Media Release - Victorian Premier officially opens Mortlake Power Station

5 December 2012

Origin Energy Limited (Origin) and the Premier of Victoria, Ted Baillieu, together with the Minister for Energy and Resources, The Hon Michael O'Brien, today officially opened the company's 550 MW Mortlake Power Station, which is already playing an important role in meeting electricity demand in eastern Australia.

Mortlake is the largest gas-fired power station in Victoria and represents an investment of $810 million1 by Origin, including the associated gas pipeline. The peaking power station, which typically supplies electricity during periods of high demand, is located 12km west of Mortlake in western Victoria, approximately 220km west of Melbourne.

Mortlake is powered by natural gas from Victoria's Otway Basin located in Bass Strait. The gas is then piped to Origin's Otway gas processing plant at Waare near Port Campbell and connected to Mortlake via an 83km dedicated underground pipeline.

Origin Managing Director, Mr Grant King said, "The Mortlake Power Station represents a considerable investment by Origin in Victoria and adds to the Company's significant presence in the state. This includes Origin's position as Victoria's largest energy retailer servicing 1.1 million customers and operator of the Otway and BassGas gas facilities.

"Mortlake Power Station is active demonstration of Origin's integrated strategy, whereby the energy demands of our customers are supported by our large and flexible portfolio of power stations, many of which are fuelled by the Company's natural gas resources," Mr King said.

Mortlake Power Station is a highly efficient open cycle power station which will help guarantee electricity supply reliability for Victorians at the times of greatest need. During these periods, Mortlake has the ability to immediately respond it can be switched on and commence generating electricity within approximately five minutes.

Origin Chief Executive Officer Energy Markets, Mr Frank Calabria said, "Origin is Australia's largest power generator, and completion of the Mortlake Power Station strengthens and adds further flexibility to the Company's 5,900 MW power generation portfolio.

"Mortlake is the largest gas-fired power station in Victoria, with capacity to supply the equivalent of peak power to 250,000 homes2.

"The development of the Mortlake Power Station created hundreds of jobs in south-western Victoria, and will support a number of ongoing jobs in the local community," Mr Calabria said.

The Mortlake Power Station has been designed to provide flexibility to respond to future market conditions. The site has approval to expand its current capacity in the future, and could be converted to a highly efficient, low carbon emissions, combined-cycle baseload plant if market conditions warrant it.

1 Excluding capitalised interest.
2 Origin calculation based on typical Victorian household consumption of 6 MWh per annum at a load factor of 35% and peak demand of 2 kW.

For further information please contact:

Media
Anneliis Allen
Senior External Affairs Manager
Ph: +61 2 8345 5119
Mobile: +61 428 967 166

Investors
Kylie Springall
Group Manager, Investor Relations
Ph: +61 2 8345 5288
Mobile: +61 400 477 393

About Origin Energy
Origin Energy (ASX: ORG) is the leading Australian integrated energy company focused on gas and oil exploration and production, power generation and energy retailing. A member of the S&P/ASX 20 Index, the company has more than 5,900 employees and is a leading producer of gas in eastern Australia. Origin is Australia's largest energy retailer servicing 4.4 million electricity, natural gas and LPG customer accounts and has the country's largest and one of the most flexible generation portfolios with approximately 5,900 MW of capacity, through either owned generation or contracted rights. Origin's strategic positioning and portfolio of assets provide flexibility, stability and significant opportunities for growth across the energy industry. Through Australia Pacific LNG, its incorporated joint venture with ConocoPhillips and Sinopec, Origin is developing one of Australia's largest CSG to LNG projects based on Australia's largest 2P CSG reserves base.

In New Zealand, Origin is the major shareholder in Contact Energy, the country's leading integrated energy company, operating geothermal, thermal and hydro generation facilities and servicing electricity, gas and LPG customers across both the North and South islands. Origin also operates several oil and gas projects in New Zealand and is one of the largest holders of petroleum exploration acreage in the country.

Origin has a strong focus on ensuring the sustainability of its operations, is the largest green energy retailer in Australia and has significant investments in renewable energy technologies.

For more information go to www.originenergy.com.au.