Final court confirmation for Salzburg Line

21.10.2020

From the first submission of the project to the Salzburg state government in September 2012 until the approval of the construction of the second section of the Salzburg Line (“Salzburgleitung”) by the court of last instance, the beautiful Austrian state of Salzburg has certainly seen many sunsets. The Austrian transmission system operator (TSO) APG is now all the more content with the definite legal groundwork for Austria’s most important infrastructure project. Although the legally valid building permit for the Salzburg Line had already been granted by the Austrian Federal Administrative Court in March 2019, there were still final legal details in connection with the project, which the Supreme Administrative Court has now clarified on 20 October 2020, thus confirming the permit.

The new 380kV overhead line will replace the old 220kV line from the 1960s and will be capable of transporting seven times more electricity than the current line. To improve supply security in the city of Salzburg, the first 46-kilometre section of the Salzburg Line from the St. Peter grid node near the German border to the newly constructed Salzburg substation near Elixhausen was already commissioned in January 2011. The second section of the Salzburg Line, from Elixhausen to the Tauern grid node near Kaprun, will now close the western gap in the Austrian “380kV Ring”. This ring-shaped extra-high voltage grid is the backbone of the national electricity supply and crucial for the integration and transmission of renewable energies.

The total length of the new line, which has 449 pylons, is 128 kilometres. However, as old lines will be dismantled when the Salzburg Line is completed and some of them will run jointly on the new line, there will be 229 fewer masts in Salzburg than before. Commissioning of the Salzburg Line is planned for the year 2025, dismantling will be completed by 2026. “With €890m to be invested, the Salzburg Line is by far the most important investment project in the Austrian electricity infrastructure. Of the approx. €350m that APG is investing in the expansion of the electricity grids this year, the Salzburg Line alone has a share of €125m for the domestic economy,” comments Gerhard Christiner, CTO of the Austrian TSCNET shareholder, who also praised the day of the court ruling as a “good day for the energy transition and for the secure supply of electricity in Salzburg and Austria”.

The Austrian Supreme Administrative Court has definitively confirmed the construction permit for the 380kV Salzburg Line of APG (picture: Martin Lugger / APG)

Linkup
> See APG press release, in German (html)

See article on single page

Combined Grid Solution inaugurated

20.10.2020

On 20 October, the world’s first hybrid offshore interconnector was ceremoniously put into operation: the Danish-German Combined Grid Solution (CGS). This interconnector in the Baltic Sea links the transmission grids of two countries via national offshore wind farm grid connections. For this purpose, two submarine cables with a length of merely 25 kilometres and a capacity of approx. 200MW each were laid between the offshore transformer platforms of the German wind farm Baltic 2 and the Kriegers Flak wind farm in the Danish part of the Baltic Sea, which is currently under construction. The CGS – a joint project of TSCNET shareholder 50Hertz, one of the four German transmission system operators (TSOs), and TSCNET customer Energinet, the TSO from Denmark – thus not only connects the platforms with each other but also the existing onshore connections of the wind farms. This allows the transmission of offshore wind power to Denmark or Germany and also cross-border electricity trading.

The official opening ceremony, which took place on site in the German capital of Berlin as well as digitally, was attended by Peter Altmaier, German Federal Minister for Economic Affairs and Energy, Dan Jørgensen, the Danish Minister for Climate, Energy and Utilities, as well as Kadri Simson, EU Commissioner for Energy. With their appearance, these high-ranking political representatives acknowledged the CGS as a technical innovation with model character for future offshore power grids. The hybrid nature of CGS is that it is the first electricity interconnector between two countries, that not only provides capacity for electricity trading, but also transports offshore wind energy onshore – in both directions. The costs of the binational EU-funded project amount to around €300m.

A technical obstacle had to be solved in the realisation of CGS: Because the transmission grids in eastern Denmark and Germany do not operate synchronously, it was necessary to install a back-to-back converter at the 50Hertz substation in Bentwisch near the port city of Rostock in the federal state of Mecklenburg-Western Pomerania. The device converts the incoming AC into DC and immediately back. Only in this way is it possible for electricity to flow smoothly from Denmark to Germany and vice versa. But CGS has not only hardware but also software components. The central digital control unit of the system is the Master Controller for Interconnector Operation (MIO), located in the 50Hertz control centre near Berlin. The MIO balances market requirements with offshore electricity production, which depends on wind conditions in the Baltic Sea. Its main function is to ensure optimum use of the CGS while preventing any overload of the line and the operating facilities in the substation.

