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Small Wind Electric Systems: an Oklahoma Consumer's Guide

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Small Wind Electric Systems: an Oklahoma Consumer's Guide Small Wind Electric Systems An Oklahoma Consumer’s Guide Small Wind Electric Systems Cover photo: This 10-kW Bergey Excel is installed on a 100-ft. (30-m) guyed lattice tower at a residence in Norman, Oklahoma and is interconnected with the Oklahoma Gas & Electric utility. Photo credit — Bergey Windpower/PIX01476 Small Wind Electric Systems 1 Small Wind Electric Systems A U.S. Consumer’s Guide Introduction Can I use wind energy to power my home? This question is being asked across the country as more people look for affordable and reliable sourc- es of electricity. Small wind electric systems can make a significant contribution to our nation’s energy needs. Although wind turbines large enough to provide a significant portion of the electricity needed by the average U.S. home gen- erally require one acre of property or more, approximately 21 million U.S. homes are built on one-acre and larger sites, and 24% of the U.S. population lives in rural areas. A small wind electric system will work for you if: Bergey Windpower/PIX01476 • There is enough wind where you Homeowners, ranchers, and small businesses can use wind- generated electricity to reduce their utility bills. This grid- live connected system installed for a home in Norman, Oklahoma, • Tall towers are allowed in your reduces the homeowner’s utility bill by $100 per month. neighborhood or rural area • You have enough space Contents • You can determine how much Introduction ...................................... 1 electricity you need or want to First, How Can I Make My Home More Energy Efficient? . 2 produce Is Wind Energy Practical for Me? ...................... 3 • It works for you economically. What Size Wind Turbine Do I Need? .................... 4 The purpose of this guide is to pro- What are the Basic Parts of a Small Wind Electric System? . 5 vide you with the basic information What Do Wind Systems Cost? ........................ 7 about small wind electric systems to Where Can I Find Installation and Maintenance Support?.... 8 help you decide if wind energy will How Much Energy Will My System Generate? ............ 9 work for you. Is There Enough Wind on My Site?.................... 11 Why Should I Choose Wind? How Do I Choose the Best Site for My Wind Turbine? . 14 Wind energy systems are one Can I Connect My System to the Utility Grid? ............ 15 of the most cost-effective home- Can I Go “Off-Grid”? ............................... 19 based renewable energy systems. Glossary of Terms................................. 21 Depending on your wind resource, a For More Information .............................. 22 2 Small Wind Electric Systems small wind energy system can lower Home Energy Use your electricity bill by 50% to 90%, Based on national averages help you avoid the high costs of extending utility power lines to Water remote locations, prevent power heating interruptions, and it is nonpolluting. 14% Heating and How Do Wind Turbines Work? Lighting, cooling Wind is created by the unequal heat- cooking, 44% and other ing of the Earth’s surface by the sun. appliances Wind turbines convert the kinetic 33% energy in wind into mechanical power that runs a generator to 02979309m produce clean electricity. Today’s Refrigerator 9% turbines are versatile modular sources of electricity. Their blades are aero- The largest portion of a utility bill for a typical dynamically designed to capture the house is for heating and cooling. maximum energy from the wind. The wind turns the blades, which spin a • Save money and increase shaft connected to a generator that comfort by properly maintaining makes electricity. and upgrading your heating, First, How Can I Make ventilation, and air-conditioning systems. My Home More Energy Efficient? • Install double-paned, gas-filled windows with low-emissivity Before choosing a wind system for (low-e) coatings to reduce heat your home, you should consider loss in cold climates and spectrally reducing your energy consumption by selective coatings to reduce heat making your home or business more gain in warm climates. energy efficient. Reducing your energy consumption will signifi- • Replace your lights in high-use cantly lower your utility bills and will areas with fluorescents. Replacing reduce the size of the home-based 25% of your lights can save about renewable energy system you need. 50% of your lighting energy bill. To achieve maximum energy effi- • When shopping for appliances, ciency, you should take a whole- look for the ENERGY STAR® label. building approach. View your home ENERGY STAR® appliances have as an energy system with interrelated been identified by the U.S. parts, all of which work synergisti- Environmental Protection Agency cally to contribute to