Over the past few years, the feed-in of renewable energies has increased noticeably in the region of Magdeburg. In response, 50Hertz plans the construction of a 380 kV overhead line to the Förderstedt substation. The route is about 12 kilometres in length. The main objective of the line extension is to significantly increase the transmission capacity of the existing 220 kV overhead line by converting it to 380 kV. The new line will be equipped with four circuits.
The Renewable Energy Act (EEG) also sets the pace for the southern part of Magdeburg. The increasing feed-in of renewable energies and the continued construction of power stations require an increase of the available transmission and transformation capacity. 50Hertz will take care of this project.
According to the feed-in forecast for wind power turbines, the transmission capacity of the 220/110 kV transformers at the Förderstedt substation will be exceeded in the future. The same applies to the 380/220 kV transformers of the Wolmirstedt substation. For this reason, high voltage grid company Magdeburg GmbH (HSN) and 50Hertz have decided to convert the 220 kV grid, as this is the most durable and economic solution. This also includes the restructuring and expansion of the grid connection points between the high- and extra high-voltage grid in the Magdeburg area. The main objective of the grid expansion is therefore to significantly increase the transmission capacity of the existing 220 kV overhead line by converting it to 380 kV, allowing the further growth of the green energy Segment.
The expected route will take the line from the Förderstedt substation to the connection point south of Welsleben, running parallel to the "Biere II" and "Nr. 5 Langes Feld" wind farms. This involves moving the connection point to the Ragow-Wolmirstedt 380 kV overhead line westward. By choosing a triangular solution, the overhead line will run more to the south in the planned residential area near Welsleben. As a result, a section of approximately 1000 metres can be decommissioned. The new 380 kV grid structure allows approx. 56 kilometres of the existing 220 kV line routes between Magdeburg and Förderstedt to be removed. No legally protected conservation areas are affected.
On 27 March 2013, the Administrative Office of Saxony-Anhalt granted its approval for the plan, authorising the line construction project applied for by 50Hertz. The decision includes about 100 pages with many detailed stipulations on the construction project as well as on compensation for the impact on nature, landscape and property. The preparations for the construction of the 31 pylons started immediately in early April 2013.50Hertz applied for planning approval in January 2012. In March 2012, the procedure was then initiated by the planning authority. During the planning approval procedure, the proposals and positions of the public agencies (incl. municipalities, authorities and associations) and citizens alike are assessed. To this end, the project developer submits a specific plan for public consultation. As part of the public participation procedure, the documents for the approval were available in the city of Staßfurt and the municipality of Bördeland from 2 May to 1 June 2012. The deadline for objections ended on 15/06/2012.On 10 October 2012, the public hearing took place in Bernburg, in the scope of the plan approval procedure. At this meeting, 50Hertz again expressed its position on the more than 50 objections, five of which were raised by individuals, the others by authorities and other institutes involved.
In the scope of the preliminary investigation, 50Hertz already developed four routing variants for the new overhead line in 2009, in accordance with 50Hertz's own routing principles, such as bypassing residential areas, limiting the effects on nature and landscape, bundling the route with other infrastructure routes, integrating the line in the landscape through appropriate alignment and avoiding routes through ecologically valuable areas as much as possible.In December 2009, the route planning started to take shape. After an in-depth examination of the four options and taking into account the remarks of the public interest representatives - ranging from the municipalities involved to the local environmental protection associations and wind farm operators - variant 3, with an originally planned length of some 10 km, was modified and favoured.Afterwards, in May 2010, the application for a spatial planning procedure (ROV) for the project was submitted to the competent planning authority. The regional planning assessment of April 2011 ended the spatial planning procedure with the conclusion that the project is consistent with the spatial planning and environmental requirements, provided that the necessary measures are taken.Additionally, 50Hertz asked the competent planning authority in April 2011 to verify whether the project required an Environmental Impact Assessment (EIA). In May 2011, the authority replied that the assessment was not necessary.
The new 380 kV grid connection and the modernised Förderstedt substation were ceremoniously put into operation on 6 November.