February marked a turning point in the French electricity market in early 2026, with negative prices emerging for the first time, intraday volatility peaking and battery energy storage systems (BESS) capturing growing revenue opportunities.
Storio Energy, a B2B battery energy storage company, has published its updated electricity price observatory for February 2026. After a tense January, February showed early late winter dynamics: negative prices, strong intraday spread and the first effects of the 15-minute market interval.
The month had two different periods. The first ten days maintained the winter profile, with low temperatures and supported spot prices. The second half saw a warming trend, lower electricity consumption and a sharp drop in prices. This pushed the monthly average spot price to €46 ($53.40)/MWh, which is unusually moderate for a winter month.
Negative prices appeared as early as February, while in 2025 they only appeared at the end of March. The change reflects the structural evolution in the French electricity mix, with 6 GW of additional PV capacity installed by 2025.
High afternoon solar yields, combined with mild temperatures, occasionally caused overproduction, driving prices to zero or negative levels. 2026 is expected to break records for the frequency and magnitude of such overproduction events, underscoring the value of battery storage for absorbing and monetizing excess energy.
Even with low average spot prices of €46/MWh, morning and evening peaks remained strong, with an average of €108/MWh. The average difference between the minimum and maximum prices was €94/MWh, confirming continued high intraday volatility.
In this context, BESS’s revenues are increasing. Five months after France moved to a 15-minute spot market interval in October 2025, arbitrage revenues have increased by an average of more than 20% compared to the previous hourly market. A finer granularity increases the ability to exploit price differentials, strengthening the short-term storage business model.
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