Powering the Future: How Raspberry Pi is Engineering Its Path to Net Zero

In an era defined by the urgent necessity of decarbonization, the term "net zero" has transcended corporate jargon to become a fundamental benchmark of operational integrity. Following one of the most volatile summers on record, marked by record-breaking heat and drought, the imperative to move beyond rhetoric has never been more pressing. At Raspberry Pi, the objective is simple but ambitious: to transform its property portfolio into a model of sustainable, high-tech efficiency.

For the team at Pi Towers in Cambridge, the commitment is not merely about offsetting carbon; it is about "walking the walk"—integrating their own engineering philosophy into the very infrastructure that sustains their daily operations. By utilizing their own hardware to monitor and control energy consumption, Raspberry Pi is proving that sustainable transition is not just an environmental goal, but a masterclass in technological ingenuity and fiscal responsibility.

The Strategic Framework: Four Pillars of Sustainability

Since outlining their four-point ambition toward net zero in 2025, Raspberry Pi has embarked on a systematic journey to overhaul its environmental footprint. The strategy focuses on aggressive solar expansion, the electrification of transport, granular energy monitoring, and the total phasing out of natural gas. This transition is underpinned by a "don’t waste" philosophy—prioritizing the retrofitting and optimization of existing systems over the carbon-intensive process of wholesale demolition and replacement.

Solar Energy: From Roof Arrays to Solar Carports

The cornerstone of the site’s energy independence is a robust solar infrastructure. In June 2024, the company activated an 85.5kW solar array, a project that has already yielded 192,000kWh of clean electricity in just 26 months. The financial viability of this initiative has been clear: the project is currently on track to achieve a full return on investment in approximately 2.7 years—a testament to the economic viability of green energy.

However, the company’s vision extends beyond the rooftop. Raspberry Pi is currently in the planning stages of a 219kW solar carport system, developed in collaboration with the landlord’s agents, Stanhope. Once operational, this installation will bring the total site capacity to 304kW. Projections suggest this will cover an impressive 63% of the facility’s peak summer electricity demand.

For the remaining energy needs, Raspberry Pi has partnered with Granular Energy. This partnership ensures that 100% of the site’s external energy procurement is sourced from renewables, providing the transparency and certificate traceability required to validate their Scope 2 emission reductions.

The EV Revolution: Scaling Infrastructure to Meet Demand

The transition to a sustainable campus also requires addressing the "commuter footprint." In August 2024, the company installed 24 Easee EV chargers. Since the introduction of a new salary-sacrifice EV scheme, the adoption rate among staff has surged. When the initiative began, there were only 11 electric vehicles on-site; today, nearly 60 staff members have been issued charging passes.

To keep pace with this rapid uptake, plans for a second bank of 24 chargers are already underway. The company’s goal is to ensure that both staff and visitors can transition to electric transport without the anxiety of limited charging infrastructure, effectively incentivizing the shift to fossil-fuel-free commuting.

Engineering Efficiency: Attacking the Base Load

One of the most significant challenges in modern facility management is the "base load"—the constant, often hidden energy drain of an office building. To tackle this, Raspberry Pi turned to its own product ecosystem. By combining Raspberry Pi 4 and 5 units with open-source Home Assistant software and Emporia clamping technology, the engineering team has achieved total visibility of the building’s energy flow.

Every breaker, as well as the main high-level supplies, has been clamped and digitized. This allows for a granular, real-time "Sankey diagram" of energy consumption, which has already led to significant "quick wins," such as the automated scheduling of lighting circuits and HVAC systems.

The Raspberry Pi Advantage: A Case Study in Cost-Efficiency

Perhaps the most striking example of this DIY ethos is the replacement of the facility’s legacy Building Management System (BMS). The previous system, a 17-year-old proprietary Trend 963 interface, reached its end-of-life in early 2026. A standard like-for-like industrial replacement was quoted at approximately £150,000.

Instead of opting for an expensive, vendor-locked proprietary solution, the engineering team implemented a custom system using Contemporary Controls’ BASview and BASpi—hardware built on the Raspberry Pi platform. The total cost of this implementation was just £7,800. The new system provides weather-compensated heating, CO2-based ventilation control, and direct solar integration, allowing for a level of data-driven optimization that the legacy system could never achieve.

Turning Off the Gas: The Path to Scope 1 Net Zero

On June 25, 2026, Raspberry Pi achieved a major milestone: the total cessation of gas usage at Pi Towers. Two aging Potterton boilers were powered down, marking the beginning of the facility’s first fully gas-free months. Domestic hot water is now managed by a heat pump installed in 2025, which also contributes to the underfloor heating demand.

However, the team remains pragmatic. While the building is currently gas-free during the summer, the approaching winter months will necessitate the reactivation of the boilers. Rather than opting for an immediate, resource-heavy replacement of the entire heating plant, the company is following a phased approach:

1. Heat Recovery: The engineering team identified that the condensers serving the server room were exhausting significant waste heat. By rerouting this heat under the atrium staircase, they are effectively warming the building using energy that was previously vented to the atmosphere.
2. Ventilation Optimization: Upgrades to toilet and shower extractor fans—now controlled by PIR (Passive Infrared) sensors—ensure that energy is only expended when spaces are occupied.
3. AHU Dampers: The installation of Air Handling Unit (AHU) damper controls for each floor has allowed for more precise air delivery, reducing the mechanical strain on both chillers and boilers by approximately 130,000kWh per year.

Future Outlook: The Target for 2027

As Raspberry Pi looks toward 2027, the focus shifts to the final phase of the decarbonization roadmap. The upcoming objectives include the installation of a new AHU DX coil to electrify the heating of fresh air, the implementation of a bypass damper system to recycle treated air, and the ultimate replacement of the boilers with high-efficiency heat pumps.

The scale of this task is significant; the company anticipates needing 150–250kW of heat output to satisfy an annual demand of roughly 300,000kWh. Yet, the momentum is clear. With new, fully electric warehouse facilities and a commitment to ensuring all retail locations, such as the Raspberry Pi Store in the Grand Arcade, operate on all-electric power, the company is demonstrating that a sustainable future is not only possible but increasingly profitable.

By leveraging open-source technology, maintaining a commitment to retrofitting, and fostering a culture of radical transparency in data, Raspberry Pi is setting a benchmark for how modern businesses can align their operations with the realities of a changing climate. As the company marches toward its 2027 net-zero target, the message to the industry is clear: the tools to save the planet are often already in our hands—we just need the will to build with them.