Section 24(5) in The Petroleum And Natural Gas Regulatory Board (Conduct Of Business, Receiving And Investigation Of Complaints) Regulations, 2007
(5)The Board may permit such person or persons including associations, forums and bodies corporate as it may consider appropriate to participate in the proceedings before the Board if, on the report received from the officer, the Board considers that the participation of such person or persons will facilitate the proceedings and the decision in the matter.
