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The Spanish infrastructure conglomerate Aldesa, a subsidiary of China Railway Construction Corporation (CRCC), has secured a major turnkey (EPC) contract valued at over €160 million (~US$183 million) to construct a massive hybrid solar facility in Mexico. The utility-scale development covers everything from initial 3D modeling to full deployment, featuring a 420 MWp photovoltaic plant paired with an advanced 150 MW battery energy storage system (BESS). The contract also includes substantial high-voltage interconnection assets, encompassing a new 400 kV transmission route stretching across more than 24 kilometers. Sized identically to the rigid energy efficiency and storage thresholds mandated by the Federal Electricity Commission (CFE), this flagship development establishes Mexico as Aldesa’s primary global growth market and underscores a strategic regional trend toward stabilizing private renewable investments via heavy grid integration.
Aldesa, the Spanish infrastructure group owned by China Railway Construction Corporation (CRCC), has been awarded the construction of a solar park in Mexico with a budget of over€160 million — equivalent to approximately US$183 million. The project covers everything from detailed engineering to commissioning, including a 420MWp photovoltaic plant and a 150MW battery energy storage system.
The installation will be developed under a turnkey scheme, meaning Aldesa will be responsible for the entire process from start to finish, from detailed engineering — plans, 3D models, materials — through to commissioning. The project also includes high-voltage interconnection at 400kV with more than 24km of transmission lines between substations, also of new construction.
The client and location have not been publicly identified in the company’s announcement, but the project’s technical specifications — 420MWp of photovoltaic capacity with 150MW of storage and a new 400kV interconnection — are consistent with the mixed development scheme projects awarded by CFE in June, several of which are located in high-irradiance northern states and carry the same integrated storage mandate embedded across the mixed program’s guidelines.
Aldesa’s Growing Mexico Portfolio
With this award, Aldesa reinforces its position as a builder of renewable installations and expands its portfolio of large-scale energy projects. In Mexico specifically, the company is gaining progressive weight. At the start of 2026, in consortium with local firm Jaguar, it was awarded the construction of auxiliary buildings linked to the new railway section between Querétaro and Irapuato, for an amount of MX$3.28 billion — approximately €160 million.
Mexico already integrates one of the largest installations in Aldesa’s portfolio: El Tuli-Helios, with 375MWp in Mazapil, Zacatecas, and 1,137,600 solar panels. The new 420MWp award exceeds El Tuli-Helios in generation capacity, placing the unnamed July 2026 project at the top of Aldesa’s Mexico renewable portfolio by scale and making the company one of the most active foreign EPC contractors in the country’s current solar buildout cycle.
Aldesa’s renewable energy activity now spans seven markets across two continents — Spain, Portugal, Poland, Mexico, Peru, Colombia, and Chile — with more than 3 GW in its project portfolio. In the Latin American market, the scale of projects takes on special relevance. The Mexican market has absorbed two of Aldesa’s three largest single project awards by value in 2026, confirming the country’s position as the company’s primary international growth market.
The 420MWp-Plus-Storage Profile in Context
The project’s technical profile places it squarely within the top tier of Mexico’s current renewable buildout. The installation includes a 420 MWp photovoltaic plant, a 150 MW BESS, and high-voltage interconnection at 400 kV with more than 24 kilometers of transmission lines between substations.
For comparison, the Terralia hybrid wind complex — the largest single project in AMDEE’s wind industry pipeline projection for the mixed development cycle — is designed at 705 MW with 950 MWh of storage. Aldesa’s solar project at 420 MWp with 150 MW of storage is a direct peer in the utility-scale solar segment, sized consistently with what the mixed development scheme’s technical requirements and grid interconnection capacity can absorb in a single project submission.
The 150 MW BESS component exceeds the minimum 30%-of-generation-capacity for three hours mandated under the mixed development scheme guidelines — at 420 MWp of AC output, the minimum would be approximately 126 MW. The 150 MW storage system therefore provides additional flexibility margin, improving the project’s grid value and potentially its competitive positioning in whatever tendering process produced the award.
The new 400 kV interconnection — with over 24 kilometers of transmission lines between new substations — is the project’s most capital-intensive single component after the solar panels themselves. Its inclusion as part of the EPC scope, rather than a separate CFE-funded transmission project, reflects the arrangement under several mixed development scheme structures where the private partner is responsible for the full interconnection to the existing grid node.

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