Stefan Kapferer, CEO of 50Hertz, commented at the inauguration: “With this project, 50Hertz and Energinet are pioneering the efficient integration of offshore wind farms into the cross-border European electricity market. It offers us several effective options to balance the frequency and voltage of our transmission grids at all times, to deal with the integration of renewable energy sources with more flexibility and to increase the stability of the overall system.” Thomas Egebo, CEO of Energinet, added: “The CGS is not only a very important milestone in reaching Denmark’s ambitious goal of a 100 percent green power system in 2030. The groundbreaking project also delivers an important building block for decarbonising the rest of the society.”

The Danish-German Combined Grid Solution has been ceremoniously put into operation (illustration uses photos of 50Hertz, one of which shows Minister Altmeier)

Linkup
> See 50Hertz press release (html)
> See Energinet news release (html)
> Watch CGS inauguration film (YouTube)

See article on single page

Improving biodiversity for submarine cabling

15.10.2020

Looking at the big picture – the energy transition and the achievement of the European climate targets – there is no alternative to expanding offshore capacity for the generation and transmission of North Sea wind power. For that reason, both the Dutch and German governments have set ambitious targets for offshore expansion, which the Dutch-German transmission system operator (TSO) TenneT is gradually implementing and has even exceeded for its German North Sea control area. In the individual case, however, each offshore construction and operational measure obviously has an impact on the valuable North Sea and Wadden Sea ecosystems. As TenneT strives to apply and monitor nature-friendly solutions in all of its offshore grid projects, the TSO is now conducting pilot tests with stone coverings of submarine cable intersections.

When the TSCNET shareholder lays submarine cables, e.g. currently for the high-voltage connection of the Hollandse Kust (zuid) wind region, the cables sometimes cross with existing oil and gas pipelines. In such cases, the cables protrude above the seabed and are usually covered with a layer of granite to protect them. To replace granite with alternative solutions that promote biodiversity, TenneT has launched a pilot project in collaboration with the offshore specialist company Van Oord. In this project, different types of stones are deposited at cable crossings to investigate which of these stimulates biodiversity best. In total, the pilot involves twelve locations in the North Sea. In the case of the first six, recently laid submarine cables already cross existing oil and gas pipelines. Another six intersections will follow during the construction of the Hollandse Kust (Zuid) connection in 2021.

On 14 October, the different stones were loaded onto Van Oord’s special vessel to be placed at the cable intersections in the coming weeks. Among them are small calciferous stones from a marble quarry, which are placed at three of the six cable intersections. Comparison with the other three intersections without calciferous stones will allow to assess the difference in the type of marine life developing at these intersections. “Our expectation is that the calciferous stones will ensure that various benthic species will find it easier to nest here and that a different habitat will emerge at these sites. Over the years, ‛artificial reefs’ can emerge at these sites in the North Sea, where plants and small creatures can settle,” explains Saskia Jaarsma, Head Offshore Developments and Large Projects Offshore at TenneT.

TenneT has launched a pilot project to promote biodiversity at submarine cable intersections (picture: Van Oord)

Linkup
> See TenneT press release (html)

See article on single page

Successful test run of SINCRO.GRID’s VVC function

07.10.2020

SINCRO.GRID is a smart grid project of the two transmission system operators (TSOs) HOPS from Croatia and ELES from Slovenia. With SINCRO.GRID, the two TSCNET shareholders are responding to the increasing lack of flexibility and reactive power in the transmission system, which in Croatia and Slovenia, as in many parts of Europe, results from the increasing integration of decentralised, volatile renewable energy sources (RES). Two distribution system operators (DSOs) from the respective countries are also involved in the European Project of Common Interest (PCI). The aim of the project partners is to optimise grid efficiency via advanced technologies and innovative data processing, including compensation devices, a dynamic thermal rating system, a battery power storage system, and a virtual cross-border control centre.

As HOPS reports, an important step has been taken towards the establishment of the binational SINCRO.GRID control centre, whose prime task is to integrate reactive power compensation devices in Croatia and Slovenia into a joint operation to fully exploit their synergy potential. The centre will thus enable voltage control and loss optimisation in transmission systems, better control and forecasting of electricity generation from RES, and the participation of RES in the provision of ancillary services.

