Born in Waterford in 1982, Delaney is a native of Johnstown, County Kilkenny. Delaney first played competitive hurling during his schooling at Coláiste Mhuire. He arrived on the inter-county scene at the age of seventeen when he first linked up with the Kilkenny minor team, before later joining the under-21 side. He made his senior debut during the 2001 championship. Delaney immediately became a regular member of the starting fifteen, and won nine All-Ireland medals, eleven Leinster medals and eight National League medals on the field of play. He was an All-Ireland runner-up on two occasions.