Customs duty exemption for specified HVDC project equipment relieves qualifying imports from basic customs duty under statutory authority. Exemption from customs duty is granted under section 25(1) of the Customs Act, 1962, for specified equipment imported by M/s Power Grid Corporation of India Limited for the Rihand Sasaram Biharshariff HVDC Link Back to Back Station; the exemption enumerates capital plant, protection and control apparatus, switchgear, transformers, reactors, filters, cabling, batteries, lighting, HVAC and related spares. A subsequent note records omission of reference to additional duty exemption and later rescission of the notification.