The Sensex is up 43 points at 13,181.Reliance Energy has surged 2.8% to Rs 527. HDFC Bank and ICICI Bank have rallied around 1.5% each to Rs 1,034 and Rs 811, respectively.BHEL and Hindalco have gained 1% each at Rs 2,410 and Rs 185, respectively.Dr.Reddy's and Hero Honda are the other prominent gainers.HDFC has slipped nearly 1% to Rs 1,490.