The BSE Sensex rose 271 points, or 0.3%, to 80,636 in early trade on Tuesday, marking its second straight session of gains, primarily supported by strength in the energy and oil & gas sectors. Investor sentiment was lifted by anticipation ahead of the upcoming Goods and Services Tax (GST) Council meeting this week, amid hopes of GST rate cuts to boost domestic demand. Meanwhile, faster-than-expected GDP growth in Q2 continued to support market optimism. Traders also kept an eye on global trade developments after a US federal appeals court ruled that most of former President Trump's global tariffs are illegal. The Nifty 50 gained 0.4%, climbing above 24,700, while small- and mid-cap stocks outperformed, rising 0.8% and 0.5%, respectively. Among the top movers were Reliance Industries (+2.1%), Power Grid (+2.0%), NTPC (+1.4%), Hindustan Unilever (+1.4%), and Nestle India (+1.3%).