Borssele Beta platform topside ready for sail out

20.03.2020

In the Borssele offshore wind farm area in the south-western part of the Dutch North Sea, Borssele Alpha, the first and largest connection system for wind farms from the Dutch-German transmission system operator (TSO) TenneT in Dutch territorial waters, is already in operation. Now the TSCNET shareholder is in the process of installing Borssele Beta to connect further wind farms, in this case Borssele III and IV that are still under construction. The topside of the offshore transformer platform for Borssele Beta is now ready for shipping. It was built at the construction yard of the offshore platform specialist HSM Offshore in Schiedam in the Rotterdam-The Hague metropolitan area and will be put to sea on 22 March 2020.

When the pontoon carrying the 3,650-tonne superstructure arrives at its destination, a crane vessel will place the top side on the platform substructure (jacket). The top side comprises three interior levels and an outer deck. It is 25 metres high, 58 metres long and 32 metres wide. The Borssele Beta grid connection will have a capacity of 700MW and is scheduled to be commissioned on 1 September 2020. The Borssele III, IV, and V wind farms, which are located about 22km from the coast, will be connected to this transmission system. Borssele V by the Two Towers consortium has been designated as an innovation site within the wind farm zone and will be connected to Borssele Beta. The electricity generated by these offshore wind farms will then be transported ashore via two 67-kilometre-long cables to the high-voltage transformer station near the town of Borssele in the Dutch province of Zeeland.

Marco Kuijpers, Director Offshore Projects a TenneT, comments on the TSO’s progress in offshore expansion: “With this platform, the offshore grid that TenneT is building in the Dutch North Sea is definitively taking shape. Borssele Beta is the second offshore grid connection built by TenneT. Over the coming eight years we will build a new offshore connection every year. I am proud that we are able to make such a significant contribution to the energy transition in which offshore wind energy plays a crucial role.”

TenneT also assumes a marine ecological responsibility and makes its offshore platforms available for other uses. The TSO cooperates in this respect with the Dutch Directorate-General for Public Works and Water Management (Rijkswaterstaat). The Borssele Beta offshore platform therefore also features a Maritime Information Provision Service Point (MIVSP). This is a monitoring station with various monitoring systems, such as nautical radars, meteorological systems and ecological monitoring systems. Similar stations are being installed on every TenneT offshore transformer platform.

The topside of the offshore transformer platform Borssele Beta of TenneT is constructed and ready for shipping (picture: HSM Offshore)

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TenneT creates, invests and researches for the energy future

12.03.2020

Promoting the energy transition is a priority objective of TSCNET shareholder TenneT, the Dutch-German transmission system operator (TSO). This is clearly reflected in the TSO’s just-published Integrated Annual Report. As in recent years, the Annual Report is accompanied by the Green Finance Report 2019.

In line with the energy policy and climate goals of the Netherlands and Germany, TenneT increased its investments yet again in 2019 and spent €3.1bn on the energy transition and supply security (grid availability of 99.9998% in 2019). This financial commitment is even to be stepped up: TenneT is planning annual investments of €4bn to €5bn for the future. The financial performance of the company, with revenues of €4.1bn in 2019 and an EBIT (excluding special effects) of €753m, supports these ambitious plans. Manon van Beek, CEO of TenneT, has every reason to be content with the sound development of the TSO: “We have made great strides again in pursuing our ambition to achieve a sustainable energy future for everyone. Not only in realising and developing new onshore and offshore connections, but also by the required far-reaching international cooperation and working on innovations in close coordination with relevant stakeholders.”

As regards offshore connections, TenneT has already exceeded in 2019 the German government’s expansion target for offshore wind power capacity in the North and Baltic Sea, which is 6.5GW for 2020. With last year’s commissioning of BorWin 3, TenneT’s ninth offshore grid connection system in DC technology, the TSO now has a total of twelve offshore grid connections in operation (nine in DC and three in AC technology) with a total capacity of 7.1GW. But TenneT is not resting on its successes to date: The connection systems DolWin5, DolWin6, and BorWin5 are being developed and will increase the offshore transmission capacity provided by TenneT for wind farms in the German North Sea to almost 10GW by 2025. In addition, Borssele Alpha, TenneT’s first offshore connection system in AC technology in the Dutch North Sea, was installed on schedule and is now ready for operation. Borssele Beta will be completed in 2020.

