EQOS Energie will replace the double-circuit lines between the Deutsch Altenburg and Lassee substations.
EQOS Energie was awarded the contract to renew the double-circuit lines between the Deutsch Altenburg and Lassee substations by Netz Niederösterreich GmbH. The project worth EUR 7.5 million started in February and is scheduled for completion at the end of September 2022. During construction, the overhead line experts of EQOS Energie will manage the replacement construction over 15 kilometres of the 110-kV double-circuit line from Deutsch Altenburg to Lassee. The project also includes the new connection of the 800-metre 110-kV line from Lassee to Untersiebenbrunn, which will go to the planned Lassee substation in the future.
Special requirements to protect archaeology and nature
The replacement construction requires maximum diligence in various respects and is subject to particularly stringent requirements. For example, the 15-kilometre double-circuit line runs through the market town of Petronell-Carnuntum, which is known for its Roman-era excavations.
Therefore, special requirements apply for the protection of the archaeological cultural assets in this section, which includes both the existing and the newly planned line route. The remaining route runs almost entirely through the nature reserve known as “Nationalpark Donau-Auen” with an area of 9,600 hectares, which was created to conserve one of the last large and undeveloped flood plains in Central Europe.
Gerald Adelsgruber, head of the Austrian profit centre in Overhead Line Construction at EQOS Energie: “Lines traversing such sensitive areas require extremely diligent and precise planning in order to take a variety of factors into consideration – from soil conditions to the breeding seasons of rare bird species in the national park. From these factors, particularly stringent requirements for nature conservancy and the protection of historic monuments are derived. As a result, project planning is executed in close coordination with all authorities and requires particularly long-term planning efforts.”
Groundwater also plays a significant role during project implementation, specifically during foundation work. However, Adelsgruber’s teams are perfectly familiar with this requirement: Based on a large number of international projects, they are very experienced in taking measures to safely lower the water table. “An ingress of groundwater can negatively impact construction progress. Therefore, we ensure that groundwater levels in the excavation pit be kept at the same level, e.g. by constructing a dewatering system and additionally securing the excavation pit,” Adelsgruber added.