Raspberry Pi published an update on its net zero work at its Cambridge headquarters. The company installed 85.5kW of rooftop solar, switched to heat pump hot water, and is using its own single-board computers with Home Assistant and Emporia current sensors to monitor every breaker in the building. That setup gives them per-circuit energy data instead of relying on monthly bills or guesswork. The company also replaced a 17 year old proprietary building management system with an open source BACnet setup running on Raspberry Pi hardware. The old system would have cost around 150,000 pounds to replace like for like. The Pi version came in at about 7,800 pounds. It now handles weather compensation, CO2 based ventilation, and solar integration. Future plans include a solar carport that would add 219kW of generation, more than tripling the site's solar capacity. The full post includes more detail on how they classify and control energy use, and where the remaining emissions sit.
