The Convention Centre Dublin (CCD) in the Dublin Docklands was officially opened by the Taoiseach on 7 September 2010. The building overlooks the River Liffey at Spencer Dock. It was designed by the Irish architect Kevin Roche. The CCD was shortlisted for the Engineers Ireland Excellence Awards - Engineering Project of the Year 2010. Construction of the project was undertaken by Construction Management Partnership (CMP), a joint venture between Treasury Holdings Limited and John Sisk & Son Limited. The building is iconic for a number of architectural innovations, particularly the glass frontage and numerous curved walls. The building can hold up to 8,000 people in 22 meeting rooms, which include a 2,000-seat auditorium and a 4,500 square metre exhibition and banqueting space. It is the first carbon neutral convention centre in the world because of its use of low carbon cement and the offsetting of unavoidable carbon emissions by purchasing carbon credits in accordance with the Voluntary Carbon Standard. It also features a thermal wheel heat recovery system and an ice storage thermal unit to provide air conditioning for the building. In June 2010, auditions for the seventh series of The X Factor took place at The CCD, with judges Cheryl Cole, Louis Walsh and Simon Cowell. Katy Perry served as a guest judge in Dannii Minogue's absence. The CCD won silver in 'Best Overseas Conference Centre' in the M&IT Industry Awards 2011, second to The Grimaldi Forum in Monaco and beating Bella Center, Copenhagen and The Las Vegas Convention Center. Winners were announced on the 28th of February. In February 2011, the IFTA Awards ceremony took place at the convention centre