Southern Europe's Largest Grid Battery Nears Completion in Spain

Southern Europe's Largest Grid Battery Nears Completion in Spain

A landmark energy storage project is entering its final phase in Spain, poised to become the largest Storage as Transmission Asset (SATA) system in southern Europe. Tera Batteries is currently commissioning CATL battery cabinets for a massive 140 MW/105 MWh grid storage project located in the Balearic Islands, specifically across Menorca and Ibiza. This initiative represents a paradigm shift in how island grids manage renewable integration.

Innovative SATA Model and Financing

Developed by the Spanish grid operator Red Eléctrica, the project represents a first-of-its-kind initiative in Spain. Red Eléctrica awarded the battery-supply contract to NHOA Energy in November 2024 following a €99.87 million tender. Construction at the Mercadal substation in Menorca began in February 2025 with a €50 million investment, featuring a 50 MW/37.5 MWh system. Meanwhile, the San Antonio site in Ibiza adds 90 MW/67.5 MWh to strengthen the critical Mallorca-Ibiza transmission link, ensuring reliable power delivery across the archipelago.

Advanced Modular Technology

Unlike traditional large-container setups, the Balearic Islands storage system utilizes CATL modular battery cabinets. Each cabinet features independent liquid cooling, a design choice intended to extend both performance and lifespan in the challenging Mediterranean climate. The Mercadal site uses 176 modules for its capacity, while San Antonio scales up accordingly. Crucially, a shared control system links both sites, allowing them to function seamlessly as a single, unified storage resource for the isolated Balearic grid.

"The project utilizes CATL modular battery cabinets rather than large containers, with independent liquid cooling per cabinet to extend performance and lifespan."

The completion of this project is expected in early 2027. The successful deployment of this SATA model could serve as a blueprint for other island grids across the Mediterranean. By treating storage as a core transmission asset, regulators can more effectively plan for the long-term integration of high shares of renewable energy, ensuring that infrastructure investments are optimized for system-wide benefits.

Source: ESS News

This article was assisted by AI analysis. Please refer to the original source for official information.