In FY16, Transurban’s total Scope 1 (fuel) and 2 (purchased electricity) emissions were 95,348 tonnes CO2-e (tCO2-e)3.
AirportLinkM7, which was acquired by Transurban in April 2016, has not been included in our FY16 total as it was not fully integrated into our HSE monitoring and reporting systems.
The trend in Transurban’s Scope 1 and 2 emissions is shown below.
Graph above shows only assets under Transurban financial control. Also excludes AirportLinkM7 (to be included from FY17).
3 The total Scope 1 and Scope 2 figure is 101,822 tCO2-e when non-controlled assets (M5 and M7) are included.
Transurban’s Scope 1 emissions arise from the combustion of fuel in vehicles and generators, and represent around 2 per cent of the total of Scope 1 and 2 emissions.
Scope 2 emissions from purchased electricity continue to be our largest source of emissions, accounting for around 98 per cent of our total emissions. As a result, electricity usage is a major focus of our energy and emission reduction efforts.
For more information about Transurban’s energy use please refer to the ‘10-in-10’ energy target section previous.
Our corporate Scope 3 emissions include the following sources:
These are not presented in the graph above due to lower control by Transurban and higher variability, particularly in waste quantities with construction and maintenance activity.
We also report on the estimated greenhouse gas emissions from customer vehicles travelling on our roads. These emissions are distinct from our corporate Scope 3 emissions since they are not directly related to our business operations.
In FY16, we estimate that vehicles on Transurban roads contributed approximately 1,231,750 tonnes CO2-e on assets under Transurban financial control4.
Vehicles travelling in free-flow traffic conditions generate less greenhouse emissions than those travelling in stop-start traffic due to improved fuel efficiency at cruising speeds. Transurban's roads have been designed and are operated to keep traffic flowing to help reduce congestion and improve travel times in comparison with alternative routes.
Transurban collects and analyses travel-time data from our toll roads as well as adjacent alternative routes operated by government. This includes roadside data captured by our systems directly and independent external data sourced from GPS and mapping data providers. This allows us to assess travel times and identify the travel time savings offered by our assets. Our analysis of travel time and fuel efficiency data confirm that using Transurban's routes in free-flow traffic situations produces less GHG emissions per kilometre than using an alternative route along arterial roads.
A recent environmental review completed in December 2015 for the M5 Southwest Widening project estimated the improvements in travel times achieved by the motorway upgrade reduced vehicle GHG emissions by between 30 to 40 per cent compared to an alternative route during peak hours. It also showed that improved driving conditions from the road widening had reduced vehicle emissions by a further 10 per cent. The full report can be found here.
4 The total customer emissions figure is 1,795,325 tonnes CO2-e when non-controlled assets (M5 and M7) are included.
Assets under construction and major upgrades managed by contractors are not included in Transurban’s corporate emissions as they are not under our operational control. Nonetheless, we aim to monitor energy use and GHG emissions for these projects.
Transurban’s major Australian project contractors are required to monitor and report on energy and GHG emissions, and track information about construction impacts via the requirement for major projects to be assessed using the Infrastructure Sustainability (IS) Rating Tool.
The IS rating tool includes performance credits for monitoring and reducing operational energy and GHG emissions, and life cycle energy and GHG emissions from the main materials used in road construction (i.e. asphalt, concrete and steel).
For more information about the IS Rating Tool and how Transurban applies it to projects refer to the Infrastructure Sustainability subsection of this report.
From FY15 onwards, Transurban has reported its greenhouse gas emissions under the Australian National Greenhouse and Energy Reporting (NGER) Act.
Under NGER legislation, Transurban is required to report the Scope 1 and 2 emissions of the facilities over which it has direct ‘operational control’. For FY16 our NGER reporting will include our Australian corporate offices, CityLink, M2, Lane Cove Tunnel, Eastern Distributor, Cross City Tunnel, Gateway Motorway, Logan Motorway, and the Go Between Bridge. This report will be submitted by the end of October 2016.
Our other Australian assets and construction projects where contractors or other entities have operational control are not included for the purposes of NGER legislation. Our USA assets are not subject to this Australian legislation.
Air quality is an important environmental measure for our roads. There are specific regulations in place for maintaining air quality within road tunnels and ensuring vehicle exhaust is appropriately diverted via tunnel ventilation systems. Transurban monitors, controls and reports on air quality to ensure conditions both on and near our road tunnels are maintained to a high quality that meets regulatory requirements.
Air quality and emissions measured by Transurban tunnels are reported in the Environment Data Sheet section of this report.
In an Australian-first, in FY16, we installed state-of-the-art technology in the ventilation outlet monitoring systems in our CityLink tunnels.
Our previous monitoring system required fortnightly maintenance during off-peak times when the tunnel was open. To address the risks associated with this activity - including potential traffic incidents - Transurban implemented a Fine Dust Analysis System which features a new, low-maintenance, light scattering technology. This new approach has reduced the frequency of routine maintenance to three-monthly - coinciding with scheduled tunnel closures, and also reduced associated cost and safety risk. Through installing this technology, we have been able to maintain our air quality monitoring requirements without any impact to service and realising annual savings of about $300,000.
As this initiative introduced new technology, Transurban was required to gain endorsement of the Victorian EPA and their independent auditor. The successful outcomes from a trial of the equipment saw the technology gain the EPA’s endorsement in late 2015, and was subsequently featured at the Clean Air Society of Australia and New Zealand’s Clean Air Conference.
This innovation is being considered for use on our other tunnels.