Extinction Rebellion Claims Acid Attack on Microsoft-Linked Amsterdam Data Center

Extinction Rebellion’s Dutch chapter says it weakened the concrete foundation of a hyperscale data center under construction in Amsterdam by dousing it with a corrosive chemical mixture overnight between Wednesday, July 15, and Thursday, July 16, 2026. The action targeted a three-tower campus being built by UK developer Pure Data Centres Group (Pure DC) in the city’s Westpoort district, near Sloterdijk train station. The 78MW campus is fully leased, and Dutch media have widely reported Microsoft as the sole tenant, though neither Pure DC nor Microsoft has confirmed that on the record.

What Activists Say They Did

In a press release published the same day, Extinction Rebellion Netherlands (XR NL) said activists threw water balloons filled with a mixture of hydrogen peroxide, acetic acid, salt, and acrylic paint over the site’s perimeter fence and onto the exposed concrete foundation. According to the group, the acid attacks the concrete, the hydrogen peroxide accelerates corrosion of the steel reinforcement inside it, and the salt speeds up both reactions.

XR NL said the action was timed for nighttime, when no construction workers were on site, and that participants wore safety goggles and masks against the fumes. The group said the chemical mixture was prepared the same day as the action and that using the substances this way carried no additional risk to the activists involved.

Pure DC confirmed to Dutch newspaper NRC that balloons had been thrown at the site, but said the incident had no impact on construction and that it intends to pursue legal action against those responsible. Microsoft, Pure DC, and Extinction Rebellion did not respond to a request for comment from The Register, which reported the attack in English-language coverage on July 16.

Inside the AMS01 Campus

Pure DC, founded around 2013 and owned by investment firm Oaktree Capital Management, announced the Amsterdam project in December 2025 as already “fully leased with power and permits in place,” calling it 2025’s largest standalone hyperscale data center lease in Europe, according to its own press release and trade publication Data Center Dynamics (DCD). Designated AMS01, the campus comprises three 85-meter (279-foot) towers on a 5.6-acre site, each housing 26MW of data halls for 78MW of total capacity, and is designed to hit the Netherlands’ energy efficiency target of a 1.2 power usage effectiveness (PUE) ratio. A private substation delivering 100MVA of power is already built and connected to the local 50kV grid. Pure DC says the project represents an investment of more than €1 billion and will create roughly 80 permanent jobs once complete, alongside more than 1,000 construction-phase roles.

Amsterdam has restricted new hyperscale data centers in recent years, and Pure DC’s own materials describe the city as “one of Europe’s most constrained markets for digital infrastructure.” The Register and XR NL’s press release both describe the campus’s three-tower design as staying under the size threshold that would otherwise classify it as a single hyperscale facility and trigger those stricter siting rules.

The Latest in a Series of Protests at the Site

The chemical attack is not the first action against the AMS01 campus. Dutch outlet Techwerkers, which interviewed XR NL spokesperson Martijn Dekker by phone, reported that a separate campaign called Geef Tegengas held a protest at the same site in June 2026, occupying entrances and machinery and halting construction for much of a day. Extinction Rebellion’s overnight action joined that existing campaign rather than starting a new one.

Dekker told Techwerkers the shift to a direct chemical action reflects how the movement is evolving. “You need to keep looking for what resonates with people,” he said. “What’s effective. To target Microsoft in this way, it’s something that many people can understand.”

Why Activists Targeted the Site

XR NL’s press release ties its opposition to energy and water use rather than a single incident. The group cited NRC reporting that a separate, established Microsoft data center in Middenmeer, Netherlands, consumes more than 1 percent of all electricity used in the country. Dekker told Techwerkers that concern over data center water and power consumption is spreading quickly online amid what he described as an acute water shortage in the Netherlands. XR NL’s press release separately calls data centers like this one unnecessary, arguing that most AI applications are undesirable and citing job displacement and the use of creative work without permission as its reasons.

Speaking to The Register, Dekker cast the protest as part of a broader fight against concentrated corporate power, calling it “a necessary step” toward resisting what he described as the “anti-democratic power” of a small group of the wealthiest.

Part of a Wider Pattern

Extinction Rebellion told NRC it plans similar direct actions against other data center projects. The Amsterdam incident adds a physical dimension to a broader pattern of opposition to hyperscale buildouts: Techwerkers cites a Data Center Watch report finding that at least 75 US data center projects worth a combined $130 billion faced disruption from local opposition in 2026 alone. For operators and developers already navigating power, water, and permitting constraints on hyperscale AI buildouts, the Amsterdam action signals that physical security at active construction sites is becoming a live consideration alongside those better-established pressures.