1. Supergrid Joe Corbett, Head of Technical Services 10th May 2010

2. Introduction to Mainstream

4. Innovative, entrepreneurial and ambitious global renewable energy company

5. Owned by Eddie O’Connor and Staff/Management

6. 100+ Employees

7. Management Team Includes:

8. Dr. Eddie O’Connor: Founder & Chief Executive Officer

9. Fintan Whelan: Co-Founder & Corporate Finance Director

10. Andy Kinsella: Executive Director and CEO, Offshore

11. Torben Andersen: Executive Director and CEO, Onshore

12. Board Members Include:

13. Fintan Drury: Chairman

14. Chuck Watson Former Chairman and CEO of Dynegy Inc

15. Sir Roy Gardner Former CEO of Centrica

16. Brendan Halligan Chairman, Sustainable Energy Ireland

17. John Lavery Co-Founder, Airtricity

18. Mark Brown Barclays Capital3

19. Jan ’10: UK: Mainstream and Siemens Project Ventures awarded a contract to develop 4GW as part of The Crown Estate’s Round 3 offshore wind farm programme 4 Jun ’09: US: Acquired from FPC Services, Illinois 787 MW May ’09: Germany: Working towards securing exclusive license for 1,000 MW site Mar ’09: South Africa: Signed JV with Genesis Eco-Energy for 500 MW Mar ’09: Canada: Signed JV with AWEC for 400 MW Feb ’09: Scotland: Awarded exclusive license for 450 MW offshore site Milestones achieved to date Dec ’08: Raised €26m non-bank mezzanine facility Nov ’08: Chile: Signed JV with Andes Energy for initial 400 MW pipeline Aug ’08: Raised €40m equity; €20m from Barclays Capital, €20m from the Board, management, staff and HNWI’s Feb ’08: Seed equity of €32m from founders February 2008

21. The Supergrid

22. Drivers Single Market Competition Energy Security Sustainability Renewable Energy Targets

23. Context 2050 Europe Wind 50% Solar 30% Other 20% 1.5 TW of Offshore Wind!

24. Generation Mix - 2050

25. Recent Plans (example) 10

26. Supergrid is defined as: “an electricity transmission system, mainly based on direct current, designed to facilitate large-scale sustainable power generation in remote areas for transmission to centres of consumption, one of whose fundamental attributes will be the enhancement of the market in electricity.”

27. The Friends of the Supergrid: “is a group of companies and organisations with a mutual interest in promoting the policy agenda for a European Supergrid.” Visit www.friendsofthesupergrid.eu

28. Other Initiatives North Seas Countries Offshore Grid Initiative Adamowitsch Group Super Smart Grid ENTSO-E ERGEG/CEER

29. Supergrid – phase 1 14

30. Power Transfer CapabilityAC versus HVDC transmission 400 kV AC line Overhead lines 320 kV DC line Three 400 kV AC cables Cables Two 320 kVDC cables

31. What is HVDC transmission? Sending End Receiving End DC Line Inverter Rectifier R Convertor/ transformer Vdc F F Idc Capacitor/Filter i i Idc i Iac Iac t t t

32. Submarine Cable Transmission AC AC AC AC AC AC DC Cable Back-to-Back Interconnection Long Distance OHL Transmission DC Line HVDC Uses

33. Station Cost Lines & Stations Comparable costs: AC vs DC DC Break Even Distance DC Convertor Stations AC 800km Overhead Line 50km Submarine Cable AC Sub- stations Transmission Distance 7341200 When does HVDC make Sense?

34. Technology Bulk Power Transfers over Long Distance between SuperNodes HVDC Voltage Source Converter Superconducting Pipes Minimum Losses Demand Side Management Smart Grid Pricing Response Transport Fleet

35. Compare 765kV AC with Superconductor Pipe Source: American Superconductor 20

36. Source: American Superconductor

37. SuperNode Concept SUPERNODE CONCEPT 2.4GW 2 x 500MW 2 x 500MW 400kV 2.4GW ±320kV Converter Station ±320kV 2.4GW 2.4GW 2 x 500MW 2 x 500MW

38. Cost: Supergrid – phase 1 23

39. How much will it Cost?

40. What do we Need? EU Regulator Common Regulatory Framework Super System Operator Single Grid Code Master-plan for 2050

41. What do we Need? Converter Development Lower Costs Lower Losses Higher Current DC Cables Higher Voltage DC Switchgear Super-Conducting Pipes Control & Protection Multi-terminal HVDC Links Inertia?

43. 4,800 TWh

44. >50% Generation from Renewables

45. Proposed Generation Mix:

46. Wind: 43%

47. Solar: 7%

48. Conventional Hydro: 13%

49. Other Renewables (Biomass, Geothermal, etc.): 3%

50. Nuclear: 16%

52. 3,440 TWh

53. >98% of U.S. generation is derived from non-renewable sources

54. Generation Mix:

55. Coal: 48%

56. Natural Gas: 21%

57. Nuclear: 20%

58. Conventional Hydro: 6%

59. Wind: 1%

60. Other: 4%*2008 Data, DOE/EIA † Consumption in Bundled Total Sales

61. US Supergrid

62. European Supergrid