Payback period — the time it takes for cumulative energy savings to equal the installed cost — typically ranges from 6–12 years for a WindWhisperer 100 Max installation at a good-wind commercial site in the UK or Scandinavia. But payback is not a single number. It depends on your electricity bill, your site's wind resource, and the government support schemes available in your territory.
This page explains what drives payback and how to estimate yours.
Payback period is determined by three factors, in order of importance.
Current electricity costs. The higher your current electricity bill, the more you save per MWh generated, and the faster you reach payback. A business paying £0.25 per kWh reaches payback roughly twice as fast as one paying £0.15 per kWh. In Scandinavia, electricity prices are lower than in the UK, so payback periods tend to be longer — but so do the lifespans of the equipment, and annual operating costs are lower.
Site wind resource. Better wind resources mean more output, faster savings, and shorter payback. A site with a mean wind speed of 6.5 m/s reaches payback roughly twice as fast as one with 5.0 m/s. This is why wind resource assessment is your first and most important step.
Government support schemes. In both the UK and Sweden, small-scale renewable generation benefits from export tariffs or capital support. In the UK, the Smart Export Guarantee (SEG) pays for energy exported to the grid. In Sweden, the electricity certificate system (elcertifikat) and investment support through Energimyndigheten can improve economics. These are secondary to bill displacement, but they matter.
A logistics facility or small manufacturing unit with:
A WindWhisperer 100 Max installation at this site would typically generate ~230 MWh per year. At that location and resource level, expect actual output around ~230 MWh, depending on height and obstruction.
Annual savings: ~230 MWh × £0.20/kWh = roughly £46,000 per year.
Installed cost (turbine, battery, installation, grid connection, planning): typically £150,000–£180,000 all-in.
Payback: £165,000 ÷ £46,000 = roughly 3.5 years.
This assumes you keep the system for its 20 years lifespan. Over 20 years, that £165,000 investment generates £920,000 in energy savings — a return on investment of 560 percent.
Small wind systems generate electricity at the point of use, with zero transmission loss. You avoid paying distribution charges and grid levies on that energy. The effective value of home-generated or business-generated electricity is not the wholesale price — it is the retail price you would otherwise pay to the grid.
For a business paying £0.20 per kWh, each MWh generated is worth £200 in bill displacement. This makes small wind economics far more attractive than large-scale utility wind, which is typically compensated at near-wholesale prices (£0.05–£0.10/kWh) and passes through distribution infrastructure costs.
Battery storage (included as standard with every HNordic installation) further improves economics by allowing you to store wind-generated electricity and use it during peak-tariff periods. This is particularly valuable in markets with time-of-use pricing, where evening demand (6–10 pm) commands tariffs 30–50 percent higher than daytime rates.
Higher electricity bills. If your site consumes 300+ MWh annually or has particularly high tariff rates (due to demand charges, location, or tariff structure), payback improves significantly.
Exposed location. Sites with mean wind speeds 6.5+ m/s (coastal, upland, rural exposed areas) see output 40–100 percent higher than sheltered sites, directly improving payback.
Multiple turbines. If your site has sufficient space, installing two WindWhisperer 50 turbines or two WindWhisperer 100 Max units allows you to scale impact without duplicating soft costs (planning, grid connection, installation labour spread across two units).
Export tariffs. The UK Smart Export Guarantee and Sweden's electricity certificate system both compensate exported energy. If your consumption is less than generation (i.e., you export surplus), this income improves payback by 10–20 percent.
Wind directors. The WindWhisperer 100 Ultra with wind directors generates ~439 MWh instead of ~230 MWh — roughly 90 percent more output. This shortens payback proportionally, though wind directors add £20,000–£30,000 to installed cost.
Maintenance. The WindWhisperer 100 Max has low maintenance requirements — no yaw mechanism, simplified drivetrain, fewer rotating parts than a conventional turbine. Your maintenance costs are typically £1,000–£2,000 per year including service contracts with your installer. Battery maintenance (typically a health check at 10 years, possible replacement at year 15–20) adds cost near end of life, but both are small relative to energy savings.
Insurance. Renewable energy installations are typically covered under property or business insurance with minimal additional premium. Standalone wind insurance is rarely required for small commercial turbines.
Tax treatment. In the UK, capital expenditure on renewable energy typically qualifies for plant and machinery capital allowances (AIA or WDA), improving first-year tax returns. In Sweden, similar provisions may apply. Consult your accountant on your specific situation.
These factors are real, but small compared to the energy savings driving payback. Even including them, payback rarely exceeds 12 years at good-wind sites with reasonable electricity costs.
UK: Mean electricity costs for small businesses are £0.18–£0.28 per kWh depending on tariff and consumption profile. Good-wind sites reach payback in 6–10 years. Average-wind sites (5.0 m/s) reach payback in 10–14 years.
Sweden: Electricity costs are lower (€0.10–€0.15 per kWh), but so are turbine costs due to shorter supply chains. Payback periods are typically 8–14 years. Wind resources are often excellent (coastal and western Sweden average 6.5–8.0 m/s), partly offsetting lower tariffs.
Norway / Finland: Similar dynamics to Sweden with excellent wind resources in upland and coastal areas.
For sites in lower-wind-resource areas (mean wind speed 4.5–5.0 m/s), payback extends to 12–16 years. Below 4.5 m/s, wind turbines are generally not economically viable; other solutions (solar PV, heat pumps, efficiency upgrades) are more cost-effective.
Ask a question to model payback period and return on investment for your specific site.
See also: How much energy will a vertical axis wind turbine produce? · What wind speed does a vertical axis wind turbine need?
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