Home wind turbines in Switzerland: what to know before you commit

Installing a small wind turbine at home appeals to many owners: producing your own electricity from the wind, with no roof to equip, on a reasonably open plot. The Swiss reality is more nuanced. Between the building permit, the noise rules and a wind that is often too weak in built-up areas, the project needs a proper check before any purchase.

This guide helps you ask the right questions, compare with solar and know when to call a professional. It does not replace the advice of your municipality or of the cantonal energy department.

Home wind turbines in western Switzerland: what exactly are we talking about?

A home wind turbine is a small machine intended to supply a house, a farm, a chalet or a small business premises. It is distinct from large wind farm installations, which come under a completely different procedure and a completely different scale.

There are mainly two families:

• horizontal-axis turbines, with blades that resemble those of large machines, mounted on a mast;
• vertical-axis turbines, often presented as more discreet and suited to urban sites.

Sales pitches sometimes promise a lot for the latter. Be wary of data sheets that state an output without specifying the wind speed needed to reach it: a “nominal” output says nothing about what the machine will actually produce at your place.

Wind in Geneva, the Vaud Plateau or the Valais: the question that decides the project

A wind turbine only produces if the wind is present, steady and little disturbed. This is where most private projects fail. In built-up areas, the wind is slowed and chopped up by neighbouring houses, trees, hedges and changes in the terrain. The closer you get to the ground and to roofs, the more marked this turbulence is.

A few common-sense pointers, with no figures to remember:

• a machine placed on a roof suffers from the turbulence of the building itself, and vibrations are transmitted to the structure;
• a mast in a garden surrounded by trees or buildings sees little usable wind;
• a truly open site, on high ground or in open plain, changes things, but it is rarely in a building zone;
• western Switzerland is very varied: lakeside, the Rhône valley, the plateau, the Jura and the Pre-Alps do not behave in the same way.

Before considering a purchase, you therefore need to know the real wind on your plot, ideally through on-site measurements over a long enough period, or failing that through the analysis of a professional who knows the region. Settling for “it’s windy here, I can feel it” often leads to a machine that turns little.

Building permit for a wind turbine at a private home in western Switzerland

A small wind turbine, whether on the roof, against a façade or on a mast in the garden, requires a building permit. It is not equipment you can put up freely, like a removable garden shed.

In practice:

1. First ask your municipality, which receives the application and tells you which documents to provide.
2. Ask whether the cantonal energy department or another cantonal department must be consulted for your project.
3. Check whether your land lies in a particular zone (landscape protection, listed site, agricultural zone, surroundings of a protected building), as this can change what is possible.
4. Do not order anything before you have a clear answer on feasibility.

Rules and procedures vary from one municipality to another and from one canton to another, whether you are in Geneva, in the canton of Vaud, in the Valais, in Fribourg, in Neuchâtel or in the Jura. Never assume that a rule heard in a neighbouring municipality applies to you.

If you are a tenant or a co-owner, the agreement of the landlord or of the co-ownership is essential before submitting anything.

Noise and neighbours: the OPB applies to wind too

A wind turbine in operation makes noise: that of the blades in the air, sometimes that of the machinery, and vibrations when the machine is fixed to a building. In Switzerland, noise is governed by the Noise Abatement Ordinance (OPB), which sets values to be met depending on the type of zone.

For your project, this means in practice:

• noise is assessed at the neighbouring homes, not only at yours;
• residential zones are generally stricter than mixed or industrial zones;
• the closer the turbine is to neighbouring houses, the higher the risk of objection;
• nuisance is not limited to a number of decibels: the regularity of the noise and the annoyance felt count in objections.

The municipality will tell you how these values are assessed for your plot and whether a noise study is required. Talking early with your immediate neighbours avoids many appeals once the application has been submitted.

Wind turbine or solar panels: compare before choosing

For a house in a built-up area, the comparison with photovoltaics is almost always instructive. Solar panels offer several concrete advantages:

• no moving parts, so no blade noise or vibrations;
• output that depends on how much sun the roof receives, which is simpler to estimate than a turbulent wind;
• common integration on roofs, with procedures that municipalities know well;
• generally lighter maintenance.

The wind turbine keeps its appeal in specific cases: a very open and windy site, an isolated building without a roof suited to solar, or a wish to supplement solar production in periods of less sunshine. In these situations, it remains a project to study, not a solution to install “by default”.

Ask in your quotes for an honest comparison of the two options on your site, with the production assumptions clearly written out. A professional who talks about only one solution without justifying it gives you only part of the information.

What makes the cost of a private wind turbine vary

No price is given here: it depends too much on your situation. Here is what makes the budget of a project vary:

• the type and size of the machine, and the mast height needed to get out of the turbulence;
• the nature of the support: ground foundation, roof or façade fixing, with possible reinforcement of the structure;
• preliminary studies: wind measurement, a possible noise study, the permit application file;
• the electrical connection: inverter, protection devices, the link to the house’s panel;
• access to the site for the crane or machinery, especially on sloping or mountain terrain;
• maintenance over time, as a moving machine wears out;
• costs linked to the permit procedure.

Since production depends heavily on the wind, the purchase cost does not, on its own, tell you whether the project is worthwhile. Only a detailed quote, accompanied by a production estimate for your site, allows you to judge.

Stages of a wind turbine project on a plot in western Switzerland

1. Clarify the aim. Reducing the bill, gaining independence, supplementing an existing installation: the goal guides the choice of solution.
2. Assess the site. Openness, obstacles, available height, distance to neighbours, land-use zone.
3. Ask the municipality and the cantonal energy department. This is the step that avoids unpleasant surprises.
4. Measure or have the wind estimated. Without this data, no production promise is reliable.
5. Compare with solar. Get at least one photovoltaic quote to have a point of reference.
6. Request detailed quotes from several companies in the region, stating whether a wind study exists.
7. Submit the building permit application, then wait for the decision before any firm commitment.
8. Plan the connection with an electrician.

Common mistakes before buying a wind turbine in Switzerland

• Buying before finding out. A machine ordered without a permit may become unusable.
• Relying on the stated output. Without a specified wind speed, the figure means nothing.
• Putting the turbine on the roof without a study. Vibrations, noise transmitted to the roof frame and turbulence reduce the value of the solution.
• Forgetting the neighbours. An objection can delay, alter or block the file.
• Neglecting the connection. The production must be connected properly and safely to the house’s network.
• Ignoring maintenance. Bearings, blades and fixings need regular checks.
• Not comparing with photovoltaics. It is often the most suitable solution for a house in a built-up area.

Connection and safety: the role of the electrician in western Switzerland

Even if the machine is well placed and authorised, the electrical side cannot be improvised. Connecting to the house’s installation, the protection devices, the inverter and the checks are a job for an electrical professional. An electrician can examine your panel, tell you what the project involves and guide you on the procedures linked to the local network operator.

Call a professional as soon as:

• you are considering feeding electricity into the grid;
• the mast or fixing touches the structure of the building;
• you hesitate between wind, solar or a combination of both;
• the land is sloping, exposed or difficult to access.

Request a quote for your wind or solar project

If you would like to compare several options for your house, the simplest way is to describe your site and your expectations: type of building, municipality, roof orientation, openness of the land, current connection. You can request a quote, free and without obligation: your request is passed to craftspeople and companies in the region, who will contact you to prepare their proposal.

State in your message that you want a comparison between wind and photovoltaics, and whether or not you have already contacted your municipality. This allows companies to respond in a more targeted way, and lets you compare quotes based on the same assumptions.