Worldwide unique equipment for TransnetBW substation

18.07.2020

European transmission system operators (TSOs) respond to the increasing need for grid regulation – resulting from the growing share of volatile renewable energies and the proceeding shutdown of conventional power plants – with reactive power compensation measures, such as the installation of shunt reactors. Shunt reactors are absorbers of reactive power and support security of supply and system management by keeping the grid voltage within the specified range, especially during low load periods. They thus stabilise the power grids and increase the energy efficiency of the transmission system.

In the Stuttgart-Mühlhausen substation, TransnetBW, one of the four German TSOs, has commissioned a variable shunt reactor for reactive power compensation developed especially for the TSCNET shareholder. Up to now in the TransnetBW control area, shunt reactors have only been used in the 110kV grid. Compared to customary reactors, the new system provides a much more precise control of the grid voltage. The 360-tonne reactor has a control bandwidth of 50-250MVAr in 33 stages and a permanently permissible system voltage of 440kV. With these specifications, the Mühlhausen shunt reactor is not only a novelty for TransnetBW, but for the entire energy sector.

TransnetBW has commissioned a state-of-the-art shunt reactor in the Stuttgart-Mühlhausen substation (symbolic picture: Siemens)

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> See TransnetBW press information, in German (html)

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Successful start of FCR auctions

01.07.2020

The cooperation on regional procurement and exchange of frequency containment reserve (FCR) is a voluntary initiative of eight transmission system operators (TSOs): the six TSCNET shareholders 50Hertz, Amprion, and TransnetBW from Germany, APG from Austria, Swissgrid from Switzerland, and the Dutch-German TSO TenneT, as well as Elia from Belgium and the French TSO RTE. The FCR project is the first regional cooperation for a common market based on the methodology for the exchange of control reserves set out in the EU Guideline on Electricity Balancing. Within the scope of a cooperation model with Amprion, the Luxembourg TSCNET customer Creos is also involved.

The next milestone in the development of the largest European market for primary balancing power reserve has now been reached, as the first D-1 auction for FCR with 4-hour products was successfully conducted on 30 June 2020. This means, the FCR cooperation reduces the product length from one day to four hours and thus the market for primary balancing power is brought closer to real time.

Due to stronger competition between service providers and technologies, the joint auction allows TSOs to procure FCRs at minimum cost to end-users while offering a large common market for all providers of balancing services. It also increases the market attractiveness for short-term flexibility, limits price volatility and improves the security of grid operation by executing cross zonal procurement of FCR. The FCR market, already the largest in Europe, will be extended to western Denmark and Slovenia in the first quarter of 2021, so that with Energinet and ELES two further TSCNET shareholders will broaden the project.

The FCR cooperation successfully conducted the first D-1 auction for FCR with 4-hour products 

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> See Swissgrid news release (html)

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Contracts for 525kV SuedLink cables

29.06.2020

SuedLink is evolving in major steps this year. The DC line – realised jointly by the two TSCNET shareholders TenneT, the Dutch-German transmission system operator (TSO), and TransnetBW, the TSO from southwest Germany – is the largest and probably most important single project of the energy transition in Germany. With around 700 kilometres of underground cable to be laid and an investment of around €10bn, SuedLink will connect the windy regions of northern Germany with the centres of consumption in the industrially highly developed south and west. In February 2020, the Federal Network Agency (Bundesnetzagentur) initiated the plan approval procedure for the first SuedLink sections, in May the orders for the regional planning offices were placed and now TenneT and TransnetBW have awarded the contracts for the plastic-insulated 525kV underground cables – in parallel with the ongoing approval procedures.

NKT and Prysmian PowerLink have eventually been selected as providers for the SuedLink cables, with a total order value of approximately €2bn. The contract comprises design, manufacture, supply, laying of the underground cables, further installation work, and the final high-voltage testing of the cable system. Both companies have demonstrated their expertise in numerous international connection projects on and offshore, and both have proven the quality of their cables in extensive prequalification tests with several cable manufacturers in a multi-year test phase. They were also commissioned for the German affiliate project, SuedostLink, by the two TSOs 50Hertz and TenneT.

TenneT and TransnetBW chose plastic-insulated underground DC cables with a voltage level of 525kV because they transmit more power compared to a 320kV solution and only require half as many cables. Less transmission loss and less civil engineering work translate into both, financial benefits for the TSOs and minimal environmental impact. TenneT Managing Director Tim Meyerjürgens comments: “In the future, SuedLink will form the backbone of the energy transition in Germany. With the commissioning of the DC ground cables, we are now moving from the planning stage to the realisation of this important power link.” Dr. Werner Götz, Chairman of the TransnetBW Executive Board, adds: “We are very happy to be able to apply this innovative and environmentally benign technology for SuedLink.”

