Offshore wind power resource assessment using Oceansat-2 scatterometer data at a regional scale

Abstract

In the offshore region the scarcity of in situ wind data in space proves to be a major setback for wind power potential assessments. Satellite data effectively overcomes this setback by providing continuous and total spatial coverage. The study intends to assess the offshore wind power resource of the Karnataka state, which is located on the west coast of India. Oceansat-2 scatterometer (OSCAT) wind data and GIS based methodology were adopted in the study.The OSCAT data accuracy was assessed using INCOIS Realtime All Weather Station (IRAWS) data. Wind speed maps at 10m, 90m and wind power density maps using OSCAT data were developed to understand the spatial distribution of winds over the study area. Bathymetric map was developed based on the available foundation types and demarking various exclusion zones to help in minimizing conflicts. The wind power generation capacity estimation performed using REpower 5MW turbine, based on the water depth classes was found to be 9,091MW in Monopile (0–35m), 11,709MW in Jacket (35–50m), 23,689MW in Advanced Jacket (50–100m) and 117,681MW in Floating (100–1000m) foundation technology. In Indian scenario major thrust for wind farm development in Monopile region is required. Therefore as first phase of development, if 10% of the estimated potential in the region can be developed then, 116% of energy deficit for FY 2011–12 could be met. Also, up to 79% of the anticipated energy deficit for the FY 2014–15 of the Karnataka state could be achieved.