Onshore, TenneT has eight transmission lines under construction in Germany, more than ever before. In the Netherlands, the 60km-long Randstad 380kV North Ring power line was put into operation, reliably supplying Europe’s most densely populated area with electricity and providing transmission capacity for green energy. At European level, the “green” COBRAcable deserves special mention, which since 2019 directly connects the Dutch and Danish markets for the first time. The German and Norwegian markets will also be directly connected by the NordLink cable, which is currently under construction. On top of this, a proof-of-concept for the North Sea Wind Power Hub has shown the technical feasibility of the concept of multiple wind power distribution hubs in the North Sea.

All these grid expansion projects are complemented by innovative solutions and intensive research to better utilise TenneT’s existing transmission system. These include vehicle-to-grid pilots, the deployment of home storage systems in grid stabilisation and digital solutions for higher grid utilisation. Another long-term innovation project is Element One, a 100MW electrolysis plant to be built in Germany to promote an integrated energy system.

TenneT presents Integrated Annual Report 2019 and Green Finance Report 2019 (picture: TenneT)

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Deep Dig-It trencher at work for TenneT

09.03.2020

The Hollandse Kust (South) offshore wind area in the Dutch North Sea is located 22 kilometres off the coast of the Dutch province of Zuid-Holland. TSCNET shareholder TenneT is responsible for connecting the wind farms under construction there via two corresponding offshore platforms to the onshore high-voltage substation in the industry and port area of Maasvlakte, from where the green electricity is transmitted further to the Randstad 380kV South Ring power line in the Dutch Randstad region, the most densely populated area in Europe, and further.

But there is a major challenge to be met by the Dutch-German transmission system operator (TSO): On the first ten kilometres of the offshore route, the four submarine cables to be laid are crossing the entrance to Europe’s busiest cargo port, the port of Rotterdam. To pass through the busy Rotterdam-Maasmond shipping lane, the cables here must be buried more than 5 metres deep into the seabed. For this specific job, the Dutch maritime contracting company Van Oord designed and built the Deep Dig-It trencher, a gigantic remote-controlled trencher.

Last Friday, final tests were carried out in the Aleksiahaven of Maasvlakte in preparation for the actual laying of the submarine cables in July. The innovative device is a so-called Tracked Remotely Operated Vehicle, which drives unmanned over the seabed, creates a deep trench for the cables, inserts the cables and closes the trench again. The Deep Dig-It is the largest and most powerful machine in its class. The trencher weighs 125 tonnes, is more than 17 metres long, well over 8 metres high and 11 metres wide. This makes it possible to bury cables in very hard ground, while the burial depth that can be achieved with the Deep Dig-It is well over 5 metres.

TenneT employs the powerful Deep Dig-It trencher to connect the Hollandse Kust (South) wind farms to the onshore grid (picture: Van Oord nv)

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COBRAcable proves to be a great success

06.03.2020

It is now half a year since TSCNET customer Energinet, the transmission system operator (TSO) from Denmark, and TSCNET shareholder TenneT, the Dutch-German TSO, made COBRAcable available to the market. The high-voltage DC cable with a length of about 325km and a capacity of 700MW is the first direct connection between the electricity markets of Denmark and the Netherlands. The basic idea behind COBRAcable is to compensate for the volatility of wind power. Consequently, the Netherlands imports electricity via the cable on days with large Danish wind power generation, while on days with little wind in Denmark the electricity is transported in the opposite direction.

This works perfectly, as the interconnector’s transmission data from the first six-month period prove: In total, Denmark has imported almost 700GWh via the COBRAcable and the Netherlands almost 1,400GWh. On average, COBRAcable was operated at full capacity 79% of the time during the last half year. The impressive traffic on this binational connection proves its adequacy through its operation. The new interconnector therefore substantially contributes to the energy transition by exchanging volatile renewable energy across borders and additionally creates a trading profit on the spot market for electricity – a multiple benefit for nature, society and the companies involved.

The transmission data from the COBRAcable of Energinet and TenneT confirm a high level of traffic on the line (picture: screenshot taken from Energinet-video “Constructing the green COBRAcable”, Vimeo)

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Dutch communication pilot project for aFRR provision

25.02.2020

The significant growth in decentralised energy generation is noticeably changing the European energy landscape. Consumers are also playing an increasingly active role by generating their own electricity as prosumers. The electricity system is thus changing from a demand-oriented system with centralised generation to a more supply-oriented system with decentralised generation. Maintaining the balance of the future transmission system is thus a major concern of European transmission system operators (TSOs), which could be supported by new players serving the ancillary services market as balancing services providers (BSPs). However, product specifications stand for a barrier to new entrants, for example in the field of data communications.

