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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DA/RE project: Redispatch 2.0

09.04.2020

The grid security initiative DA/RE (“DAta exchange/Redispatch”) was launched in summer 2018 by TransnetBW, the transmission system operator (TSO) from the south-western German state of Baden-Württemberg, and entered the pilot phase on 1 April 2019. The first retrievals of redispatch capacities were carried out in summer 2019 and now the pilot phase of the Baden-Württemberg grid project has been successfully concluded. Apart from TSCNET shareholder TransnetBW, three distribution system operators (DSOs) and four other partners from the fields of virtual power plants, home storage, and energy trading were involved in the DA/RE pilot phase.

Like comparable projects, DA/RE responds to the increasing volatility and decentralisation of electricity generation. In order to stabilise the entire electricity system in the future, DA/RE intends to facilitate the transition from the current redispatch with centralised large-scale power plants to new processes involving the flexibility potential of smaller decentralised generation plants and storage facilities. In the pilot phase, the DA/RE partners have achieved their first project goal: Processes for the coordinated retrieval of redispatch power from the distribution grid over several voltage levels have been developed and successfully tested in practice. The entire process chain from the exchange of planning data via DA/RE internal processes with merit-order based plant selection up to the activation of the physical plant retrieval was tested in three steps. A total of 40 plants of different technologies with rated outputs between 3kW and 30MW were involved.

Key assumptions corroborated
In the pilot phase, the coordinated redispatch retrieval was verified across all voltage levels and the basic functionality of the DA/RE concept was confirmed. With the experience and findings gained from this, the final DA/RE platform is now being developed, for which uniform processes and interfaces to automate the process steps will be defined. This will ensure the scalability and mass suitability of the system and simplify the integration of smaller grid and plant operators.

The two DA/RE project managers, Florian Gutekunst from TransnetBW and Kilian Geschermann from the DSO Netze BW, describe DA/RE as an open project: “We are looking forward to involving further interested parties from the ranks of grid and plant operators as fellow campaigners. We are all facing growing challenges due to the transformation of the generation landscape; together we can find smart solutions and better meet the challenges.”

The pilot phase of the DA/RE project for smart decentralised redispatch solutions has successfully been concluded

Linkup
> See TransnetBW press release, in German (html)
> Visit DA/RE website, in German (html)

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Integrated market in Switzerland

13.02.2020

In Continental Europe, the synchronised frequency is of 50 Hz. It is a core task of every transmission system operator (TSO) to keep the balance between power production and consumption and the grid frequency stable. The Swiss TSCNET shareholder Swissgrid, the national TSO, operates a market for ancillary services for this purpose. Power plants and other auxiliary service providers (ASPs) in Switzerland hold primary, secondary and tertiary control reserve capacities on behalf of Swissgrid and, in case of frequency deviations, allocate them against compensation. Primary and secondary control energy is retrieved automatically and tertiary control energy manually.

Swissgrid is constantly striving to further develop the ancillary services market with innovative solutions. These include the bundling of manually retrieved products for frequency control and for international redispatch into a single integrated market. A market platform suitable for this purpose, which enables the retrieval of both, tertiary control energy and energy for international redispatches, was successfully launched by Swissgrid last week. This is possible because the two products have the same characteristics and can be called up with the same lead time of 15 minutes.

The specifications of the platform design allow the market offers to be freely changeable. This means, above all, that there is no longer any competition between the tertiary control energy market and the intraday market. ASPs can now offer the energy not sold in the intraday market on the integrated market. Another new feature is that tenders can be processed using the communication protocol of the Energy Communication Platform (ECP) of the European Network of Transmission System Operators for Electricity (ENTSO-E), which enables direct communication between the IT systems of the ASPs and the Swissgrid bidding platform. This process automation leads to greater transparency.

Swissgrid has launched a platform for the integration of the tertiary control energy market and the international intraday market (picture of the Mettlen-Lavorgo powerline: Albinfo / CC BY 3.0)

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> See Swissgrid news release (html)

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Redispatch with renewable energy systems in practical test

12.02.2020

In Germany, redispatch measures for the eliminations of bottlenecks within the transmission grid are currently limited to conventional power generation plants. An amendment to the German Energy Industry Act with effect from 1 October 2021 allows renewable-energy facilities to be deployed for redispatch measures. These new regulations will strengthen the role of renewables in the maintenance of electricity system security. The task now is to ensure balance sheet handling for such redispatch measures and to develop a mode for the financial settlement of the interventions.

