hwstowers@hwstowers.com | +34 943 598 469

HWS | San Sebastian · SPAIN

| +34 943 598 469

HWS | San Sebastian · SPAIN

“HWS was invited by VATTENFALL to Amsterdam Headquarters, thanks to the EU EIC event”

May 24th, Amsterdam, The Netherlands.

Mariano Abadia and Erik van der Woude presenting the work of HWS Concrete Towers (www.hwstowers.com) to VATTENFALL (https://lnkd.in/dCEYGiHK), at the event organized by the EU-EIC (https://lnkd.in/d5Z382N6).



• One week ago we had the opportunity to introduce the products that the HWS’ team has been developing in the world of precast/prestressed concrete structures for over ∼45 years.
• Specifically the bridges made of MODULAR parts joined by the simple and efficient AirJOINT/BSST (∑ Parts + Joints = “LEGO concept”), solutions in which we see high applicability to future offshore wind energy installations.
• It was a pleasure to show this work to a very interested and highly qualified team.

More information and examples about this type of innovative (but not recent) bridge solutions:
(1994) https://lnkd.in/dzH29cAv
(2011) https://lnkd.in/dy8b2DYN
(2012) https://lnkd.in/d-8SAzDU
(2014) https://lnkd.in/dr-M_zDz
(2011) https://lnkd.in/dvFf-HaQ


“HWS will attend WindEnergy 2023 (Booth C2-A10), in Copenhagen DK, April 25th to 27 th” (HWS)

Looking forward to seeing you all at WindEnergy 2023, in Copenhagen DK, April 25th to 27 th!

Please feel free tu visit us on the HALL C2 – BOOTH A10, as part of the “Wind Energy Basque Country” group.

If you want to know a bit more about AirCLIMBER self-climbing crane, precast/prestressed concrete AirTOWERs up to 220 m Hub Height, the  AirBASE precast foundations and other HWS CONCRETE TOWERS’ projects in which we are working on all over the world, please do not hesitate in contacting directly to arrange a meeting:

José-Manuel Sorazu, jmsorazu@hwstowers.com

Mariano Abadía, mabadia@hwstowers.com

We will be glad to assist you.


“HWS introduces two new AirTOWER innovative concepts, for WTG” (HWS)


With this we are authors of up to 4 versions and innovative concepts:

v1 GAMESA G10 (2.005): HWS developed in 2.005 its first hybrid tower hired by GAMESA, for then innovative G10’ turbine: 120 m Huh Height (HH), divided in a 80 m of concrete and 40 m of steel.
v2: A simplification of the above is todays’ most commonly used structural-scheme for an hybrid tower, which can reach 140 m HH in full-concrete or 165 m HH in its hybrid version.

Currently HWS continues to work on innovative concepts, introducing recently two new versions:

v3 “aitstar” by IngZero (www.ingzero.com): Looking for the most cost-effective hybrid tower, with a reasonable height of 110 to 130 m HH. It includes simplifying and lowering the cost not only of the parts manufacturing, but also of simpler transport and easier assembly and construction in the field.
v4 “SuperTALL”: Focused on to reach the maximum height —220 m HH or more…— with a full-concrete or hybrid tower. In addition to new structural concepts it requires a special crane, which has also been developed by HWS: the AirCRANE (https://lnkd.in/dhkgFntN).


“New version of the AirBASE: Deep foundation, therefore with PILES but not PILE-CAPS” (HWS)

Today we introduce our last development:

An alternative for AirBASE  as a deep foundation with PILES but NO PILE-CAPS.

Obviously the reduction of materials, cost and CO2 emission is huge, while the structural performance is optimal.

• If you are looking for a TRUE INNOVATION, ….please think in HWS-AirBASE—a precast foundation for Wind Turbines:
• It is the only true innovation in the field—since the P&H concept (USA, 1994)—because it is also a completely new structural scheme, which introduces multiple advantages: https://lnkd.in/dXfZs5sr

Looking forward to seeing you all at Wind Energy 2023 in Copenhagen DK, April 25th.
Please feel free tu visit us on the HALL C2 – BOOTH A10, as part of the “Wind Energy Basque Country” group.