On 30 September 2020, the SINCRO.GRID Q-U system with Volt Var Control (VVC) function was operated for the first time in fully automatic closed loop for four hours without any human intervention. All calculated VVC data were automatically sent by the Q-U system to seven transformers in three HOPS substations, optimising the transmission network in north-western Croatia. After successful testing in fully automatic mode, the test was continued in semi-automatic mode with transformers and two generators in one power station. The information and experience obtained from the test run will be used for the further analysis of the Q-U system and its application to the whole Croatian transmission system and finally for the implementation of the HOPS-ELES virtual cross-border control centre.

HOPS has carried out a successful test run of the Q-U system with VVC function within the SINCRO.GRID project (picture: HOPS)

Linkup
> See HOPS press release, in Croatian (html)
> See SINCRO.GRID news (html)

See article on single page

Wilhelmshaven-Conneforde line put in operation

05.10.2020

With the Wilhelmshaven-Conneforde line, the Dutch-German transmission system operator (TSO) TenneT has commissioned an important grid expansion project for the German and European energy transition. The 380kV line from the new substation Fedderwarden near Wilhelmshaven on the German North Sea coast to the Conneforde substation in Ammerland, both in the federal state of Lower Saxony, is not only crucial for the transmission of mainly wind power and electricity from regional generators, but also for strengthening security of supply in northern Lower Saxony. Furthermore, it represents a novelty for the TSCNET shareholder in terms of technical implementation: “With this new line, we have put into operation the first pilot project with two underground cable sections in three-phase technology and connected it to the meshed power grid in Germany,” explained Tim Meyerjürgens, COO of TenneT.

The commissioning ceremony on 2 October 2020 in Fedderwarden was attended by representatives from politics, including Andreas Feicht, State Secretary at the German Federal Ministry for Economic Affairs, and Energy and Olaf Lies, Minister for the Environment, Energy, Construction, and Climate Protection of Lower Saxony. The new line is only about 30 kilometres long, but – together with the new construction of the Fedderwarden substation – “of great importance for the entire European electricity trade”, commented Olaf Lies. The Minister was impressed by TenneT’s latest milestone in the energy transition. State Secretary Feicht referred to the newly gained potential for integrating large amounts of wind power into the German electricity market and the technical relevance of the pilot project: “Knowledge obtained in such pilot projects about the construction and operation of the technology will be of great benefit for further power grid expansion in the future.”

The line project was successfully completed after less than two years of construction. Almost 5 kilometres of the line were implemented as underground cables. However, even if TenneT can be satisfied with what has been accomplished so far and is strongly committed to expanding the transmission of green electricity throughout its entire grid area, Meyerjürgens sees a need for further action, especially in view of the increasing offshore wind volumes: “Still, we already see today a further demand for expansion in the Wilhelmshaven and Friesland region.”

TenneT commissioned the new Wilhelmshaven-Conneforde line (picture: TenneT)

Linkup
> See TenneT press release, in German (html)

See article on single page

TenneT commissions North German grid node

02.10.2020

The town of Wilster is located about 10 kilometres north of the Elbe river in the German federal state of Schleswig-Holstein, which falls within the control area of the Dutch-German transmission system operator (TSO) Tennet. Schleswig-Holstein is of eminent importance for the generation of wind power. In Wilster, after a four-year construction period, the TSCNET shareholder commissioned the renewed Wilster/West substation on 1 October, a significant grid node for the energy transition in the north and beyond. This is because the so-called Westküstenleitung (West-Coast-Line), the NordLink interconnector, which directly links the electricity markets of Germany and Norway, are converging here – and later also the SuedLink “electricity highway” for the transmission of green electricity to the German consumption centres.

For the two high-voltage direct current (HVDC) transmission projects NordLink and SuedLink, the capacity of the former Wilster/West substation was no longer sufficient. An extension of the switchgear was necessary to exclude impermissible load flows and guarantee the short-circuit resistance required in future. Thus, a new 380kV switchgear was built on the ground of the former 380kV substation and the new construction now replaces the old substation on the same site. Furthermore, the connection facilities for the converter stations of SuedLink and NordLink had to be provided. And finally, a 110kV switchgear was installed, which enables the dismantling of the 220kV switchgear in the near substation Itzehoe-West.

