Wind Energy Forging Supplier for Spain: Iberdrola, Acciona, and Gamesa Supply Chain

August 6, 2026


Spain is Europe’s second-largest wind energy market with 30+ GW of installed onshore capacity and growing offshore ambitions. Iberdrola (Bilbao), Acciona Energía (Madrid), and Endesa (Madrid) are the primary wind energy developers; Siemens Gamesa — headquartered in Zamudio, Basque Country — is the world’s largest offshore wind turbine manufacturer and Europe’s largest onshore wind OEM. Indian ring rolling manufacturers with S355NL tower flange capability and 42CrMo4 bearing ring capability are positioned to supply Spain’s wind energy supply chain through Siemens Gamesa and the Spanish tower manufacturing sector.

CompanyRoleKey ForgingVolume Potential
Siemens Gamesa (Zamudio)Turbine OEM — global leaderTower flanges, main bearing rings, pitch ringsHigh — global programme access
Iberdrola RenovablesWind energy developer — 21GW+Indirect — through turbine OEM supply chainHigh — ongoing development
Acciona EnergíaWind energy developer + manufacturerTower flanges for Acciona AW turbinesMedium — own turbine production
Windar Renovables (Avilés)Tower manufacturerTower base and intermediate flangesMedium — ring rolling supply
Nabrawind TechnologiesTower technology developerConcrete-steel transition ringNiche — innovation opportunity

Siemens Gamesa Renewable Energy — formed by the 2017 merger of Siemens Wind Power and Gamesa — is headquartered in Zamudio, Basque Country, Spain, and is the world’s largest offshore wind turbine manufacturer. Siemens Gamesa’s onshore platforms (SG 5.0-145, SG 6.6-170) and offshore platforms (SG 11-200 DD, SG 14-236 DD) collectively represent the largest single wind forging procurement programme globally. Tower flanges and bearing rings for all Siemens Gamesa platforms are procured through Siemens Gamesa’s global supply chain managed from Spain Indian forging manufacturers who qualify for Siemens Gamesa supply access both Spanish domestic installations and Siemens Gamesa’s global export programmes.

Acciona Energía — one of Spain’s largest renewable energy companies is unique among Spanish wind developers in also manufacturing its own wind turbines (the Acciona Windpower AW platform, now produced through a JV with Nordex). Acciona’s wind turbine manufacturing at Pamplona uses tower flanges and bearing rings sourced from qualified ring rolling manufacturers. Acciona’s approach to forging supply is similar to Vestas and Nordex they specify material and dimensional requirements and qualify ring rolling manufacturers through their own supplier audit process.

Spain’s onshore wind expansion — targeting 62 GW by 2030 under Spain’s National Energy and Climate Plan (NECP) requires 30+ GW of new installations over 5 years. At an average turbine size of 5 MW (consistent with current Spanish onshore market), this requires 6,000+ new turbines generating approximately 60,000–80,000 individual ring-rolled forging deliveries over the 5-year period. The Spanish tower manufacturing sector (Windar in Avilés, Haizea Wind in Bilbao) sources tower flanges from qualified global ring rolling manufacturers to complete these towers.

Spain’s offshore wind programme — with significant potential offshore the Canary Islands (floating wind) and in the Atlantic coast (bottom-fixed) — is in an earlier stage than the UK or German offshore markets. Spain’s first commercial offshore wind installations are expected in the 2028–2032 timeframe. When offshore installations begin, tower flange diameters will expand from the current onshore Ø2,500–4,000mm range to offshore Ø4,000–5,500mm creating additional demand at the upper end of current Indian ring rolling capacity.

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Vinir Engineering — Capability for this Market

  1. S355NL tower flanges to Ø4,500mm.
  2. EN 10025-3 material certification.
  3. NABL Charpy at -20°C with EN standard reference.
  4. 42CrMo4 bearing ring blanks through-hardened 28–34 HRC with hardness uniformity at 8 circumferential positions.
  5. Face flatness ≤1mm by CMM.
  6. 100% UT with 42CrMo4 calibration standard.
  7. TPI by Bureau Veritas or DNV per Siemens Gamesa or Acciona specification.
  8. Ocean freight Chennai to Bilbao or Santander: 24–30 days.

