Exemption under section 35AC extends eligibility for nurses' hostel and solar heating project for additional assessment years. The Central Government specified the Construction, furnishing and extension of a Nurses' Hostel and provision of solar heating at K. H. I. Ghataprabha as an eligible project under the Explanation to section 35AC; following the National Committee's recommendation under rule 11M(5) that execution is proper, eligibility is extended for a further three assessment years commencing from assessment year 1998-99, with an estimated project cost recorded in the notification.