The Sensex is now down 1,026 points at 18,026.The Nifty is down 333 points at 5335.Reliance Energy has slumped over 12% to Rs 1,700. ICICI Bank and NTPC have plunged around 9% each to Rs 1,052 and Rs 211, respectively.Bharti Airtel has tumbled 8.5% to Rs 1,015. SBI and Mahindra & Mahindra have shed 7.7% each to Rs 1,775 and Rs 753, respectively.Tata Steel, Tata Motors, HDFC, Hindalco, Reliance Communications, ONGC, Larsen & Toubro, ACC, BHEL, Maruti and Ambuja Cements have dropped 6-7% each.TCS and Satyam have soared around 3% each to Rs 1,102 and Rs 463, respectively. Infosys is the other gainer among the index stocks at Rs 1,880.