CNMC opens sanctioning proceedings against Lyntia Networks for possible breach of the commitments of the Iberdrola fibre purchase
CNMC starts sanctioning proceedings against Lyntia Networks over information commitments linked to the purchase of rights over Iberdrola's fibre.
The Spanish National Markets and Competition Commission (CNMC) has opened sanctioning proceedings against Lyntia Networks, S. A. U. for a possible breach of the commitments the company undertook when purchasing rights over the dark fibre of Iberdrola, S. A. (transaction VC/1031/19). The CNMC's press release, published on 5 November 2026, recalls that the opening of the proceedings does not prejudge the final outcome of the investigation and that a maximum period of three months now opens for its investigation and resolution.
On 30 July 2019, the CNMC authorised Lyntia Networks to acquire usage rights and contractual positions over fibre optic cable networks and associated elements owned by Iberdrola España, Iberdrola Distribución Eléctrica and Iberdrola Generación, all of them companies of the parent company Iberdrola, S. A.
An authorisation conditioned on commitments
The purchase was authorised in the first phase, but conditioned on Lyntia fulfilling several commitments aimed at preserving competition in the dark fibre sector. Among them, the CNMC lists:
- Sending information to the CNMC whenever required to do so.
- Submitting reports annually, in the first quarter of each calendar year, for the duration of the first and second commitments.
- Sending documentation to the CNMC on unattended requests and on terminated or renewed contracts.
This type of information commitment is the usual mechanism by which the competition authority monitors that a conditionally authorised concentration does not deteriorate the market once consummated. Its breach is not a mere formal defect: it deprives the supervisor of the instrument that allows it to verify that the transaction does not harm competitors or customers.
How a conditionally authorised concentration is monitored
The three information duties imposed on Lyntia illustrate the usual architecture of post-merger vigilance. The submission of information upon request is the reactive tool: it allows the CNMC to ask for specific data when it detects a signal in the market. The annual reports, submitted in the first quarter of each calendar year during the life of the first two commitments, are the periodic tool: they oblige the company to account regularly for its compliance, without waiting for the authority to ask. And the documentation on unattended requests and terminated or renewed contracts is the market-foreclosure indicator: if customers asking for access to the fibre do not obtain it, or if existing contracts are terminated en masse, those documents are the first evidence that the commitments are not preserving competition as expected. That the declaration of breach affects precisely the deadline and the content of those reports explains why the Board saw indications of infringement: without the information, the vigilance itself goes blind.
The breaches declared in July 2026
On 20 July 2026, the CNMC declared the breach of the third commitment, of the fourth and fifth as regards the deadline for submitting reports, and of the fifth in relation to the content of the reports. Following that declaration, the CNMC Board urged the Competition Directorate to open sanctioning proceedings on the grounds that there were indications of infringement as a consequence of the breach, which has led to the proceedings now opened.
The company, for its part, has appealed the 2026 breach resolution before the Audiencia Nacional and the appeal is pending judgment, according to the CNMC's own release. Any sanction arising from the proceedings will add to that litigation, so the case promises judicial development.
Dark fibre and merger control
Dark fibre —fibre optic cable laid but not lit, that is, without the transmission equipment that makes it operational— has become a strategic asset in the Spanish telecommunications market. Network operators, utilities with deployed infrastructure and infrastructure funds have led fibre purchase, sale and lease transactions in recent years that the competition authority examines closely, because control of wholesale infrastructure ultimately determines competition in the retail market. Lyntia's own transaction was a typical case: electricity companies have been laying fibre over their networks for decades, and its sale or lease to wholesale operators has been a fast route to national deployment.
In that context, conditionally authorised transactions are a frequent instrument: the authority does not prohibit the concentration, but requires commitments —third-party access, price caps, separation of activities— that preserve effective competition. The counterpart of that instrument is its enforceability: a conditional authorisation only works if the commitments are fulfilled and if the breach has consequences. Hence the systemic relevance of sanctioning proceedings for alleged breach of commitments.
Why it matters: the regulatory value of commitments
The proceedings are a clear illustration of how merger control with conditions works in practice. When the CNMC authorises a transaction subject to commitments, those commitments become genuine obligations, whose breach can give rise to sanctioning proceedings independent of the substance of the transaction. For advisers on concentration transactions —and for the companies executing them— the lesson is twofold: reporting calendars and documentation on unattended requests or terminated contracts must be integrated into compliance systems from day one, and a declaration of breach can open a sanctioning front even if the transaction was authorised years earlier.
The case also moves in the strategic terrain of dark fibre, essential infrastructure for telecommunications operators, data centres and large corporate customers, where the CNMC maintains close supervision. The authority has just shown the same supervisory diligence in the universal service area, by reporting favourably on the end of Telefónica's designation as obliged operator, and its recent sanctioning activity recalls the growing weight of the competition authority in infrastructure sectors, in line with matters of great economic depth such as the cardboard cartel and its 670 million megaclaim.
Sanctioning proceedings in competition matters
The opening of sanctioning proceedings does not prejudge the outcome: it opens a procedure with a hearing in which the investigated company can submit arguments and evidence. In matters of commitments linked to concentration authorisations, the Competition Defence Act classifies the breach as an infringement and provides for sanctions that can reach relevant percentages of turnover, in addition to the possibility of imposing effective compliance with what was committed. The procedure concludes with a resolution that can be appealed before the Audiencia Nacional.
The pending appeal before the Audiencia Nacional
A relevant fact from the CNMC's own release: Lyntia has appealed the July 2026 resolution that declared the breach before the Audiencia Nacional, and that appeal is pending judgment. The sanctioning proceedings and the contentious appeal thus run in parallel, so the Court's ruling on the declaration of breach may condition the fate of the sanctioning procedure.
A procedure with a deadline
The proceedings will be investigated and resolved within a maximum period of three months. During that time, Lyntia will be able to submit arguments and the final outcome —dismissal or sanction— will depend on the investigation. The CNMC's release underlines the non-prejudging nature of the opening, a standard but legally significant formula: the opening of the proceedings expresses the existence of indications, not a declaration of infringement.
Frequently asked questions
Why has the CNMC opened proceedings against Lyntia Networks?
For a possible breach of the commitments assumed in the 2019 authorisation of the purchase of rights over Iberdrola's dark fibre (VC/1031/19), in particular obligations to submit information and reports.
Which commitments were allegedly breached?
According to the breach declaration of 20 July 2026, the third commitment, the fourth and fifth as regards the reporting deadline, and the fifth in relation to their content.
Does the opening amount to a declaration of infringement?
No. The CNMC recalls that the opening does not prejudge the outcome; a maximum three-month investigation and resolution period opens.
What has Lyntia done against the breach declaration?
It has appealed it before the Audiencia Nacional, and the appeal is pending judgment.
What is dark fibre?
It is deployed fibre optic infrastructure not lit by its owner, which other operators can use to provide their services; its control is key to competition in telecommunications.
Sources
Fuentes
- Source. Accessed 9 November 2026.
The specific data in this article come from the official sources cited.
