Traditionally, steel plants in India are set up near the raw material source, with almost 85 per cent of the capacity following this pattern, a government report on the Sagarmala project said.
However, a robust coastal shipping network not only offers logistics cost saving, but also flexibility in sourcing raw material as well as better linkages with global markets, it reasoned.
The study analysed models of setting up large coastal clusters globally, including those of Pohang in South Korea for steel and Port Said in Egypt for fertiliser.
"In the case of steel, for example, the savings are driven by no inland logistics for coking coal, reduction in steel transportation through coastal shipping and use of new technology (slurry pipelines) for transporting iron ore from mine to coast," the report added.
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"The total cost saving from these capacities is estimated at Rs 5,500-6,500 crore per annum."
The report identified 40 mtpa capacity for setting up cement plants across the country along the coasts that will help firms save up to Rs 1,000 a tonne on logistics.
In the case of cement, it identified central Andhra Pradesh and southern Gujarat clusters based on the mapping of limestone reserves.
Sagarmala is an ambitious project for port-led economic development of India's coastline.
The programme was launched last year to utilise India's 7,500-km long coastline, 14,500 km of potentially navigable waterways and strategic locations on key international maritime trade routes.