World of Coal Ash 2011 will be held in Denver, Colorado 9-12 May 2011. WOCA is an international conference organized by the American Coal Ash Association (ACAA) and the University of Kentucky Center for Applied Energy Research (CAER). The 2011 conference will mark the two organizations’ fourth joint biennial meeting. It will again focus on the science, applications and sustainability of coal ash worldwide. As such, it will encompass all aspects of coal combustion products (CCP’s) as well as gasification products.