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Terna begins laying submarine cables for Sicily-Calabria power link

Terna begins laying submarine cables for Sicily-Calabria power link

Built World

The 380 kV Bolano-Annunziata line adds 2,000 MW of exchange capacity between the island and the mainland

Today: Terna confirms first cable laid

Overview

Updated 58 minutes ago

Terna has started laying submarine cables across the Strait of Messina for the Bolano-Annunziata power line, a 380 kV link that will add up to 2,000 MW of exchange capacity between Sicily and mainland Italy. Two of the three cables are already in place or nearly so; the third should go down by early November.

Sicily's wind and solar output has outgrown what its current links can export to the mainland, so the extra headroom lets island renewables reach the national grid. The work also includes new underground lines and substation upgrades at both ends, part of Terna's longer push to integrate southern Italian renewables.

Why it matters

At up to 2,000 MW, this link nearly doubles Sicily's power trade with the mainland, giving island wind and solar a real path to market.

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Key Indicators

2,000 MW
Added Sicily–mainland exchange capacity
Total new headroom the Bolano-Annunziata line adds to the island's grid ties.
7.5 km
Length of each submarine cable
Three cables cross the strait between Bolano and Annunziata at up to 250 m depth.
€105 million
Terna's investment in the link
Per Terna's announcement, covering submarine, land and substation works.
3
Submarine cables to be laid
Two are installed or nearly so; the third is due by early November.

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People Involved

Organizations Involved

Timeline

2024 October 2026

4 events Latest: Today
Tap a bar to jump to that date
  1. Terna confirms first cable laid

    Today Milestone

    First submarine cable in place between Bolano and Annunziata; second nearly done. Crews recovered a Greco-Italic amphora from the seabed and handed it to heritage authorities.

  2. Cable-laying ship arrives off Messina

    Construction

    Prysmian's Leonardo da Vinci vessel begins laying operations in the strait, with work authorized through November 15.

  3. Seabed preparation begins in the Strait of Messina

    Construction

    Pre-lay grapnel runs clear debris from the cable route through the end of October; vessels must stay 500 m clear.

  4. MASE authorizes Bolano-Annunziata link

    Regulatory

    Italy's environment ministry approves the 380 kV submarine link between Sicily and Calabria.

Scenarios

1

Bolano-Annunziata link energized in 2027

Possible Resolves by End of 2027

Discussed by: Terna's development plan and Italian energy press

Cable laying finishes by early November 2026 without incident. The 3 km Sicilian land duct, the Calabrian stub, and the new Annunziata substation complete on schedule, and high-voltage testing wraps through 2027. Terna then announces commercial operation within the year.

2

Land works or cable testing push commissioning into 2028

Possible Resolves by Q2 2028

Discussed by: Engineering analysis of multi-year subsea builds

The cables install cleanly, but the Sicilian land duct, the new substation, or high-voltage testing runs long. Terna revises its in-service date to 2028 or later.

3

A defective cable section forces rework

Unlikely Resolves by Q2 2027

Discussed by: Outage reports on comparable XLPE subsea links

Pre-energization testing finds a fault in one of the three cables. Prysmian and Terna replace or splice the affected section, adding months to the schedule.

Historical Context

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

2016

Sorgente-Rizziconi (2016)

Terna put into service a 380 kV alternating-current submarine link between Sicily and Calabria, at the time the largest such tie across the Strait of Messina. It gave the island a much stronger export path to the mainland.

Then

Sicily's power trade with the continent jumped, easing congestion on older links.

Now

It set the technical pattern, 380 kV alternating current subsea, that Bolano-Annunziata repeats with newer cable technology.

Why this matters now

The new project sits in the same corridor and answers the same problem: Sicily's generation capacity keeps outgrowing its export links.

1980s

Bolano-Paradiso (1980s)

An earlier 380 kV alternating-current submarine tie between Calabria and Sicily entered service in the 1980s, giving the strait one of its first major subsea power connections.

Then

Gave Sicily a second major mainland connection when built.

Now

Still operates today as one of the corridor's two existing links, alongside Sorgente-Rizziconi.

Why this matters now

The new line shares the Bolano landing point in Calabria and adds capacity beside the aging infrastructure rather than replacing it directly.

Sources

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