Our 2025 carbon footprint totals 55,570 tCO₂e, with the vast majority sitting within Scope 3, reflecting our focus on procurement and construction activity. But the more significant number is what our assets avoid. An independent assessment of a 99MW UK BESS asset shows net lifetime emissions of approximately -186,690 tCO₂e, with carbon payback achieved within around four years.
Across the ten UK BESS assets Harmony managed in 2025, carbon avoided totalled 36,831 tCO₂e, from 129,106 MWh of renewable energy stored and exported.
The data is clear: a BESS avoids significantly more carbon than it creates, making battery storage one of the most effective tools available for supporting a clean, reliable energy system.
