The Sensex is almost flat at 15,507 - up three points.ICICI Bank and Reliance Energy have advanced over 1% each to Rs 906 and Rs 918, respectively.ONGC and Bharti Airtel are the other prominent gainers.Cipla has dropped 1.7% to Rs 169.HDFC Bank has slipped 1.4% to Rs 1,209, and HDFC is down 1% at Rs 2,162.Out of 2,608 stocks traded so far, 1,527 have advanced, 1,005 have declined and 76 are unchanged.