July 2026 - more cheap intervals and a better daily profile

July delivered a good result for our model battery (2 MW, 4 MWh, RTE 0.86, DoD 100%), optimized on DA + IDC markets. The battery could have generated 84.6 kPLN in revenue.

📊 Key takeaways

• 21.6% higher revenue than in July 2025.
• 8.5% lower revenue than in June 2026.
• 2,729 PLN in average daily revenue.
• Around 899 kPLN in 12-month rolling revenue, an increase from June.

☀️ More cheap quarter hours during renewable generation hours

An interesting insight from DA Fixing I: during 10:00-16:00, the high RES generation window, July 2026 recorded 115 15-minute intervals with prices ≤ 0 PLN/MWh, compared to 36 intervals a year earlier. Strictly negative-price intervals were 78 vs 36.

⚡ A wider spread between PV hours and the evening

But the key factor was the full daily price profile:

• The average price during PV hours fell year-on-year from 264 to 191 PLN/MWh.
• The average evening price (18:00-22:00) increased from 693 to 758 PLN/MWh.
• As a result, the average PV-evening spread increased by around 32% year-on-year.

In the long run, in an efficient market, excess energy may increasingly be managed through RES curtailment below 0 PLN/MWh. This could reduce the number of extremely negative prices, but such periods will still remain very attractive charging opportunities for battery storage.

💬 Tell us what you think

Will August stay close to July's level?

Share your thoughts in the comments on LinkedIn:

July 2026 - more cheap intervals and a better daily profile

#EnergyStorage #FlexPlum #BESS #BatteryRevenue #July2026 #DAIDC #SolarPower #RES #EnergyMarket #NegativePrices #RollingSum #BESSOptimization #BESSPoland #BESSInsights