Belgium’s Largest Battery Park Gets Green Light: A €700M Energy Milestone
Belgium has taken a major step forward in its energy transition. The final green light and full financing have been secured for the country’s largest-ever battery park — a €700 million project in Dilsen-Stokkem that will store enough electricity to power roughly 385,000 households at peak demand. Developed by Dutch company Giga Storage, the “Green Turtle” battery park will feature 640 Tesla Megapack 3 batteries with a capacity of 700 MW and storage capacity of 2,800 MWh, comparable to the output of a small nuclear reactor. Construction is set to begin in September 2026, with operational readiness targeted for 2028 and full commissioning by 2029, as VRT NWS reported.
A Strategic Location for Grid-Scale Storage
The battery park will rise on a 12-hectare site in the Rotem industrial estate — the former location of a zinc factory, turning contaminated brownfield land into clean energy infrastructure. Its location is no accident: the site sits adjacent to a future 380kV high-voltage station operated by Elia, Belgium’s grid operator, allowing a direct connection to the backbone of the country’s electricity grid.
Giga Storage has secured €450 million in financing from a banking consortium including Belfius and Triodos, with the remainder covered by shareholders. The project has also received the STEP (Strategic Technologies for Europe Platform) label from the European Commission, recognizing its strategic importance for continental energy security, and has been included in the TYNDP 2026 system study, according to the Giga Storage project page.
More Than Three Times Larger Than Its Predecessor
To appreciate the scale of Green Turtle, consider this: it is more than three times larger than Engie’s battery park in Vilvoorde, which was previously Belgium’s largest at 200 MW and 800 MWh. The 640 Tesla Megapack 3 batteries will be deployed using Tesla’s latest Megablock technology, with the company handling full EPC (engineering, procurement, and construction), battery supply, commissioning, and long-term maintenance under a Letter of Intent signed at the Intersolar Europe conference in Munich in June 2026.
As Giga Storage and Tesla announced in their joint press release, Kevin Dijkers, CEO of Giga Storage, called the project “a milestone for GIGA Storage and for the continued development of large-scale energy storage across Europe,” adding that the partnership with Tesla “reflects our ambition to deliver projects of European significance.”
Mike Snyder, VP of Tesla Energy & Charging, emphasized that “Green Turtle will provide critical stability and energy security for Europe’s evolving grid.”
Why This Matters: Taming Energy Price Volatility
The timing of the announcement is particularly relevant. During a recent heatwave, Belgian electricity prices spiked above €1,000 per megawatt-hour in the evening as air conditioning demand surged while solar generation dropped. Large-scale battery storage is designed to address precisely this kind of volatility by storing excess daytime solar energy and releasing it during peak evening hours.
Joeri Siborgs, Director of Project Development at Giga Storage, explained the logic: “Energy storage on this scale makes it possible to utilize more green electricity precisely at the moments it is needed. That relieves pressure on energy prices and keeps the system affordable.”
However, even Belgium’s largest battery park comes with caveats. As the VRT NWS article notes, the electricity market is international in nature, and no single battery park — however large — can fully prevent price shocks driven by global energy markets. Engie’s CEO has also noted that batteries cannot supply power for weeks at a time during periods of low sun and wind, meaning gas-fired plants remain necessary for long-duration backup.
A Template for Europe’s Energy Storage Future
Green Turtle is part of a broader push by Giga Storage, which aims to have at least 2 GW of operational storage capacity by 2030, with an ambition of 3 GW in Belgium alone. The company is also developing the “Blue Marlin” battery park in nearby Kinrooi, though that project faced local opposition from farmers and required plan revisions announced in March 2026.
The project’s European recognition — the STEP label and inclusion in the TYNDP 2026 system study — suggests it may serve as a template for similar large-scale battery deployments across the continent. With standardized Megablock technology from Tesla and growing confidence from mainstream banks, the model appears increasingly replicable.
What to Watch For
Several questions remain as the project moves forward. Can the 2028 operational target be met amid potential supply chain constraints? How will the Kinrooi project navigate local opposition? And perhaps most importantly, what measurable impact will Green Turtle have on Belgian electricity prices once fully operational?
For now, the project represents a significant vote of confidence in battery storage as a cornerstone of Europe’s energy transition — and a clear signal that grid-scale storage is moving from niche to mainstream.