A month ago, the destabilization of an old generator at the El Palmar thermal power plant in La Gomera caused a dramatic “cascade effect” that left more than 15,000 people without electricity, and without mobile coverage. This incident showed the extreme fragility from living in an isolated electrical system. However, the solution to this historical vulnerability no longer looks to the sky, but to the depths of the Atlantic. To overcome the abrupt volcanic orography and the extreme pressures of the Canary Islands seabed, engineering has had to design an “umbilical cord” unprecedented in the world, marking a before and after in the history of the archipelago.
The end of isolation. In an effort to protect supply, Red Eléctrica de España (REE) has officially inaugurated the underwater interconnection between La Gomera and Tenerife. As confirmed by the REE itselfthe magnitude of the project translates into historic figures: an investment of 145 million euros for the cable laying, to which are added another 32 million destined for the two link substations located in Chío (Tenerife) and El Palmar (La Gomera).
It is not a capricious work. How they collect local mediathe Canary Islands have suffered nine major “energy zeros” (total blackouts) since 2009. Tenerife and La Gomera have been among the islands hardest hit, so this infrastructure was born as a vital antidote to darkness.
More than light. The implementation of this system completely alters the energy paradigm. As indicated ANDldiario.esboth islands cease to be solitary island systems and become a single network. From now on, if the rubber plant fails, Tenerife will inject energy instantly to avoid a blackout, and vice versa.
But the scope of the work transcends mere security. As explained in detail in the REE statementcable is the key to decarbonization. La Gomera will now be able to generate much more renewable energy – mainly wind – than its population consumes. This green surplus will not be lost, but will travel along the seabed to Tenerife, drastically reducing the burning of fossil fuels on both shores.
The technical challenge: engineering to the limit. Connecting two volcanic islands separated by abyssal trenches is not an easy task. As emphasized The Daythe 36 kilometer length of the cable descends to 1,145 meters below sea level. This extreme depth makes it the deepest tripolar alternating current link on the entire planet, snatching the record that linked Crete and the Peloponnese since 2021.
To withstand the weight and crushing pressure of the ocean at these levels, engineering had to reinvent itself. To do this, they had to discard the traditional use of steel and lead, opting instead for an ultralight synthetic material armor and an insulation based on ethylene and propylene rubber.
Caring for the environment was also a priority. In order not to destroy coastal biodiversity or alter shallow volcanic beds, from The Confidential detail that it was used the “directed drilling” technique: an underground microtunnel that allows the cable to exit to the sea hundreds of meters from the beach. Likewise, the terrestrial substations use GIS (gas-insulated) technology to occupy the minimum possible space, and their buildings have been camouflaged imitating greenhouses and agricultural terraces to integrate into the landscape.
Laying underwater bridges. The milestone of La Gomera and Tenerife is just the beginning. Future planning, as pointed out The Daycontemplates the colossal challenge of joining Fuerteventura with Gran Canaria, an even greater challenge given that the distance between the two exceeds 100 kilometers.
Parallel to the electrical revolution, the Canary Islands are experiencing an unprecedented leap in their telecommunications. As these local media detailthere are more projects like BASE 6, promoted by the public company Canalink. This is a new 328 kilometer fiber optic cable with a budget of 19 million euros that will link Tenerife with El Hierro, landing through a drilling on Tamaduste beach. This data highway, with a capacity of 5 terabits per second, seeks to eradicate the digital divide on the most remote island, guaranteeing services such as telemedicine or online education.
The invisible network. The Canary Islands not only look inward. As contextualized by OCTSI (Canary Telecommunications Observatory), the archipelago has been functioning for decades as a global strategic node, surrounded by historic fiber rings and international connections such as Telefónica’s PENCAN cables, currently in the process of renovation.
However, this strategic position has its geopolitical edges. An extensive report from my colleague for Xataka focuses on network extension from Canalink to Africa. The Canary Islands are financing a cable to the Moroccan city of Tarfaya with European funds. The problem lies in the fact that Morocco intends to extend this infrastructure towards Western Sahara, a movement that clashes head-on with the rulings of the EU Court of Justice and that threatens to place Spain at the center of a complex diplomatic and legal conflict with the Polisario Front.
Overcoming geographic isolation. At 1,145 meters under the scrutiny of the waves, where sunlight does not reach and the pressure is unbearable, the heartbeat that unites two islands now runs. The Canary Islands are managing to transform their greatest geographical weakness—fragmentation and isolation—into a true global showcase of technological innovation. Little by little, the old and noisy combustion engines give way to a future that will be inescapably green, and deeply interconnected.
Image | OCTSI
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