Aug 27 (Reuters) - U.S. stocks opened higher on Friday ahead of Federal Reserve Chair Jerome Powell’s speech that could offer clues on when the central bank will start paring back its large stimulus program. The Dow Jones Industrial Average rose 18.0 points, or 0.05%, at the open to 35231.11. The S&P 500 rose 4.1 points, or 0.09%, at the open to 4474.1, while the Nasdaq Composite rose 24.0 points, or 0.16%, to 14969.765 at the opening bell. (Reporting by Sruthi Shankar in Bengaluru; Editing by Saumyadeb Chakrabarty) Our Standards: The Thomson Reuters Trust Principles.