In early February of this year, the four German transmission system operators (TSOs) and TSCNET shareholders 50Hertz, Amprion, TenneT, and TransnetBW had submitted the first draft of the new 2019 version of their “Grid Development Plan (GDP) 2030” together with the Offshore GDP to the German Federal Network Agency. Both GDPs were also published for a four-week public consultation. The total of 906 comments and proposals on both GDPs have been incorporated into the second draft of the two GDPs, whenever purposeful and reasonable. This second draft has now been forwarded to the Agency and published on the joint GDP website.
While all the different scenarios of the GDP 2030 meet the official German target of 65 percent for renewable energies in gross electricity consumption, they differ in terms of technologies as well as storage and flexibility options. The TSOs respond in the GDP to the increase in the required transport capacity due to the gap in the German electricity market with the renewable generation mainly in the north and the consumption centres in the south and west. For the second draft of the GDP 2030, the TSOs have taken greater account of the possible German coal exit to ensure that the grid development measures identified in the scenarios are appropriate even in the case of an early and complete phase-out.
In all scenarios for 2030, the transmission capacity of the DC connections amounts to a total of 12GW, while the concrete figures for the need for grid reinforcements (2750 to 2800km) and new construction measures (1600 to 1700km) differ slightly. In the second draft of GDP, the TSOs carried out a cost-benefit analysis for a total of eight interconnectors and a reassessment of system stability. This analysis reveals a considerable need for reactive power compensation systems. As a result, the costs for onshore measures in scenario B 2030 increase from €52bn to €61bn compared to the first draft. The Network Agency will now evaluate the revised draft and adapt its own planning, which then must be confirmed by the Federal Government in the official Federal Requirements Plan.