Tax exemption approval under section 10(23G) granted with compliance, audit and infrastructure-continuity conditions for a hydroelectric project. Approval is granted to the Nathpa Jhakri Hydroelectric Power Project as an enterprise eligible under the Income-tax Act for specified assessment years, conditional on compliance with the Act and Rules governing infrastructure undertakings. The approval will be withdrawn if the undertaking ceases to operate as an infrastructure facility, fails to maintain books of account and obtain the required audit by a qualified accountant, or fails to furnish the prescribed audit report.