ALEGrO

ALEGrO
Name	ALEGrO
Type	High-voltage direct current interconnector
Status	Operational
Locale	Belgium–Germany border
Start	Lixhe
End	Aachen
Owner	Elia (company) / Amprion
Operator	Elia (company) / Amprion
Open	2019
Length	90 km
Capacity	1000 MW
Voltage	380 kV DC

ALEGrO

ALEGrO is a high-voltage direct current (HVDC) electrical interconnector linking Belgium and Germany. It connects the Lixhe converter station in Belgium with the Aachen area in Germany and is operated jointly by Elia (company) and Amprion. The project entered service in 2020 and is intended to enhance cross-border electricity trade and grid stability between Elia (company), Amprion, TenneT, RWE, and other major European transmission system entities.

Introduction

ALEGrO is one of several cross-border projects developed under the framework set by European Commission energy initiatives and ENTSO-E coordination. It uses voltage-source converter (VSC) technology supplied by major manufacturers that have worked on projects for Siemens Energy, ABB, and GE Grid Solutions in comparable interconnection schemes such as NordLink, Nemo Link, BritNed, HVC, and INELFE. The interconnector is designed to facilitate market coupling and provide system services comparable to historic links like Baltic Cable and Interconnexion France–Italie.

History and Development

Planning for the interconnector drew on regulatory precedents from Council of the European Union directives and funding models involving the Connecting Europe Facility and national authorities such as Belgia authorities and Bundesnetzagentur. Early feasibility studies cited experiences from projects including HVDC BorWin, SeaLink, and ACE schemes. Consortium-level discussions included stakeholders from Elia (company), Amprion, investors comparable to KfW, and vendors with track records on TransBay Cable and NorNed. Construction commenced after permits from regional administrations in Liège province and North Rhine-Westphalia, and procurement contracts were awarded to suppliers with prior work for EnBW, E.ON, Iberdrola, and EDF.

Technical Specifications

ALEGrO uses a bipolar 320 kV (nominal 380 kV DC-equivalent) VSC system with a rated capacity of 1000 MW, comparable in class to converters used in NEMO Link and NordBalt. The link comprises underground and overhead sections, converter stations at Lixhe and near Aachen, and employs power electronics, transformers, smoothing reactors, and harmonic filters similar to installations delivered to Siemens Energy for HVDC Kontek and to ABB for SVC Plus projects. Protection schemes reference standards set by IEC, coordination with ENTSO-E grid codes, and testing protocols used by Cigré working groups. Control systems integrate telemetry and SCADA interfaces compatible with systems used by RTE, National Grid (UK), and TenneT.

Operations and Route

The route traverses terrestrial corridors from the Lixhe converter site near the Meuse (river) to the Aachen converter area, following rights-of-way coordinated with provincial planners in Liège and municipal authorities in Aachen. Operational dispatch is coordinated between Elia (company) and Amprion scheduling centers using market coupling procedures similar to those employed by European day-ahead market platforms and regional balancing mechanisms involving EPEX SPOT and ENTSO-E transparency platforms. The physical cable infrastructure interacts with adjacent assets owned by RWE, Engie, TotalEnergies, and local distribution operators in cross-border service arrangements.

Safety and Incidents

Safety management followed guidelines from International Electrotechnical Commission and incident response protocols aligned with national agencies such as Federal Network Agency (Germany) and Belgian authorities. During commissioning, ALEGrO underwent factory acceptance tests similar to protocols used for Nemo Link and BritNed; no major outages were reported in early operations, though routine maintenance events required temporary derating coordinated with regional transmission operators like Elia (company) and Amprion. Emergency planning referenced coordination practices observed in interconnectors such as HVDC Cross-Channel and contingency manuals used by ENTSO-E.

Economic and Environmental Impact

ALEGrO aims to increase market liquidity between Belgium and Germany, supporting trading floors used by EPEX SPOT, Bourse de Bruxelles, and companies including Siemens Energy, RWE, Engie, and EDF by enabling up to 1000 MW of transfers. Economic assessments cited parallels with benefits reported for Celtic Interconnector and NordLink in reducing congestion, integrating renewable generation from operators like EDF Renewables and E.ON Climate & Renewables, and lowering wholesale price volatility. Environmental impact studies coordinated with regional planning bodies in Liège and North Rhine-Westphalia referenced mitigation measures used in projects such as NortSea Link and Baltic Pipe to protect habitats and limit visual intrusion.

Future Plans and Upgrades

Future upgrades considered by Elia (company), Amprion, and European bodies include capacity optimization, converter firmware enhancements inspired by advances at Siemens Energy and ABB research centers, and integration with continental initiatives like ENTSO-E HVDC roadmaps and EU Green Deal objectives. Potential coordination with offshore transmission projects involving TenneT and Vattenfall could extend cross-border flexibility, while market design reforms by European Commission and regional regulators such as Bundesnetzagentur might affect utilization and curtailment rules.

Category:High-voltage direct current transmission lines Category:Electric power infrastructure in Belgium Category:Electric power infrastructure in Germany