German Grid Curtailment
Wind blows in the north. Factories run in the south. The wires between them cannot cope. Germany curtails 9+ TWh of clean energy per year — and pays billions for the privilege.
A Grid Designed for a Different Era
Germany's grid was built for centralized generation: large coal, nuclear, and gas plants feeding power top-down through high-voltage lines. The Energiewende has inverted this model. Over 1.7 million solar installations and 29,000+ onshore wind turbines now push power bottom-up into a grid never designed for bidirectional flow.
The transmission grid spans approximately 38,500 km at 220/380 kV. While ranked among the world's most reliable, the infrastructure is under increasing strain from a generation landscape it was never designed to accommodate.
The North-South Bottleneck
Wind generation concentrates in the north — the North Sea coast, Baltic coast, Schleswig-Holstein, and Lower Saxony. Industrial demand concentrates in the south — Bavaria, Baden-Württemberg, and North Rhine-Westphalia. When strong winds blow in the north, the grid physically cannot transport all the electricity south.
The result: wind farms in the north are told to stop producing. Gas plants in the south are told to ramp up. Consumers pay for both — the clean energy that was wasted and the fossil energy that replaced it.
Germany's Four TSOs
| TSO | Region | Key Characteristics |
|---|---|---|
| 50Hertz | North and East | Baltic offshore wind, high wind penetration |
| TenneT | Central (north-south) | Dutch-owned, operates SuedLink |
| Amprion | West and Southwest | 11,000 km of grid, major industrial load |
| TransnetBW | Baden-Württemberg | Smallest area, high demand, limited local generation |
Below the four TSOs, over 860 DSOs operate 1.8 million km of distribution grid — a highly fragmented landscape from large utilities to small municipal Stadtwerke.
The "Electricity Highways"
Germany has four planned HVDC corridors to solve the bottleneck. Combined construction costs are estimated between EUR 8-20 billion. A EUR 6.5 billion federal subsidy was approved in December 2025 to contain costs.
| Project | Route | Capacity | Expected |
|---|---|---|---|
| SuedLink | Schleswig-Holstein to Bavaria | 2 GW | 2028 |
| SuedOstLink | Saxony-Anhalt to Bavaria | 2 GW | 2027-2028 |
| A-Nord | Emden to Osterath | 2 GW | Under construction |
| Ultranet | Osterath to Philippsburg | 2 GW | Approved |
Of Germany's planned 16,800 km of grid extensions, only about 3,500 km had been built by mid-2025. The critical HVDC corridors are years away. Until then, curtailment and redispatch costs continue mounting.
The Scale of Waste
| Source | 2024 Curtailment | Change |
|---|---|---|
| Offshore wind | 4,562 GWh | Down 20% |
| Onshore wind | 3,384 GWh | Down 15% |
| Solar | 1,389 GWh | Up 97% |
| Total | ~9.3 TWh | 3.5% of total generation |
Solar curtailment surged 97% year-over-year in 2024 to 1,389 GWh, driven by rapidly increasing installed capacity. Curtailment payments reached EUR 554 million. The record was set in 2023 at 10 TWh.
Redispatch costs more than doubled since 2019, averaging EUR 6.8/MWh of net electricity consumption in 2023 (source: BNetzA). Germany's remedial action volume hit 6.7% of national demand. These costs represent a fifteen-fold increase over the last decade.
The VPP Opportunity
VPPs address curtailment by consuming excess renewable energy locally — charging batteries when the grid cannot absorb supply, and discharging when demand peaks. Instead of building EUR 20 billion in HVDC corridors, distributed storage can solve part of the problem faster and cheaper.
Every home battery that absorbs midday solar surplus — as Enpal and Flexa coordinate across 40,000+ households — is one less megawatt-hour that needs to travel from north to south on overloaded transmission lines.