hwstowers@hwstowers.com | +34 943 598 469

HWS | San Sebastian · SPAIN

| +34 943 598 469

HWS | San Sebastian · SPAIN

for Wind Turbines

Simplified to 4 legs. Why more?

HWS CONCRETE TOWERS S.L. (HWS) has Developed and Patented a new PRECAST FOUNDATION for the WIND ENERGY SECTOR, as well as the associated construction methodology.
The AirBASE introduces a new structural scheme that profits from serial manufacturing processes as well as simple transportation and easy on-site assembly.
The AirBase consists of four isolated supports built on-site connected to two precast post-tensioned girders placed in a cross-shape.

With this innovation the foundation can be divided in two parts:

Certified Technology


First part: four isolated supports built “on-site”, that could be either shallow (footings) or deep foundations (piles). Their dimensions depend mainly on the soil conditions.


Second part: two precast girders, therefore industrialized, forming a cross shape and connected to the isolated supports. Their dimensions depend mainly on the wind turbine loads.

The AirBase resists the high loads introduced by the new generation of +4.X MW wind turbines thanks to its structural scheme: the precast girders work as lever arms. 

These girders could present different cross-shapes:


This is the best strategy to REDUCE COST and construction TIME, while offering high QUALITY CONTROL.
More than half of the foundation could be pre-cast, and  as a result, industrialized.


The estimated savings could reach up to 35%, a percentage that will mainly depend on the  soil properties, turbine size and tower height. The bigger and higher, the better.


The advantages of the AirBASE solution are significant in countries and wind farms with bad weather conditions, when working outdoors is limited to only some months of the year, where the quality or  regularity of the concrete is variable, when reducing construction times is critical, when the depth of the four supports is different, where there is a lack of human resources, and so on.

Optimized Structural Scheme:
Isolated support points and lever arm mechanism.



A new SOLUTION for any type of TOWER and any type of SOIL

Certified Technology


DE-RISKING Projects by reducing on-site works


Performed carbon footprint study shows that over 95% of CO2 emissions in construction of wind foundations come from the required materials (concrete & steel). Hence, achieved percentage of material saving reduction will be directly related and similar to the obtained C02 emissions cut.

Up to 45% of material savings

Up to 80% less excavation

Double lifespan

Easy to deconstruct

30 % less CO2 EMISSIONS during Construction of Wind Foundations

Cast-in-place concrete foundation
286 t CO2
200 t CO2

*Study performed for 5.x MW HH150 m wind turbine.

Precast foundation
for wind turbines

System to construct
wind turbines

Precast/Prestressed concrete
wind turbine tower

Precast foundation
for wind turbines