TenneT and TransnetBW awarded the contracts for the 525kV DC underground cables for the SuedLink power highway (picture: TenneT)

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

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Redispatch harmonisation in Germany

26.06.2020

Up until now, redispatch measures between the four German transmission system operators (TSOs) – 50Hertz, Amprion, TenneT, and TransnetBW – and the operators of power plants and storage facilities with a capacity of more than 10MW have been carried out on the basis of IT tools specific to the particular TSO control area. In order to align the individual procedures nationwide, the four TSCNET shareholders on 26 June successfully put the first component of their joint redispatch platform into operation, the “Redispatch Settlement Server” (“Redispatch-Abwicklungsserver” – RAS).

The German electricity market is increasingly characterised by volatile generation and RAS is an instrument to initiate redispatch measures both faster and more flexibly. With harmonised data formats and processes, the redispatch platform, of which the RAS is the first part, provides the basis for the integration of renewable energies into the existing redispatch processes, that is, for future-proof congestion management. In concrete terms, RAS allows TSO control centres to monitor and process all relevant power plant interventions. As a result, TSOs can coordinate their redispatch decisions and activities more efficiently. Moreover, the central management introduces frictionless settlement and transparency processes.

The second part of the redispatch platform is the “Redispatch Determination Server” (“Redispatch-Ermittlungsserver” – RES). RES will complement or replace existing forecasting tools for expectable grid situations such as imminent bottlenecks. It will identify those options for action that are compliant with the regulations and most cost-efficient. Based on RES calculations, TSOs can resolve both predicted and existing grid congestions more efficiently than today. RES is scheduled to go into operation in 2021.

The four German TSOs have succesfully launched RAS, a joint server for redispatch settlement

Linkup
> See 50Hertz press release (html)
> See Amprion press release, in German (html)
> See TenneT press release, in German (html)
> See TransnetBW press release, in German (html)

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SuedLink: Regional planning offices take up work

10.06.2020

With around 700 kilometres of underground cables to be laid and around €10b to be invested, the SuedLink 525kV line is the largest and probably the most important individual project of the energy transition in Germany. By connecting the windy regions of northern Germany with the consumption centres in the industrially highly developed south and west, “power highways” such as SuedLink are indispensable for achieving Germany’s and Europe’s climate goals. SuedLink is realised jointly by the two TSCNET shareholders TenneT, the Dutch-German transmission system operator (TSO), and TransnetBW, the TSO from southwest Germany.

SuedLink has just taken the next big step: After the Federal Network Agency (Bundesnetzagentur) initiated the plan approval procedure for the first sections in February 2020, the two TSOs have now awarded the contracts for the regional planning offices, which are responsible for the detailed planning of the underground DC connection. These offices, some of which have already been involved in the previous SuedLink planning, take care of all operational tasks – initially in the context of the approval procedure, and later also in the supervision of construction. This includes, among other things, route mapping, construction logistics, environmental planning, and awarding of contracts for civil engineering work. On special topics such as soil investigations, they cooperate with local companies.

The overall project was divided into nine planning sections for the award of contracts. After an extensive bidding competition, a total of four companies were awarded the contract for the three northern sections under the responsibility of TenneT and the six southern sections under the responsibility of TransnetBW. TenneT Managing Director Tim Meyerjürgens explains: “The offices are now preparing the detailed planning for the routing and are taking a very close look at the conditions on site.” This will help the TSOs to accurately develop appropriate routing proposals. Dr. Werner Götz, Chairman of the TransnetBW Executive Board, adds that, due to their local presence, the offices can optimally consider the regional conditions for the detailed planning. “They are intended to discuss the proposals together with the project developers in a close dialogue with the owners and land managers concerned and to review their advice when preparing the approval documents.”

TenneT and TransnetBW awarded the contracts for regional planning offices for the SuedLink power highway (picture: TenneT)

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

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Luxembourg integrated into FCR cooperation

01.06.2020

Eight central European transmission system operators (TSOs) cooperate in the regional procurement and exchange of Frequency Containment Reserve (FCR). Their joint FCR project is the first regional cooperation in Europe to implement market harmonisation in accordance with the EU Guideline on Electricity Balancing. The participating TSOs are APG, 50Hertz, Amprion, TransnetBW, and Swissgrid – the Austrian, German and Swiss TSCNET shareholders –, the Dutch-German shareholder TenneT as well as the Belgian TSO Elia and the French TSO RTE. It is intended to extend the joint FCR procurement towards western Denmark, so that the central European TSOs are supplemented by Energinet from Denmark as a non-active member.

