The floor beneath the batteries

The Same Battery, Twice

In February 2026 a two-hour battery in Great Britain earned the equivalent of £41,000 per megawatt per year. In March the same battery, sitting in the same field and bidding into the same markets, earned £70,000, a jump of sixty-nine percent in thirty days, with not one cell added, not one contract signed, nothing changed but the weather and the price of gas.

Neither number is an outlier. Run the tape back and the GB battery benchmark reads like a seismograph: £77,000 in October 2025, £59,000 in November, £47,000 in December, £52,000 in January, £41,000 in February, £70,000 in March. Eleven months, a low of £41k and a high of £77k, a range of nearly two to one. Across all of it the physical fleet barely moved. This is the defining fact of GB storage economics in 2026, and it is not the fact the headlines report. The headlines report a level, usually a falling one. The reality is a number that will not sit still.