Performance and Economics
Bergey 10KW GridTek Wind System
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INPUTS
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Select DOE Wind Class Here:
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This page provides the results of the preliminary analysis of performance and economics of a 10 kW Bergey GridTek system for your home or small business. We have assumed a 100 foot tower and an installed cost of $32,000. If you use a Certified Dealer the costs will likely be higher. If you buy direct and install it yourself the costs are likely to be lower. The assumed installed cost can be changed in the Results section. The installed cost will be reduced by the available grants, rebates, or tax credits.
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Instructions:
1) Select the DOE Wind Class (1-7) for your property from your state wind map.
2) Find your last twelve monthly electric bills or call your utility company to get the electricity usage (in kilowatt-hours or kWh) and the amount of the bill for each month. We need this information to calculate how much energy you use, how much it costs, and what effect a Bergey wind system would have.
3) Select the appropriate state incentive program category.
4) Select the appropriate state/utility Net Metering category.
5) Click the "Compute" button.
6) Changing the assumed Installed Cost in the Results section will automatically re-compute the results.
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Enter Information From Utility Bills:
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Month |
Usage
(kWh) |
Amount
($) |
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January |
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February |
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March |
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April |
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May |
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June |
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July |
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August |
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September |
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October |
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November |
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December |
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Available Credits, Rebates, Etc.:
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Availability of Net-Metering:
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RESULTS
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Your Electricity Use
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| Annual Energy Use (kWh): |
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The average U.S. home uses ~8,000 kWh per year. The average cost of electricity in the U.S. is ~7.5 cents/kWh. We have assumed that you pay a monthly billing charge of $9.00.
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| Average Monthly Use (kWh): |
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| Total Annual Cost ($): |
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| Average Monthly Cost ($): |
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| Average Cost of Electricity (cents/kWh): |
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| Your State or Utility Offers Net Metering?: |
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Your Wind Resource
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| Annual Wind Speed at 33 ft. (mph): |
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A wind resource of at least 9 mph (annual average speed at 33 ft.) is recommended. An average of 9-10 mph is considered low. An average of 10-12 is considered moderate. An average over 12 mph is considered good.
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| Annual Wind Speed at 100 ft. (mph): |
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| Increase in Energy from 33 to 100 ft.: |
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Predicted Wind Turbine Performance
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| Annual Energy Production (kWh): |
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Your performance may vary. Performance within DOE Wind Classes is affected by turbulence, altitude, relative elevation (hint: living on a hill helps), general exposure to the prevailing winds, and tower height. We have assumed that 25% of the wind turbine production is sold back to the utility. We have valued this excess power depending on whether your State or Utility has Net Metering for small wind systems. Monthly savings will be over-stated if Percent of Energy exceeds 100%
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| Average Monthly Production (kWh): |
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| Percent of Home's Energy from Wind: |
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| Average Monthly Savings ($): |
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| Total Annual Savings ($): |
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Predicted Wind Turbine Economics
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| Installed Cost, Before Credits ($): |
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Your economics may vary. Simple Payback Period assumes no interest costs and no increase in utility rates. Free Power Period is an estimate of how long the wind system should operate after it has paid for itself. Total Simple Return assumes a 30-year operating life and a salvage value of $8,000. Approximate Monthly Cost with Financing assumes a 20% down payment, 8-year financing at 9% APR on a home equity loan (interest cost deductibility), and a 20% federal tax rate.
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| Available Credits, Rebates, Etc. ($): |
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| Installed Cost, After Rebate ($): |
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| Simple Payback Period (years): |
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| Average Tax-free Return on Invest. (%): |
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| Estimated "Free Power" Period (years): |
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| Total Simple Return in 30 years ($): |
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| Approx. Monthly Cost, with Financing ($): |
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| Monthly Payment, Less Utility Savings ($): |
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Predicted Environmental Impacts Over 30 Years
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| CO2 Emissions Saved (pounds): |
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Your saved emissions may vary. We have assumed the average U.S. generation mixture: 52% coal, 19% nuclear, 15% natural gas, 11% renewables, and 3% oil & misc. If your utility uses more coal the saved emissions could be higher.
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| SO2 Emissions Saved (pounds): |
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| NOX Emissions Saved (pounds): |
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