Costs, savings and maintenance
If placed correctly, the benefits that can be gained by installing a small wind system dwarf the costs associated with it. Because wind turbines are suitable for a relatively small proportion of householders, not many installations have been carried out compared to more common technologies such as solar PV. This means that the Feed-In Tariff provides a very good return on your investment.
It is even possible to choose from a range of financing options to cover the upfront cost of systems and their installation. The government is leading the way on this with their new Green Deal initiative.
Costs for a roof mounted 1kW micro-wind system are around £2,000. Mast mounted systems have a larger capacity and cost between £15,000 and £23,000 including VAT at 5% and installation. The larger a system’s capacity is, the more expensive it is, but the more electricity it can generate, earning you more in FIT payments. Find out which size system is best for your home using our free home assessment. Where you put your turbine matters just as much as your turbine’s capacity when it comes to how much electricity you will generate – see our guide to the Installation of Wind Turbines for more information on this.
If you cannot afford the upfront costs of installing a micro-wind turbine, a loan provided by the Government’s Green Deal Scheme could fund the installation for you. This makes the installation in effect free to you, as the savings you make on your monthly energy bill with the turbine are used to repay the loan. These repayments should never exceed your savings. However, these payments do include 7% interest, and so you will make more of a saving over the life of the system if you pay for the installation yourself. Our Green Deal page has more information on the Green Deal scheme.
A typical, mast mounted system on a site with an average wind speed of 5m/s can give you a saving of approximately £350 on your energy bills. You will receive around £160 a year in Export Tariff payments at current tariff rates and around £2,700 a year in Generation Tariff payments. These payments will be paid from when you apply to the FIT scheme for twenty years, with the tariff rates fixed and linked to inflation throughout the period. Under these tariff rates your turbine is likely to pay for itself in 7 years or less. After the system has paid for itself, you will continue to make savings on your bills and receive FIT payments for another 13 years. For more information on the FIT scheme please visit our visit our FIT guide.
A well-maintained turbine system should last for over 20 years, and most turbines will be guaranteed for that time. During the system’s lifetime you may need to replace the inverter at a cost of around £1000-£2000. For off-grid systems, battery life is typically between 6 and 10 years. Your supplier will be able to let you know if you will need to carry out any maintenance checks on your system. It is usually recommended that you get your system checked by a professional every year at a cost of £100-£200.
Estimate the income you could earn from your home using a turbine with our Energy Assessment.
- How much energy does a domestic wind turbine generate?
- This depends on the capacity of your turbine and your local wind speeds. For each KW of capacity that a wind turbine has, it will deliver a KW of power in a constant wind of 12.5m/s. A site with good average wind conditions might deliver about 20-30% of this output. A typical 6kW turbine in a good location should be able to save you around £260 a year on your energy bills, though the real payoff comes from the Feed-In Tariff scheme which can pay you around £3000 a year in tariff payments for generating electricity using your turbine and exporting your surplus.
- What size wind turbine will I need?
- The size of the turbine that's right for your property will depend on a few factors, including whether you want to have a roof mounted or freestanding system, your local wind speeds and the planning restrictions in your area, You should check with the Government's Planning Portal and with your installer when planning your turbine installation.
- How tall are domestic wind turbines?
- The height of a domestic turbine will vary according to manufacturer and model, but generally it varies from 6 to 15 meters (for a roof mounted system) up to 24 meters for a freestanding turbine. In general, the higher up the blades are, the higher the average wind speed that the turbine will experience, giving you a more efficient system. The rotor diameter of domestic wind turbines ranges from 2 meters for a roof mounted turbine, up to around 7 meters for a freestanding turbine, again depending on the model.
- What happens to my electricity supply when the wind stops blowing?
- Without adequate wind blowing, the turbine will not turn and create electricity, therefore you will have to draw power from the grid. This will happen automatically as long as you are connected to the Grid.
- Can an installed wind turbine be re-sited?
- Yes, provided the new site is suitable. However, substantial costs will be incurred to dismantle the turbine, transport it to the new site and re-install it, so ideally in the first place you should spend time selecting the most suitable site before you install it for the first time. If you do need to re-site the turbine, make sure you get multiple quotes from accredited installers for the moving work.
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