Section 10(46) exemption for Punjab State Electricity Regulatory Commission covers regulatory fees and interest as non taxable subject to conditions. Notification under Section 10(46) exempts specified receipts of the Punjab State Electricity Regulatory Commission for 2011-12 to 2015-16, limited to processing fees for tariff determination, licence fees, petition fees, and interest on bank deposits, subject to conditions that the Commission does not engage in commercial activity, its activities and specified income remain unchanged during the years, and it files returns as required by clause (g) of sub-section (4C) of section 139.