High-Granularity RAN Energy Intelligence for Virgin Media O2

This technical report outlines the energy measurement and optimisation efforts undertaken by Virgin Media O2 (VMO2) across modernised Radio Access Network (RAN) sites. The objective was to validate real-world energy use, assess efficiency, and identify drivers of high consumption. Key challenges included capturing precise energy measurements, deploying solutions with minimal disruption, and monitoring numerous measurement points. The report details the deployment of VISMON Energy, which provided high-frequency power measurements and integrated temperature-aware monitoring to contextualise energy consumption. The solution enabled VMO2 to benchmark energy efficiency, validate sources of consumption, and identify causes of high energy use. The results indicated a 30% improvement in energy efficiency, with near real-time monitoring across multiple sites. The report also describes the establishment of a repeatable trial blueprint for future energy optimisation programmes, highlighting the importance of accurate energy visibility in supporting sustainable operations and informed decision-making.