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City West Water

Energy management

Our goal is to protect the environment and minimise the impact of our services on the environment.

Why energy management is important

We use energy in the transportation and treatment of water and sewage, production of alternative water, and office administration. There is also a large amount of energy used for heating, moving and treating water in our customer's homes and businesses.

In providing our services we manage our energy use to reduce costs to customers and impacts to the environment. Energy usage closely relates to our greenhouse gas emissions, so efficient management is essential in ensuring we play our part in mitigating climate change impacts.

Measure: Track energy use throughout using our Greenhouse Gas Inventory
Assess: Monitor progress through our energy steering group
Set Objectives: Identify cost effective efficiency opportunities and associated targets (using Cost of Carbon Abatement Tool)
Switch: Renewable energy
for relevant alternative water supplies
Avoid: Minimise energy use during detailed design phase of projects. Seek low energy recovery in the development of infrastructure options, guided by our Integrated Water Management Strategy
Reduce: Assess and implement
efficiency opportunities using the
Cost of Carbon abatement Tool
We have assessed the cost of carbon abatement initiatives using the Cost of Carbon Abatement tool provided by the Water Services Association of Australia. Reducing our electricity use also helps us save money. Renewable energy complements integrated water management initiatives by minimising carbon emissions. This is achieved by utilising renewable energy where a legislative requirement or cost effective opportunity exists.

What we are doing about it

Management of energy is addressed through our Energy Strategy which considers current and future energy requirements. The Strategy follows the Environment Protection Authority’s Carbon Management Hierarchy and includes the following key elements:

2015/16 CWW Greenhouse Gas Emissions (Scope 1 and 2 tCO2-equivalent)

Our 2015-2016 tonnes of CO2-e of greenhouse emissions Percentage
Altona Wastewater Treatment Plant (Biological) 4595 32.59%
Altona Recycling Plant (Salt Reduction) 4455 31.60%
Pumping (incl Sewer,Recycled and Potable) 2113 14.99%
Head Office and Depots (Footscray, Brooklyn and West Melb) 1245 8.83%
CWW fleet 333 4.32%
Contractor Vehicle Fleet (Maintenance) 421 2.99%
Wyndham West Recycling Plant (Salt Reduction) 333 2.36%
Sunshine Sewer Mine 261 1.85%
Stormwater Harvesting 42 0.30%
Other 25 0.18%

*-CWW’s Altona Treatment Plant has a 6kW solar panel system generating renewable energy. This prevented 10 tonnes of carbon dioxide equivalent emissions going into the atmosphere. This equates to 0.07% of CWW’s total greenhouse gas emission footprint.

Our Energy Management Actions and Programs


Renewable energy incorporated as a component of Integrated Water Management initiative
Continue to assist customers with energy efficiency through relevant partnerships
Continuously review out efficiency opportunities (using the cost of carbon abatement tool)
Improve management of energy through active controls by installing a new SCADA system
Improve pumping efficiency through real time water demand forecasting (MABAL)
Move to an office building that will halve our energy use
How you can track our performance Our targets for energy use are to assess and implement cost effective energy efficiency projects. The effectiveness of these targets in managing our corporate emissions is shown in the following graph:
Year Our Electricity Use (kWh/yr)
2010/11 6,908,732
2011/12 8,691,584
2012/13 8,597,406
2013/14 6,789,043
2014/15 7,127,241
2015/16 10,562,702

Altona Salt Reduction Plant recommenced operations in 2015.
Note: GHG Emissions for 10-11 were fully offset using carbon offsets. GHG Emissions for 11-12 were fully offset using renewable energy and carbon offsets. Emissions for 12-13 and 13-14 were partially offset using combination of renewable energy certificates and carbon offsets.

Where to go for more information

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