1. Welcome to Cedar Ridge Wind Farm Alliant Energy’s first fully owned-and-operated wind facility

2. We are an investor owned energy-services provider. Our customers… Wisconsin Power and Light (WPL)  455,000 electric  177,000 natural gas Interstate Power and Light (IPL)  526,000 electric  234,000 natural gas Alliant Energy – Who We Are

3. Alliant Energy serves over 1,000 cities and towns within its territory boundaries.

4. Alliant Energy – Who We Are  Headquarted in Madison, WI  General Offices in Cedar Rapids & Dubuque, IA  5,000 total employees  Total Assets - $9 Billion (2009)  Operating Revenue - $3.4 Billion (2009)

5. Alliant Energy – Who We Are

7. Wind Energy Portfolio  Main source of renewable energy  575MW from 18 wind farms  Top 10 investor-owned utilities for wind power purchased  Wind Expansion:  Over $1 Billion by 2011  200 MW Whispering Willow  200 MW Bent Tree

8. Growing Wind Industry

9. U.S. Wind Resources  Wind Energy Potential Rankings:  9 th Minnesota  10 th Iowa  18 th Wisconsin  Source: American Wind Energy Association

10. Wisconsin Wind Speeds Cedar Ridge Site

13. Wind Turbine Terminology 1.Heat Exchanger 2.Generator 3.Nacelle Controller 4.Anemometer Wind Vanes 5.High Speed Coupling 6.Mechanical Brake 7.Gearbox 8.Main Shaft 9.Yaw Motor & Planetary 10.Tower Damper 11.Bed Plate Frame 12.Main Bearing 13.Hub 14.Pitch System 15.Blade

14. Cedar Ridge Wind Farm  Ground broken fall of 2007  Construction complete fall of 2008  41 turbines across 12.2 square miles  68 MW of emissions- free energy  Power 17,000 homes

15. Environmental Benefits  Over the next 20 years Cedar Ridge will offset:  4.5 million tons of CO2  3,500 tons of NOx  6,000 tons of sulfur  50 pounds of mercury

16. Civil Construction  Roads  10 miles  16 feet wide  Foundations  320 yards of concrete  35 tons of steel

19. Cedar Ridge Electrical System  Substation  30 miles of collector system  30 miles of fiber optic  330 terminations  180 underground splices

21. Cedar Ridge Turbine Installation  Special cranes used during erection process:  1 – 350 ton hydraulic crane used for trans- loading  1 – Manitowoc 999: 275 ton crane used for base and lower-mid sections of tower  2 – Manitowoc 16,000: 440 ton crane for “topping out”

22. Cedar Ridge Turbine Facts  41 Vestas V82 1.65MW turbines  Base to tip of blade nearly 400 feet  Statue of Liberty (base to top of torch) = 305 feet  State Capitol = 286 feet  Blade length = 131 feet (each)  Blade weight = 15,000 lbs. (each)  Nacelle weight = 104,000 lbs.

23. Cedar Ridge Turbine Facts  Tower Height = 262 feet  Cut in speed = 8 mph  Cut out speed = 45 mph  Blade rotational speed = 14.4 rpm  Tip speed = 138 mph

24. Turbine 39 Blade Signing Events

25. Operations Center  24/7 monitoring from remote location  Used as an education and training center  LEED® Certified  Eco-friendly recycled, low VOC materials  Regionally acquired and processed materials  Geo-thermal heating/cooling  Powered by wind energy  Low level internal/external lighting  Water conserving fixtures

26. Questions?