1. Mortenson Canada Corporation Proprietary and Confidential Construction and Contracting Clean Energy BC November 8, 2010

2. Mortenson Canada Corporation Proprietary and Confidential WHO IS MORTENSON? One of Canada’s Leading 100% ‘All Renewables’ EPC Contractors Leverage 10,000MW of North American Wind Experience +1,300MW of Canadian Wind Experience –AB (Confidential) –BC (Dokie + Confidential) –MB (St. Joseph) –NS (Glen Dhu) –ON (Prince I/II, Gosfield, Comber) Full Scope of Services –Preconstruction Planning & Engineering –Civil Infrastructure –WTG Foundations (self perform with Mortenson trades) –WTG Installation (self perform with Mortenson trades) –MV & HV Electrical Systems –O&M Facilities, Met Towers, etc.

3. Mortenson Canada Corporation Proprietary and Confidential LANDOWNER CONSTRAINTS Examples –Impact on Non-Participating Landowners –Compensation for Non-Participating Landowners –Communicate “Special” Deals –Cable Depth –Walking Restrictions –Property Corners –Decompaction –Logging/Clear/Grub Limits –Width of Roads –Routing –Drain Tile –Farming Practices

4. Mortenson Canada Corporation Proprietary and Confidential MICROSITING Small Movement vs. High Construction Cost of Sites Cost of Repetitive Wind Studies Local Regulatory Requirements Production vs. Constructability –Knobs

5. Mortenson Canada Corporation Proprietary and Confidential GEOTECHNICAL Civil, Structural, Electrical, etc. –Sub Surface –Time of Year –Impacts on Designs Current Subgrade Conditions Deep Foundations Over-excavations Water –Geophysical –Thermal Conductivity –Mining Activity

6. Mortenson Canada Corporation Proprietary and Confidential ENVIRONMENTAL/SAFETY CONDITIONS Wetlands Archaeological Issues Wildlife Impacts Stream Crossings Other Environmental Constraints Work Safe BC

7. Mortenson Canada Corporation Proprietary and Confidential EXISTING UTILITY IMPACTS Overhead Power Lines Gas and Oil Pipe Lines & Utilities Availability of Power to Laydown Yard Availability of Data and Phones to Laydown Yard and O&M Backfeed Power Availability

8. Mortenson Canada Corporation Proprietary and Confidential PERMITTING Local Authority –Municipalities, Provinces, Etc. Division of Responsibility Place in Schedule Government & Environmental – Wetlands, NAVCAN, Etc. Division of Responsibility Place in Schedule Deliverables Necessary to Secure Secure in Advance

9. Mortenson Canada Corporation Proprietary and Confidential TRANSPORTATION CONSTRAINTS Municipal and County –Road Improvements –Final Road Modifications –Road Use Agreements Delivery Rates –Impacts, Benefits –Transport Surveys Existing Road Conditions and Bridges/Culverts

10. Mortenson Canada Corporation Proprietary and Confidential COMMUNITY IMPACTS First Nations Relationships Economic –Hotels, Restaurants –Local Businesses –Landowners –Local Municipalities / County Revenue Stewardship

11. Mortenson Canada Corporation Proprietary and Confidential SCHEDULE Starts from the commercial operation date (COD) Procurement Planning Design Durations Time of Year (Weather Impacts) Wind Conditions –Erection Road Restrictions Amount of Crane Breakdowns –Bridge Crossings, Other Seasonal Construction Restrictions Wildlife Nesting Restrictions Interconnect Availability

12. Mortenson Canada Corporation Proprietary and Confidential TOP DESIGN AND COST DRIVERS Geotechnical – Foundations Geotechnical – Soil Resistivity - Electrical Site Optimization Public Road Agreements, Conditions, Routing Location of Interconnect Facility Requirements of Interconnecting Facility Electrical Losses Desired Terrain Turbine Vendor Requirements Logistics and Material Variability

13. Mortenson Canada Corporation Proprietary and Confidential OPTIMIZATION OF SITE Access Roads –Project A (134 WTG’s) 55,000 LM Total 410 per Turbine –Project B (137 WTG’s) 49,000 LM Total 357 per Turbine

14. Mortenson Canada Corporation Proprietary and Confidential OPTIMIZATION OF SITE Optimized Access Roads –Project B 41,905 LM –A Savings of 7,095 LM (14.5%) Reduced 90 degree approaches Reduced Entrances/ Shorter approaches

15. Mortenson Canada Corporation Proprietary and Confidential OPTIMIZATION OF SITE Collection Routing Substation Location Project B Project A

16. Mortenson Canada Corporation Proprietary and Confidential OPTIMIZATION OF SITE Crane Travel –Ducks 4-6 Hours –Walks –Clear Path –Disassemble / Reassemble 2-5 Days Crew of 6 18 Total Loads 90 Ton Crane Required to Lift and Assemble Tracks $20-$70K Depending on Level of Breakdown

17. Mortenson Canada Corporation Proprietary and Confidential LESSONS LEARNED Early developer/contractor engagement Integrate engineering and permitting to understand deliverables Utilize standards developed by North American wind industry First Nations participation Site optimization Understand your lender’s requirements Define “local involvement”

18. Mortenson Canada Corporation Proprietary and Confidential CLOSING THANK YOU FOR INVITING ME Opening Canada Office! Mississauga, Ontario December, 2010 Brent Bergland, Construction Executive Mortenson Canada Corporation 763.287.5648 brent.bergland@mortenson.com