The Crystal is a building on Royal Victoria Dock in east London that contains a permanent exhibition about sustainable development. It is owned and operated by Siemens. It is part of the Green Enterprise District policy that covers much of East London. The site is 18,000 square metres in size at the west end of the dock. Using solar power and ground source heat pumps to generate its own energy, it has set a high benchmark for sustainability. The building is the first to achieve the highest sustainable building accolades from the world's two leading accreditation bodies, LEED and BREEAM, Platinum and Outstanding respectively. It is the most sustainable building in London.