Concessional 2.5% GST for goods used in petroleum and coal bed methane operations, subject to certification and conditions. A concessional 2.5% state tax rate applies to intra State supplies of goods listed in the annexure when used for petroleum exploration, production or coal bed methane operations and supplied to licensees, contractors or sub contractors. Eligibility requires production of certificates from the Directorate General of Hydrocarbons and, for sub contractors, affidavits and undertakings; transfers to other contractors/sub contractors require additional certification and undertakings. On disposal, tax may be paid on the depreciated value computed by specified quarterly straight line rates, subject to a maximum residual cap.