Refund of Cenvat Credit on SEZ supplies

Yes. The unutilised credit is refundable under Rule 5.

Another way can be cleareance of goods to SEZ under ARE-1 after payment of duty and take rebate of duty paid.

We are exporters of automobile components to europe , usa,north amereca.  We have exported under LUT.  We have not debited the cenvat register for the payment of duty since it is marked as LUT.  Now i have a huge balance in my cenvat credit and i wish to get the same refunded since major of it is for export.  We also do sales within the state of tamilnadu as well cst sales within the country.

Could any one help me as how am i to go about to get the refund of unutilised cenvat credits?

You can take refund of cenvat credit under Rule 5 of Cenvat Credit Rules. You can also export your goods after payment of duty under claim of rebate under Rule 18 of Central Excise Rules.