Besides, a firming trend at other Asian markets influenced trading sentiments here, brokers said.
The 30-share index flared up by 215.32 points, or 0.77 per cent, at 28,024.67 in afternoon trade.
The gauge has scaled the 28,000-mark after nearly one month as the last time Sensex traded above this mark was on April 23.
Sentiments were buoyed on continued hopes of rate cut by the Reserve Bank at its policy review early next month amid expectations that State Bank of India and ITC may post encouraging financial results later in the day, brokers added.
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Also, the 50-share NSE Nifty was quoting higher by 53.65 points, or 0.63 per cent, at 8,474.65.
SBI shares surged 2.82 per cent to Rs 297.50 while ITC was trading 1.42 per cent up at Rs 332 as participants enlarged positions ahead of these companies' quarterly earnings.
Other prominent gainers among the 30 Sensex stocks were HDFC Ltd, Sun Pharma, TCS, ICICI Bank, ONGC, Gail, L&T, Tata Motors, Axis Bank, BHEL, Coal India, RIL and M&M.