Energinet Secures €5 Million Contract for 150 kV Harmonic Filters for Onshore Outdoor Installation

A contract for the purchase of two 150 kV harmonic filters worth €5 million has been awarded by Energinet Eltransmission A/S. The contract, won by Siemens Energy A/S, demonstrates how Denmark's transmission system operator is investing in power quality infrastructure to ensure grid stability and reliability across the electricity network in Nordjylland.

Introduction

Every megawatt of electricity transmitted across Denmark's high-voltage grid depends on power quality equipment to maintain stability and reliability. Harmonic filters are essential for mitigating harmonic distortion caused by power electronic devices, ensuring that electricity meets quality standards. Energinet Eltransmission A/S, Denmark's transmission system operator, has taken a significant step to enhance power quality by awarding a new contract for the purchase of two 150 kV harmonic filters for onshore outdoor installation in Nordjylland.

While not a headline-grabbing consumer deal, this contract is fundamental to ensuring the stability and reliability of Denmark's electricity transmission network. It reveals a great deal about how Danish transmission system operators procure specialised power quality equipment through competitive procurement.

Why This Contract Matters

Energinet Eltransmission A/S is Denmark's transmission system operator (TSO), responsible for operating and maintaining the country's high-voltage electricity transmission grid. The company ensures that electricity is reliably transmitted from producers to consumers across Denmark, including integrating renewable energy sources.

Harmonic filters are critical infrastructure that mitigate harmonic distortion in the power grid. Harmonics are voltage or current waveforms at frequencies that are integer multiples of the fundamental frequency (50 Hz), caused by non-linear loads such as power electronic devices, variable frequency drives, and renewable energy converters. Excessive harmonic distortion can reduce equipment lifespan, increase losses, and cause operational issues. The two 150 kV filters will be installed at transformer stations in Nordjylland at Kraghedemølle and Abildbak (ABA).

Contract Timeline

• Contract award notice published: 3 August 2026 (OJ S 147/2026)
• Contract concluded: 26 June 2026

Contract Overview

Energinet Eltransmission A/S conducted a negotiated procedure with prior publication of a call for competition (competitive with negotiation) for the purchase of two 150 kV harmonic filters for onshore outdoor installation in Nordjylland. The filters will be installed at the Kraghedemølle transformer station and the Abildbak (ABA) station.

The total contract value awarded is €5,000,000. The procurement received two tenders, with Siemens Energy A/S selected as the winner. The award criteria were weighted: price (45%), solution description (30%), sound level (10%), and contract terms (15%). The tender included detailed technical specifications and quality requirements.

Key Contract Details

Detail	Information
Contracting Authority	Energinet Eltransmission A/S
Winning Bidder	Siemens Energy A/S
Contract Subject	Electric motors, generators and transformers (CPV 31100000)
Procedure Type	Negotiated with prior publication / competitive with negotiation
Legal Basis	Directive 2014/25/EU
Value of Contract Awarded	€5,000,000.00
Tender Range	€5,659,771 – €7,033,810
Number of Filters	2
Voltage Level	150 kV
Installation Locations	Kraghedemølle (Tylstrup) and Abildbak (Gandrup), Nordjylland
Award Criteria	Price (45%), Solution Description (30%), Sound Level (10%), Contract Terms (15%)
Bids Received	2
EU Funding	None disclosed
Covered by GPA	Yes
Review Organisation	Klagenævnet for Udbud

Project Scope

The contract covers the purchase of two 150 kV harmonic filters for onshore outdoor installation. The scope includes:

• Filter Supply: Supply of two complete 150 kV harmonic filter systems.
• Technical Specifications: Filters must meet detailed technical specifications for harmonic performance, including filtering of specific harmonic orders.
• Installation: Onshore outdoor installation at two transformer stations in Nordjylland.
• Site Locations:
  • Kraghedemølle transformer station, Tylstrup (Kraghedevej, matr. 7b)
  • Abildbak station (ABA), Gandrup (Nejsigvej, matr. 8b)
• Sound Level Requirements: The filters must meet specified sound level limits, with the sound level evaluated as part of the quality criteria.
• Design and Layout: Detailed design and layout drawings of the filter solution.
• Factory and Site Acceptance Testing (FAT & SAT): Procedures for testing and verification of filter performance.

