The six-storey newbuild arose on a site in the Oberhafen district and from there supplies electricity to HafenCity. At the plant, high-voltage (110 kV) is transformed to medium-voltage level (10 kV). Three transformer chambers with the associated technical facility rooms are spread across four levels. Overall, the building is 44 metres long and 14 metres wide, reaching a height of 19 metres. The substation is a concrete structure with deep foundations. For the façade, large-size ceramic tiles alternate with rod-like ceramic elements to create a striking outer appearance. On the west side, a ramp some six metres wide provides access to the transformers. A retaining wall supports the terrace. The building and its access ramp are designed and constructed to provide flood protection. The substation structure factors in possible expansion and power output can be doubled if demand rises.