science geothermal
DESCRIPTION
Kyla's PresentationTRANSCRIPT
New Zealand Geothermal Fields Atiamuri Horohoro Kawerau
Mangakino Mokai
Ngatamariki Ngawha
Ohaaki-Broadlands Orakeikorako
Rotokawa Rotoma Rotorua Tikitere
Tokaanu-Waihi Tongariro
Waimangu-Rotomahana Waiotapu
Wairakei-Tauhara
Mainly all these geothermal fields are in this circle.
Map
of G
eoth
erm
al F
ield
s in
the
Taupo
Vol
canic
Zon
e
Reservoir and Wells
Geothermal found that Ngawha began in the 1960s, including the first well. Sixteen other wells were drilled between 1977 and 1983 to depths ranging from 600 to 2300 m.
Thirteen of the wells were tested, of which six were good producers. As in 2011 there are 10 in use : Three for production, Five for inserting fluids ETC. and two others.
Where is Ngawha ?The Ngawha geothermal field is a geothermal area in the North Island of New Zealand. It is situated roughly 5 km east of Kaikohe and is centred around the village of Ngawha Springs. The field covers an area of around 25 km² and as such, is much smaller than the only other geothermal field in New Zealand, the Taupo Volcanic Zone.
Ngawha Generation Ltd Upstream Developer: Top Energy Ltd
Downstream Developer: Top Energy Ltd Operator: Ngawha Generation
Plant Type: Binary Principal supplier: Ormat
Flash pressure: 11/12 bara Steam flow: 85 t/h Brine flow: 950 t/h
Both the geothermal power stations at Ngawha are shown in the Pictures.
Station 1: built in 1998 Station 2: Built in 2008
Future Plans for t
he Ngawha Geothermal F
ield : Ngawha is
a large energy resource with a huge investment in unused production
wells. The relatively low heat content and the high levels of dissolved
minerals in the fluids and high gas content produced fro
m the wells
(more than would be produced from a gas-fire
d power station for the
same output) are drawbacks for electric
ity generation. Of greater
concern is the need to protect the surface features. A
fter appropriate
monitoring, likely to take about 5 years, careful th
ought will b
e given to
whether any further growth could happen. The potential fo
r industria
l
process heat and tourism has been investigated by a number of groups.
The field is regulated by Northland Regional C
ouncil.
New Zealand Geothermal Association
The bylaws of the NZGA published in September 2007
http://www.nzgeothermal.org.nz/nz_geo_fields.html#Ngawha
http://www.nrc.govt.nz/upload/2231/Chapter%20Ten%20-%20Ngawha.pdf
http://www.topenergy.co.nz/generation-ngawha-power.shtml
http://www.topenergy.co.nz/pdf/OfficialOpeningMRFINAL.pdf
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