TSCNET shareholder TenneT, the Dutch-German TSO, is already researching suitable balancing solutions in several projects. TenneT is now also investigating the possibility of allowing decentralised, sustainable electrical energy to participate in the Dutch market for automatic Frequency Restoration Reserve (aFRR). The aFRR delivery requires a real-time data connection. Until now, the only secure and reliable option has been the leased line. This is not a problem for large production units, while for new BSPs the purchase of a leased line is a major barrier to entering the aFRR market.

This is where the aFRR pilot project comes in: For the first time, a new type of data connection was successfully used, whereby the data communication between the market participants and TenneT (for activation and measurements) was realised via TenneT’s mobile network. This removed a major obstacle to the provision of aFRR by (new) BSPs and enabled grid balancing by means of horticulturists, electric boilers and car batteries. TenneT will monitor and evaluate the performance of its mobile network in the coming months. If this is successful, the TSO will make the data connection available as soon as possible to all BSPs interested in using it to supply aFRR.

Tomatoes from Dutch greenhouses keeping the grid in balance – TenneT carries out a pilot project to improve data communication for aFRR supply

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€215m for green connection capacity

11.10.2019

The Dutch-German transmission system operator (TSO) TenneT plans to invest a further €215m to connect two GW of green electricity from solar and wind farms in the north of the Netherlands to the grid. The infrastructural measures include the construction of two new 380/110kV high-voltage substations in the provinces of Groningen and Drenthe. In addition, the TSCNET shareholder intends to provide extra capacity at nine existing 110kV substations in the northern Netherlands.

One GW corresponds roughly to the output of 3.5 million solar modules or 200 wind turbines. The additional capacity planned by the TSO is therefore considerable, but according to Ben Voorhorst, COO of the TSO, as many solar and wind farm transmission requests as possible should be complied with. Already now TenneT operates projects in the northern Netherlands with a volume of more than €1bn. This level of investment is now being further increased, with the TSO focusing strongly on the sustainability and efficiency of the investments. “The better the capacity expansions of electricity grids are actually utilised, the better the consumer’s money is spent,” explains Voorhorst.

TenneT invests €215m in the connection of renewable energies in the northern Netherlands (picture: TenneT)

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Borssele Alpha ready to operate

05.09.2019

Just one month ago, TSCNET shareholder TenneT fully implemented BorWin3 in the German Bight, the twelfth offshore grid connection project of the Dutch-German transmission system operator (TSO). Now there is once again good news for the energy transition, this time from the Dutch North Sea: Borssele Alpha, TenneT’s first and largest connection system for wind farms in Dutch territorial waters, is ready for operation – right on schedule and within budget. From 2020 on, Borssele Alpha will supply the green electricity from the offshore wind farms Borssele I and II ashore.

The two Borssele wind farms will have a capacity of around 700MW. The Borssele Alpha grid connection will transmit the electricity to the substation near the town of Borssele in the Dutch province of Zeeland, where TenneT has built a new transformer station next to the existing station. The Borssele grid connection is TenneT’s first Dutch major project under the National Energy Agreement for offshore wind farms and fully complies with the conditions set out in the Dutch government’s Offshore Wind Energy Development Framework.

According to the Energy Agreement, TenneT will have installed 3,500MW of grid connections for offshore wind farms by the end of 2023. The next project is Borssele Beta, followed by Hollandse Kust (zuid) Alpha and Beta and Hollandse Kust (noord). TenneT’s standardised procedure for offshore connections will make it possible to complete these projects more efficiently, quickly and economically. In line with the Dutch Follow-up Roadmap for Offshore Wind Energy, a further 6,100MW of offshore wind energy will be realised between 2024 and 2030.

The Borssele Alpha offshore grid connection of TenneT is operational (picture: Screenshot taken from the Borssele video)

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COBRAcable market launch on 7 September

02.09.2019

After three years of construction, including the laying of the submarine cables as well as the construction of two onshore converter stations, and a successful test phase earlier this year, COBRAcable will be available for the electricity market as of the delivery day of 7 September, which is exactly on schedule. The first direct connection between the electricity markets of Denmark and the Netherlands was jointly realised and is operated by the two TSCNET shareholders Energinet, the Danish transmission system operator (TSO), and TenneT, the Dutch-German TSO.

