Function-based tariff classification limits waste-to-energy equipment benefits to proven end-use supply.

A waste-to-energy plant boiler flue gas cleaning system is treated as a pollution control device because it performs filtering or purifying functions for gases, so it falls under heading 8421 rather than heading 8405. Concessional rate treatment is available only where the goods are actually supplied for use in waste-to-energy plants; mere capability of use in other power plants is insufficient to claim the specific end-use based benefit. The applicable concessional entry therefore depends on established use in waste-to-energy plants, while classification remains governed by the product's essential function.

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Issues: Whether the waste to energy plant boiler flue gas cleaning system is classifiable under heading 8421 or as a waste to energy plant device under heading 8405, and whether the supply attracts the concessional rate applicable to goods used in waste to energy plants.

Analysis: The product was found to be a pollution control device performing filtering or purifying functions for gases. On its working, it was held to fall under chapter heading 8421 of the First Schedule to the Customs Tariff Act, 1975. The concessional rate for renewable energy devices was considered applicable only when the goods are actually supplied for use in waste to energy plants. The Authority observed that the item is capable of use in other power plants as well, so it cannot be treated as a waste to energy plant device in a generalized manner merely by description. However, where such pollution control equipment is supplied for use in waste to energy plants, it is covered by the relevant concessional entry.

Conclusion: The goods are classifiable under heading 8421, not under heading 8405, and when supplied for use in waste to energy plants they are eligible for the concessional rate under the relevant notification entry.

Final Conclusion: The ruling determined classification on the basis of the product's function as a pollution control device and allowed concessional treatment only when its use in waste to energy plants is established.

Ratio Decidendi: A good is to be classified according to its essential function, and concessional treatment tied to end-use applies only where the specified end-use is actually established.

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