About the Contracting Authority

Energinet Eltransmission A/S is Denmark's transmission system operator (TSO), responsible for operating and maintaining the country's high-voltage electricity transmission grid. The company ensures that electricity is reliably transmitted from producers to consumers across Denmark, including integrating increasing amounts of renewable energy from wind and solar sources. Energinet is a public undertaking, and its transmission activities are regulated to ensure security of supply and efficient operation of the electricity grid.

About the Winning Company

Siemens Energy A/S is the Danish subsidiary of Siemens Energy AG, a global leader in energy technology. Siemens Energy provides a comprehensive range of products, solutions, and services for electricity generation, transmission, and industrial applications. The company has extensive expertise in high-voltage equipment, including harmonic filters, power transformers, and grid stability solutions. With a strong presence in Denmark and deep experience in grid infrastructure projects, Siemens Energy is well-positioned to deliver the two 150 kV harmonic filters for Energinet.

Procurement Analysis

Procedure: A negotiated procedure with prior publication of a call for competition (competitive with negotiation) was used. This procedure allows the contracting authority to negotiate with shortlisted candidates to refine their offers before selecting the winner. Two tenders were received.

Competition: Two bids were received for this contract, reflecting the specialised nature of high-voltage harmonic filter supply. The tender range was €5,659,771 to €7,033,810, with the winning bid being the lower of the two.

Award Criteria:

• Price (45%): The total cost of the filters, with prices stated in EUR.
• Solution Description (30%): The quality and specificity of the proposed technical solution, including filter performance, footprint (size), low-profile design, FAT & SAT procedures, and overall design robustness.
• Sound Level (10%): The guaranteed sound power level of the filters, with detailed scoring based on how much lower than the maximum allowed level the tenderer can guarantee.
• Contract Terms (15%): Proposed deviations to the contractual terms, with absolute fulfillment resulting in the maximum score.

Quality Emphasis: The combined 55% weighting for quality criteria (solution description, sound level, and contract terms) reflects the importance of technical quality, sound performance, and contractual compliance in high-voltage equipment procurement. The detailed quality criteria ensure that the selected filter solution meets the operational and environmental requirements of Energinet.

Sound Level Criteria: The sound level criterion includes a detailed scoring methodology, rewarding tenderers who can provide solutions with sound levels significantly lower than the maximum allowed. This reflects the importance of environmental considerations in equipment installed near residential areas.

Negotiated Procedure: The negotiated procedure allowed Energinet to engage with bidders to ensure that the technical solutions met the specific requirements of the project.

GPA Status: The procurement is covered by the World Trade Organization's Government Procurement Agreement (GPA), meaning it was, in principle, open to qualifying international bidders.

Additional Procurement Facts

• Two tenders were received for this procurement.
• The contract value is €5 million.
• No subcontracting was used by the winning bidder.
• No EU funding was used for this procurement.
• Disputes or review requests fall to the Klagenævnet for Udbud (Public Procurement Complaints Board).

Market & Industry Perspective

The high-voltage equipment market is specialised, with a limited number of global suppliers capable of delivering complex harmonic filter solutions. The two bids received for this contract reflect the specialised nature of the market.

The detailed quality criteria reflect the importance of technical performance, environmental sound levels, and contractual compliance in grid infrastructure procurement. The negotiated procedure allows the contracting authority to ensure that the technical solutions meet the specific requirements of the project.

The installation of harmonic filters is increasingly important as renewable energy sources (wind, solar) are integrated into the grid, as these sources introduce harmonic distortion that must be managed to maintain grid stability and power quality.

Economic Significance

At €5 million, this contract represents a significant investment in power quality infrastructure for Denmark's transmission grid. The two 150 kV harmonic filters will ensure that the Nordjylland region maintains high power quality, supporting grid stability and the integration of renewable energy sources.

For Siemens Energy A/S, the contract provides a revenue stream and the opportunity to demonstrate its harmonic filter expertise in the Danish transmission sector.

