Wind Systems that work for Rural Businesseshomepages.gac.edu/~jdontje/documents/WindEnergy... ·...
Transcript of Wind Systems that work for Rural Businesseshomepages.gac.edu/~jdontje/documents/WindEnergy... ·...
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Wind Systems that work for
Rural Businesses
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Wind BasicsBy Al Christensen
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Objective
• To provide a practical understanding of small wind turbine systems.
• Planning through installation process.
• Discuss technology, wind resources, location and sizing.
• Review costs, incentives and tax credits.
• Review utility interconnection and case studies.
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Defining Small Wind Systems
• Small wind systems are rated by their potential generating capacity. The maximum output in watts of the turbines generator is used as a base comparison.
• Example; a 2.5 kW or 2,500 watt turbine system has a generator capable of producing 2,500 watts maximum power.
• Small wind systems are defined as wind turbines with generating capacities between 1 kW and 100 kW.
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What They Do and How They Work
• Blades – Blades work when the wind blows over the blades and the blades then lift and rotate.
• Controller – This piece of equipment starts the wind turbine when the wind speed is at about 10 - 16 MPH and stops when the wind speed reaches 55 MPH to avoid any damage to the turbine.
• Generator – Generates 60 cycle AC electricity.• Towers – Towers are made of tubular steel, steel
lattice or concrete and taller towers help generate more electricity since the wind rate increases with height.
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Parts & Pieces
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Basic Types of Systems
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U.S. MARKET TRENDS
At A Glance: The market for small wind in the U.S. in 2008 Units sold 12,092, of which 11,487 (95%) were sold by U.S.by manufacturers.
14% growth since 2007, representing 9.7 additionalmegawatts (MW) of capacity, Sales of $42,000,000
Figures in all charts in this study represent additional units/kW/$ sold, not annual accumulation.See the data revision to the 2007 AWEA Small Wind Turbine Global Market Studyhttp://www.awea.org/smallwind/documents/Data_Revision_to_the_2007_AWEA_Small_Wind_Gl
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WHERE SMALL WIND TURBINES ARE BEING SOLD
Predominantly homes, farms, ranches, small businesses, industry/factories, public and private facilities, and schools. Small wind systems continue to be sold in all 50 states, and U.S. manufacturers export to over 120 countries.
Serious markets in the U.S. exist only in states that offer incentives to helpconsumers afford their still high up-front cost. The market is then often furtherrestricted, even in states with incentives, to towns and counties that have enacted zoning ordinances and permitting processes that allow for the practical, affordable installation of small wind systems.
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MARKETING MESSAGES
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TECHNOLOGY ADVANCESThe industry is diverse and manufacturers vary widely in degree of maturity. Over 300different models (in various stages of development) exist worldwide, of which 100 areengineered by U.S. manufacturers.Specific design advances include:• Active pitch controls to maintain energy capture at very high wind speeds• Vibration isolators to dampen sound• Advanced blade design and manufacturing methods• Operation capability in lower wind speeds• Alternative means of self-protection in extreme winds• Adapting a single model to either on-grid or off-grid use• Slower rotor speeds (to reduce sound levels)• Software and wireless display units• Inverters integrated into the nacelle (rotor hub)• Rare earth permanent magnets rather than ferrite magnets• Induction generators in place of power electronics• Electronics designed to meet stronger safety and durability standards• Systems wired for turnkey interconnection• More visually attractive• Integrating turbines into existing tower structures, such as utility or light poles
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COSTS
Small wind turbine costs (U.S.) $ per W of capacity $3-5
$ per kWh of production $0.10 - $0.15
Calculations do not assume state or federal incentives.
MARKET BARRIERS
Barriers for the small-turbine market continue not to be technological, but ratherfinancial, political, legislative, and regulatory. Studies consistently identify cost as the single largest factor affecting the industry’s growth. However, zoning and permitting hurdles follow as a very close second.
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Manufacturer Models (Rated Capacity)
Abundant Renewable Energy
www.abundantre.com
ARE110 (2.5KW), ARE442 (10KW)
Aerostar
www.aerostarwind.com
Aerostar 6 Meter (10KW)
AeroVironment
www.avinc.com
AVX-1000 (1kW system)
Bergey Windpower Co.
www.bergey.com
BWC XL.1 (1 kW),
BWC EXCEL (10 kW)
Energy Maintenance Service
www.energyms.com
E15 (35 kW or 65 kW)
Entegrity Wind Systems
www.entegritywind.com
EW50 (50 kW)
Gaia-Wind Ltd
www.gaia-wind.com
11kW
Northern Power
www.northernpower.com
NPS 100 (100 kW)
Proven Energy, Ltd.
www.provenenergy.co.uk
Proven 2.5 (2.5kW), Proven 6 (6kW), Proven 15 (15kW)
ReDriven Power, Inc.
www.redriven.net
2kW 5kW 10kW 20kW
Southwest Windpower Co.
www.windenergy.com
AIRX (400 W), Whisper 100
(900 W), Whisper 200 (1 kW), Whisper 500 (3 kW),
Skystream 3.7(1.8 KW)
Ventera Energy, Inc.
www.venteraenergy.com
VT10 (10kW)
Wind Turbine Industries Corp.
www.windturbine.net
23-10 Jacobs (10 kW),
31-20 Jacobs (20 kW)
*Certified or qualified by recognized agencies as meeting established standards and recommended business practices
(see http://www.powernaturally.com/Programs/Wind/qualified_wind.asp?i=8 and http://www.consumerenergycenter.org/cgi-bin/eligible_smallwind.cg ),
and/or determined by AWEA's Small Wind Turbine Committee as commercially available with multiple publicly accessible operational installations in
the U.S.
