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Data hampers Indian offshore

Report says more information needed fully assess offshore potential

Data hampers Indian offshore image

More data is needed to properly assess the feasibility of offshore wind sites in the state of Gujarat and Tamil Nadu in India, according to two new reports.

The report by the Global Wind Energy Council-led Fowind consortium said limited data is available currently and when it is available it is subject to high uncertainty.

In particular, there is uncertainty over data relating to offshore wind resources, metocean climate, geotechnical conditions and grid connection, the report said.

It added that there are no publically available on-site wind measurements within both states.

The report noted that eight zones have been identified in both states.

In Gujarat they hav mean wind speeds of 6.8 to 7m/s and with water depths in the range of 15 to 43 metres below LAT. The energy yield is estimated at 18.5% to 29.7%.

In Tamil Nadu, mean wind speeds are in the 7.1 to 8.2m/s range and water depths of 10 to 53 metres. Energy yield is 22.8% to 40.4%.

Because of the danger of typhoons class I or S turbines would most likely be required in Gujarat and I,II or S in Tamil Nadu, together with monopole, jacket or tripod foundations.

The report said the grid infrastructure is good with at least two HV substations and seven ports have potential for installation and O&M bases in Gujarat, while Tamil Nadu has three ports.

The consortium, which also includes the Centre for Study of Science, Technology and Policy, DNV GL, the Gujarat Power Corp and the World Institute of Sustainable Energy, plans further work to improve the potential for offshore wind in the state.

This includes:

  • On-site lidar wind measurement
  • Full site specific feasibility study
  • A logistics and infrastructure assessment
  • Grid connection and transmission assessment; and
  • Identification of further data constraints, particularly ground conditions and metocean data.

Image: The Crown Estate

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