Sonnedix acquires 260MW battery storage portfolio in Tuscania, expanding Italy operations past 1GW
AI-madeSonnedix just picked up a 260MW battery energy storage system portfolio in Tuscania, Italy. The seller was Sphera Energy, and the deal covers two adjacent standalone projects—one at 160 MW/4H and one at 100 MW/4H. With this acquisition, Sonnedix’s total global BESS portfolio lands at roughly 2.8 GW, and its Italian capacity crosses the 1 GW mark.
Deal details and portfolio composition
Both projects sit side by side in Tuscania, a municipality in northern Lazio. No co-located generation — just pure standalone storage. Together, they add 260MW/4H of dispatchable capacity to Sonnedix’s books.
Sphera Energy developed the portfolio before the sale. Financial terms weren’t disclosed.
Storage assets like the Tuscania projects can absorb surplus power and dispatch it during peak periods, easing pressure off the grid when it’s needed most.
A 260MW addition in a single transaction is a meaningful step. It brings Sonnedix’s global BESS portfolio to approximately 2.8 GW, sitting within a broader 11 GW total portfolio—solar, wind, and storage—spread across nine countries. The structure is clean, and the scale is hard to dismiss.
Why Sonnedix is expanding battery storage in Italy
Italy is clearly a priority for Sonnedix right now, and this deal makes that hard to miss. The company describes the country as a core market in its global battery storage and hybridization strategy, and Tuscania is the clearest signal yet of how seriously it’s pursuing that.
Sonnedix only entered battery storage in Italy in 2025. The pace since then has been fast—in March 2026, the company acquired six solar PV plants backed by long-term power purchase agreements, pushing its total Italian capacity past 1 GW. The Tuscania BESS portfolio follows just months later.
Hybridization—pairing storage with existing solar—is central to where the company says its portfolio is heading. Solar generates when the sun’s out; batteries let you store that power and release it when it’s actually needed. That combination improves both grid value and commercial returns.
Giuseppe Marona, Managing Director Italy at Sonnedix, put it directly: “We’ve gone from building a solar base to building a genuinely flexible energy business here in under two years.”
Impact on grid flexibility and energy supply in Italy
Battery storage has a specific, practical job in a grid with high renewable penetration. Solar and wind produce based on weather, not demand. Storage assets like the Tuscania projects can absorb surplus power and dispatch it during peak periods, easing pressure off the grid when it’s needed most.
For Italy, that matters. The country’s energy transition is moving fast, and the grid is absorbing more variable generation every year. Flexible storage is becoming increasingly important to keeping things reliable as that mix shifts.
The Tuscania assets also improve how Sonnedix’s existing Italian solar portfolio performs commercially. When storage and solar work together, the combined asset can respond to price signals in ways that generation-only assets simply can’t. As Marona put it: “Storage changes what we can offer the grid, and it changes how our solar assets perform.”
Sonnedix’s broader portfolio and market context
Step back, and Tuscania fits into a company that’s been growing steadily for nearly two decades. Sonnedix currently operates 4.8 GW of assets, has more than 1 GW under construction, and holds a 5 GW development pipeline — 11 GW in total across nine OECD countries: Chile, France, Germany, Italy, Japan, Poland, Portugal, Spain, and the United Kingdom.
Growth comes through a mix of acquisitions and greenfield development, depending on the market and the opportunity. Battery storage, the company says, is now a central pillar of its global strategy — not a niche add-on.
As power systems absorb more variable renewable generation, the ability to store and dispatch power flexibly becomes a real competitive advantage. CEO Axel Thiemann framed it plainly: “Hybridization and optimization are the direction our whole portfolio is heading.” Italy, with its fast-moving energy transition and Sonnedix’s established solar base, is shaping up to be a leading example of what that looks like on the ground.
The company’s total global BESS portfolio is now 2.8 GW
The Tuscania acquisition adds 260MW/4H of standalone battery storage to Sonnedix’s Italian operations, acquired from Sphera Energy. The two projects — 160MW/4H and 100MW/4H — bring the company’s total global BESS portfolio to approximately 2.8 GW.
This follows Sonnedix’s March 2026 solar acquisition in Italy, which pushed its total Italian capacity past 1 GW. The moves reflect a deliberate playbook: build a solar base, then layer in storage to make it more flexible and commercially competitive.
Sonnedix operates across nine OECD countries with an 11 GW total portfolio. Battery storage is now a stated strategic priority — and Italy, where the company only entered the storage market in 2025, has quickly become one of its most active fronts for that push.
Kelly is an experienced writer with 15 years of experience exploring the big stories that shape our world, from tech breakthroughs and space exploration to climate, energy, and the fascinating quirks of science. She has a talent for turning complex ideas into sharp, memorable insights that stay with readers long after they’ve finished reading.
