GB battery revenues hit record low in May on missed price shape

GB battery revenues fell to a record low in May 2026, per Modo Energy. The firm attributes the underperformance directly to bidding strategies that failed to adapt to a shift in intraday price shape, meaning assets cycled at the wrong hours and left spread on the table. The scale of the miss is significant: it is the worst monthly revenue outcome Modo Energy has recorded for the GB fleet.

The GB data lands alongside a separate Modo Energy analysis of German BESS revenues published 2 June, which also points to a deteriorating stack. Both markets are grappling with the same structural headwind: as solar penetration deepens, the daily price shape becomes more volatile and less predictable, compressing margins for assets running fixed or slow-adapting dispatch strategies.

On the investor side, Recharge News reports that a newly appointed wind CEO has publicly dismissed standalone storage as a 'pure capex play', a framing that reflects growing scepticism about merchant revenue visibility in markets where capture rates are slipping.