Portugal's 80MW Battery Project: What You Need to Know

Akuo is about to break ground on one of Portugal's most significant battery storage projects to date — and the timing couldn't be more deliberate.

The France-headquartered independent power producer is preparing to build its SantasBAT battery energy storage system in Borba, an 80MW/220MWh project co-located with its existing 181MW Santas solar PV plant. Scheduled for completion in Q2 2027, SantasBAT represents more than a single infrastructure milestone. It's a marker of where Portugal's energy sector is heading — and how quickly the country is moving to get there.

The Project Itself: Size, Specs, and What They Mean

At 80MW and 220MWh, SantasBAT is a 2.75-hour duration system. That number matters more than it might seem. A 2.75-hour battery isn't designed for overnight storage or multi-day grid resilience — it's optimized for peak shifting. In Portugal's context, that means capturing midday solar generation when supply outpaces demand, then releasing it into the evening hours when households and industry draw heavily on the grid.

This is exactly the use case Portugal needs right now, as solar capacity continues to outpace the transmission and flexibility infrastructure required to absorb it. Co-locating the battery with an existing 181MW solar plant isn't just convenient — it's economically and technically smart. Shared grid connection points, reduced balance-of-plant costs, and a single operational footprint make co-located solar-plus-storage projects materially more competitive than standalone BESS deployments.

Akuo has an interesting integration history worth noting. The company has occasionally handled system integration in-house for its battery projects — a relatively unusual move for an IPP — though it hasn't confirmed whether it will take that approach here. The system integrator decision will be one to watch when it's announced, particularly given the recent exit of Powin (which had supplied earlier Portuguese projects before ceasing trading) and the broader consolidation happening across the BESS supply chain.

EU Funding and the Government's Role

SantasBAT secured €15 million from Portugal's allocation under the EU Recovery and Resilience Facility — part of a €100 million package awarded to 500MW of storage projects across the country in spring 2025. Do the math, and that's €200,000 per MW at the portfolio level, with Akuo's project landing at roughly €187,500 per MW. Meaningful support, though not a project-maker on its own at this scale.

The more consequential signal is what comes next. The Portuguese government is actively preparing a new auction specifically targeting large-scale energy storage — a policy response, at least in part, to the Iberian Peninsula blackout that rippled through the region last year. That event served as a hard lesson in grid fragility, and Portugal's response — auctions, grid modernization investment, Recovery and Resilience funding — suggests a government that has moved from awareness to action.

For developers and investors watching this market, that combination of EU capital and sovereign-level auction activity is the clearest possible buying signal. Grant funding reduces project risk at the development stage; auctions create revenue visibility at the operational stage. When both are present simultaneously, project finance becomes substantially easier to structure.

What Co-Location Actually Delivers

There's a tendency to treat "solar-plus-storage" as a marketing term. It isn't — at least not when the integration is done properly.

At the Santas site in Borba, the battery isn't just sitting next to a solar farm. It's functionally embedded in the plant's energy flow. Solar generation that would otherwise be curtailed during midday oversupply periods can be captured and stored, then dispatched during peak demand windows in the early evening. That's direct revenue recovery from energy that would otherwise be wasted.

The Alentejo region, where Borba sits, has strong solar irradiance — among the best in continental Europe. That's exactly the environment where a 2.75-hour battery earns its keep. High generation hours create the surplus; the battery monetizes it. Compared to a standalone storage asset that must buy energy from the market to charge, a co-located system has a structural cost advantage that compounds over the project's lifetime.

Akuo has historically deployed BESS in island environments — Tonga, Martinique, New Caledonia — where grid stability and energy independence are existential priorities rather than economic preferences. Those environments demand reliable, well-integrated systems. Bringing that operational philosophy to a continental European grid-connected project is a logical evolution and arguably positions Akuo to compete seriously in a market where many developers are still working through their first utility-scale storage projects.

Portugal's Renewable Ambitions and the Storage Gap

Portugal's 85% renewable energy target by 2030 is ambitious — but it's not fantasy. The country already runs high on hydro, wind, and increasingly solar. The constraint isn't generation capacity. It's dispatchability.

Renewable energy, by nature, generates when conditions allow rather than when demand dictates. Storage is the mechanism that bridges that gap. Without sufficient battery capacity, Portugal faces a familiar paradox: abundant clean generation that can't always reach consumers when they need it, forcing continued reliance on thermal backup or cross-border imports during stress periods.

The Iberian blackout underscored this vulnerability in the most visible way possible. Grid modernization and storage deployment aren't just decarbonization strategies — they're resilience investments. Portugal's government appears to understand the distinction, which is why the post-blackout auction pipeline and grid investment program are being pursued in parallel rather than sequentially.

The broader project pipeline reinforces this momentum. Over the past 12 months, IPPs including Sonnedix, Hyperion, Voltalia, and NGEN have all moved large-scale Portuguese projects into construction. What was a market characterized by a handful of smaller commissioned systems — mostly 2022-2025 vintage, supplied by integrators like Fluence and the now-defunct Powin — is clearly transitioning into a new phase of scale and sophistication.

Where the Opportunity Sits

For developers, landowners, and capital allocators paying attention to Southern European infrastructure, Portugal is worth examining with fresh eyes.

The convergence of EU recovery funding, sovereign auction activity, aggressive renewable targets, and a growing IPP presence creates the kind of market conditions that reward early positioning. Projects that can demonstrate bankable revenue — through auction contracts, capacity payments, or merchant optimization strategies — will attract project finance at reasonable terms. The risk profile is improving as the regulatory framework matures.

Akuo's SantasBAT project, modest as it may appear against some of the gigawatt-scale pipelines being announced elsewhere in Europe, is significant precisely because of what surrounds it: a supportive funding environment, an operational solar asset to pair with, and a government that has moved from aspiration to auction. When Q2 2027 arrives and SantasBAT comes online, it will be one more data point in a country building the infrastructure foundation its renewable ambitions actually require.

The developers who move now — while land is available, interconnection queues are still manageable, and auction competition hasn't peaked — will look prescient in 2030.

Explore more about the opportunities in the energy storage market at InfraSale Marketplace.

[INTERNAL LINK: EU Recovery and Resilience Facility]

[INTERNAL LINK: Battery Energy Storage Systems]

[INTERNAL LINK: Renewable Energy Targets in Portugal]