With ESOS Phase 3’s second progress update due 5 December 2026, and Phase 4 qualification landing the same date, energy managers face a familiar pressure. Every figure submitted is public, and every action plan needs board level sign off. That means the numbers behind it need to hold up.
A UK university large enough to fall within ESOS’s mandatory reporting threshold, its energy estate spread across multiple sites in a market town rather than a single enclosed campus, took that seriously. Across four buildings, each with different loads and equipment ages, the university installed voltage optimisation to reduce consumption, then brought that reduction under continuous monitoring through Pulse, an energy management system, to verify the saving held over time rather than fading after installation.
The results, measured rather than estimated, came to a 6.22 per cent average reduction in energy use across the four sites. That translated to 59,247 kWh saved and 12.27 tonnes of CO2 avoided, figures drawn from live monitoring data, not a one-off projection.
For an energy manager, that distinction matters more than the headline number. ESOS progress updates ask for energy consumption reduction that has been achieved, not anticipated, and SECR reporting draws on the same underlying data. A saving that cannot be verified against real, ongoing consumption figures is a liability at the point someone has to defend it, whether that is the Environment Agency or your own board.
This case also reflects something energy managers raise often, that compliance reporting itself has become a workload problem as much as a technical one. A verified savings figure that maps directly onto ESOS and SECR requirements, updated continuously rather than recalculated by hand each year, removes a step most estates are still doing manually.
Powerhub Solutions is a UK energy efficiency company delivering voltage optimisation, refrigeration energy management, solar PV and Pulse, an energy management system built for ESOS and SECR reporting, across more than 3,000 UK sites.
- Book a free site assessment at powerhub.solutions to see what a verified saving looks like on your estate.
- See how Pulse works at powerhub.solutions/pulse to turn live monitoring data into audit ready reporting.
- Speak to our team on 0161 327 4036 or send an email to enquiries@powerhub.solutions to discuss your next ESOS action plan.
This article appeared in the September 2026 issue of Energy Manager magazine. Subscribe here.
