Cenergy Holdings S.A. (Euronext Brussels and Euronext Athens: CENER) has added a €1.5 billion Corinth-Kos HVDC contract only weeks after Hellenic Cables secured a separate €1.15 billion framework agreement from Greece’s Independent Power Transmission Operator. Put together, the two IPTO awards are worth approximately €2.65 billion, creating a customer-concentration figure that is easy to miss when each infrastructure win is viewed separately.
Cenergy Holdings reported group backlog of approximately €3.9 billion at June 30, including the €1.15 billion IPTO framework award signed in late June. Adding the new €1.5 billion Corinth-Kos project mechanically takes that figure toward €5.4 billion, subject to the new contract satisfying customary statutory conditions and being reflected in the company’s backlog reporting. On that pro forma basis, the two IPTO awards would represent approximately 49% of the enlarged group backlog.
That is a materially different question from whether the Corinth-Kos contract is strategically important. Cenergy Holdings has unquestionably secured exceptional long-term workload. The next analytical issue is how much of that workload is now linked to one customer and one national grid-investment programme.
How did IPTO become almost half of Cenergy Holdings’ enlarged backlog?
The concentration developed rapidly. In late June, Hellenic Cables won Lot A of an IPTO framework agreement covering four island interconnections with an approximate value of €1.15 billion. That award helped push Cenergy Holdings’ June backlog to around €3.9 billion and the cables segment backlog to approximately €3.4 billion.
The August 13 Corinth-Kos award adds another approximately €1.5 billion. Hellenic Cables, through wholly owned subsidiary Fulgor S.A., will deliver the 320 kV HVDC system on an engineering, procurement, construction and installation basis. The scope includes approximately 1,260 kilometres of submarine cable and 30 kilometres of underground cable, with project commencement expected in the fourth quarter of 2026 and completion scheduled for 2030.
The combined €2.65 billion value is equivalent to roughly 2.3 times Cenergy Holdings’ entire €1.15 billion of H1 2026 revenue. The comparison does not imply the contracts will be recognised as revenue within a single year, but it demonstrates how dramatically two awards have changed the scale of future workload.
Why is the concentration even greater inside Hellenic Cables?
The group-level 49% calculation actually understates how significant IPTO has become for the cable business itself.
Hellenic Cables ended June with approximately €3.4 billion of backlog. Adding the €1.5 billion Corinth-Kos award produces an illustrative enlarged cable backlog of about €4.9 billion. The two recent IPTO awards, worth €2.65 billion combined, would consequently account for roughly 54% of that total.
That concentration matters because cables are already Cenergy Holdings’ principal earnings engine. The segment generated €841.7 million of H1 revenue and €164.4 million of adjusted EBITDA, producing a 19.5% adjusted EBITDA margin. It accounted for roughly three-quarters of group adjusted EBITDA during the period.
The encouraging side is that these are not speculative early-stage opportunities. They are major electricity-transmission projects associated with Greece’s regulated national grid operator, and both fit directly into Hellenic Cables’ recently expanded submarine and land-cable manufacturing capacity.
Does having nearly half the backlog tied to IPTO create a customer risk?
The concentration should not automatically be treated like conventional corporate customer concentration. IPTO is Greece’s electricity transmission system operator, while the underlying projects are strategic grid infrastructure designed to connect island systems with the mainland network and reduce reliance on local oil-fired generation. The Corinth-Kos link alone will provide 1 GW of transmission capacity to support integration of the Dodecanese islands.
The more relevant risk may be execution concentration. A large proportion of future cable activity will depend on milestones, permitting, manufacturing schedules, installation work and customer acceptance across a relatively small number of very large projects.
That can create quarterly volatility even when the long-term contracts remain intact. Cenergy Holdings has already cautioned that profitability can vary with project mix and phasing, while its backlog definition includes signed contracts as well as certain awarded contracts that have not yet become fully effective.
Why won’t the €2.65bn IPTO workload immediately transform 2026 earnings?
The timing is critical. Cenergy Holdings said production related to the €1.15 billion June IPTO framework award is expected to begin only in late 2027, meaning that contract strengthens medium-term workload rather than 2026 earnings. The Corinth-Kos project begins in the fourth quarter of 2026 but runs through 2030, spreading revenue recognition across several years.
Cenergy Holdings currently guides to €390 million to €420 million of adjusted EBITDA for 2026 after generating €216 million in H1. The new contracts therefore strengthen visibility beyond the current earnings year rather than providing justification for simply adding their value to near-term revenue forecasts.
Investors nevertheless appear to be assigning considerable value to that visibility. Cenergy Holdings closed August 14 at €23.18 in Brussels, up 1.05% for the session. The shares have gained about 15.7% over one month, more than 52% year to date and roughly doubled over the past year, giving the company a market capitalization close to €5 billion.
The new Quick Hit number is therefore €2.65 billion. That is the combined value of two IPTO awards won within roughly six weeks, and it could represent nearly half of Cenergy Holdings’ enlarged backlog and more than half of Hellenic Cables’ backlog. For shareholders, that creates exceptional multi-year visibility, but it also makes successful execution of Greece’s island-interconnection programme increasingly important to the earnings story through the end of the decade.
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