Luxembourg was missing in the cooperation so far, but cross-border primary control reserve (PCR) between Germany and Luxembourg is now also possible: Since 1 June 2020, balancing service providers (BSPs) from Luxembourg are participating in the joint tender for FCR cooperation. For this purpose, the TSO Amprion, whose German control area is bordering the Grand-Duchy, and the Luxembourgian TSCNET customer Creos have developed a cooperation model. Under this model, Amprion assumes the role of the connecting TSO, carries out the prequalification of the BSPs, concludes the framework agreement for PCR, and takes over the settlement with the BSPs from the Creos control area.

Since Amprion and Creos operate a joint load-frequency-control area, a pooling of technical units within this common area is permissible. Thus, a pool can include Luxembourgian as well as German units that provide balancing services. This means that a BSP may combine generation units or controllable consumer loads from both countries and offer them collectively on the PCR market.

The central European FCR cooperation was extended to Luxembourg (picture: Cedric Letsch)

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> See Amprion press release, in German (html)

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Generation adequacy in the CWE region within standards

22.05.2020

The Pentalateral Energy Forum (PLEF) provides the framework for regional cooperation in Central Western Europe (CWE) to improve electricity market integration and security of supply. The initiative aims to give political backing to a process of regional integration towards a European energy market. As far as the concrete implementation of impulses from the initiative is concerned, eight transmission system operators (TSOs) of seven countries cooperate in the PLEF, including the TSCNET shareholders APG from Austria, Amprion and TransnetBW from Germany, Swissgrid from Switzerland, the Dutch-German TSO TenneT, and TSCNET client Creos from Luxembourg as well as the Belgian TSO Elia and RTE from France.

The PLEF is subdivided in so-called Support Groups, e.g. covering work on market integration (SG1) and on security of supply (SG2). Within the scope of the SG2 group, the eight TSOs have worked out the third edition of the Pentalateral Generation Adequacy Assessment (PLEF GAA 3.0) and have just published a corresponding report, which summarises the main findings in 71 concise pages. The study, which examines the adequacy of electricity generation in the PLEF region up to the medium-term time horizon (2025), can be considered as significant result of TSO cooperation at regional level.

The main findings are that, under base conditions, sufficient production capacity is available, so that a breach of reliability standards is not to be expected and the adequacy of production in the CWE region will be up to standard by 2025. However, adequacy simulations have also shown that adequacy risks can occur. The electrical system may be exposed to specific situations in which the system safety is under strain. Additional unforeseen events in such situations can put even greater pressure on daily system operation, which may require the activation of special measures.

The eight TSOs cooperating in the PLEF have published their joint report on regional generation adequacy assessment in Central Western Europe

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> See TenneT press release (html)
> Open PLEF GAA 3.0 Report (pdf, 2.94MB)

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Demolition makes room for DC substation

14.05.2020

After TransnetBW, the transmission system operator (TSO) from the south-western German state of Baden-Württemberg, was granted building permit for the ULTRANET substation on the site of the former Philippsburg nuclear power plant in March 2020, the way is now finally clear for its construction. At 6.05 in the morning of 14 May 2020, the two cooling towers on the site of the former power plant were detonated. Now the necessary construction space of around 100,000m² is created. The Philippsburg plant was shut down completely on 31 December 2019 and the building construction of the ULTRANET substation is scheduled to start in the third quarter of 2020.

Since the future Philippsburg substation is the southern end point of the supra-regional high-voltage direct current (HVDC) line ULTRANET, it will be one of the most important energy hubs in Germany’s soon-to-be energy landscape. ULTRANET, a European Project of Common Interest (PCI), is jointly implemented by the two TSCNET shareholders TransnetBW and Amprion. It will transfer wind energy generated in the northwest of Germany to the more industrially developed southwest with low losses. In Philippsburg, the transmitted DC will be converted into AC and distributed regionally. In the reverse case, the substation enables the conversion of AC to DC, e.g. to transport excess photovoltaic power from the south to the north.

The fact that the “green” substation will feed renewable electricity into the transmission system instead of nuclear power is a representative of the entire German energy future. “The construction of our DC substation on the site of the cooling towers of the nuclear power plant is a visible sign and symbol of the progress of the energy transition,” comments Dr. Werner Götz, Chairman of the TransnetBW Executive Board. “In future, renewable electricity will flow from the Philippsburg site through the TransnetBW transmission grid to the entire region. Thus, as the TSO in Baden-Württemberg, we ensure that our country will have the electricity it needs even in a future without nuclear power and coal.”

