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8/7/2019 Tauhara II - ELT Presentation 27July10
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28 July 2010
Tauhara II Geothermal Development ProjectPresentation to Enterprise Lake TaupoCraig Stephenson Environment and Land Manager
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Contact Energy Limited
Content
Contact who we are
How geothermal worksTauhara II project
28 July 2010 Tauhara II 2
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Contact Energy Limited
Contact who we are
Contact is New Zealands largest private electricity operator we are not ownedby the Government
We are owned by: Origin Energy (Australia) 51% 80,000 individual New Zealand shareholders; more New Zealanders have shares
in Contact than in any other company.Some of our leaders (most of them New Zealanders):
Whaimutu Dewes Director David Baldwin Managing Director Graham Cockroft Chief Operating Officer
James Kilty Project Director, Renewables Ulrich Biesenbach, GM - Geothermal
We directly employ over 1000 people throughout New Zealand
28 July 2010 Tauhara II 3
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Contact Energy Limited
Our values guide our behaviour the way we treat each other andour stakeholders First - being an intelligent and responsible leader Fresh - we dare to be different
United - working together to a common goal Open - building open and enduring relationships
Be the neighbour you want
We are passionate about our role in securing a sustainable future for New Zealand
28 July 2010 Tauhara II 4
Contact our values
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Contact Energy Limited 27 July 2010 Tauhara II 5
A quick overview of Contacts operations
5
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Contact Energy Limited 27 July 2010 Maximising the Benefits of Geothermal Development 66
The security of supply benefits
Geothermal is critical to ensuring New Zealands security of supply; both meetingdemand growth and facilitating the retirement of old thermal plant
Vital in replacing the 1,000 megawatts of coal-fired generation at Huntly withrenewable, baseload energy
NZ Electricity Supply Mean Demand Profile
0
1,000
2,000
3,000
4,000
5,000
6,000
7,000
8,000
2 0 0 9
2 0 1 0
2 0 1 1
2 0 1 2
2 0 1 3
2 0 1 4
2 0 1 5
2 0 1 6
2 0 1 7
2 0 1 8
2 0 1 9
2 0 2 0
2 0 2 1
2 0 2 2
2 0 2 3
2 0 2 4
2 0 2 5
M W
Geothermal Hydro Gas Coal Wind New Generation Demand
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Contact Energy Limited 27 July 2010 Tauhara II 77
Geothermal is New Zealands most cost effective fuel type
Entry Limit Price
0204060
80100120140160
180
C C G
T a t
$ 7 . 1 0 / G J
G a s
C C G T a t
$ 1 5 / G J
G a s
C o a l
@
$ 5 . 3 0 / G J
W
i n d
R a n g e
H y d r o
R a n g e
G e o
t h e r m a l
R a n g e
$ / M W h
Base Range $25/t Carbon $50/t Carbon
Source: Contact
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Contact Energy Limited 27 July 2010 Tauhara II 88
Contacts operations and projects an overview
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Contact Energy Limited 28 July 2010 Tauhara II 9
How Geothermal Works
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Contact Energy Limited
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Contact Energy Limited
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Contact Energy Limited
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Contact Energy Limited
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Typical Wellpad
WellheadsBranch LineFlash Tankor Silencer
Cross Country Line Separator Station
14
Sump
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Contact Energy Limited
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Contact Energy Limited 28 July 2010 Tauhara II 16
Tauhara II Project Overview
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Contact Energy Limited
TAUHARA II: The Project and the Resource
The project comprises; 250 MW Power station Steamfield Transmission
connectionLocated on the Wairakei-Tauhara GeothermalSystem (magenta line)Consent application areais shown by the lighterblue line
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Contact Energy Limited 18
Proposed Development Layout
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Contact Energy Limited 28 July, 2010 23
Tauhara Geothermal Resource
Tauhara field area Resource
Size Sustainability Effects and adaptive management
The Tauhara II project is sustainable modelled out to 2060.
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Contact Energy Limited 28 July, 2010 24
Tauhara is a large geothermal field
Tauhara - 50 km 2
Twice the area of Wairakei or
Rotokawa Wairakei 25 km 2
Rotokawa 20 km 2
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Contact Energy Limited 28 July, 2010 26
New Geological Information - Drilling
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Contact Energy Limited 28 July, 2010 27
Underground Resource Production and discharge strategies
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Contact Energy Limited
Subsidence
Intensive research project conducted over last four years Drilling, cores, physical testing, modelling
Better understanding of subsidence mechanisms and how to avoid. The avoidance of subsidence effects is the primary requirement for
Contact in managing the Tauhara Geothermal Field. Extensive subsidence monitoring. Pressure monitoring in geothermal field.
28 July, 2010 28
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Contact Energy Limited
Subsidence Damage Remediation
28 July, 2010 29
The ambulance at thebottom of the cliff is a
subsidence damageremediationrequirement inContacts consents all
property damage withindefined subsidencebowls is Contactsresponsibility to fix.
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Contact Energy Limited 28 July 2010 Document title 30
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Contact Energy Limited
Questions?
28 July 2010 Document title 31
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Contact Energy Limited
Extra slides if needed
28 July 2010 Document title 32
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Contact Energy Limited 28 July, 2010 33
Well Drilling covering much greater
Aerial Extent Depth
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Contact Energy Limited
Shallow Materials Properties
Extensive coring and materialstesting has been conducted over
the last three years
Professor Mick Pender fromAuckland University constructedspecialist testing equipment
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Contact Energy Limited
Models Developed
28 July, 2010 35
3D Reservoir Simulation
Wairakei model developed
Subsidence Models 3D coupled to reservoir simulator
1D concept confirmation
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Contact Energy Limited
Sustainability of the resource
1. Multiple model scenarios have been run out to 20602. Long term sustained performance from the resource can be achieved
beyond 20603. Best achieved including development in South Tauhara
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Contact Energy Limited
Subsidence
1. Substantial increase in subsurfacedata and knowledge; recovered andtested ~ 4 km of core material andmeasured pressures/temperatureswithin and outside the subsidencebowls
2. Inside the Tauhara bowls, materialat various depths (up to 400m), isanomalously compressible and ofsufficient thickness to explain the
location and amplitude of thesubsidence bowls
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Contact Energy Limited
Adaptive management
1. Adaptive approach enables sound management of effects
2. Requires flexibility to be effective
3. With Tauhara II, Contact will have infrastructure and fluids available toimplement adaptive management
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Contact Energy Limited
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Contact Energy Limited
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Contact Energy Limited
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Contact Energy Limited