Microsoft to invest $10b in AI data center in Portugal

Microsoft will invest US$10 billion in an AI data center park in Sines, Portugal, alongside Portuguese developer Start Campus and UK-based startup Nscale.

The project, about 150 kilometers south of Lisbon, is among Microsoft’s largest European investments this year.

A Microsoft spokesperson confirmed the investment but did not provide further details.

Start Campus said the funding aligns with ongoing talks for the next phase of development, after the opening of the first of six planned buildings in March.

🔗 Source: Bloomberg

🧠 Food for thought

Implications, context, and why it matters.

Microsoft’s commitment leaves crucial power timeline and capacity uncertain

Microsoft pledged $10 billion for Sines, though timing for AI-ready capacity remains unclear. Start Campus obtained 1.2 gigawatts from REN 1. SIN01 opened April 4, 2025 at 14 megawatts rising to 26 2 3. SIN02 at 180 starts later in 2025 2, with the full site not expected before 2030 4.
AI work pulls heavy power. GPU servers use far more electricity than CPU boxes 1. The phased plan could keep live capacity thin for years, so Microsoft may lean on CoreWeave mentioned in the announcement or slow its European rollout.

Subsea cable operators can capitalize on Sines as a growing Atlantic interconnection hub

EllaLink links Europe with Brazil at 100 plus terabits per second with about 50 milliseconds latency 5 6, and multiple HDD bore pipes at the beach prepare for more landings 5. The campus offers open facilities (data centers where multiple networks can connect on equal terms) that tie submarine to terrestrial networks 7. Fiber backhaul to Lisbon and Madrid follows gas pipes or power lines 5.
Operators and IXPs should assess new landings at Sines. CDNs and interconnect firms with Latin American, African, or transatlantic needs fit well. Microsoft as an anchor customer (a commitment that helps de-risk builds) pairs with 1.2 gigawatts of nearby compute 1 plus direct submarine links to about 60 countries from Portugal 8. These conditions can create network pull, making Sines a rival to older European sites for low latency paths to Europe and South America.