The respondent herein (assessee) paid Rs.14,26,952/- as Central Excise Duty to RG 23 Part II account. When it was pointed out by the Department that such duty cannot be paid from RG 23 Part II account, the assessee paid equal amount through PLA and claimed refund of duty paid from RG 23 Part II account from the Asst.Commissioner. The Asst.Commisioner granted him refund of Rs.2,96,349/- and rejected the claim of Rs.11,30,603/- as time barred. Subsequently, on appeal the refund of Rs.11,30,603/- was also allowed. The appellant-assessee requested for interest on refund of the said balance amount of Rs.11,30,603/-. The assessee's claim for interest was denied by the Dy.Commissioner of Central Excise and also in appeal by the Commissioner of Central Excise (Appeals). In further appeal before CESTAT, CESTAT allowed the assessee's claim for interest under Section 11BB of the Act. The Tribunal has held that the assessee is entitled to interest with effect from the date of expiry of three months from the date of receipt of the application for refund by the department. The revenue has, therefore, filed the present appeal.