1. Towers at Bergey Windpower SMART Wind Consortium Support Structures Subgroup Meeting January 14, 2015 Mike Bergey President & CEO 160 ft. Guyed-Lattice Install for Bergey 10 kW by Niagara Windpower, Upstate New York, 2014

2. Bergey Windpower Co. Bergey Windpower Co. A World Leader in Small Wind  Established in 1977, sole focus on small wind turbines for distributed applications  Pioneered “sophisticated simplicity” turbine architecture and numerous component technologies  Turbines have 3-4 moving parts, require no scheduled maintenance, and have demonstrated 20+ years with 100% availability and zero O&M costs – unique in industry  Longest warranties in industry  Over ~10,000 installations, covering all 50 States and over 100 countries

3. Bergey Products 1 kW 8.2 ft Dia. 10 kW 23 ft. Dia. 6 kW 20.2 ft Dia. Custom Inverters & battery chargers Towers: Multiple styles, 60 – 160 ft.

4. In-House Manufacturing

5. Residential Montana Health Clinic Afghanistan Cell site Kenya Military Atlantic Ocean

6. Grid-Intertie Markets

7. Towers for Small Turbines  Putting a Wind Turbine on a Tower That is Too Short is Like Mounting a Solar Module in the Shade  Towers Should be 18 m (60 ft) Minimum  Towers of 24-37 m (80-120 ft) Recommended  Taller Towers Cost More, But Nearly Always Lower Life-Cycle Costs Due to Performance Improvement  Hot-Dip Galvanized Steel is the Most Common Tower Material  Effective Tower Grounding is an Important Part of Lightning Protection

8. Guyed-Lattice Towers  Least Expensive Type... Efficient Use of Materials  Good Siting Flexibility  Easily Erected with Gin- Pole on Smaller Systems (>10 kW)  Periodic Monitoring of Guy-Wire Tension Required  Simple, Inexpensive Civil Works... Minimal Concrete Requirements

9. Tilt-up Towers  Cost is ~30% More Than Non-Tilting Tower  Easy to Erect Without a Crane  Must have 4-Way Guying  Raising With Hand Winch Possible  Good Choice for Typhoon Affected Areas

10. Self-Supporting Towers  System Cost is ~15-30% More Than Guyed-Lattice Tower  Requires Substantial Civil Works  Smallest “Foot-Print”  Must be Heavy Duty to Provide Proper Stiffness  Growing popularity in active markets with robust subsidies

11. ~ 1 kW Guyed Tubular Tower

12. Guyed-Lattice Towers for 10 kW

13. 10 ft. GL Tower Sections

14. “Guasti 6-Pack”

15. BWC Tower Experience & Trends  Sales trend towards self-supporting towers  Tower heights creeping up: 140’ for 10 kW now common  Resonance/dynamics issues have caused noise but not failures  Good, but not perfect, success with customer supplied towers (using published requirements)  No personal injury claims to date  Path to lower tower production cost is understood – just need volume  Anchoring is a market barrier – cost, time, hassle – better solutions needed