Reliance Group Chairman Anil Ambani on Friday resigned as director of Reliance Power and Reliance Infrastructure, following markets regulator SEBI order restraining him from associating with any listed company. ""Anil D Ambani, non-executive director, steps down from the board of Reliance Power in compliance of SEBI (Securities and Exchange Board of India) interim order,"" Reliance Power said in a BSE filing. In a separate filing to the stock exchange, Reliance Infrastructure said that Anil Ambani has stepped down from its board ""in compliance of SEBI interim order.