European Battery Revenues in August: Spain Up, Germany Down, Poland Depends Who You Ask

Clean Horizon's August index shows grid battery revenues rising in Spain, France, Italy and Portugal and falling in Germany and the Baltic states. For Poland, two analysts publish opposite signs, because they measure different things.

What Clean Horizon reports

ESS News summarised the monthly analysis on 24 September, comparing August with July. Spanish revenues rose by 1 to 6 per cent, to implied annual levels of about €482,000 to €506,000 per MW for two-hour systems and €657,000 to €689,000 for four-hour systems. France rose 6.1 per cent, Italy's two-hour gross revenue 2.2 per cent and Portugal's 16 per cent.

Germany fell by 1 to 6 per cent depending on duration, as reserve prices dropped. Estonia, Latvia and Lithuania fell by 13 to 17 per cent. Demand for two- and four-hour batteries in Romania fell about 35 per cent, which Clean Horizon attributes to lower spreads and competition from newly commissioned batteries. The article's headline says revenues rose everywhere except the Baltics, which does not match its own figures for Germany, Poland and Romania, so we have followed the numbers.

Poland: two answers

In the same report, Poland's two-hour index is down 8.6 per cent. Modo Energy, in a note dated 4 September, says a modelled four-hour battery in Poland earned about 1.89 million PLN per MW per year in August, up 13 per cent on July, with record day-ahead spreads of about 510 PLN per MWh at the daily peak.

The two are not necessarily in conflict. Clean Horizon's Polish figure is for two-hour systems, and Modo's is for an unconstrained four-hour model, with different revenue stacks. Modo adds that the whole monthly gain came from 3 to 14 August, a spell of low wind, higher demand and heat.

Why households might care

These indices describe wholesale and balancing markets, which grid batteries trade in. A household does not earn those prices. What does carry over is the pattern: wide daily gaps between cheap midday power and expensive evenings are the raw material for dynamic tariffs, which we explain in our guide to earning money with a home battery on a dynamic tariff. Check our Poland and Spain guides for local rules.

Both sources describe potential revenue from models, not money actually paid, and we could not find the full Clean Horizon report to check its method.

Sources

• ESS News: Battery revenues rise everywhere in Europe other than Baltics in August 2026
• Modo Energy: Polish BESS revenues rose to 1.89m PLN/MW/yr in August 2026

Related guides

Keep reading, or check your own numbers:

• Home batteries in Poland
• Home batteries in Spain
• EUPD Research forecasts Europe will install about 57 GWh