Rotokawa Reservoir

• The Rotokawa geothermal reservoir is located approximately 15km north of Taupo, New Zealand and has been in operation since 1997. Up until January 2010, the reservoir had been exclusively supplying geothermal fluid to the 34MW binary plant facility at Rotokawa. The reservoir experienced little change in fluid chemistry or temperature over this operating period.
   
• Based on a resource area of 6.0 km2 and further reservoir modelling, an extra 45,000 tonnes/day take was proven and resource consent to take was granted. This additional fuel allowed for the construction of a 139MW triple flash power plant facility. The total consented take for the field to fuel the two power stations the (138MW Nga Awa Purua Power Station and the 34MW Rotokawa Power Station) is now 65,500 tonnes/day.
   
• Since the commissioning of Nga Awa Purua in April 2010, this has brought about a four-fold increase in geothermal fluid extraction and a corresponding injection volume increase.