Pg 16 Company overview Contact Energy Limited Annual Report 2007

Te Rapa – cogeneration (44 MW) Commissioned in 1999 the Te Rapa cogeneration plant is extremely efficient, using natural gas to generate steam and electricity for Fonterra’s Te Rapa factory, with surplus electricity being exported into the electricity system. Ohaaki – geothermal (105 MW) Commissioned in 1989, the Ohaaki Geothermal Power Station has been constrained to around 42 MW, due to reduced steam availability. This is expected to increase to around 60 MW as five new production wells are brought onstream. Wairakei – geothermal (157 MW + 15 MW binary plant) Commissioned in 1958, the Wairakei Geothermal Power Station has been providing New Zealand with renewable baseload electricity for nearly 50 years. Poihipi Road – geothermal (50 MW) Purchased by Contact in 2000, the Poihipi Road Geothermal Power Station is a modern and efficient power station. As of September 2006, the Poihipi Road station was connected to the Wairakei steam field and now draws the majority of its steam from there. New Plymouth – gas-fired steam turbine (330 MW) Commissioned in 1974, the New Plymouth Power Station was, at the time, the largest thermal power station in the country, with five units providing generation capacity of 500 MW. New Plymouth now operates three units and has the option of being able to run on fuel oil in certain circumstances. Taranaki Combined Cycle – combined-cycle gas turbine (377 MW) Commissioned in 1998 in the Taranaki town of Stratford, the Taranaki Combined Cycle Power Station (TCC) is a modern, efficient plant. Clyde – hydro (432 MW) Generating electricity from four large turbines, the Clyde Dam and Power Station in Central Otago is the largest concrete gravity dam in New Zealand. Roxburgh – hydro (320 MW) Commissioned in 1956, the Roxburgh Dam and Power Station was the first large-scale hydro dam on the Clutha River in Central Otago.

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