Energy Efficiency
Energy efficiency has an important part to play in the solution to global climate change.
Alcoa and Alinta have partnered to create cogeneration power units at Alcoa refineries.   The plants produce both electricity and heat from the same fuel source, delivering greenhouse benefits.  Gas-fired cogeneration is the most thermally efficient and greenhouse-friendly non-renewable energy source.
There are currently two cogeneration units operating at the Pinjarra Refinery.  Cogeneration is around 75% energy efficient, compared with 30-50% for other power plants operating in WA.   A year’s electricity from each cogeneration unit saves around 450,000 tonnes of greenhouse gas emissions each year compared to a similar sized coal fired plant – equivalent to taking 112,000 cars off the road. In addition, the cogeneration plants reduce Alcoa’s refinery emissions by 270,000 tonnes per year through more efficient steam generation – equivalent to taking a further 67,000 cars off the road.
Two Open Cycle gas turbine power plants commenced operation at Wagerup in October 2007 to supply reserve capacity to the market and may be converted to cogeneration units to meet future Wagerup steam requirements.   Cogeneration plants at the Pinjarra and Wagerup refineries could save over 1.8 million tonnes of greenhouse gas emissions when compared to coal fired electricity generation.  This is equivalent to taking 450,000 cars off the road in Australia.

Media Release: 2004
Cogeneration project launched

Joint Media Release by Alcoa and Alinta Ltd: 2004
Second cogeneration unit at Pinjarra