“This substation is a central hub for electricity transmission from north to south,” explains TenneT’s COO Tim Meyerjürgens. “Here, electricity from renewable sources is fed into the grid and distributed to regions with high consumption. The Wilster area is of outstanding importance for the energy transition. Because in the grid area between Wilster, Brokdorf, Itzehoe, and Brunsbüttel, three new extra-high voltage lines from TenneT converge: the Westküstenleitung, NordLink, and later also SuedLink.”

TenneT has put into operation the new substation Wilster/West (picture: TenneT)

Linkup
> See TenneT press release, in German (html)
> Watch video on the construction and commissioning of Wilster/West, in German (YouTube)

See article on single page

€30m for secure electricity supply in East Tyrol

28.09.2020

Since autumn 2016, the Austrian transmission system operator (TSO) APG has been gradually renewing the 220kV switchgear at the Lienz substation in the eastern part of the Austrian state of Tyrol. The substation in Nußdorf-Debant near the medieval town of Lienz is of particular importance for the region’s electricity supply, as it is the only feed-in point from APG’s 380/220kV high-voltage grid for the whole of East Tyrol. For this reason, the TSCNET shareholder is pursuing an extensive investment programme of €30m for the substation to improve the electricity supply in East Tyrol and to enhance the integration of green electricity into the Austrian transmission grid.

The upgrade project also includes a new 380/220kV transformer. Due to its dimensions, it was transported by rail in three individual parts of 167 tonnes each from the Styrian Siemens plant in Weiz via an individual siding directly to the substation. Now the last part has arrived in Lienz and has been placed on its foundation. The total weight of the finished system is 816 tonnes. The state-of-the-art device will be operational from June 2021 and APG expects the upgrade of the entire substation to be completed in autumn 2022.

The Lienz transformer is of supra-regional relevance as it increases system security in all of Austria and also facilitates the country-wide use of climate-friendly wind energy. This is because the transformer strengthens the connection between the pumped storage power plants in the west of the country and the wind turbines in the east. With its investments, APG thus supports the national goal of covering 100% of the electricity consumption in Austria with green electricity by 2030. Company spokesperson Christoph Schuh comments: “All APG grid expansion, modernisation and maintenance projects are crucial for reaching Austria’s climate targets and indispensable cornerstones for guaranteeing the republic’s security of supply.”

APG is investing €30m in the upgrade of the Lienz substation in East Tyrol (picture: Michael Stabentheiner / APG)

Linkup
> See APG press release (html)

See article on single page

Network Agency decides on southern routing of SuedLink

25.09.2020

700 kilometres of underground cable to be laid and an investment volume of around €10bn – this makes the 525kV line SuedLink the largest and probably most important individual project of the energy transition in Germany. The exclusive use of underground cables in the project is politically specified to increase the acceptance of the project by the population: For only if one succeeds in effectively connecting the windy regions of northern Germany with the centres of consumption in the industrially highly developed south and west via such “electricity highways” as SuedLink, the German – and European – climate targets can be achieved.

SuedLink is jointly implemented by the two TSCNET shareholders TenneT, the Dutch-German transmission system operator (TSO), and TransnetBW, the TSO from southwest Germany. The project is making step-by-step progress in the regulatory, planning, and implementation areas. This year, for example, regional planning offices have already been set up and the contracts for the cables awarded. Now the competent government authority, the Federal Network Agency (Bundesnetzagentur), has decided on the southern section between the Lower Franconian Arnstein near Schweinfurt and the Großgartach substation in the Stuttgart Metropolitan Region (SuedLink section E). This 137 kilometre long section runs through the control areas of both TSOs involved.

The Bundesnetzagentur’s decision largely follows the proposal by TenneT and TransnetBW, according to which the Würzburg metropolitan area is largely bypassed in the west. The proposal of the two TSOs had already incorporated the results of the application conferences and requirements of the Bundesnetzagentur. The last 16 kilometres to the Großgartach substation are a special construction feature. Here an existing salt mine is to be used for an underground course of the cable project. This increases construction costs, but these are outweighed by other benefits, in particular the reduced impact on the environment and residential areas. After the completion of the federal sectoral planning for the SuedLink section E, planning approval procedures are to follow which will determine the exact route of the line within the corridor and the technical implementation.

