New Dena Grid Study II Published

Dena today published its new grid study “dena-Netzstudie II”. In its base scenario, 3,600 km of new extra high voltage lines have to be built by 2020/2025, at a cost of EUR 9.7 billion. Alternative scenarios would cost up to EUR 29 billion.

In its first Grid Study from 2005, dena had identified a need for 850 km of new lines until 2015. So far, only 90 km have been built.

The new Grid Study II looks into how the German electricity grid has to be expanded and optimised until 2020/2025. The study is based on three aims

  1. Integration of 39% renewable energy electricity generation;
  2. Optimal economic use of conventional power plants
  3. Increasing European electricity trade.

In addition to a base scenario with conventional use of the transmission assets, the study assesses two scenarios using different technologies, one using overhead line temperature monitoring (Freileitungsmonitoring), the other high temperature conductor cables (Hochtemperaturseile). The study also assesses high voltage direct current underground power cables (erdverlegte Gleichspannungstrassen). Until 2020, the scenarios lead to the following results:

  • Conventional 380 kV scenario: 3,600 km of new lines, at a cost of EUR 9.7 billion;
  • Temperature monitoring scenario: 3.500 km of new lines, upgrading of 3,100 km of existing lines, at a cost of EUR 9.8 billion;
  • High temperature conductor cable scenario: 1,700 km of new lines,  upgrading of 5,700 km of existing lines, at a cost of EUR 17 billion;
  • High voltage direct current underground scenario: 3,400 km of new lines, at a cost of EUR 22 to 29 billion.

According to dena, the extension of the operating times of the German nuclear power plants does not substantially affect the need for new extra high voltage lines.

As a result of its study, dena makes the following recommendations

  • Thorough assessment and planning of specific network expansion;
  • Acceleration of permitting procedures and improvement of the legal framework;
  • Measures to increase public acceptance for the necessary network expansion;
  • Assessment of alternative transmission technologies in the framework of future network planning;
  • Implementation of pilot projects for the use of selected technologies.

Source: dena

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