Water Journal : Water Journal November 2011
technical features 74 NOVEMBER 2011 water greenhouse emissions In response to climate change, Western Water aims to deliver value to customers through innovation and rigorous planning and management and through prudent investment and efficient operations. These obligations are central to the development and implementation of the Strategy, and are critical in justifying actions to both our customers and independent regulators. Future progress will depend on how well we work with Government, regulators, other stakeholders and the community. Without these stakeholders' involvement and support, mitigation and adaptation cannot be successful. Carbon Footprint Continued progress towards Western Water's aspirational target of Zero Net Scope 1 and 2 greenhouse gas emissions has been made. In 2004--05, Western Water produced more than 30,000 tonnes of carbon emissions, equivalent to pollution from 6,925 cars. In the past year, net greenhouse gas emissions were reduced to 21,621 tonnes, 29% below those of 2004--05. A slight increase in net emissions compared to 2009--10 was observed as a result of the revised calculation methodology for fugitive emissions consistent with the National Greenhouse and Energy Reporting Scheme. This resulted in an additional 2,084 tonnes of carbon emissions generated from the treatment of wastewater (Scope 1 emissions) from the previous methodology. Emissions generated from the consumption of grid electricity reduced by 10% or 1,511 tonnes of carbon emissions compared to 2009--10. This indicator suggested that the carbon emissions associated with our services are reducing, although the region is experiencing high population growth. Approximately 78% of greenhouse gas emissions are generated through the consumption of Victorian electricity grid power. The breakdown of Western Water's emissions sources for 2010--11 is provided in Table 2. Greenhouse gas emissions are classified into three defined categories -- Scope 1, 2 and 3. Scope 1 are direct emissions within organisational control. Scope 2 are indirect emissions from purchased energy, mainly electricity. Western Water currently reports on Scope 1 due to our essential activities and Scope 2 due to the use of electricity. Western Water continued to extend the scope of greenhouse gas reduction actions to consider ways of influencing Scope 3 activities, which are undertaken outside the organisation's boundary. Knowing where emissions are generated in our supply chain will allow Western Water to make strategic purchasing decisions that minimise our energy and carbon risk profile in the future. Progress against the Strategy is updated monthly as part of Western Water's Strategic Management Reporting tool, the Balanced Scorecard, and communicated publicly via the Annual Report. A copy of our Climate Change Strategy is also publicly available on our website at www.westernwater.com.au Climate Change Mitigation -- Reducing our Carbon Profile Western Water is tracking well against our aspirational target of Zero Net Carbon Emissions by 2017--18. Progress is being made towards a Milestone target of a 50% reduction by 2012--13 from a baseline year for which 30,434 tonnes of greenhouse gas emissions were reported. To guide action planning and investment decisions, Western Water has adopted a carbon management model which reflects the prioritisation of emissions reduction ahead of the purchase of offsets. This model reflects a continuous improvement process to ensure new practices and technologies are captured as they emerge over time. At Western Water, our emissions mitigation program was developed through a collaborative process and extends across the organisation. The program is overseen by our Environment Committee and draws on ideas generated by employees through the Green Ideas Program and Workshops. Reductions have been achieved through a range of initiatives including: • Energy efficiency audits and retrofits at depots and offices; • Improving pumping efficiencies along water and sewerage pipelines by converting to gravity systems; • Installation of energy-efficient blowers and aerators at our recycled water plants; • Development of a Green Travel Plan, which included the installation of biodiesel facilities to use as a substitute to diesel for use by outdoor fleet vehicles, among other activities; • Investing in renewable energy technologies such as cogeneration and solar power; • Embedding energy consumption and greenhouse gas emissions in decision- making processes; Table 1. Net Greenhouse Gas Emissions (tonnes CO2e) -- Five Years 2006/07 2007/08 2008/09 2009/10 2010/11 Total Net (Scope 1 and 2) Emissions (tonnes CO2e) 23,958 23,485 24,504 20,999 21,621 Population served 131,312 134,810 139,730 144,948 150,664 Drinking water consumption (ML) 11,601 10,730 10,719 10,592 10,251 Table 2. Greenhouse Gas Emissions by Source -- 2010/11. Direct Emissions (Scope 1) 6,723 Nitrous Oxide Emissions 3,052 Methane Emissions 2,966 Diesel Consumed 456 Unleaded Petrol Consumed 222 Gaseous Fuel Combustion 25 B20 Biodiesel 2 Indirect Emissions (Scope 2) 16,850 Vic Grid Electricity Consumed 17,745 Reduction from GreenPower Purchase (895) Offsets Purchased and Retired (1,952) Voluntary Carbon Units (1,952) Total Net Scope 1 and 2 Emissions (tonnes CO2e) 21,621 Western Water's Willimigongon Reservoir.
Water Journal December 2011
Water Journal September 2011