€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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Danish wind power generation exceeds demand

23.09.2019

Sunday, 15 September 2019, now is a historical date for the Danish electricity market. Within the 24 hours of that day and during the first strong autumn winds of the year, wind power generation covered 130 percent of national demand, thus exceeding it for the first time for an entire day. According to preliminary figures from TSCNET shareholder Energinet, the Danish power transmission system operator (TSO), Danish wind turbines generated between 2 a.m. and 3 a.m. early Sunday morning an impressive 60 percent more electricity than the Danish market actually consumed.

For one thing, this beats the previous record of 9 June 2019 (52 percent above demand), but what is even more significant for the Danish energy transition is this being the first 24-hour period ever in which surplus wind energy has been generated during all day and night hours. This surplus wind energy was further transmitted by Energinet and sold to other countries.

Carsten Vittrup, Energy Strategy Adviser at Energinet, comments on these groundbreaking figures: “A mere ten years ago, wind accounted for only about one fifth of our supply. But things have developed extremely fast, meaning that we now see not just hours, but entire days of wind turbines generating more electricity than we need.”

Energinet reports record in national wind power generation (picture: Energinet)

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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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BorWin3 in operation

12.08.2019

The offshore grid connection BorWin3 operated by TSCNET shareholder TenneT in the German Bight is ready for feed-in since early August. This means that the total transmission capacity for offshore wind farms in the German North Sea is already 7.132GW. The Dutch-German transmission system operator (TSO) has thus not only met the German government’s expansion targets for sustainable North Sea wind power – 6.5GW by 2020 – but has significantly exceeded them.

BorWin3, TenneT’s twelfth offshore grid connection project, brings a further 900MW capacity. After BorWin1 and BorWin2, it is the third connection that the TSO has implemented near the East Frisian island of Borkum using DC technology. The corresponding converter and transformer station were built at TenneT’s Emden/Ost site to feed the green energy into the onshore extra-high voltage grid. BorWin3 bridges a total distance of 160km. The submarine cable is 130km long and the last section ashore to Emden/Ost is completed by underground cabling.

The TSO can be satisfied with its own offshore progress, but TenneT Managing Director Tim Meyerjürgens calls for further efforts, as the current rate of offshore wind expansion in Europe is not sufficient to achieve the goals of the Paris Climate Agreement. “An accelerated, large-scale and internationally coordinated expansion is necessary,” explains Meyerjürgens. In this context, TenneT has just presented a feasibility study of the North Sea Wind Power Hub concept for the implementation of wind power distribution hubs in the North Sea. Meyerjürgens points out that with an internationally coordinated approach the connection and integration of large offshore wind energy capacities could be much more effective and cost-efficient than with continued individual national planning.

In early August, the offshore grid connection BorWin3 of TenneT was put into operation (picture of the offshore converter platform BorWin gamma: TenneT)

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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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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)

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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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TSO offshore connections are most cost-effective

26.06.2019

In most European countries with offshore wind farms, the respective transmission system operators (TSOs) are responsible for connecting these offshore facilities to the onshore grid, which they also operate. The TSCNET shareholders affected by this arrangement include the north-eastern German TSO 50Hertz, the Danish TSO Energinet and the Dutch-German TSO TenneT. But obviously this handling is not the only one possible. In the UK, for instance, the developer of the particular offshore wind farm is also responsible for its grid connection.

In concrete terms, this means that in the UK the offshore grid connection after its completion is sold to commercial investors and a so-called OFTO (Offshore Transport Owner) is established. But which model, the TSO model or the OFTO model, causes the lowest costs for consumers and thus for society?

The internationally accredited registrar and the world’s largest classification society, DNV GL, has investigated this question in more detail. The main outcomes of this study are that in the OFTO system the costs for the development of offshore connections are significantly higher than in Denmark and the Netherlands. In contrast, the Levelised Cost of Energy (LCOE) of the Dutch and Danish offshore connections is significantly lower. The LCOE assesses the average total cost of constructing and operating an energy generating asset over its lifetime divided by its total energy output over that lifetime.

DNV GL has documented lower costs for the TSO connection of offshore wind farms than for the OFTO solution (illustration of Borssele Alpha: TenneT)

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Imminent test operation for COBRAcable

24.06.2019

COBRAcable, the first direct interconnection between the electricity markets of Denmark and the Netherlands, is a joint project of the two TSCNET shareholders Energinet, the Danish transmission system operator (TSO), and TenneT, the Dutch-German TSO. Since spring, the partner TSOs have been preparing the commercial operation of COBRAcable. TenneT and Energinet have now launched an Urgent Market Messages (UMM) site for the commissioning of COBRAcable, which is scheduled to take place between 3 July 2019 and 6 September 2019.

A total of around 30 individual tests with different energy charges in the respective transport directions are planned. It is expected that the full capacity of COBRAcable will be available for the day ahead and intraday markets from 7 September. TenneT and Energinet then will offer financial transmission rights on COBRAcable at monthly and annual auctions. The first auction is expected to take place after a full month of stable operation, so probably the auction for November 2019, which will be held in October.

By promoting the exchange of surplus wind energy, COBRAcable will improve the cohesion of the European transmission system and the integration of the electricity market. It will also make a sustainable contribution to the low carbon energy future by allowing future offshore wind farms in the North Sea to be hooked up to the DC interconnector.

Energinet and Tennet will carry out individual tests of COBRAcable as of 3 July (picture: screenshot taken from TenneT video “COBRAcable Cable Pull Fano Denmark Film”, YouTube)

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