Home Turbine Savings Estimator
Estimate how much energy and money a small wind turbine could save a household.
A small wind turbine can offset a portion of a household's electricity consumption, but actual savings depend critically on the average wind speed at the specific site. This estimator uses a straightforward formula — Annual energy (kWh) = Rated power (kW) × 8,760 hours × Capacity factor (%) ÷ 100 — to give an indicative annual figure. Divide that by your annual home consumption to find the percentage of electricity potentially covered.
The electricity price field lets you estimate indicative savings in your own currency. No currency is assumed. This is a simplified educational tool: real-world output depends on hub height, local terrain, turbulence, turbine losses, and regulatory constraints. Always consult a qualified wind resource assessor before making any purchasing or investment decision.
Estimated home turbine output
Formula: Annual energy = Rated kW × 8,760 h × CF / 100. Savings are indicative, in your own currency. This is a simplified educational estimate. Actual output depends critically on site wind speed, turbine hub height, and local conditions. Always obtain a professional site assessment before any investment.
How to use this tool
- Enter the rated (nameplate) power of the turbine in kilowatts.
- Enter the capacity factor for your site — small onshore turbines typically achieve 15–35 %.
- Enter your local electricity tariff per kWh in your own currency.
- Enter your household's annual electricity consumption in kWh (check your bills).
- Press Calculate to see estimated annual energy, coverage percentage, and indicative savings.
💡 Good to know
All calculations use standard, published formulas and simplified assumptions so beginners can build intuition. For real projects, always consult qualified engineers and site-specific data.
Frequently asked questions
What is a capacity factor?
The capacity factor is the ratio of actual electricity produced over a year to the maximum theoretically possible if the turbine ran at full rated power for every hour. A 5 kW turbine with a 25 % capacity factor produces the same annual energy as that turbine running flat-out for 25 % of the year.
Why might the coverage percentage exceed 100 %?
If the estimated annual energy exceeds your home consumption, the turbine theoretically produces more than you use. In practice you would export the surplus to the grid (subject to local regulations) or use battery storage. It does not mean you have unlimited free electricity.
What capacity factor should I use?
Small turbines at exposed coastal or hilltop sites may achieve 25–35 %. Sheltered suburban sites are often 10–20 %. Consult a local wind resource map or hire an assessor to measure wind at your actual site before buying.
Does this include the cost of buying and installing the turbine?
No. This tool estimates energy value only. Capital cost, installation, maintenance, and grid connection are separate and significant costs that must be factored into any financial analysis.