The German Federal Network Agency has decided on the southern section of the SuedLink power line, a joint project of TenneT and TransnetBW (picture: TenneT)

Linkup
> See press release by Bundesnetzagentur, in German (html)

See article on single page

Deep Dig-It starts work for Hollandse Kust (zuid) grid

24.09.2020

Hollandse Kust (zuid), an offshore wind area in the Dutch North Sea, is located a good 20 kilometres off the coast of the Dutch province of Zuid-Holland. The Dutch-German transmission system operator (TSO) TenneT is installing the related offshore grid to connect the new offshore wind farms in the area via two offshore platforms and submarine cables to the onshore high-voltage substation that is being built in the Maasvlakte industrial and port area. The jacket for the first of these two offshore platforms has recently been installed and the offshore connection project is now making further progress with the start of the laying of the submarine cables on 22 September.

Four 220kV AC cables with a total length of 42 kilometres each are to be installed in the seabed, of which the first two to the Alpha platform will be laid this year. The other two to the Beta platform will follow in 2021. First, the two cables were brought ashore to the planned Maasvlakte substation via direct drilling. Thereupon the TSCNET shareholder started the marine installation, with the first ten kilometres of the route from the coast at Maasvlakte being extremely challenging. Over this distance, the cables cross the entrance to the port of Rotterdam – Europe’s busiest cargo port – and thus need to be buried more than 5.5 metres deep. For this purpose, the contracted specialist company Van Oord uses its Deep Dig-It trencher, an enormous remote-controlled trencher.

The Deep Dig-It is one of the largest and most powerful devices in its class. The trencher weighs 125 tonnes, is more than 17 metres long, well over 8 metres high, and 11 metres wide. With its enormous power it can bury cables deeply even in very hard ground. The trencher is controlled from an offshore installation vessel equipped with a crane to lower and lift out the high-performance machine. The Deep Dig-It moves unmanned over the seabed and creates a deep trench for the cables by liquefying the seabed. Simultaneously, the Deep Dig-It inserts the cables into the trench and seals the seabed afterwards. With work progressing well, Tennet expects the 1,400MW Hollandse Kust (zuid) grid connection to be completed in 2022.

TenneT has started the laying of submarine cables for the Hollandse Kust (zuid) grid connection (picture: Van Oord)

Linkup
> See TenneT press release (html)
> Watch TenneT video of the Deep Dig-It at work (YouTube)

See article on single page

Cooperation to link offshore wind farms

22.09.2020

Realising the full potential of offshore wind energy in the North Sea will be crucial for the decarbonisation of the European economy and society. The transmission system operators (TSOs), whose control areas border the North Sea, are aware of this, including the Dutch-German TSO TenneT and National Grid from the UK. Both the Netherlands and the UK have set ambitious targets for their respective development of wind capacity in the North Sea. However, to achieve large-scale growth in offshore wind energy, significant amounts of new infrastructure and close cooperation between the countries around the North Sea will be essential.

On 22 September, TenneT and National Grid announced a cooperation agreement to examine the feasibility of interconnecting Dutch and British wind farms to the energy systems of both countries via submarine cables. The announcement is following a recent decision by the Dutch government to secure the first 2GW offshore transmission grids for high-voltage direct current (HVDC) in the Netherlands for the IJmuiden Ver wind farm zone, located some 80km off the Dutch north-west coast. Under the cooperation agreement, TenneT and National Grid will explore the development of a multi-purpose interconnector (MPI) to simultaneously connect up to 4GW of Dutch and British offshore wind energy between the two national electricity systems, thereby creating an additional 2GW of interconnection capacity.

By connecting to both systems, the MPI will allow the use of free transmission capacity for electricity trade between the two countries, thus improving the utilisation of offshore infrastructure – and possibly decreasing the need for additional infrastructure. This will also reduce the environmental impact on coastal communities compared to the current approach of separately developing and connecting interconnectors and wind farms. The two TSOs intend to have defined a “pathfinder project” by the end of 2021 with the aim of creating an operational system by 2029.

Manon van Beek, CEO of TenneT, comments on the agreement: “TenneT has been at the forefront of developing multi-purpose interconnection to enable the large-scale growth of offshore wind in the North Sea. This agreement allows us to work with National Grid in the North Sea to develop innovative infrastructure that uses every spare electron of offshore wind generation to reach our decarbonisation targets.”

TenneT has concluded an agreement with National Grid to investigate the interconnection of UK and Dutch offshore wind farms (exemplary picture: TenneT)

Linkup
> See TenneT press release (html)

See article on single page