Section 3(2)(ii) in The Energy Conservation (Energy Consumption Norms and Standards for Designated Consumers, Form, Time within which, and Manner of Preparation and Implementation of Scheme, Procedure for issue or purchase of Energy Saving Certificate and Value of Per Metric Tonne of Oil Equivalent of Energy Consumed) Rules, 2012
(ii)If the difference of specific energy consumption between lowest specific energy consumption of designated consumers and weighted average specific energy consumption of designated consumers in a sub-sector is less than 25 percent.the energy consumption norms and standards for the first 10percent. designated consumers in a sector provided that the number of such designated consumers is more than or equal to 10 numbers in the a said sub-sector shall be determined based on any of the following alternative equations, namely:-