This is why most BESS's in Europe (and elsewhere) do revenue stacking to be profitable. This means they're not just doing arbitrage of intraday prices, but also

This is why most BESS's in Europe (and elsewhere) do revenue stacking to be profitable. This means they're not just doing arbitrage of intraday prices, but also providing ancillary services to the grid (so if there's e.g. a fault that causes the grid frequency to drop, a BESS will kick in and start to discharge at a power rate that stabilizes the grid frequency).