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Horizontal Axis Wind Turbines (HAWT)
Vertical Axis Wind Turbines (VAWT)
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Reviewing The Prerequisites to Installing a Small Wind System
• Investigating land use and zoning restrictions.
• One of the first steps in the process, check with the local permitting and zoning authority, insure they have an ordinance on the books.
• Understand the height restrictions, tower types acceptable and specific process the permitting authority would like to see followed.
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Obtaining a wind energy assessment and finding a consultant
• In MN please see the following web site link to find wind assessors, consultants & installers in MN, http://www.state.mn.us/mn/externalDocs/Commerce/Hiring_a_Renewable_Energy_Dealer_121302010223_How2Hire.pdf
• www.energy.mn.gov , new web site for information about renewables in MN
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• Educational Programs
• http://www.windpoweringamerica.gov/schools/
• Schools
• http://www.windpoweringamerica.gov/schools/projects.aspeducation/education_training.asp
• http://mercator.nrel.gov/imby/
• http://www.nrel.gov/gis/wind.html
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• Making sure you receive a comprehensive assessment.
• A good wind site assessment should cover a thorough review of the wind site characteristics.
• Including permitting and zoning approvals, setbacks, tower types and heights, wind resource at the site to various hub heights, distance to interconnection and obstacles, electrical use, electrical interconnections, NEC 2008 code compliance, utility interconnection, a review of estimated costs, performance/output and incentives that would apply.
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Working with your local utility & availability of Net Metering
• The states of MN and WI have passed laws giving residents the legal right to interconnect or grid tie their wind turbine system or PV system to the utility grid.
• MN has a net meter limit of 40 kW, over which the clients retail rates will no longer apply.
• WI net meter limit is 20 kW.
• Contact the electric utility and request their distributed generation agreement form.
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Incentives
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Obtaining rebates, incentives and tax credits
• To learn of available rebates in all states, visit www.dsireusa.org
• MN, www.energy.mn.gov
• www.rurdev.usda.gov/rbs/busp/9006loan.htm
• In general wind now qualifies for the 30% federal tax credit incentive, no cap. Then by state incentive, utility programs and business can also take advantage of accelerate depreciation through the MACRS program
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Installing A Small Wind Energy System
Sizing a small wind system
• Load
• Budget
• Site and/or zoning restrictions
• Wind resource
• Objective
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Estimating the energy output
• Wind speed from maps or assessment
• Surface friction
• Formula for wind speed at hub height
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Location considerations
Obstructions
Hills, Trees, structures
Distance to interconnection
Setback requirements
Access
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Location Considerations
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Overview of the installation process
Permit in hand
Interconnection agreement with utility
Qualified and experienced contractor
Any and all incentive programs reviewed and pre-approved if needed prior to purchase
Engineered plans, electrical and structural, warranty agreement
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Can you do it yourself
Yes, check with permit and zoning to see if there are restrictions and manufacturer restrictions if any for warranty issues.
Requires project managing sub contractors, may end up costing more than experienced crew.
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ExcessReturns to Grid
Net Metering
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Connecting to the utility grid
Most Utilities now have a Distributed generation Agreement in place and will send, fax or email. Have an experienced wind installer complete.
One time connection fee, approximately $250, includes a required anti-islanding test and a meter swap to a net meter, billing setup.
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Repair, maintenance and longevity of the system
Expected system life is 20 to 25 years with proper maintenance.
Qualified wind installers provide yearly maintenance visits. Each system has a manufacturers yearly maintenance routine.
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Case Studies of Small Wind Installations
• Examining residential, commercial and rural installations
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Camden Park, SW MN
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Ellsworth, WI 20 kW Jacobs
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Aarsheim’s
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Example Mid Sized Turbine
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Example Large Turbines, Wind Farm
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Dubious New InventionsVertical Axis Wind Turbines
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Resources and References
Map Resources
• Google Earth and Virtual Earth
• Mapquest.com
• Maps.yahoo.com
• Terraserver-USA.com
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Books
• Wind Power – Renewable Energy for Home, Farm and Business, by Paul Gipe, Chelsea Green, 2004, ISBN 1-931498-14-8. Great wind energy book, best overall.
• Wind Characteristics – An Analysis for the Generation of Wind Power, by Janardan S. Rohatgiand Vaughn; Alertnative Energy Institute, West Texas A&M University. Best book for sitting wind turbines.
• Wind Power Workshop, by Hugh Piggott; Center for Alternative Technology Publications, 1997; ISBN 1-898049-13-0
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Additional Resources
AWEA, American Wind Energy Association: www.awea.org
Windustry MN: www.windustry.org
USDA, United States Dept. of Agriculture, www.rerdev.usda.gov
Database of State Incentives for Renewables and Efficiencywww.dsireusa.org
MN Renewable Energy Society, www.mrenewables.org
WI, Midwest Rnewable Energy Association, www.the-mrea.org
WI Focus on Energy program, www.focusonenergy.com
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