ERCOT Storage Performance | June 2026

June was a lighter month for ERCOT storage revenue. The median asset’s revenue fell 34% compared to May, while the median performer saw a much smaller drop of 8%. That gap points to a smaller opportunity to capture in June than May.

In terms of what opportunity did exist, Real-Time (RT) Energy made up the majority of revenue across the fleet, in line with the price premium it held over Day-Ahead (DA) Energy in most hours of the month. DA Energy only won the premium in a couple of hours. With that dynamic, a DA Energy position wasn’t worth the risk it carries for most, so the majority of operators stayed in RT instead. The few who took DA Energy positions largely saw negative or low returns.

The fleet’s highest earning asset generated nearly 1.5x the revenue of the second highest earner, and 5x that of the median asset. Similar to the rest of the fleet, it made almost all of its revenue in RT Energy. While it may seem as though this revenue win indicates strong RT execution, the asset only captured 48% of its RT TBx, which tells us that the battery benefitted from a volatile node, helping bolster revenue outcomes. 

Across the fleet, RT Energy was the majority revenue driver, which tracks with a month where RT held the price premium in 75% of hours.

• Highest earning asset made $4.01/kW, while the top 50 revenue generators averaged $1.86/kW
• Median asset brought in $0.80/kW, with the fleet average higher at $0.90/kW
• RT Energy made up the majority of revenue at 72%

The top performing asset captured roughly 3x the DA TBx of the median asset, again driven largely by its RT Energy performance. That RT-heavy pattern held across the top five performers too. All made the majority of revenue in RT Energy, and also picked up a share of revenue (17%) from RT Ancillary Services (AS), not too far off the fleet’s 22% average, driven mainly by RT Non-Spin. Interestingly, DA Non-Spin prices actually held the premium during most hours of the month, yet DA AS still took a back seat to RT AS overall.

• Top performing asset captured 178% of its DA TBx opportunity, and the top 50 averaged 97%.
• Median asset captured 59%, with the fleet average slightly lower at 56%.

*Top earners defined as highest $/kW

**Top performers defined as highest percent of DA TBx captured – how much of the available Day-Ahead opportunity an asset captured at its duration (‘x’) and node.