Fair details: https://lnkd.in/d752QGfi, https://lnkd.in/d4Ye7ERS
HWS’ products details: https://lnkd.in/e8fjmFyC, https://lnkd.in/e8vnF_V5

“The HWS-AirBASE—a precast foundation for Wind Turbines: an TRUE INNOVATION in the wind Energy Sector” (HWS)

If you are looking for a TRUE INNOVATION, ….please think in HWS-AirBASE — a precast foundation for Wind Turbines:

It is the only true innovation in the field—since the P&H concept (USA, 1994)—because it is also a completely new structural scheme, which introduces multiple advantages: 

  • Up to 35% COST reduction, depending on the WTG-Model (hub height, tower material, rotor diameter and power rated, which means more weight on top of the tower) and SOIL characteristics.
  • Up to 50% MATERIALS reduction (steel and concrete), while avoiding technical issues and long working time  associated to assembly up to 100-150 t of rebar and pouring 700-1.000 m3 of concrete.
  • Up to 50% CO2 EMISSIONS reduction, which is directly the amount of materials reduction,  since transport and labour represent less than 10% of those emissions.

Several structural and geotechnical advantages: 

  • The load transfer to the soil is much more efficient:  in fact it is regular, improving any “gapping” issues.
  • Being a cross of bridge-girders,  with only a small increase of length you will be able to resist much more momentum, which is the main load the Wind Turbine introduces, and must be resisted and transferred by the foundation.
  • Higher Stiffness, which is becoming an issue in the new WTG’ designs.

Being partially a precast parts, all advantages of precasting are obviously introduced: 

  • Use of more resistant concretes.
  • Better quality control.
  • Better timetable/schedule control.
  • Possibility  of longer lasting working time on the field in strong/rough weathers, both cold and hot.
  • Processes industrialization.
  • Serialization of the design foundation: it is possible to develop a catalogue of foundations for a particular WTG.

If you would like to know more about our project, we will be delighted to welcome you in our booth in n the WindEnergy Hamburg-DE fair, next September 27-30, Hall B2, booth B2.EG.410A.

Kindly reserve your  time slot so we will able to attend you better. Please do it writing to  jmsorazu@hwstowers.com

“CENER met the self-climbing AirCRANE demonstrator, March 18th” (HWS)

ENG: On 18 March, Mr. Pablo Ayesa, General Director, and Mr. Antonio Ugarte,  Director of the Wind Energy Department, both members of the CENER (Spain´s National Renewable Energy Centre, https://www.cener.com/en/) met, at the workshops of the company KEYTECH (www.keytech.es) located in Lecumberri (Navarre), the demonstrator of the self-climbing AirCRANE, development granted by the European Commission, under “Horizon 2020-SME Instrument”, No 804858 (Link to CORDIS: https://cordis.europa.eu/project/id/804858).
Also in attendance were Mr. Juanjo Etxalar and Mr. Telmo Sexmilo, representatives of CLAVE (https:/clave.capital) of Pamplona (Navarre), which manages the participation of the Basque industrial conglomerate MONDRAGON CORPORATION (https:/www.mondragon-corporation.com) in HWS, and that they will shortly expand its participation in HWS, together with INNVIERTE (https://www.cdti.es), to start the worldwide marketing of the developed solution.
In this way HWS Concrete Towers S.L. strengthens and guarantees its future.”
ES: “El pasado 18 de Marzo, D. Pablo Ayesa, Director General, y D. Antonio Ugarte,  Dtor. Departamento de Energía eólica, ambos de CENER (Centro Nacional de Energías Renovables, https://www.cener.com) conocieron en los talleres de la empresa KEYTECH (www.keytech.es) localizados en Lecumberri (Navarra) el demostrador de la grúa auto-trepante AirCRANE, desarrollado con ayuda de la Comisión Europea, Programa “Horizon 2020-SME Instrument”, nº 804858 (Link a CORDIS: https://cordis.europa.eu/project/id/804858).
También asistieron D. Juanjo Etxalar y D. Telmo Sexmilo, representantes de CLAVE (https://clave.capital) de Pamplona (Navarra), quienes gestionan la participación del conglomerado industrial vasco CORPORACION MONDRAGON (https://www.mondragon-corporation.com) en HWS, y que van a ampliar en breve su participación en HWS, junto con INNVIERTE (https://www.cdti.es), para iniciar la comercialización mundial de la solución desarrollada.
De esta forma HWS Concrete Towers S.L. refuerza y garantiza su futuro.

