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.

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ME BESS GB: How record-low demand impacted revenues in May

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