In Denmark, as in Europe in general, the energy transition presents new and challenging tasks for the players in the energy sector. To improve the information basis and to prepare adequately for these challenges, TSCNET customer Energinet, the Danish transmission system operator (TSO), has created two reports on long-term development needs in the Danish energy system. There are two reports, as Energinet is not only the national TSO for electricity, but also for gas.
The forecasts in “Long-term Development Needs in the Power Grid” are similar to those of other European TSOs and allow similar conclusions. Not surprisingly, Denmark, as a world leader in renewable energy, needs to make even greater efforts to integrate these amounts of energy from renewable sources. In concrete terms, the TSO expects that by 2040 the maximum generation of wind turbines and solar cells could increase from 7.4GW today to perhaps 26GW. Such a tripling or quadrupling will cause problems for the current high-voltage grid, which is not designed to transmit such large amounts of energy.
Some challenges may not be due for 10-20 years, but others are already on the doorstep. In some places in Denmark, large-scale local production from wind and solar energy is already putting a considerable strain on the power grid. Hanne Storm Edlefsen, Head of the Strategic Planning division in Energinet Elsystemansvar, the TSO’s electricity system operator branch, emphasises the need for cooperation at all economic, political, and social levels to make the green transition a success and, for example, to ensure that “a doubling of electricity demand does not mean twice as many power pylons and overhead lines”.
The analyses show, among other things, the locations in Denmark where high-voltage grid extensions are required, either as underground cables or overhead lines. However, Edlefsen also points to other solution approaches beyond mere expansion: The proper placement of wind farms or large photovoltaic systems can reduce the need for grid reinforcement. And electrolysis plants of the future, which convert green electricity into hydrogen and other green fuels, could be located close to major green generation units so that electricity need not be transported across the country.