Tennet TSO

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Tennet TSO GmbH

legal form GmbH
founding 2009
Seat Bayreuth , GermanyGermanyGermany 
  • Otto Jager
  • Ben Voorhorst
  • Tim Meyerjürgens
Number of employees 2,524 (all subsidiaries of TenneT GmbH & Co. KG in Germany)
sales 3.6 billion (all Tochterges. TenneT GmbH & Co. KG in Germany)
Branch Transmission system operator
Website www.tennet.eu/de/
Status: 2019

The TenneT TSO GmbH , based in Bayreuth is a German transmission system operator and a subsidiary of the Dutch electricity network operator TenneT . TenneT TSO operates a Germany in extra high voltage - power grid (220 kV and 380 kV) between Schleswig-Holstein and Bavaria with a total length of around 12,980 kilometers.


TenneT campus in Bayreuth


The company goes back to the 2009 spin-off of the transmission network division from E.ON Netz GmbH within the vertically integrated energy group E.ON and the subsequent disinvestment by E.ON. E.ON Netz, based in Bayreuth, was created in 2000 when Bayernwerk AG and PreussenElektra AG merged to form E.ON Energie AG . The distribution range remained after the split in the E.ON network.

In May 2008, the E.ON Group undertook as part of a since 2007 ongoing antitrust case its due to alleged abuse of - dominant position as a transmission system operator on the secondary balancing energy market and also because of legal requirements for unbundling (→ EnWG -Novelle 2005) - towards the European Commission to sell its German extra high voltage network division to a competitor. With the commitment in November 2008, E.ON had the antitrust proceedings stopped by the EU Competition Commissioner Neelie Kroes in the run-up to the EU's third energy package . According to the commitment, the part of the company should be sold by December 1, 2010 at the latest.

As a result, on May 4, 2009, transpower stromtransmission gmbh (TPS), based in Bayreuth, was entered in the commercial register, which had been spun off from E.ON Netz but still owned by E.ON. At that time, Transpower had around 650 employees.

Ownership unbundling and renaming

In November 2009 E.ON announced that it had agreed on a sale with the Dutch electricity network operator Tennet . The takeover of Transpower Stromtransfers GmbH by Tennet (specifically by TenneT GmbH & Co. KG , then still Transpower GmbH & Co. KG ) for around 1.1 billion euros was completed on February 25, 2010 with retroactive effect to December 31, 2009. At the beginning of 2010, Transpower employed around 725 people.

A few months later, with effect from October 5, 2010, Transpower was brought into line with the name of the parent company and has been called TenneT TSO GmbH since then . The abbreviation TSO on behalf means Transmission System Operators ( english transmission system operator ).

The sole shareholder of TenneT TSO GmbH has been the German TenneT GmbH & Co. KG since 2010 , which is owned by the Dutch TenneT Holding BV through several intermediate companies . For TenneT GmbH & Co. KG further investments and subsidiaries are in Germany, u. a. the TenneT Offshore GmbH . TenneT Holding is owned by the Kingdom of the Netherlands ; the Dutch Ministry of Finance holds the stake .


Legal mandate and certification

Ganderkesee substation in Lower Saxony
German transmission network: control areas from Amprion , TenneT, TransnetBW and 50Hertz

As a transmission system operator, TenneT TSO is a service company with a statutory mandate. This arises from the "Tasks of the network operators" formulated in Section 11 ff. Of the Energy Industry Act (EnWG). The focus is on the non-discriminatory operation of a safe, reliable and powerful energy supply network as well as its optimization and expansion.

As a transmission system operator, TenneT TSO is subject to competition policy regulation by the Federal Network Agency . In 2015, after initial complications due to a lack of evidence of the necessary financial resources, it granted the company certification as an ownership unbundled transport network operator in accordance with Section 8 EnWG .

Network area and facilities

The transmission lines of the TenneT TSO are mainly to be found in the federal states of Bavaria, Bremen , Hesse , Lower Saxony and Schleswig-Holstein as well as in parts of North Rhine-Westphalia . The company operates 123  high-voltage substations (as of 2018) and two switching lines in Lehrte-Ahlten and Dachau . There are two operating centers in Lehrte-Ahlten and Bayreuth.

Integration into the European network

The transmission network of the TenneT TSO is part of the European network and, with its geographical location in Central Europe, has an important transfer position. There are transfer points to the neighboring transmission system operators in Germany and in the neighboring countries of Denmark ( Energinet.dk ), the Netherlands (TenneT), the Czech Republic ( ČEPS ) and Austria ( APG ).

The TenneT TSO is one of the four German member companies in the ENTSO-E .

