Frequently asked questions
Do I need to have an Insurance for the windmill?
You can ask your own insurance company if it’s possible to include the windmill into your existing policy. This can be a low or no cost option.
A separate policy for the windmill can also be requested through many insurance companies. For instance, farmers might choose lightning, fire or storm insurance.
EAZ assists farmers to achieve these options by providing relevant information to insurers.
If you would like further information regarding windmill insurance, please contact our team.
How Is the warranty on the windmill arranged?
All equipment purchased from EAZ is covered under a standard warranty package. Other packages are available to suit customer needs.
Each customer can use their EAZ single point of contact to manage warranty claims. Because we install and maintain all equipment, warranty work is efficient and effective.
If you would like further information regarding warranties, please contact our team.
Do you work within a maintenance plan?
EAZ energy generation installations with wind and solar are maintained as part of the operational EAZ Fleet. We offer a maintenance package with your quotation to suit customer needs.
Equipment performance is monitored centrally by EAZ, with the ability to identify unexpected deficiencies in operation and performance.
To ensure reliability over the long term, inspections and maintenance visits are scheduled on a programmed basis during each year of operation. This ensures that normal wear and tear is managed properly and allows you to meet your guarantee package conditions.
If you are interested in further information regarding monitoring, inspections and maintenance please contact our team.
Why are the blades made of wood?
Wood is a strong and lightweight material. It has a high level of endurance before it breaks. It actually has a superior strength to weight ratio, compared to fibre glass. That's why we choose to use it.
The blades are engineered with a hollow cross section which contains a lightweight foam core for structural and moisture prevention reasons.
Externally, the blades have a composite coating, leading edge protection and a sharp glass fibre trailing edge. This results in better abrasion resistance, sun-water protection and efficiency.
If you are interested in learning more about this topic, you can access further information by contacting us.
What foundation do you use?
We always start with assessing the soil conditions. Based on what we find, we make a selection for the foundation type. We use two types of foundations.
On sand and clay, we use a foundation type based on prefabricated reinforced concrete plates.
We dig a hole of 6m by 6m of 80cm deep. In each corner we lay a concrete plate and put the soil back on top. This gives a wide stance and the soil gives the right ballast. A thick steel cross connects the concrete plates with the mast. This avoids high soil pressures like you would find with poured concrete. An added advantage is that the foundation is removable.
This is our most common foundation.
On weaker soils like peat soil we need to do something extra. In that case we use a pile foundation. The piles rest on a deeper layer of firm soil. Piles are filled with concrete. The same steel cross connects the piles with the mast.
Further information is available, please contact our representatives to discuss the details.
Solar is cheaper than wind, why would i choose wind?
Solar is indeed cheaper to invest in than wind when you only look at the investment per generated kWh. But, solar panels give less usable energy during operation than a windmill.
Wind power is available in smoother, more regular supply. The wind blows most days of the year, from day to night. It costs more to purchase and maintain wind, but it’s also more useable. A windmill turns out to be actually cheaper per kWh generated for self-consumption than solar.
In fact, on our part of the world, solar has only 900 equivalent hours of energy generation where the wind has over 3000 hours of energy generation. Imagine the difference in peak power output to generate the same amount of kWh in a year. That's why solar is the ‘high horsepower’ option in the world of renewables.
Even better is the combination of wind and sun. Windy and sunny days tend to alternate each other. The windmill is the workhorse on the farm. The solar panels kick in when the wind drops. That’s why the combination gives the most usable electricity against the lowest price.
Our representative team can analyse your farm, describe how this will work in economic practice and show the impact of adding small solar support too. Contact us for more information.
How much sound does the windmill produce?
The experience of sound depends from person to person. If you hesitate about the sound of a windmill we can give you addresses from reference projects which can be visited. Our windmill does not deliver much sound according to the measuring we have done in the field (39db at 60m). This would be slightly quieter than conversational speech, similar to the sound of a babbling brook or stream.
We advise to keep a distance of 80m from your nearest neighbour.
Many of our customers take a trip to reference farms, which is a good opportunity to see and hear the windmill in operation.
Please contact our team to arrange it and learn more.
How can I check the promised energy yield?
Energy generation of a windmill Is determined by the amount of wind the blades can capture. Longer blades mean more energy.
There is an easy rule of thumb to check the promised energy yield. This is done by taking the swept area of the windmill’s rotor.
A single square meter of rotor yield:
Near the coast 360 kWh/m2
Average in the Netherlands 290 kWh/m2
Deep inland 220 kWh/m2
Our windmill has a rotor swept area of 137m2, so on average we produce about 40.000kWh.
Don't overestimate the significance of generator power. A bigger generator only gives better yield in high winds, which isn't that often.
We use proven systems to analyse farms for new customers. Key aspects that affect the yield calculation include location, topography, local obstacles and the farm buildings themselves.
Our yield estimates are always slightly conservative, which allows well considered decision making advice for our customers.
More information? Contact us.
Shall I use a higher mast?
Obstacles reduce the average wind speed. A higher mast gets you access to higher, more windy air. However, a higher mast comes with additional costs. That's why we advise the use of a higher mast If there are many obstacles around.
It may not be possible to get a building permit for a higher mast. Most municipalities allow a 15m mast height, but some allow to go higher.
Our team will advise you on the right mast height for your location.
How do i get permission from my council?
EAZ informs every customer about the permitting process whether it’s a normal procedure or with additional topics. This differs per municipality and region.
The EAZ permitting team manages all aspects on behalf of our customers.
Common permitting requirements include:
Firstly, we plan the correct mill location and discuss with the landscaping department
We look at the municipalities specific rules and plans for the areas they manage.
We do geotechnical examinations of the soil to design the foundation.
An acoustic report is generated as a mandatory part of the process.
An ecological quick scan is used to understand the flora and fauna surrounds.
Blade flicker modelling is completed to manage shadow generation by the blades of the windmill.
To manage permission on behalf of our clients, we always provide a single point of contact. This person manages all aspects of the permission during the normally required 8-10 weeks.
Also, this person will keep the client up to date on process steps, and manage any requests for new information.
More questions? Contact us.
What is your vision on windmills in the landscape?
Scale-by-scale: Large Wind
Large-scale windmills transcend the landscape and only relate to large-scale infrastructure such as canals, highways or sea dikes. These windmills can fit into a landscape with a large-scale character, where they can be linked with large-scale elements. The large-scale of their energy generation is in line with the same large-scale energy demand as that of cities and industries.
Scale-by-scale: Small Wind
Small-scale windmills adjacent to the farmyard relate to the size and scale of the farm and the elements around the farm such as silos and trees. Small-scale windmills are a fitting addition the farm’s silhouette. The scale of energy generation of small windmills is in line with the same small-scale of energy demand on the farmyard.
Legibility of the landscape
We have designed our small-scale windmill with its green mast, wooden blades and tail vane in such a way that it’s highly distinctive from a large-scale windmill. We think it is crucial that when you see a small-scale windmill, you immediately understand its size. So, there is no confusion with a large-scale windmill that’s further away. This recognisability of scale contributes significantly to the legibility of the landscape, which positively influences the landscape experience.
Do you have a different question in mind?
Get in touch with our team. We are happy to answer all questions, small or big.