The Sensex is up 183 points at 17333 on resumption of trading after the sun outage break.The benchmark Sensex, shot up by over 105 points to set an intra-day peak in early trade at the Bombay Stock Exchange today on sustained buying by funds led by refinery stocks amid firming global trend.Tata Steel is has rallied 6.34% to Rs 845. REL too is up 4.36% at 1,166. Ranbaxy has risen 3.46% to Rs 434.95. Hindalco is up 3.41% to Rs 169.70.SBI, RCom, Cipla are all up between 2-3%. ITC, Maruti and Satyam are up more than 1%.The wide-based National Stocks Exchange's index Nifty is now up 51 points at 5,051.Marketmen attributed the consistent rise in key indices, Sensex and Nifty, to firm global stock markets such as US Dow Jones, Hong Kong's Hang Seng and Japan's Nikkei.