Network expansion

TenneT TSO is responsible for several network expansion projects in accordance with the Energy Line Expansion Act and the Federal Demand Plan Act. These include u. a. the West Coast Line and the Dörpen / West – Wesel line (together with Amprion ) and the high-voltage direct current transmission projects SuedLink (together with TransnetBW ) and SuedOstLink (together with 50Hertz ).


In 2006 E.ON Netz in Schleswig-Holstein started a field test for overhead line monitoring on the 110 kV line Niebüll - Flensburg and was able to increase the transmission capacity there by up to 50 percent depending on the weather. As of 2011, Tennet TSO had converted more than 900 km of extra-high voltage lines and 20 substations from Hamburg to Giessen to overhead line monitoring using 55 million euros in investments .

Similar to NortH2 , Tennet wants to build several large electrolysis plants with a total of 100 megawatts in Diele, Lower Saxony, together with the long- distance network operator Thyssengas and Gasunie in Germany in a large Power-To-X project.

Web links

Commons : TenneT TSO  - Collection of Images

Individual evidence

  1. Additional CSR data 2019. CSR data linked to Integrated Annual Report 2019. (PDF) TenneT Holding BV, March 11, 2019, accessed on March 20, 2020 (English).
  2. Integrated Annual Report 2019. (PDF) TenneT Holding BV, March 2020, accessed on March 20, 2020 (English).
  3. Additional CSR data 2019. CSR data linked to Integrated Annual Report 2019. (PDF) TenneT Holding BV, March 11, 2020, accessed on March 20, 2020 (English).
  4. a b c E.ON sells high voltage network. Press release. E.ON SE, November 10, 2009, archived from the original on June 17, 2015 ; accessed on February 1, 2018 .
  5. Antitrust law: Commission welcomes proposals from E.ON on structural remedial measures to strengthen competition on the German electricity market. MEMO / 08/132. In: europa.eu. February 28, 2008, accessed February 3, 2018 .
  6. a b Antitrust law: Commission opens the German electricity market to competition. IP / 08/1774. In: europa.eu. November 26, 2008, accessed February 4, 2018 .
  7. Decision of the Commission in proceedings under Article 82 of the EC Treaty and Article 54 of the EEC Agreement. (PDF) Cases COMP 39.388 German electricity wholesale market and COMP 39.389 German balancing energy market. In: ec.europa.eu. November 26, 2008, accessed on February 7, 2018 (therein in Section 6 Summary of Commitments).
  8. a b transpower stromtransmission gmbh - independent company for the transmission network of E.ON. Press release. transpower current transmission gmbh, May 6, 2009, archived from the original on July 26, 2009 ; accessed on February 1, 2018 .
  9. See: Announcement of the resolution of the shareholders' meeting of April 21, 2009 of E.ON Energie 40. Beteiligungs-GmbH, Munich (capital increase and change of the company to transpower stromtransmission GmbH, GF appointment) at the Munich Local Court of May 5, 2009, File number: HRB 171458, available in the Electronic Federal Gazette ( company register ). See also: Announcement of the entry dated December 21, 2007 of E.ON Energie 40. Beteiligungs-GmbH, Munich at the Munich District Court of January 2, 2008, file number: HRB 171458, also available in the Electronic Federal Gazette.
  10. a b c Decision in the administrative procedure due to the certification of a transport network operator (certification procedure according to §§ 4a ff. EnWG to prove compliance with the unbundling or organizational requirements by the transport network operator). (PDF) Az BK6-12-047. Ruling Chamber 6 of the Federal Network Agency , August 3, 2015, accessed on February 2, 2018 .
  11. a b E.ON extra-high voltage grid definitely acquired by TenneT. TenneT Holding BV, February 25, 2010, archived from the original on September 26, 2011 ; accessed on February 3, 2018 .
  12. transpower becomes TenneT. TenneT TSO GmbH, October 8, 2010, accessed on February 1, 2018 .
  13. a b TenneT Group legal overview. (PDF) Organization chart. In: tennet.eu. December 31, 2017, accessed February 3, 2018 .
  14. Additional CSR data 2018. CSR data linked to Integrated Annual Report 2018. (PDF) TenneT TSO BV, February 21, 2019, p. 4 , accessed on March 21, 2019 (English).
  15. ENTSO-E Member Companies. In: entsoe.eu. Retrieved February 1, 2018 .
  16. Overhead line monitoring. (PDF; 306 kB) E.ON Netz GmbH, September 2007, archived from the original on June 17, 2015 ; accessed on February 3, 2018 .
  17. Overhead line monitoring. Optimal capacity utilization of overhead lines. (PDF; 666 kB) TenneT TSO BV, November 2010, accessed on February 3, 2018 .