Abstract: . . .  transmission network, 4 there are various bottlenecks to rapid implementation. Compared with the new construction of recent years, the timeframe for necessary network extension is very ambitious. In order not to endanger the further development of wind power, not only the immediate ongoing implementation of planning and investment decisions, but also in particular the legal approval procedures for network extension must be accelerated. In the future, a denser network of extra high voltage transmission lines could also be used for additional activities in energy trading. However, this issue has not been . . .
. . .  network extension of the extra high voltage transmission network between 2007 and 2010 Page 22 22 Figure 3: Grid upgrades and network extension between 2010 and 2015 Page 23 23 Figure 4: System model for the grid connection of offshore wind farms in the North Sea and grouping of the submarine cables in the coastal area  . . .
. . .  the extra high voltage transmission network up to 2007 Page 21 21 Figure 2: Grid upgrades and network extension of the extra high voltage transmission network between 2007 and 2010 Page 22 22 Figure 3: Grid upgrades and network extension between 2010 and 2015 Page 23 23 Figure 4: System model for the grid connection of offshore wind farms in the North Sea and grouping of the submarine cables in the coastal area  . . .
. . .  calculations up to 2015 form the basis for the investigations in the section of the study titled “Grids” and “Power Stations”. The forecast up to 2020 is to be investigated and examined in detail in the context of the projected part II of the dena grid study. 4. Grid Upgrade and Grid Extension For the further integration of renewable energy sources into the interconnected power system, an extension of the extra high voltage transmission network will be necessary. This will include an upgrading of existing overhead lines, the construction of new extra high voltage lines, the implementation of quadrature-regulators . . .
. . .  transmission network up to 2007 Page 21 21 Figure 2: Grid upgrades and network extension of the extra high voltage transmission network between 2007 and 2010 Page 22 22 Figure 3: Grid upgrades and network extension between 2010 and 2015 Page 23 23 Figure 4: System model for the grid connection of offshore wind farms in the North Sea and grouping of the submarine cables in the coastal area  . . .
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