Jan 5 (Reuters) - Wall Street's main indexes opened lower on Tuesday as investors waited for the outcome of Georgia's Senate runoff elections, which are expected to determine the balance of power in Washington.

The Dow Jones Industrial Average fell 19.64 points, or 0.06%, at the open to 30,204.25.

The S&P 500 opened lower by 2.63 points, or 0.07%, at 3,698.02, while the Nasdaq Composite dropped 32.80 points, or 0.26%, to 12,665.65 at the opening bell. (Reporting by Medha Singh in Bengaluru; Editing by Anil D'Silva)