CT Engineering has signed a three-year Framework Agreement with Red Eléctrica to support the commissioning and maintenance of protection systems at substations across Spain’s electricity transmission grid. These systems play an essential role in ensuring that substations are properly integrated into the grid before entering operation and throughout their service life. The agreement began in October and strengthens CT Engineering’s presence in one of the key infrastructures driving the transformation of Spain’s electricity system.
CT Engineering will carry out the tests, inspections and verifications required to ensure that protection systems respond correctly to potential incidents. These systems identify the affected component and enable it to be isolated quickly and selectively, preventing the incident from spreading to the rest of the installation. The agreement also includes maintenance work on protection systems already in operation.
The collaboration comes at a time of transformation and expansion for Spain’s electricity grid, driven by the decarbonization of the economy and the growing electrification of industry and transportation. This new landscape requires the country’s electricity infrastructure to be strengthened and adapted to changing generation and consumption patterns.
The growth of renewable energy generation and energy storage is taking place alongside rising electricity demand driven by the electrification of industry and transportation, the development of data centers and the integration of new infrastructure. Figures published by Red Eléctrica in February 2026 illustrate the scale of this transformation: the transmission grid currently has access and connection permits covering 76.7 GW of wind, solar photovoltaic and hybrid generation capacity, with an additional 72 GW already holding permits but not yet operational. Furthermore, permits have been granted for 18.52 GW of new electricity demand, of which 11 GW correspond to facilities that have not yet entered service, meaning they have not yet been connected to the transmission grid.
Safety and Reliability: Key Priorities for Substation Operations
Before a substation can be integrated into the grid, its equipment and systems must be tested to ensure they operate correctly and that their various functions work together as intended. Protection systems play a critical role in this process.
“Protection systems are among the most critical components of a substation. Their purpose is to detect abnormal conditions, identify the affected component and act quickly and selectively to isolate it, preventing an incident from spreading to the rest of the installation. That is why, before energizing a substation, it is not enough to check that the equipment has been installed: we must verify that the protection systems respond exactly as they should,” explains Asier Gutiérrez, Business Unit Manager of Electrical Engineering at CT Engineering.
It is precisely at this stage, which is essential to ensuring the safety and reliability of an installation before it enters operation, that CT Engineering will carry out the commissioning activities covered by the agreement.
Specialized Work on Protection Systems
CT Engineering will perform the tests and inspections required to verify the proper operation of protection systems at substations across the transmission grid.
The planned activities include de-energized tests and inspections of the circuits associated with the protection systems, checking configurations, signals, logic functions and trip commands. These tests will validate the performance of the different protection functions and ensure proper communication between devices before the installations enter operation.
The agreement also includes maintenance activities on existing protection systems, aimed at verifying their operation and maintaining their performance throughout the service life of the installations.
These activities require a high level of specialization in electrical protection, testing and commissioning, as well as experience with the systems involved in substation operations. These capabilities are an integral part of CT Engineering’s business, and the company will bring its expertise to the collaboration over the next three years.
Preparing the Grid for the New Challenges of the Electricity System
Strengthening the transmission grid will be one of the key factors in supporting the transformation of Spain’s energy system. Through this Framework Agreement, CT Engineering will work alongside Red Eléctrica in this process, contributing to the commissioning and maintenance of systems that are essential to substation operations.
Over the next three years, the company will contribute its electrical engineering expertise and experience to help ensure that these facilities can be integrated into the grid and operate with the required performance and reliability guarantees.