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TransnetBW completes line construction on Ultranet north-south power link

TransnetBW completes line construction on Ultranet north-south power link

Built World

42-km southern section done; first power flow targeted for end of 2026

Today: TransnetBW completes B1 line construction

Overview

Updated 1 hour ago

TransnetBW has finished building the 42-kilometer southern section of the Ultranet direct-current line between Mannheim-Wallstadt and Philippsburg. The work completes the last stretch of the roughly 340-kilometer link that will carry up to 2 gigawatts of electricity in both directions.

Ultranet is one of four major north-south power corridors Germany is building to move North Sea wind energy to industrial consumers in the south. It was originally scheduled to go live in 2017; first power flow is now targeted for the end of 2026.

Why it matters

Ultranet will move 2 GW of North Sea wind power to southern Germany's industrial centers, a key step in the country's coal and nuclear phase-out.

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Key Indicators

2 GW
Transmission capacity
Bidirectional capacity of the Ultranet HVDC link.
340 km
Total line length
Runs from Meerbusch-Osterath in North Rhine-Westphalia to Philippsburg in Baden-Württemberg.
42 km
B1 section length
The southern section between Mannheim-Wallstadt and Philippsburg, now complete.
9 years
Delay from original target
Ultranet was originally scheduled to go into operation in 2017.

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Organizations Involved

Timeline

2017 October 2026

6 events Latest: Today
Tap a bar to jump to that date
  1. TransnetBW completes B1 line construction

    Today Construction

    The 42-km southern section between Mannheim-Wallstadt and Philippsburg is finished.

  2. Ultranet fully approved by Bundesnetzagentur

    Regulatory

    The entire 342-km line receives final approval, clearing the way for construction on all sections.

  3. Stringing work starts with helicopter assistance

    Construction

    Zubeseilung begins between Heidelberg-Neurott and Philippsburg using helicopters to pull pilot lines.

  4. Construction begins on B1 section

    Construction

    Freileitungsbau starts between Mannheim-Wallstadt and Philippsburg.

  5. Bundesnetzagentur approves B1 section plan

    Regulatory

    Plan approval for the 42-km southern section between Mannheim-Wallstadt and Philippsburg.

  6. Ultranet originally scheduled to go into operation

    Planning

    The link was initially planned to be operational in 2017.

Scenarios

1

Ultranet delivers first power by end of 2026

Likely Resolves by End of 2026

Discussed by: TransnetBW and Amprion project schedules

The remaining work is testing and commissioning of the converter stations at Osterath and Philippsburg. If those pass, the line goes live as planned. TransnetBW says the project is on track for end of 2026.

2

Ultranet commissioning slips into 2027

Possible Resolves by Q1 2027

Discussed by: NDR analysis of German grid expansion delays

German HVDC projects have a pattern of multi-year delays. Converter station testing or grid connection issues could push first power flow into 2027. NDR data shows only 37% of planned new lines are complete as of October 2026.

3

Ultranet starts at reduced capacity

Possible Resolves by Q2 2027

Discussed by: Grid operators' phased commissioning practice

HVDC links often ramp up gradually. Initial operation may carry less than the full 2 GW while converter stations are tuned and tested under load.

Historical Context

2 moments from history that rhyme with this story — and how they unfolded.

2019-2028

SuedLink (2019-2028)

SuedLink is the other major north-south HVDC corridor, running from the North Sea coast to Bavaria. Its two strands were originally due in 2019 and 2022; both are now targeted for end of 2028.

Then

The delays forced Germany to rely on grid redispatch and emergency measures to keep the south supplied.

Now

SuedLink's timeline shows the systemic difficulty of building new transmission corridors through populated regions.

Why this matters now

Ultranet follows the same pattern: originally due in 2017, now targeted for end of 2026.

2020-2027

A-Nord (2020-2027)

A-Nord, the third major north-south link, was originally scheduled for 2020. It is now expected mid-2027.

Then

The project faced permitting delays and local opposition.

Now

All four major German HVDC corridors are running years behind their original schedules.

Why this matters now

A-Nord's delay history mirrors Ultranet's, showing the delays are systemic rather than project-specific.

Sources

(7)