Frequently Asked Questions

1.What is the SG 14-236 DD and what tower flange diameter does it require?+–
The Siemens Gamesa SG 14-236 DD is the world’s largest commercially deployed offshore wind turbine 14 MW output with a 236 metre rotor diameter (hence ‘236’ in the designation; ‘DD’ = Direct Drive, gearless). The tower for SG 14-236 DD installations at depths of 20–50 metres is approximately 100–120 metres tall with tower base section diameters of 8–10 metres. The tower base flange OD is typically 5,500–6,500mm — beyond Vinir’s current Ø4,500mm mill capacity. The SG 11-200 DD (11 MW, 200m rotor) uses tower base flanges of approximately Ø4,500–5,200mm partially within Vinir’s capacity. For Indian ring rolling manufacturers pursuing Siemens Gamesa offshore supply, the commercial priority depends on which turbine platforms the OEM is deploying in markets accessible from India.
2.How does Acciona’s joint venture with Nordex affect Spanish wind turbine forging supply?+–
Acciona Windpower merged with Nordex in 2016 – Nordex acquired Acciona Windpower’s turbine manufacturing business, and Acciona remained as a wind energy developer and retained a minority stake in Nordex. Nordex now manufactures the Acciona Windpower AW platform turbines (marketed as Nordex N163/5.X in some markets) at Acciona’s Pamplona facility under the Nordex Group supply chain. Tower flanges for these turbines are procured through Nordex’s global supply chain rather than Acciona Energía’s supply chain. Indian forging manufacturers seeking supply to Acciona Energía’s wind development projects effectively engage through Nordex’s supply chain for turbine components, not through Acciona directly.
3.What is Spain’s NECP (National Energy and Climate Plan) wind energy target and why does it matter to forging suppliers?+–
Spain’s NECP targets 62 GW of onshore wind capacity by 2030 up from approximately 30 GW in 2024, requiring approximately 32 GW of new installations in 6 years. At approximately 5 MW per turbine, this requires approximately 6,400 new turbines. Each turbine has 4 tower flanges + 6–8 bearing rings = approximately 10–12 ring-rolled forgings per turbine = 64,000–77,000 ring-rolled forgings total over the programme period. At the current capacity addition rate of 3–4 GW/year, annual ring-rolled forging demand from Spanish onshore wind installations is approximately 6,000–10,000 individual forgings a significant and sustained market for qualified Indian ring rolling manufacturers.
4.How does the Spanish tower manufacturing sector (Windar, Haizea) procure tower flanges?+–
Spanish tower manufacturers Windar Renovables in Avilés and Haizea Wind in Bilbao purchase tower flanges from qualified ring rolling manufacturers and weld them into the tower sections. Tower manufacturers typically qualify 2–4 ring rolling manufacturers per flange diameter range to ensure supply security and price competition. Qualification for Windar or Haizea tower flange supply requires: S355NL material certification per EN 10025-3, Charpy at -20°C with minimum 27 J average, face flatness ≤1mm, and dimensional compliance with the turbine OEM’s flange interface drawing. ISO 9001 or AS9100D quality system certification is required. The qualification process takes 4–8 months shorter than turbine OEM direct qualification. Spanish tower manufacturers are natural first-customer targets for Indian ring rolling manufacturers entering the Spanish wind energy market.
5.What are the logistics and lead time considerations for Indian tower flange supply to Spanish wind projects?+–
Ocean freight from Chennai to Bilbao (Atlantic) or Barcelona (Mediterranean) takes 24–30 days. Total lead time from purchase order to Spanish port is 10–14 weeks for S355NL tower flanges covering material procurement (1–2 weeks, steel is readily available from domestic mills), forging and piercing (1–2 weeks), ring rolling (1 week), normalising heat treatment (1 week), Charpy testing and material certification (1 week), machining and CMM inspection (2–3 weeks), documentation (1 week), and ocean freight. Spanish wind installation schedules are typically planned 6–12 months ahead Indian forging lead times of 10–14 weeks fit comfortably within this schedule when procurement is planned accordingly.