Renewable Energy Options for New Zealand

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• Renewable Energy Options for New Zealand
• Electricity Trusts of New Zealand
• Conference
• 4 May 2006

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Lower Waitaki River, North Otago
North Bank Tunnel Concept
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North Bank Tunnel Concept - location

• Intake from lake behind Waitaki Dam
• Discharge at Stonewall, above Black Point
• Full river flow below Black Point

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North Bank Tunnel Concept

• Scheme provisionally sized for a maximum flow of
  around 260 cumecs through tunnel.
• Scheme power output 200MW 280MW
• Energy 1100GWh 1400GWh (more than enough to
  power every house in Christchurch)
• One cumec of water through NBTC produces 5-6 more
  energy than through Waitaki PS

North Bank Tunnel Concept
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North Bank Tunnel Concept

• 10m and 12m diameter tunnels considered
• Manapouri 2nd tailrace tunnel is 10m diameter
• Tunnel boring machine (TBM) construction
• 2 or 3 TBMs concurrently deployed
• Tunnel diameter influences scheme size, output
  and cost
• Construction Period 4.5 6.5 years

North Bank Tunnel Concept
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Mohaka River, Hawkes Bay
Mohaka River
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Limit of Conservation Order Willow Flat
Raupunga Site (possible alternative) (M15)
Kakariki Site (M20.5)
Mohaka location
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Mohaka Possible Lake at Kakariki Site
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Summary Statistics Base case

• 44MW (may vary depending on live storage options)
• Approximately 210 to 230 GWh
• Capex 150m
• Relatively modest lake 340 ha
• 40 m high dam with mean river flow of 70 cumecs
• Roller Compacted Concrete (RCC) design provides
  flood resilience and lower construction risk

Kakariki
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Mohikinui River, West Coast
Mohikinui River
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0 km
10 km
Mokihinui Location Plan
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Mokihinui Possible Impoundment
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STATISTICS

• Installed Capacity approx. 70 MW
• Flow Mean Flow 90 m3/sec
• Energy approx. 230 GWh (enough energy for
  approx. 27,000 houses)
• Small reservoir approx 250 ha with 3m storage
  capacity
• RCC Dam Construction technology
• Rapid construction time and favourable technology
  for risk management
• Diversion tunnels during construction
• Requires transmission link to Waimangaroa or
  Inangahua further work required

Mokihinui Statistics
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Te Apiti 90MW
West Wind 210MW
White Hill 58MW
Rocklands ???MW
Meridian Wind Developments
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Rocklands Location
Rocklands - Location
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Rocklands

• Site is situated on the Lammermoor Range 69km to
  the north west of Dunedin City 749m to 1080m
  above sea level
• Currently used for grazing and as the catchment
  area for the local irrigation scheme.
• Local communities
• Middlemarch - 15km NE (pop 186)
• Outram 38km SE (pop 609)
• Ranfurly - 40km N (pop 732)
• The average wind speed is lower than West Wind or
  Te Apiti, but is still world class by global
  standards

Rocklands site features
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Rocklands

• Development Envelope provides a basis for
  effects based studies while allowing the best
  technical/commercial solution to be adopted at
  the time of construction
• 176 feasible turbine positions covering 92km².
• Turbines dimensions
• Rotor diameter up to 120m
• Rotor hub height up to 100m
• Turbines are spaced 600m apart
• Potential turbine generator capacity ranging from
  1.8MW to 3.6MW
• Output between 300MW and 630MW (depending on the
  turbine type)
• Connection into the Roxburgh 3 Mile Hill 220kV
  transmission circuits that runs across the
  project.

Rocklands Development Envelope
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Rocklands

• Meridian is currently undertaking consultation
  with key stakeholders
• Depending on feedback from consultation a
  Resource Consent application will be lodged in
  June
• Rocklands is a significant renewable energy
  project that has the potential to assist in
  meeting New Zealands growing energy demands

Rocklands
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Thank You