AEGEAN INTERCONNECTION PROJECT

Athens, 24th May, 2011

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Index

1. The Company2. The Aegean Project3. Why the interconnection?4. Interconnection and MSP: discussion subjects5. Conclusion

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Rokas Group - Installed Wind and PV Farms

ROKASGROUP operates and maintains 17 W/Fs of

total capacity 255,3 MW and 2 Photovoltaic Farms of

total capacity 2,2MW, distributed all over Greece

Total installed capacity 257,5MW

ROKASGROUP employs over 200 people

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Rokas Group – Installed Electrical Infrastructure

Medium & High Voltage Grids

Medium Voltage Grids

ROKAS Owned (Internal Grid)

(km)

PPC Owned (Connection Grid)

(km)Total Overhead Medium Voltage Grids 35,41 41,98Total Underground Medium Voltage Grids 62High Voltage GridsTotal Overhead High Voltage Grids 20

SubstationsROKAS Owned

(Number)PPC Owned

(Number)Total Substations 20/150 kV 3 2

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Iberdrola Renovables, a world leader…

Installed Capacity by 1st Quarter 2011:

2010 Generation:

12,834 MW

25,405 GWh

No 1 Wind-energy producer in the world

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IBERDROLA, the utility: managed assets (1)

916 substations, 19.591 km HV, 215.290 km M&LV lines

Production: 154.000 GWh / Distribution: 100.596 GWh

World leader in wind power, Spain’s leading energy group and one of the top 5 electric

companies in the world

Total installed capacity: 45.000 MW

(1) year end 2010

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Index

1. The Company2. The Aegean Project3. Why the interconnection?4. Interconnection and MSP: discussion subjects5. Conclusion

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The Aegean Project

• Interconnection of Lesvos, Chios and Limnos with mainland via a 443 km long submarine cable

• Installation of wind capacity totaling 706MW

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The Interconnection

• 1High Voltage Direct Current circuit (Evia-Chios)• 2 HV AC or DC circuits under investigation• Direct current rated voltage: 150-300 kV• 706 MW capacity• Submarine cable total length: 443 km • 4 converter stations DC/AC• Connection to Larimna (mainland) ultra HV centre

HVDC linksMax

Depth (m)

Capacity (MW)

Lesvos-Aliveri 550 706

Lesvos-Limnos 300 250

Chios-Lesvos 350 150

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Interconnection Scenario of Lesvos, Limnos, Chios with the Interconnected System

• Interconnection of Lesvos-Evia via DC link• Interconnection of Lesvos-Chios via AC or DC link• Interconnection of Lesvos-Limnos via AC or DC linkMainland• Installation of an AC/DC converter station (C/S) close to Larimna 400kV substation• Underground lines (HVDC) to connect Larimna S/S with Viotia and Evia East with

Evia West landing pointIslands• Installation of a AC/DC C/S on each island• 218km HVDC submarine cable connection from Evia landing point to Lesvos • 84km HVDC submarine cable connection from Lesvos to Chios • 117km HVDC submarine cable connection from Lesvos to Limnos

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Point to Point vs. Multiterminal Interconnection

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• Cables are placed at a distance of 20m from the sea shore in a common trench of 2m depth that is covered by 25cm of concrete

• From there onwards and up to a sea depth of 15m, cables are placed in separate trenches of 2m depth

• From sea depth 15m, cables are inserted in separate trenches of 1m depth

Submarine Cable

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Key W/Fs CharacteristicsWind Turbine Generator (WTG) Characteristics

Type G80 / G87Capacity 2MWDiameter 80m (G80) / 87m (G87)No of Blades 3Blades Length 42,5m / 39mVoltage of WTG 690 AC VoltsTemperature Range -20 to +30 0C

Electrical Infrastructure per IslandNo of Converter

Stations No of Substations

Lesvos 1 2Chios 1 2Limnos 1 2

MV of 20, 33 or 66 kV

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Index

1. The Company2. The Aegean Project3. Why the interconnection?4. Interconnection and MSP: discussion subjects5. Conclusion

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Connects three islands of national importance with the mainlandGeopolitical

Channeling energy into the islands, solving in a reliable way their power supply problems

Security of supply

Development of RES / reduction of energy dependency on imports / update of electrical infrastructureStrategic

Reduced CO2 emissions / contribution in meeting EU RES targets for 2020

Environmental

Reduce the electricity bills for local residencesLocal acceptance

Reasons for the interconnection…

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Index

1. The Company2. The Aegean Project3. Why the interconnection?4. Interconnection and MSP: discussion subjects5. Conclusion

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Planning and Licensing – Conflict Subjects

Great depths and Long distances

Lying of submarine cablesTectonic faults and Earthquakes

Landing Points for each island interconnectedCrossing Evia Island for System interconnection

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Electrical System – Conflict Subjects

Black Start Possibility

Regulation of the active and reactive power

Calculation of the interconnection losses

N-1 and ways of fulfillment (loop connection)• Interconnection of Larimna with Chios-Lesvos-Limnos- UHV

S/S Filippoi (or Nea Santa)

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Index

1. The Company2. The Aegean Project3. Why the interconnection?4. Interconnection and MSP: discussion subjects5. Conclusion

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Conclusion

There are technical and planning problems. We can deal with them and manage to solve them BUT the

CRUCIAL POINT

is the LOCAL ACCEPTANCE of this kind of projects

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AEGEAN INTERCONNECTION PROJECT

Athens, 24th May, 2011

www.rokasgroup.gr

Thanks for your attention!

When you find your path, there’s no turning back. IBERDROLA.