“How much does the Wind Energy learn from Wind Sailing (…and viceversa) ?” (HWS)

As along last decade, completely new wind boats like Americans Cup AC75 monohull vessels (*) are appearing, completely new concepts with an exceptional efficiency which allows to fly over the sea near to 100 Km/h, or even surpassing (∼104 Km) with a Windsurf (**).

(*) The newest American’s Cup AC75 are 75 feet (22.86m) keel-less yachts,  which rise out of the water on hydrofoils and glide across the surface to reach speeds in excess of 50 knots (93 Km/h).

The Challenger yacht “Luna Rossa” had maxed out at 53,4 knots (99 Km/h), (…) and Team New Zealand’s “Te Rehutai” is rumoured to be even faster.

(**) On Thursday, November 18, 2021, in Namibia, Mr. Bjorn Dunkerbeck (the famous Dutch & Canarian 52-year-old famous windsurfer) broke that speed barrier, hitting 103,67 Km/h over a two-second time gap, and holding an average speed of 101,00 Km/h kilometers per hour over a 100-meter stretch of water.


“Certification of AirBASE Concept Design, awarded for the new generation (≥ 5.x MW) wind turbines” (HWS)

TÜV SÜD has Certified the DESIGN BASIS and CONCEPT DESIGN EVALUATION of HWS´ AirBASE foundation for onshore wind turbine generators (WTG).

The design evaluation has included the review of a real case scenario for one of the existing biggest wind turbines in the market, a 5.7 MW with a 150 m high steel tower.

The Certification process started last November 2020 and has lasted for around 6 months. Within the project, TÜV SÜD has performed a profound analysis of a new design methodology required to assess this innovative WTG support system. The technical validation included the review of the geotechnical and structural design, as well as the details of the construction process. The design was proved to comply with IEC21400-22:2010 and other applicable standards like Eurocode 2, Eurocode 3, Eurocode 7, and EIC61400-6.

The work required around 1,750 hours of engineering and the development of near 50 advanced finite element models, among which some general and local models of the soil-structure interaction were analysed. These models were performed in collaboration with the Spanish structural engineering firm INGZERO (www.ingzero.com).


This Certification is a major milestone for the commercialization of the AirBASE and paves the way for the market launch worldwide. In fact, it already created a lot of interest and traction among the key players of the wind sector.

To finalise the development process that started in December 2018 with the patent of the technology, HWS expects to build a pilot in Q1-2022.

About AirBASE technology

AirBASE concept disrupts current structural wind foundation systems by transferring the loads to the soil through four independent supports, which are connected to two/four precast posttensioned girders placed in a cross-shape. This way, the load transfer from structure to soil is optimized, which can become important as the wind turbine size increases.

The AirBASE foundation can be used for any wind turbine, with unlimited rated power, for any wind tower, made in steel or concrete, and any soil conditions.

The bigger the turbine, the higher the cost-effectiveness of the AirBASE.

Its main advantage is the cost reduction: savings can reach up to 35% in certain markets. Other advantages are the industrialization and standardization of the product, which reduces the risk of projects by enhancing the quality control process and reducing construction time and on-site resources.