For this reason, TSCNET shareholder 50Hertz, the transmission system operator (TSO) from north-east Germany, has entered into an agreement with the Norwegian energy company Statkraft, Europe’s largest producer of renewable energy, to jointly test redispatch with renewable energy systems in practice. The key objective of these practical tests is being able to calculate the necessary effort for redispatch measures with renewable energy systems. 50Hertz accesses wind farms marketed by Statkraft in Brandenburg and Mecklenburg-Western Pomerania that are directly connected to the TSO’s transmission grid or to a regional distribution grid. 50Hertz and Statkraft want to test demand variants for the wind farms to allow the legal requirements to be implemented efficiently and safely with this new form of redispatch.

Dr Dirk Biermann, Managing Director Markets and Systems Operation at 50Hertz, explains that due to the new legal regulations, TSOs will in future have various options for the demand of redispatch for plants in the distribution grid. Dr Biermann comments on the forthcoming practice tests: “Demand via the distribution system operator is just as possible as direct demand by 50Hertz. Our aim is to identify the most efficient way. We hope that the field test will provide us with important insights in this regard.”

50Hertz and Statkraft have agreed to jointly test redispatch with renewable energy systems in practice

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> See 50Hertz press release (html)

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Study on German-Polish TSO cooperation

16.01.2020

The two transmission system operators (TSOs) and TSCNET shareholders 50Hertz from Germany and PSE from Poland jointly conducted the “German-Polish Study on cooperation between TSOs PSE and 50Hertz in long-term and mid-term perspectives”, which now has been finalised. The study was supported by the respective national Ministries responsible for energy.

As its title suggests, the study is divided into an investigation of medium-term and long-term cooperation objectives. The mid-term part aims at improving the coordination of the operational planning processes. The following issues, among others, have been identified as important: improving the quality of forecasting of power flows at the German-Polish border and the coordinated use of cross-border remedial measures such as phase-shifting transformers as well as bilateral and multilateral redispatch. To better predict cross-border flows, PSE and 50 Hertz agreed to support the development of a flow-based methodology, and as far as the remedial measures are concerned, advanced software solutions are required. However, not only the development of an IT tool is needed here, but also advanced coordination and cost sharing in a region-wide mechanism.

For the long-term study, a modelling process carried out by the National Centre for Nuclear Research in Warsaw was used, which was consulted and monitored by experts from both TSOs. Using alternative scenarios, different time frames and market simulations, the main trends in German-Polish electricity exchange as well as future challenges for regional markets and networks were identified, such as interconnector capacities, growth of energy demands or deviating energy prices.

50Hertz and PSE have conducted a joint study on German-Polish TSO cooperation (picture: Andreas Vogel / CC BY-SA 4.0)

Linkup
> See PSE press release (html)
> See 50Hertz webpage on the study, in German (html)
> Open Executive summary (pdf, 538.47kB)

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Swissgrid and hydropower storage plants agree on minimum production

20.12.2019

To avoid an overload of grid elements in western Switzerland during the winter holidays, TSCNET shareholder Swissgrid, the Swiss transmission system operator (TSO), has agreed upon a minimum production with selected regional hydropower storage plants. This is intended to reduce the potential increased and costly need for redispatch during these low-consumption days.

The measure is also necessary because the availability of the transformer at the Bassecourt substation in the canton of Jura is currently limited and the new transformer at Mühleberg in the canton of Berne has not yet been fully installed. Both projects will be implemented in spring 2020. The agreed minimum production in the period from 20 December 2019 to 6 January 2020 is 200MW (off-peak) and 400MW (peak).

Swissgrid has negotiated minimum production from hydropower storage plants

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> See Swissgrid news release (html)

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Final Conference of FutureFlow

10.09.2019

The FutureFlow project reaches the final straight: On 15 October, the Slovenian transmission system operator (TSO) ELES will host the final conference of the successful project in the Austrian capital of Vienna. FutureFlow was launched in 2016 and funded by the EU under the Horizon 2020 programme. The twelve project partners from eight European countries will officially conclude the project in December 2019.

The increasing regenerative energy generation and decreasing flexibility from conventional power plants require innovative approaches by the players in the electricity market. This is where the FutureFlow project comes in by exploring innovative e-trading solutions for smart cross-border balancing and redispatching in the control areas of four central-south European TSOs, all shareholders of TSCNET. In addition to the project coordinator ELES, the other TSO participants are APG from Austria, MAVIR from Hungary and Transelectrica from Romania.

At the final conference the FutureFlow partners will present the most important project results and options for their implementation. These include, for example, the real-time results of the cross-border pilot tests and the operation of the IT platforms developed as part of FutureFlow.

