400-kV-Nordeinspeisung Wien, High-voltage power line in Floridsdorf and Donaustadt districts, Vienna, Austria

The 400-kV-Nordeinspeisung Wien is a 14.3 km high-voltage line from the Bisamberg substation in Lower Austria to the Wien-Nord substation. Its first stretch is an overhead line of bundled conductors up to the cable transition station in Dr.-Nekowitschstraße; from there a 5.5 km underground cable, cooled by water-filled pipes, runs beneath densely built city districts. It carries two 400-kV systems rated at 1,050 MW, and a 120 m culvert crosses beneath the Marchfeldkanal and the Nordbahn.

The line was commissioned on 10 May 2006 by Wiener Netze GmbH, then trading as Wien Energie Stromnetz. It gave Vienna a second connection to the Austrian 380-kV transmission grid, alongside the Wien-Südost substation, and supplies the northern districts of Floridsdorf and Donaustadt.

The line's name, Nordeinspeisung, refers to its role feeding power into northern Vienna, namely Floridsdorf and Donaustadt. It is the city's second link to the supra-regional 380-kV grid, after the Wien-Südost substation. The 120 m Düker beneath the Marchfeldkanal and the Nordbahn is a crossing structure a passer-by can pick out along the route.

The overhead stretch runs from the Bisamberg substation to the cable transition station on Dr.-Nekowitschstraße; from there a 5.5 km underground cable continues to the Wien-Nord substation. The line crosses the Marchfeldkanal and the Nordbahn railway in a 120 m long culvert. The conductors are visible from public paths in Floridsdorf and Donaustadt, but the pylons and stations are operational facilities and are not open to visitors.

Underground cable sections use water-filled cooling tubes that maintain performance during temperature extremes. The overhead sections employ special bundled conductor cables designed to reduce electrical discharge phenomena.