India

India

Windtech: Turbine makers expand production in India

INDIA: The 2MW-plus class dominates current installations in Asia's second largest market, but as in other low-wind regions, the trends is towards higher ratings and bigger turbines. Eize de Vries visits Vestas' and Nordex's nacelle assembly plants.

Hub assembly… Production workers at Nordex Group’s Chennai facility
Hub assembly… Production workers at Nordex Group’s Chennai facility

Nordex Group and Vestas both operate state-of-the-art production facilities in the Indian seaport of Chennai, Tamil Nadu.

Chennai is a wind-power and automotive-industry hub, where 200,000 engineering students graduate each year.

Many people employed in the wind industry come from the automotive sector, attracted by the higher salaries, even if there is less job security, according to the two companies.

The transition from the old feed-in tariff system to the new renewables auction system resulted in a temporary slowdown for production output during the first two to three quarters of 2017.

The auction system has also increased competition, forcing suppliers to rethink and, if necessary, adjust their product portfolios, their supply chain strategies or both.

To meet the government’s target of 60GW by 2022, the industry will need to install roughly 7GW a year in the 2019-22 period.

In fact, the industry is expected to exceed the official target, with some suggesting it could be as high as 80GW, which would mean installing about 12GW a year.

Relative newcomer

Nordex established its Indian subsidiary in mid-2015, a year before its merger with Acciona Windpower. The company is incorporated in Bangalore, and its new nacelle assembly plant is located about 84km north of Chennai International Airport.

This is the group’s second factory outside Spain dedicated to the 3MW AW3000 nacelle, hub and low-speed shaft assembly.

"The factory layout in Chennai is a satellite design of the AW3000 plant in Spain. We can produce 200 nacelles, or around 600MW, annually in a two-shift system, but we can scale up to 1,000MW with three shifts," says plant manager Harihar Panigrahi.

The initial 3MW AW3000 series with 100-metre rotor diameter was introduced in 2008. Retained key technical features include a non-integrated high-speed geared drivetrain, a large cast main carrier, a low-speed main shaft supported by two bearings, and a doubly fed induction generator with 12kV stator voltage.

Pre-assembly

The huge factory building still looks new. Inside, each nacelle is produced along five pre-assembly stations, starting with mainframe assembly, fitting the rear frame and low-speed shaft.

The final steps involve fitting the rear and roof covers, followed by a full-system test of all individual completed nacelles and hubs.

"The low-speed main shaft and hub are pre-assembled in separate floor areas, currently within a single-shift production system," says Panigrahi.

"During the plant start-up phase, Spanish support teams were brought in to develop and train local teams at managerial levels and on necessary technical skills."

The nacelle production process is supported by overhead cranes moving along rail tracks along the main hall’s longest side.

These are supplemented by in-house developed "intercarts" moving at cross-pathways between the parallel production system areas. Alongside areas for hub and low-speed shaft assembly, there are dedicated zones to receive and inspect incoming components, check bearings, and for temporary storage.

Nordex’s start-up strategy for the new facility involved developing a local supply chain for components and engineering equipment, such as internal cranes, Panigrahi explains.

"Some main components like the main shafts and the castings are still imported today, but the plan is to also source these from India in future.

"We produced the first nacelle and hub in July 2016, and by the end of June 2018 Nordex India had assembled 40 units of the 3MW AW125/3000 volume model. This is currently also the highest rated turbine made in India."

The company has expanded the platform, adding the higher rated 3.3MW AW132/3300 with a 132-metre rotor, and launching the AW140/3000 with a 140-metre rotor in October 2017. This latest model is optimised for specific low-wind conditions, making it a perfect fit for India.

It has already been offered for the latest auctions in the country, with a commissioning timeline from the second quarter of 2019. An AW140/3000 prototype was recently installed in Spain and the type certificate is expected in September.

All AW 3000 variants can be supplied with either tubular-steel or concrete towers, such as the steel towers for a 100-metre hub height and the 120-metre and 137.5-metre concrete towers for the AW125/3000.