The final conference of the FutureFlow project is hosted by Eles in Vienna on 15 October (picture: Stefan Steinbauer, Pixabay)

Linkup
> See ELES press release (html)
> Visit FutureFlow website (html)
> Visit FutureFlow conference website (html)

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High growth in renewables in the 50Hertz area

17.07.2019

The generation of power from wind and sun is increasing steadily and strongly in the control area of TSCNET shareholder 50Hertz, the north-eastern German transmission system operator (TSO). 21.6TWh of wind power were generated in the first half of 2019, compared with only 16.6TWh in the corresponding period of the previous year. In the same time, photovoltaic generation amounted to 6TWh, which is an increase of almost 170GWh. This corresponds with the rise in the installed capacity of onshore and offshore wind turbines, which totalled 19.6GW in mid-2019 (mid-2018: 18.9GW) and the installed capacity of photovoltaic systems, which reached 11.1GW (mid-2018: 10.6GW).

Despite this capacity increase and the incrementing feed-in of electricity into the grid, 50Hertz was able to maintain stable costs for congestion management, such as interventions in the operation of conventional power plants and the temporary shutdown of renewable energy facilities. In the first half of 2019, redispatch costs amounted to around €13m and the costs for feed-in management to around €48m.

This increase in renewable generation and installed capacity from renewable facilities shows that northern and eastern Germany make an indispensable contribution to achieving the German government’s target of a 65% share of renewable energies in nationwide electricity consumption by 2030. However, from the TSO perspective of 50Hertz, the necessary grid extension must be pushed ahead in parallel to be able to transmit the green electricity to the consumption centres in the south and to keep congestion management costs under control.

The generation of electricity from renewable sources is increasing in the control area of 50Hertz (picture showing the transformer platform of the Baltic Sea wind farm Arkona: 50Hertz)

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

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DA/RE project: first retrievals of redispatch capacities

11.07.2019

The Baden-Württemberg grid security initiative “DA/RE” (“DAta exchange/REdispatch”) addresses the increasing volatility and decentralisation of power generation. The aim is to stabilise the entire electricity system by utilising the flexibility potential of decentralised generation units from lower grid levels. Originally launched in the summer of 2018 by TSCNET shareholder TransnetBW, the German transmission system operator (TSO) from the state of Baden-Württemberg, and the southwest German distribution system operator (DSO) Netze BW, the project consortium was later expanded so that a total of three DSOs and four other partners from the areas of virtual power plants, home storage and energy trading were involved in the first DA/RE pilot phase from April to June 2019.

During this phase, the participants have defined and developed the method of data exchange and coordination. Following this successful implementation process, the first retrievals from pilot plants in the distribution network for redispatch purposes have now been initiated. Capacities were retrieved from battery home storage facilities, several biogas plants, a waste incineration plant and a cogeneration plant. The tests therefore involved both medium-voltage and low-voltage systems and the project partners have demonstrated that it is possible and important to make use of all flexibilities at all voltage levels for grid stabilisation.

“The retrievals from systems in the distribution network constitute a significant milestone for us, as they show that the concept is feasible and we are now able to gain initial experience in terms of practical suitability,” explains DA/RE project manager Florian Gutekunst from TransnetBW. The second stage of the pilot phase has thus begun. Further retrievals are now being carried out and various application cases are being tested. In concrete terms, the issue is how grid operators can trigger the retrieval of redispatch measures in a coordinated manner and how the information chain should be designed in order to guarantee all parties involved at all voltage levels complete transparency about the retrieval and the capacity provided. In the following third step, the retrievals are to be automated and the corresponding data paths implemented.

First retrievals of redispatch capacities have been carried out in the pilot phase of the DA/RE project (picture showing a scene from electricity trading: Next Kraftwerke)

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

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Connect+ for data exchange

14.06.2019

The four German transmission system operators (TSOs), the TSCNET shareholders 50Hertz, Amprion, TenneT, and TransnetBW, together with 16 distribution system operators (DSOs) have launched the “Connect+” project to jointly implement the legal requirements of the German Grid Expansion Acceleration Act (Netzausbaubeschleunigungsgesetz – NABEG). The project is a reaction to the increased need for coordination due to the current legislative amendments and intended to facilitate a more transparent exchange of data between grid operators and market participants.

German legislation has specified that, in future, all facilities for the generation or storage of electrical energy with a nominal capacity of 100kW or more must be utilised to prevent foreseeable bottlenecks in the grid. The modified conditions for redispatch apply from 1 October 2021. As the present feed-in management of the grid operators only reacts to acute congestions, an even more intensive cooperation between TSOs and DSOs is required in the future.

The new processes to be developed and introduced within the time frame pose a challenge for all grid operators. In the “Connect+” project, TSOs and DSOs want to develop uniform solutions for data distribution to harmonise data exchange between market participants and operators for congestion management. In a first step, essential specifications such as interfaces and formats are developed and defined.

The four German TSOs and 16 DSOs launch the data exchange project “Connect+” for congestion management

Linkup
> 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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