Diamond Annual Review 2025-26

Energy savings Diamond continues with its energy saving programme, realising savings of £3,654,401 for 2025. This brings accumulated total savings to £18,592,374 since conception of the programme in 2009. Figure 4 provides a graphical comparison of energy supplied from the grid (cyan), energy generated by Diamond’s solar panel installations (yellow) and other energy savings measures such as LEDs, light sensors, variable speed drive installations (green). Electricity consumed 0 10 20 30 40 50 60 Solar power Other savings 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 Figure 4: Grid usage vs solar power generation vs miscellaneous other energy saving measures This demonstrates that approximately 5.8% of Diamond’s annual energy consumption is generated through solar power. A further breakdown energy savings from solar power alongside other miscellaneous energy saving measures is depicted in Figure 5. The above cost savings equate to an overall energy saving of 13.9MWh for 2025. Figure 5: Energy saving measures per category for 2025 Reduction in AHU Operational Hours 4.9% Light Sensors/ LED Installation 18.3% Variable Speed Drive Installation 39.0% Solar Panels 17.5% Chiller Efficiencies 7.2% UPS Replacement 2.8% DH Tx re-tapping 0.3% Adiabatic Cooling 1.3% Free Cooling Activation 3.9% Reducing EH AHU Supply Fan speed from 80% to 70% 2.0% Rescheduling P8/P10 demand via load on coils 0.2% Increasing CHWTemp to 9.5 Deg.C 2.6% 37 Buildings and infrastructure 38 Annual review 2025/26 Buildings and infrastructure