Our key tasks

We are primarily tasked with providing power transmission services, system services and facilitating the energy market. Our core tasks follow from our appointment as grid operator under the Dutch 'Elektriciteitswet' (E-wet) and the German 'Energiewirtschaftsgesetz' (EnWG).

 

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Innovation

TenneT presents Hub and Spoke concept for large scale wind energy on the North Sea.

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Our grid

TenneT manages the high-voltage grid in the Netherlands and large parts of Germany. TenneT transmits electricity at 110,000 volts (110 kV) and higher. With over 22,500 kilometres of high-voltage lines, we cross borders and connect countries.

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Grid maps

Maps of our onshore and offshore high-voltage grid.

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Electricity market

The energy sector is developing rapidly. The process of European market integration began some years ago. Its purpose is to create a single European market that enables market parties to trade gas and electricity across national borders easily and efficiently.

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Transparency data

We provide transparency data on our operations on our Dutch and German transparency page and on ENTSO-E. 

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E-Insights

Our vision is to be one of the most transparent Transmission System Operators (TSO) in Europe and thereby creating value for society. In this Energy Insights section we present selected energy related topics and show data, information and valuable insights. 

E-Insights

Energy transition

Wind turbines and solar panels are the physical signs of consumers’ growing desire for clean, renewable energy.

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Company

TenneT is a leading European electricity transmission system operator (TSO), with activities in the Netherlands and in Germany. We strive to ensure a reliable and uninterrupted supply of electricity in our high-voltage grid for some 41 million people.

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We are TenneT

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Technical topics

All consulted technical topics and documents.

Technical topics

T.1 Voltage level

TenneT intends to standardise the offshore substations. Standardisation includes a standardised voltage level of the infield cables for all five wind areas to be realised in the coming years in line with the national Energy Agreement ("Energieakkoord"). TenneT intends to use 66 kV for the inter-array cable voltage level, assessing the impact of this decision versus the 33 kV alternative.

Documentation
- 1a Voltage level
- 1b 66 kV systems for Offshore Wind Farms by DNV GL

Feedback follow-up and report
- Voltage level feedback follow-up V2
- Voltage level feedback report
- Voltage level feedback report V3
- Voltage level feedback report V4

- Voltage level position paper V2.1 (2015 04 17: NEW version)
- Additional question on 33/66 kV inner array voltage (2015 05 27: NEW version)

T.2 # of J tubes / bays

Depending on the design of the infield grid, the total costs of the grid connection may be reduced if one or two additional J-tubes are installed. This topic reflects on the amount of J-tubes on the offshore substation to be taken into account for connecting the Power Park Module (PPM). Regarding this subject, the assumption is made that the voltage level of the PPM system is 33 kV or 66 kV.

Documentation
- Number of J tubes

Feedback follow-up
- Number of J tubes feedback follow-up
- Number of J tubes feedback follow-up V2
- Number of J tubes feedback report V3
- Number of J tubes feedback report V4

- Number of J tubes position paper V2
- Number of J tubes position paper V3
- Number of J tubes position paper V4

T.3 Point of Common Coupling

The point of common coupling defines the legal interface point between the generator and the grid operator.

Documentation

- Point of common coupling

Feedback follow-up and report

- Point of common coupling feedback follow-up
- Point of Common Coupling feedback report V2
- Point of Common Coupling feedback report V3

T.4 Access to platform

This topic focusses on conditions and requirement for third party access to the offshore platform.

Feedback follow-up and report
- Acces to platform feedback report V2
- Acces to platform feedback report V3

- Acces to platform position paper V1
- Acces to platform position paper V2
- Helideck and accommodation facilities on offshore platforms for wind farms

T.5 Operation of Bays

This topic discusses the operation of bays/switch gear during commissioning, normal operation and maintenance.

Documentation
- Operation of Bays

Feedback follow-up and report
- Operations of Bays feedback follow-up
- Operations of Bays feedback report V1
- Operations of Bays feedback report V2
- Operations of Bays feedback report V3

T.6 Protection

This topic discusses the protection requirements for PPM strings in relation to a common protection scheme of a 350 MW offshore wind farm.

Documentation
- Protection

Feedback follow-up and report

- Protection feedback follow-up
- Protection feedback report V2
- Protection feedback report V3

- Protection position paper V2

T.7 Reactive power compensation / Implementation of RfG code

This topic discusses the impacts and practical implementation of changes in the grid code resulting from the RfG code with a focus on the offshore PPM related elements.

Documentation
- Implementation of RfG codes

Feedback follow-up en report
- Reactive power Strategy
- Reactive power compensation Position Paper V1
- Reactive power compensation  feedback report V2
- Reactive power compensation  feedback report V3

T.8 SCADA

This topics concentrates on the location of, and access to, the wind farm SCADA system.

Feedback follow-up en report
- SCADA Feedback report V3
- SCADA Feedback report V4

- SCADA position paper V1
- SCADA position paper V2

T.9 Metering

This topics concentrates on the location and supply of electricity metering system.

Feedback follow-up en report
- Metering feedback report V2
- Metering feedback report V3

- Metering position paper V1

T.11 Overplanting

This topic discusses the possibilities and restrictions with respect to overplanting.

Documentation
- Overplanting
- Overplanting position paper V2

Feedback follow-up and report
- Overplanting feedback follow-up
- Overplanting feedback report V2
- Overplanting feedback report V3

T. 12 Redundancy / availability

Documentation

- Redundancy Position paper V1
- Redundancy position paper V2

Feedback follow-up and report
- Redundancy feedback report
- Redundancy feedback report V2

- Single line diagram - General. Borssele Alpha - designations

T.13 Installation interface management

Documentation
- Installation interface management position paper V1
- Installation interface management position paper V2
- Installation interface management position paper V3
- Installation interface management feedback report V1

T. 14 O&M interface management

Documentation
- O&M interface management position paper V1
- O&M Interface management position paper V2
- O&M Interface management position paper V3

- O&M interface management feedback report V1

T. 15 Harmonic emission limits

- Harmonic emission limits position paper
- Harmonic emission limits position paper V2

- Harmonics and transient study feedback report V1

T. 16 Physical coordinates

This topic explains the rationale behind the locations of the platforms, as well as the exact coordinates for platform Alpha in Borssele.

- Physical coordinates position paper

T. 17 Compliance testing

- Compliance testing position paper V1
- Compliance wind farms

T.18 Data acquisition systems on offshore platform

- Data acquisition systems on offshore platform position paper V1
- Data acquisition systems on offshore platform position paper V2

- Data acquisition systems on offshore platform feedback report V1