Celtic Bioenergy, formerly known as Celtic Composting, was a company established in 2001 by the Ernst and Young Entrepreneur of the Year nominee Dr. Andrew Walsh. Under the leadership of Walsh, Celtic became the leader in the biological treatment of municipal waste and was a project developer for a number of large-scale plant builds in both Ireland and the UK. Since receiving investment, the company was shortlisted for major waste projects with some of the largest industry players such as Greenstar, Viridor, and Veolia. The company was expecting to announce its involvement in a significant joint venture in the UK, which would firmly establish it as an independent bioenergy player in its own right.