operator in 2003.
Proportion of energy content of natural gas converted to HTHW and losses and auxiliary services attributable to HTHW generation for hot water boiler as estimated by plant operator.
The preferred methodology is the efficiency method as described by the GHG Protocol guidance - Allocation of GHG Emissions from a Combined Heat and Power (CHP) Plant. Due to inadequate onsite metering, there is a lack of data that meant application of the efficiency method was not possible. The following method was developed in collaboration with the plant operator:
Y = Q × EF/1000
Q is the quantity of HTHW consumed by EPA’s Centre for Environmental Studies (CES) facility (GJ)
EF is the full cycle emission factor natural gas (kg.CO2-e/GJ).
Q = P x [(Nlt x Phthw) + (Nlt x Ploss x Hfrac)]
P is the proportion of HTHW consumed by EPA’s CES facility (%)
Nlt is the quantity of natural gas consumed by the co-generation plant at La Trobe University.
Phthw is the proportion of natural gas attributed to HTHW generation
Ploss is the proportion of natural gas attributed to system loses and auxiliary services
Hfrac is the fraction of system loses and auxiliary services attributed to HTHW
P = PCES/Nlt x Phthw
PCES is the quantity of HTHW consumed by EPA’s CES facility
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 the CES Macleod building, GHG emissions are apportioned using EPA’s NLA as a portion of the total NLA for the building.
On 20 December 2017, La Trobe's cogeneration plant was decommissioned. Since then, La Trobe has provided HTHW to CES Macleod via hot water boilers. Prior to 20 December 2017, La Trobe's hot water boilers supplemented HTHW supply from the cogeneration plant only in the cooler months or when the cogeneration plant was not operating. As such, prior to December 2017, we have assumed all HTHW provided by La Trobe to CES was produced by the cogeneration plant alone. From January onwards, we have assumed all HTHW was produced by the hot water boilers. For the month of December we have assumed 65 per cent was produced by the cogeneration plant and 35 per cent was produced by the hot water boilers based on the date of the switch.
The following are relevant for the cogeneration plant and were based on an energy audit of the cogeneration plant conducted by Sinclair Knight Merz:
The following are relevant for the hot water boilers and were based on estimates by the plant operator:
Proportion of energy content of natural gas attributable to losses and auxiliary services: 100 per cent
National Greenhouse Accounts Factors (July 2017) - Department of Environment and Energy
SKM (Sinclair Knight Merz), 2003. La Trobe University Cogeneration Plant Energy Audit, LTU Level 2, Final, October 2003
Page last updated on 9 Sep 2019