Herzog & de Meuron have received planning permission for Tate Modern 2 - an extension to the Tate Modern contemporary art gallery in London, which was also designed by the Swiss architects.

The 11-storey extension, shown in these new images, will give the gallery 60% more gallery space.

Tate Modern - a conversion of the former Bankside power station - opened in 2000. The TM2 extension is due to open in 2012.

The extension will add a new wing and also convert underground tanks (below), previously used to store oil for the former power station, into new galleries.