Industry analysts stated that exports are growing from these zones, but observed that the government should do more to step up shipments.
"In the GST (Goods and Services Tax) regime, units in SEZs have advantage compared to the units in domestic tariff area," Chairman of Export Promotion Council for EOUs and SEZs (EPCES) Rahul Gupta pointed out.
He felt that the government should set up a proper refund mechanism for duties to be paid by SEZs when they buy products from outside these zones.
Exports grew about 12 per cent to Rs 5.24 lakh crore in 2016-17 as against Rs 4.67 lakh crore in the previous financial year.
These zones have attracted investments worth Rs 4.33 lakh crore up to June this year, the data showed.
The highest number of SEZs are operational in states like Tamil Nadu, Karnataka, Telangana, and Maharashtra.
Till September 7, the government has approved as many as 424 zones, of which 222 are operational.
EPCES has stated that SEZ developers and units receiving such supplies were required to pay duties first and then seek a refund, which is a cumbersome process.
Exports from SEZs and export-oriented units (EOUs) contributed about 33 per cent to the country's total shipments.