Otahuhu Power Station
Encyclopedia
The Otahuhu power station site holds two plants; Otahuhu A (open cycle gas turbines, now synchronous compensation) and Otahuhu B (a 404 MW combined cycle). The station is owned and operated by Contact Energy
.
plant was commissioned in January 2000. This natural gas
fired plant comprises a Siemens
V94.3A(2) gas turbine
in single shaft configuration. The HRSG
is unfired triple pressure with reheat. Steam cycle cooling is by a hybrid wet - dry cooling tower
, using sea water makeup.
At commissioning, the plant capacity was 385 MW. In 2005, upgrades to plant components (including the gas turbine compressor) resulted in an increase of plant capacity to approximately 404 MW.
Contact Energy
Contact Energy Limited is a New Zealand electricity generator, natural gas wholesaler and electricity, natural gas, and LPG retailer.The company is the second-largest electricity generator in New Zealand , generating 24 percent of New Zealand's electricity in the year ending 31 December 2009, and...
.
Otahuhu A (OTG)
The first generating units at Otahuhu were open cycle gas turbine Stal-Laval units, commissioned in 1968. In 1978, a further two generating units were added, twin pack units using Rolls Royce Olympus gas turbines. Due to the age of these gas turbines, they have been retired from service. The generators remain in use in synchronous compensate duty, providing reactive power to the grid.Otahuhu B (OTC)
The combined cycleCombined cycle
In electric power generation a combined cycle is an assembly of heat engines that work in tandem off the same source of heat, converting it into mechanical energy, which in turn usually drives electrical generators...
plant was commissioned in January 2000. This natural gas
Natural gas
Natural gas is a naturally occurring gas mixture consisting primarily of methane, typically with 0–20% higher hydrocarbons . It is found associated with other hydrocarbon fuel, in coal beds, as methane clathrates, and is an important fuel source and a major feedstock for fertilizers.Most natural...
fired plant comprises a Siemens
Siemens
Siemens may refer toSiemens, a German family name carried by generations of telecommunications industrialists, including:* Werner von Siemens , inventor, founder of Siemens AG...
V94.3A(2) gas turbine
Gas turbine
A gas turbine, also called a combustion turbine, is a type of internal combustion engine. It has an upstream rotating compressor coupled to a downstream turbine, and a combustion chamber in-between....
in single shaft configuration. The HRSG
HRSG
A heat recovery steam generator or HRSG is an energy recovery heat exchanger that recovers heat from a hot gas stream. It produces steam that can be used in a process or used to drive a steam turbine.-General usage:...
is unfired triple pressure with reheat. Steam cycle cooling is by a hybrid wet - dry cooling tower
Cooling tower
Cooling towers are heat removal devices used to transfer process waste heat to the atmosphere. Cooling towers may either use the evaporation of water to remove process heat and cool the working fluid to near the wet-bulb air temperature or in the case of closed circuit dry cooling towers rely...
, using sea water makeup.
At commissioning, the plant capacity was 385 MW. In 2005, upgrades to plant components (including the gas turbine compressor) resulted in an increase of plant capacity to approximately 404 MW.