"Our concrete towers are manufactured on site in mobile factories, which helps transport logistics and makes greater hub heights possible, which in turn, enhances yield," says Panigrahi.

"We also opened a concrete tower factory in Bijapur, Karnataka state, and a blade plant in Chennai. The latter is a joint-venture with a third party. It produced the first blades in the second half of 2017, and now serves our local AW 3000 blade demand and export markets."

Stalwart

Vestas Wind Technology India, headquartered in Chennai, Tamil Nadu state, is one of the country’s oldest foreign turbine manufacturer subsidiaries, boasting a cumulative installed base of more than 2.3GW (May 2018). Vestas India currently employs more than 2,200 people across the country.

In 2017, Vestas took in orders for around 620MW, including 250MW awarded in the first auction organised by Solar Energy Corporation of India, and all for 2MW-class turbine models.

"The auction system’s first year made 2017 Vestas’ largest in India ever on order intake", says Vestas India public affairs director, Amar Variawa.

"India has high renewable targets and a strong focus on hybrids, so we have to learn quickly from these new challenges and experiences to continue to be successful".

Vestas introduced the 2MW pitch-controlled variable-speed V80-2.0 in 2000 (see below), and the first such model brought to India was the V100-2.0 in 2011.

Five years later, it introduced the low-wind V110-2.0, followed in 2017 by the V116-2.1MW successor model for both low and medium wind speeds. Earlier this year, the firm announced the V120-2.2MW model.

"The first V120-2.2MW blades were made in India this year, and our nacelle factory will produce the 2MW platform nacelles. Vestas also received the first order for V120-2.2MW turbines globally in March this year for a 50MW project in India.

"The V120-2.2MW’s main benefit is that it delivers a more stable energy production, with a higher power output level at lower wind speeds. That’s why we believe it’s a perfect fit for India’s low-wind conditions and the new auction system, which will keep us busy going forward," says Variawa.

More than manufacturing

Vestas India’s main company base in Chennai comprises a state-of-the-art assembly plant for 2MW nacelles, a hub factory and a research and development centre — the firm’s largest R&D facility outside Denmark.

It provides global support to all Vestas product platforms and acts as a global Vestas training centre.

Last year, the company inaugurated a new blade plant in Ahmedabad, in the state of Gujarat, dedicated to 2MW platform rotor blades.

Learning… Vestas’ presence in Chennai includes an R&D and training centre

Turbine main components originate increasingly from India, such as the fully machined castings produced in Puna, Maharashtra state to the north-west of Tamil Nadu.

"The manufacturing plant and local sourcing form an integral part of the nation-wide ‘Make in India’ initiative aimed at creating local jobs and developing a local wind power expertise base", says Variawa.

The nacelle assembly process is organised in two parallel lines, one for drivetrain component and hub assembly, the other dedicated to the nacelles during various assembly stages, starting with mounting the yaw bearing to the main carrier.

Overhead cranes move and hoist-in prepared components, especially drivetrains and fully assembled rear-frames (except transformer) to the nacelle line for final merging.

Multi-wheel movers transport the nacelle to the next station within the factory, and cover and hub mounting are the final process steps. The characteristic Vestas-design rooftop cooler is mounted at construction sites for easier transport.

Pioneering past in India — Building on three decades of cooperation

In the 1990s, Danish supplier NEG Micon and India’s NEPC Group formed an Indian joint-venture, NEPC NEG Micon.

Vestas came to India in collaboration with Indian firm RBB. After their joint venture split up in 2004, Vestas RBB remained an independent sub-megawatt turbine supplier.

The same year, Vestas and NEG Micon merged, as did their operations in India, renamed Vestas India in 2006.

The Vestas’ product timeline for India commenced in 2004 with three NEG Micon models (750kW NM48/750, 950kW NM54/950, and the 1.65MW NM82/1650).

Vestas closed its Indian operations in 2012, to "re-evaluate its current business set-up and approach in India’’, but re-entered the country two years later.

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