Excise duty exemption for specified goods from eligible manufacturing units, subject to written option, eligibility and listed exclusions. Exemption from excise duty is granted for specified goods cleared from units in Uttarakhand or Himachal Pradesh, subject to written exercise of option and notification to jurisdictional authorities; applicable only to new units commencing production within prescribed dates or existing units undertaking substantial expansion, limited to ten years from notification or commencement, and excluding specified non-manufacturing processes and goods listed in the Annexure.