Construction has officially started on a $650 million Tesla Megapack battery energy storage facility in Belgium — a 2.8 GWh project large enough to power roughly 385,000 homes and one of the biggest battery parks ever proposed for Europe. The site, known as the Green Turtle project, is being built in Dilsen-Stokkem, in the country's Limburg province, and will serve as one of the first deployments of Tesla's next-generation Megablock architecture paired with Megapack version 3.
The scale, the technology, and the location together make this one of the most significant Tesla Energy announcements of the year. It signals that Tesla's utility-scale battery business is now landing anchor projects in Western Europe at a pace that rivals its US pipeline — and it puts the newest Megapack hardware into the field on a project big enough to matter to the grid.
What was announced
According to the source reporting, construction has commenced on a Tesla Megapack facility in Belgium representing $650 million in investment. The headline specs, as shared by @SawyerMerritt citing project documentation:
- Total energy storage: 2.8 GWh
- Homes served (peak discharge equivalent): approximately 385,000
- Investment: $650 million
- Technology: Tesla Megablock with Megapack version 3
- Location: Dilsen-Stokkem, Limburg, Belgium
- Project name: Green Turtle
Background reporting on the project identifies the site as one of the largest battery parks in Europe once complete. The Belgian grid — like most of Western Europe's — is dealing with rising renewable penetration, tighter interconnection constraints, and the phase-out of legacy thermal capacity. A 2.8 GWh facility of this class is designed to time-shift renewable output, provide frequency regulation, and offer capacity during peak demand windows.
Key figures
| Metric | Value | Context |
|---|---|---|
| Storage capacity | 2.8 GWh | Among the largest in Europe |
| Investment | $650 million | Roughly $232/kWh installed |
| Homes powered | ~385,000 | At peak discharge equivalent |
| Technology | Megablock + Megapack v3 | Tesla's newest utility-scale architecture |
Why Megablock and Megapack v3 matter
Megablock is Tesla's next-generation approach to utility-scale storage, moving beyond the individual Megapack unit toward a prefabricated, higher-density building block designed to shorten installation time and reduce balance-of-system cost. Megapack v3, the underlying cell-and-inverter platform, is the successor to the 3.9 MWh Megapack 2 XL that has become Tesla's workhorse product on projects from California to Australia.
The choice to deploy this newer architecture on Green Turtle — rather than the widely proven 2 XL — is notable. Utility-scale customers typically prefer field-proven hardware for projects at this dollar value. Landing a 2.8 GWh anchor deployment for Megablock in Belgium suggests Tesla is confident enough in the platform to commit it to one of its largest European projects.
How this fits Tesla's European energy strategy
Tesla Energy has been growing faster than the automotive side of the business on a percentage basis, and Europe has been an increasingly visible market for Megapack. Grid operators in Germany, the UK, the Netherlands, and now Belgium have been signing larger multi-hundred-MWh contracts as renewable capacity outpaces the transmission and storage infrastructure needed to absorb it.
A 2.8 GWh site in Limburg does more than serve the immediate Belgian grid. Dilsen-Stokkem sits close to the Dutch and German borders, in a region tightly integrated with the wider Central Western European power market. Storage at this scale in this location can participate in cross-border balancing services, which is where the higher-value revenue streams increasingly live.
What to watch next
- Commissioning timeline: Projects of this size typically take 18 to 30 months from groundbreaking to full commercial operation. Any commissioning date disclosed by Tesla or the project developer will indicate how quickly Megablock can be deployed at scale.
- Megapack Shanghai supply: Tesla's Shanghai Megapack factory came online to serve international markets. Whether Green Turtle's units are supplied from Shanghai or from Lathrop, California, will hint at Tesla's global manufacturing balance.
- Follow-on European contracts: If Megablock performs as advertised at Green Turtle, expect additional multi-GWh announcements in the UK, Germany, and Spain over the next 12 months.
- Grid services revenue disclosure: Tesla's quarterly reports increasingly break out Energy Generation and Storage as a distinct line. A project of this scale entering commercial operation will move the needle.
The bigger picture
For Tesla, Megapack is no longer a side business. The company has been scaling storage deployments quarter over quarter, and projects like Green Turtle demonstrate that utility customers are willing to write nine-figure checks for Tesla-branded battery hardware even as the competitive landscape in stationary storage grows more crowded. Landing a Megablock deployment of this size in Europe — with the newest hardware, in a strategically located grid node — is exactly the kind of anchor project that establishes a product platform.
Groundbreaking is only the first milestone. The real proof point will be commissioning, and whether Megablock delivers the installation-speed and cost-per-kWh improvements that Tesla has been signaling for the next generation of its storage business.
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Sources & reporting notes
The links below identify the material source records used for this report.
- @SawyerMerritt on X (2026-09-18T13:26:20.000Z) — Direct source
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