The ₹10,000-crore IPO of NTPC Green Energy, set to be India's third largest this year, is open for subscription from November 19-22 at a price band of ₹102-108. Retail investors can bid for minimum of 138 shares, requiring an investment of ₹14,904. Ahead of listing, unlisted shares of the company were reportedly trading with ₹0.7 premium in the grey market.