the efficiency and U.S. Department of Energy of the system. From the insulation in as being the most energy-efficient your home’s walls to the light bulbs products in their classes. in its fixtures, there are many ways to • For more information on how to make your home more efficient. make your home energy efficient, • Reduce your heating and see Energy Savers in the For More cooling needs by up to 30% by Information section. investing just a few hundred dollars in proper insulation and weatherization products. Small Wind Electric Systems 3 Is Wind Energy Practical structures permitted in residentially for Me? zoned areas, although variances are A small wind energy system can often obtainable. Most zoning ordi- provide you with a practical and nances have a height limit of 35 feet. economical source of electricity if: You can find out about the zoning restrictions in your area by calling • your property has a good wind the local building inspector, board of resource supervisors, or planning board. They • your home or business is located on can tell you if you will need to obtain at least one acre of land in a rural a building permit and provide you area with a list of requirements. • your local zoning codes or In addition to zoning issues, your covenants allow wind turbines neighbors might object to a wind machine that blocks their view, or • your average electricity bills are they might be concerned about noise. $150 per month or more Most zoning and aesthetic concerns • your property is in a remote can be addressed by supplying objec- location without easy access to tive data. For example, the ambient utility lines noise level of most modern residential • you are comfortable with long-term wind turbines is around 52 to 55 deci- investments. bels. This means that while the sound of the wind turbine can be picked out Zoning Issues of surrounding noise if a conscious Before you invest in a wind energy effort is made to hear it, a residential- system, you should research poten- sized wind turbine is no noisier than tial obstacles. Some jurisdictions, for your average refrigerator. example, restrict the height of the In Clover Valley, Minnesota, this 3-kW Whisper H175 turbine on a 50-foot tower is connected to the utility grid to offset the farm’s utility- supplied electricity. World Power Technology/PIX07168 4 Small Wind Electric Systems What Size Wind Turbine Turbines used in residential applica- Do I Need? tions can range in size from 400 watts The size of the wind turbine you need to 100 kW (100 kW for very large depends on your application. Small loads), depending on the amount of turbines range in size from 20 watts electricity you want to generate. For to 100 kilowatts (kW). The smaller or residential applications, you should “micro” (20- to 500-watt) turbines are establish an energy budget to help used in a variety of applications such define the turbine size you will need. as charging batteries for recreational Because energy efficiency is usually vehicles and sailboats. less expensive than energy produc- tion, making your house more energy One- to 10-kW turbines can be used in efficient first will probably be more applications such as pumping water. cost effective and will reduce the size Wind energy has been used for centu- of the wind turbine you need (see ries to pump water and grind grain. How Can I Make My Home More Although mechanical windmills still Energy Efficient?). Wind turbine provide a sensible, low-cost option manufacturers can help you size for pumping water in low-wind areas, your system based on your electricity farmers and ranchers are finding that needs and the specifics of local wind wind-electric pumping is a little more patterns. versatile and they can pump twice the volume for the same initial A typical home uses approximately investment. In addition, mechanical 10,000 kilowatt-hours (kWh) of elec- windmills must be placed directly tricity per year (about 830 kWh per above the well, which may not take month). Depending on the average the best advantage of available wind wind speed in the area, a wind tur- resources. Wind-electric pumping bine rated in the range of 5 to 15 kW systems can be placed where the wind would be required to make a signifi- resource is the best and connected to cant contribution to this demand. A the pump motor with an electric cable. 1.5- kW wind turbine will meet the needs of a home requiring 300 kWh per month in a location with a 14- This 1-kW Whisper mile-per-hour (6.26-meters-per-sec- turbine provides ond) annual average wind speed. The direct AC power for the water pump for manufacturer can provide you with stock tanks on a the expected annual energy output ranch in Wheeler, of the turbine as a function of annual Texas. average wind speed. The manufac- turer will also provide information on the maximum wind speed at which the turbine is designed to operate safely.
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