​Battery energy storage systems (BESS) in ERCOT are expected to earn $3.97/kW-month in August 2025, a 47% drop from last year. Revenues were still 9% higher than in July, continuing the gradual recovery since the start of 2025.

​The YoY decline was driven mainly by Ancillary Services, which fell $3.6/kW-month. By contrast, more than 70% of revenues now came from Real-Time Energy Arbitrage, with total arbitrage revenues up 4% year-on-year.

Despite the steep fall from 2024, August is expected to deliver the second-highest revenues of 2025.

Subscribers to Modo Energy’s Research can read the full article to explore:

• What drove revenues in August, and how they compare to last year
• Where batteries had the largest revenue opportunities
• What characterized June’s revenue drivers and set leaders apart
• Which 5 optimizers captured more than 80% of their TBX potential revenue in June
• A full data download of all charts

​For any questions on the content in this article, drop a note to alex.dediego@modoenergy.com.

​ERCOT Nowcast | August 2025 - $3.97/kW-month

Most of the drivers for BESS revenues decreased year-on-year, leading to an estimated 47% fall in earnings.