The high-voltage DC cable with a length of about 325km has a capacity of 700MW. The Netherlands can import more sustainable electricity from Denmark through COBRAcable, mainly wind energy. In addition, the cable provides Dutch capacity on a structural basis for the Danish electricity grid, thus ensuring security of supply in Denmark, which of course also works the other way round. Moreover, the cable connection is designed in such a way that an offshore wind farm can be connected at a later date, so that COBRAcable contributes to a sustainable European energy landscape.

The COBRAcable interconnector of Energinet and Tennet is available to the market from 7 September (picture: screenshot taken from TenneT-video “First pile COBRAcable”, YouTube)

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TenneT on track for the energy transition

31.07.2019

Highly satisfactory business results and maintenance of the high level of 99.99% security of supply, are hallmarks of the half year report of the Dutch-German TSCNET shareholder Tennet. The latter is a growing challenge for the transmission system operator (TSO) because of the increased feed-in of volatile renewable energy. But above all, the report illustrates the commitment of the TSO to the European energy transition.

To take further steps in shaping the energy system of the future, TenneT has launched a series of strategic initiatives and partnerships to join forces across sectors. TenneT is participating in a German power-to-gas pilot project and is working together with regional grid operators and market partners on smart solutions to optimise the use of existing electricity infrastructure. The TSO is also involved in blockchain pilots to create flexibility for balancing the power system from decentralised sources.

TenneT has further strengthened its position as a leading offshore TSO. In Germany, TenneT has awarded DolWin 5, the 14th offshore grid connection. TenneT will increase its current offshore transmission capacity from 6,232MW in the German North Sea to almost 9GW by 2024. In the Netherlands, too, the development of the offshore grid with the Borssele Alpha and Beta projects is on schedule. TenneT intends to provide a total of 10.6GW of connection capacity for Dutch offshore wind farms by 2030. The TSO is also carrying out several onshore projects to ensure the transport of the growing amount of green electricity and thus security of supply in its control areas. Important interconnecting projects are the NordLink cable connection, which is currently being built to directly link the German and Norwegian markets for the first time. The COBRAcable between the Netherlands and Denmark has “landed” at the Dutch shore and will go into operation this year.

These developments are complemented by solid and impressive figures: Underlying operating result (EBIT) rose from €362m (first half of 2018) to €407m in the first half of 2019. €1,094m (first half of 2018: €904m) were invested in the Dutch and German high-voltage grids (of which €612m in Germany) and a total of €1.75bn green bonds were successfully issued. Manon van Beek, CEO of TenneT, comments on the report: “We have embarked on an irreversible transition to a sustainable society and a new energy system. This requires investments, not only in new electricity connections, but also in innovations and digitalisation. We have to move to holistic energy system thinking and also work on solutions to make better use of the existing high-voltage grids. We are convinced that this is the way forward to limit social costs and at the same time maintain a very high security of supply.”

TenneT presents its half year report 2019 (picture: TenneT)

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TenneT’s “sea harvest” increases

15.07.2019

9.51TWh – this is the considerable total amount of offshore wind power that TSCNET shareholder TenneT, the Dutch-German transmission system operator (TSO), transmitted from sea to land in the first half of 2019. This means that the first half of 2018 (8.17TWh) will be exceeded by a whopping 16%, while on the German market offshore wind energy accounts for a strong 15% of total wind energy generation. At the same time, the cost efficiency of new offshore grid connection systems has further improved in recent months through the standardisation of TenneT’s offshore grid connection systems and the combined expertise of TenneT as a leading TSO at sea.

With the connections currently planned and under construction, TenneT will increase offshore transmission capacity in the German North Sea to almost 9GW by 2024. However, current efforts in Europe will not be sufficient to achieve the climate targets of the Paris Agreement. TenneT therefore calls for a stronger expansion of offshore wind energy in Europe to create a low carbon energy future. TenneT COO Tim Meyerjürgens refers to international studies and scenarios that indicate that “an accelerated and large-scale roll-out is necessary”.

In this context, Meyerjürgens also points to the North Sea Wind Power Hub (NSWPH) concept, for which a positive feasibility study has just been carried out. The North Sea has great potential for offshore wind power, and the NSWPH consortium’s approach could result in 180GW of offshore wind power by 2045. Meyerjürgens explains: “A future internationally coordinated approach could implement the connection and integration of a roll-out of large-scale offshore wind energy more effectively and at considerably lower costs of up to 30% than with continued individual national planning.”

Offshore wind energy transmission by TenneT rose to 9.51TWh in the first half of 2019 (picture of SylWin Alpha converter platform: Tennet)

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