Future Procurement Opportunities

This contract covers two harmonic filters. Related procurement opportunities may include:

• Additional harmonic filters for other transformer stations
• Power transformers and other high-voltage equipment
• Grid stability and power quality solutions
• Renewable energy integration infrastructure

Opportunities for Suppliers

High-voltage equipment suppliers active in the Danish energy sector should note the emphasis on quality criteria (55% combined) in this procurement. Suppliers must demonstrate strong technical capabilities, sound performance, and contractual compliance alongside competitive pricing.

Key success factors include: proven experience in high-voltage filter design and manufacture, technical excellence, sound level performance, competitive pricing, and willingness to accept contract terms.

What Businesses Should Watch

• Similar power quality equipment opportunities from Energinet and other TSOs.
• The evolution of grid requirements and power quality standards.
• Opportunities for subcontracting or partnership with Siemens Energy.
• Other transmission infrastructure projects in Denmark and the Nordic region.

DenmarkTender Procurement Intelligence

This contract is a useful case study in how Danish transmission system operators procure specialised power quality equipment. Energinet has secured a €5 million contract for two 150 kV harmonic filters, with Siemens Energy A/S selected through a negotiated procedure with detailed quality criteria.

The most notable feature of this tender is the detailed quality criteria, which account for 55% of the award weighting (solution description 30%, sound level 10%, and contract terms 15%). This reflects the importance of technical quality, environmental performance, and contractual compliance in high-voltage equipment procurement. The sound level criterion, with its detailed scoring methodology, is particularly noteworthy and reflects the importance of environmental considerations in equipment installed near residential areas.

The negotiated procedure allowed Energinet to engage with bidders to ensure that the technical solutions met the specific requirements of the project, which is common for complex technical procurements where solutions may vary significantly between suppliers.

The two bids received reflect the specialised nature of the market, with only a limited number of suppliers capable of delivering complex harmonic filter solutions at this voltage level.

For suppliers, the lesson is that technical quality, environmental performance (sound levels), and contractual compliance are as important as price in high-voltage equipment procurement. Companies that can demonstrate strong technical capabilities, low sound levels, and willingness to accept contract terms are best positioned for these contracts.

Supplier Takeaways

• Price (45%) is important but not the only factor.
• Quality (55% combined) is critical: solution description (30%), sound level (10%), contract terms (15%).
• Sound level performance is specifically rewarded with a detailed scoring methodology.
• Contractual compliance (no deviations) results in maximum score for contract terms.
• Specialised market – limited number of qualified suppliers.
• Negotiated procedure allows for technical dialogue.

Key Takeaways

• Energinet awarded a €5 million contract for two 150 kV harmonic filters to Siemens Energy A/S.
• The filters will be installed at transformer stations in Nordjylland (Kraghedemølle and Abildbak).
• Award criteria: Price (45%), Solution Description (30%), Sound Level (10%), Contract Terms (15%).
• Two bids were received, with a global energy technology company winning.
• The contract supports grid stability and power quality in Denmark's transmission network.
• Sound level performance was specifically evaluated with a detailed scoring methodology.

Conclusion

This is not a contract that will make national headlines, but it reflects something structurally important about how Denmark invests in power quality infrastructure to support its electricity transmission network. By awarding a €5 million contract for two 150 kV harmonic filters to Siemens Energy A/S, Energinet ensures that the Nordjylland region maintains high power quality, supporting grid stability and the integration of renewable energy sources. The contract demonstrates the importance of technical quality, environmental performance, and contractual compliance in high-voltage equipment procurement.

Frequently Asked Questions

Q: What is Energinet Eltransmission A/S?

It is Denmark's transmission system operator (TSO), responsible for operating and maintaining the country's high-voltage electricity transmission grid.

Q: What are harmonic filters?

Harmonic filters are devices that mitigate harmonic distortion in the power grid, which is caused by non-linear loads such as power electronic devices and renewable energy converters.

Q: Where will the filters be installed?

At the Kraghedemølle transformer station in Tylstrup and the Abildbak station (ABA) in Gandrup, both in Nordjylland, Denmark.

Q: Who is the winning bidder?

Siemens Energy A/S, the Danish subsidiary of Siemens Energy AG, a global leader in energy technology.

Q: Is this contract funded by the EU?

No. The notice confirms the project is not financed with EU funds, though it is governed by EU Directive 2014/25/EU.

Source: EU Official Journal, Contract Award Notice 535105-2026, OJ S 147/2026, published 3 Aug 2026.