The letter of approval granted to SEZ developer is valid for three years within which "effective steps" are to be taken by the developer to implement the approved project.
"The Board of Approval (BoA) may, on an application by the developer, extend the validity period of the letter of approval. In last three years and current year, 224 developers have sought extension of time for the execution of their projects," Commerce and Industry Minister Nirmala Sitharaman said in a written reply to the Rajya Sabha.
The BoA, a 19-member inter-ministerial body headed by Commerce Secretary Rajeev Kher, deals with SEZ related issues. It provides single window clearance mechanism to developers and units in these zones.
The high number of extensions also reflects the losing interest of investors due to reasons including global economic slowdown and imposition of minimum alternate tax (MAT) and dividend distribution tax (DDT) on these zones.
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So far, 352 such zones have been notified by the BoA out of which 199 are operational.
Recently, in a BoA meeting, government approved the applications of as many as 56 special economic zone developers to surrender their projects.
Replying to a separate question on trade deficit, the minister said that in 2013-14, the gap with China has widened to USD 36.21 billion.
"India's exports to China are characterised by primary products, raw materials and intermediate products. The exports to China face tariff and non-tariff barriers for agricultural products and limited market access in other products," she said.
"The two sides agreed to take positive steps towards rebalancing bilateral trade and addressing the existing structural imbalance in trade that has a bearing on its sustainability," she added.
In 2013-14, the bilateral trade stood at USD 65.85 billion.