Mumbai, Jan. 17 -- The BSE sensex on Friday rallied by 99.41 points at 42,031.97 as renewed buying was seen in Energy, FMCG, Industrials, Telecom and Auto stocks. The Nifty of National Stock Exchange (NSE) too rose by 24.30 points to 12,379.80. The Sensex registered intra-day high and low at 42,063.93 and 41,850.29 points respectively. The Nifty recorded day intra day high and low at 12,385.45 and 12,321.40 points respectively. The sectoral indices like Energy, FMCG, Inustrials, Telecom and Auto kept the market firm in oopening trade. The gainers were Bharti Airtel by 3.77 pc to Rs 491.90, Reliance Industries by 2.08 pc to Rs 1569.75, HeroMoto Corp by 1.35 pc to Rs 2466.10, M & M by 0.93 pc to rs 572.70 and Tata Steel by 0.77 pc to Rs 498....