Battery energy storage systems earned £63.5k/MW/year in May 2025 - an 11% reduction in revenues from April 2025.

Electricity demand continued to fall, reaching record lows for 2025 in the final week of May. This resulted in 54 hours of negative prices, the most seen in a single month since August 2024, which helped boost battery revenues to over £100k/MW/year over the late May bank holiday weekend.

For subscribers to Modo Energy’s Research, this article will also cover:

• A breakdown of the change in revenues from each service
• How changing wind generation impacted price spreads
• Insights into the impact of record-high dispatch volume on battery revenues
• Changes in Balancing Mechanism dispatch rates and revenues
• A data download from all the charts

Battery revenues reduced by £8k/MW/year in May 2025

In May 2025, battery energy storage systems in Great Britain earned £63.5k/MW/year. This brings the total average for 2025 to £75k/MW/year, 50% higher than the average for 2024.

Battery revenues reduced by £8k/MW/year for the second month in a row, continuing the recent trend of decreasing revenues as we enter the summer.