At the Intersolar Europe conference in Munich, Dutch energy storage developer GIGA Storage and Tesla signed a letter of intent to build one of the largest battery storage installations on the European continent.

The project, named Green Turtle, will carry a storage capacity of 2,800 MWh and a power output of 700 MW, placing it among the most significant grid-scale battery developments Europe has seen.

Scope of the Agreement

The letter of intent commits both parties to negotiate exclusively on the full delivery of Green Turtle. Under the terms agreed, Tesla takes on a comprehensive role that spans the entire engineering, procurement, and construction scope, as well as battery supply, commissioning and long-term maintenance. Tesla will deploy its latest generation Megablock technology to execute the project.

Kevin Dijkers, CEO of GIGA Storage, described the signing as a milestone for the company and for large-scale energy storage development across Europe. "Our partnership with Tesla reflects our ambition to deliver projects of European significance that contribute to a reliable, affordable and sustainable energy system," Dijkers said.

Mike Snyder, Vice President of Tesla Energy and Charging, said the collaboration would allow Tesla to support the project across construction, hardware, software, and long-term service.

"Providing support across construction, hardware, software, and long-term service allows us to accelerate timelines, reduce project risk, and ensure performance throughout the product lifetime," Snyder said. "Green Turtle will provide critical stability and energy security for Europe's evolving grid." Final contracts are expected to be signed this summer, after which project financing will be concluded.

Location and Grid Connection

Green Turtle will be built on the Rotem industrial site in Dilsen-Stokkem, located in the Belgian province of Limburg. The project will have a dedicated 380 kilovolt connection to the high-voltage grid operated by Elia, Belgium's national transmission system operator. That direct connection to the high-voltage backbone is designed to allow the project to deliver grid stabilisation services at scale.

At its stated capacity, the project would be capable of powering around 385,000 households at peak demand. The developers position it as a critical support mechanism for the continued expansion of solar and wind generation across Belgium and the broader European market, where intermittent renewable sources are placing increasing pressure on grid operators to secure flexible balancing capacity.

European Recognition

Green Turtle has already attracted formal recognition at the European level. The project has been included in the Ten-Year Network Development Plan 2026 system study, known as the TYNDP, which is the framework used to assess the future development of Europe's energy infrastructure.

It has also been awarded the STEP label by the European Commission, a designation that confirms the project's strategic importance to the continent's energy supply.

The inclusion in the TYNDP and the award of the STEP label signal that regulators and planners at the European level regard Green Turtle as a meaningful contributor to continental energy security rather than simply a national infrastructure asset.

GIGA Storage's Broader Portfolio Ambitions

For GIGA Storage, Green Turtle represents a significant step in an expanding European development programme. The company has stated a target of having at least two gigawatts of operational storage capacity in service by 2030. Green Turtle's 700 MW of power capacity alone would represent a substantial portion of that goal.

The project also illustrates the increasing appetite among European energy developers to pursue battery storage at a scale previously associated only with conventional generation assets. A 2,800 MWh installation connects directly to transmission infrastructure rather than distribution networks, reflecting a shift in how grid operators and developers are approaching the role of storage in system planning.

Tesla's Role in Large-Scale European Storage

Tesla's involvement in Green Turtle as a full EPC contractor marks a significant commitment to the European utility-scale storage market. By taking responsibility not only for battery supply but also for engineering, construction, commissioning, and ongoing maintenance, Tesla assumes a broad delivery and performance obligation across the project's lifetime.

The company's Megablock technology, which Tesla will deploy at the Dilsen-Stokkem site, represents its latest generation of utility-scale storage hardware. The announcement did not specify the duration of the long-term maintenance agreement included in the letter of intent.

The signing took place at Intersolar Europe in Munich, one of the solar and energy storage industry's most prominent annual gatherings, giving the announcement considerable visibility across the sector at a moment when European governments and grid operators are actively seeking large-scale flexibility solutions.

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