"With savings, gas inflows, good storage levels ... We are very, very optimistic that we will no longer have to worry about a gas shortage this winter," Klaus Mueller said at an energy summit organised by Handelsblatt newspaper.

Mueller said he expected a relatively warm winter which will help the power supply situation in both France and Germany.

(Reporting by Riham Alkousaa, Christoph Steitz and Vera Eckert; Editing by Paul Carrel)