With the cooling towers of the Philippsburg nuclear plant detonated, TransnetBW will begin construction of the ULTRANET substation (picture: screenshot taken from video “Sprengung der Kühltürme des Atomkraftwerks Philippsburg”, in German, YouTube channel of German newspaper “Die Rheinpfalz“)

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> See TransnetBW press release, in German (html)

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Amprion invests €1bn in 525kV cables for A-Nord

12.05.2020

The DC transmission line A-Nord represents the northern part of Corridor A, which is one of the main axes of the German energy transition. The 300-kilometre line from the port city of Emden at the Dollart Bay to Osterath in the Lower Rhine region is being implemented by TSCNET shareholder Amprion, one of the four German transmission system operators (TSOs). With a capacity of 2GW, A-Nord will transport wind power from the North Sea to the centres of consumption in the Rhineland and Ruhr district. The southern part of Corridor A is the Ultranet line, which is being implemented jointly by Amprion and further TSCNET shareholder TransnetBW.

Like other large-scale German DC interconnection projects that are essential to the country’s low-carbon energy future, A-Nord will be realised via underground cabling. The transmission capacity of 2GW will be achieved by 525kV cables whose efficiency significantly reduces the environmental impact but requires a special insulation material and highly competent suppliers. After extensive technical tests, Amprion has now contracted the underground cables for A-Nord. The specialist companies Prysmian Powerlink and Sumitomo Electric Industries are each supplying one cable system for A-Nord. The manufacturers will produce the systems concurrently with the construction of the line, scheduled to start in 2023.

Dr Hans-Jürgen Brick, CEO of Amprion, comments in view of the challenges to achieve a sustainable energy future: “It is essential that the grid expansion continues to progress swiftly.” Dr Klaus Kleinekorte, the TSO’s CTO, adds: “With this assignment, Amprion once again demonstrates that we are a driving force for innovative developments.”

Amprion has awarded contracts for the 525kV underground cables for the A-Nord power highway (picture: Amprion / Lutz Kampert)

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> See Amprion press release, in German (html)

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TransnetBW presents foresight on the power grid 2050

24.04.2020

TransnetBW, one of the four German transmission system operators (TSOs), presented its study “Electricity Grid 2050” (“Stromnetz 2050”) in a Twitter online event on 22 April. The study, in which the TSCNET shareholder drafts a scenario for a largely climate-neutral energy system in Germany and Europe, is now available to anyone interested. The TSO outlines a target vision of the German energy system after the climate protection and energy transition goals have been achieved and indicates, which requirements must be met at system and grid level in a sustainable energy future.

The live-stream presentation of the study, followed by an online question and answer session, was hosted by Michael Jesberger, member of the TransnetBW executive board, together with Christian Schorn, Head of Asset Management & Operations at TransnetBW, Dr. Felix Matthes, research coordinator for energy and climate policy at the Öko-Institut (Institute for Applied Ecology, a non-profit, private-sector environmental research institute) and Helmfried Meinel, Ministerial Director of the Baden-Württemberg Ministry of the Environment, Climate Protection and the Energy Sector.

“The energy transition is progressing, and climate policy goals have been set: By 2050, the energy system in Germany should be largely climate-neutral. The transmission grid plays a decisive role in this,” explained Michael Jesberger. “With the study ‘Electricity Grid 2050’, we are revealing how a greenhouse gas-neutral energy system can look like.” By considering the time after the climate targets are reached, the study extends the time frame beyond the requirements of national planning guidelines. “With this approach of thinking the energy transition from the end, the study provides a new basis for discussion of the methodological refinement of the German Network Development Plan (NEP), which so far only plans the transmission grids ten to 15 years in advance,” stated Christian Schorn.

According to the study, it is necessary to increase the installed capacity of wind energy and photovoltaic systems by three to four times compared to 2018 to achieve the energy and climate policy goals by 2050. In addition, the heating and transport sector will have to be largely electrified, which will lead to an increase in net electricity demand of over 50%. This will only be partially compensated by the integration of the European internal electricity market and the increasing cross-border electricity trade. Hence, the transmission grid planned in the NEP is not sufficient to achieve the energy goals. The integration of renewable energies requires a set of grid extension measures that goes far beyond the previous plans. The study “Electricity Grid 2050” offers a new level of detail of the future grid and is intended to stimulate a fruitful debate.

TransnetBW has presented an in-depth study on the future electricity infrastructure (picture of Michael Jesberger, Managing Director at TransnetBW: screenshot of the study’s online presentation)

Linkup
> See TransnetBW press release, in German (html)
> Visit Stromnetz 2050 website, in German (html)
> Download Stromnetz 2050 study, in German (pdf, 22.79MB)

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