Metered exports for grid-scale batteries in ERCOT suggest they may be losing their energy capacity faster than expected.
The more a battery’s energy capacity falls, the less energy it is capable of storing - limiting its activity in the wholesale energy market. This reduces the battery’s revenue-generating potential.
Why could batteries be degrading faster than expected? And what can owners and operators learn from these insights?
This analysis uses publicly available data from ERCOT to evaluate the potential impact of degradation on individual grid-scale batteries. The data covers operations from January 2020 to June 2025, for sites that came online before 2024.
Modo Energy subscribers can read the full analysis to learn:
- Which batteries show signs of higher degradation.
- Why these assets may be degrading faster than expected.
- And how asset owners can apply these insights when modelling their own sites.
For any questions on the analysis, reach out to the author at ovais@modoenergy.com.
Note: The contents of this article were edited on 20th November 2025 to include the methodology, and to apply insights from battery degradation results observed in Great Britain.
Why batteries may be losing their capacity faster than expected
Metered exports suggest that batteries may be losing their energy capacity at a rate of 7% every 365 cycles. Our methodology uses energy exports as a heuristic for each battery’s total remaining energy capacity - full details are provided at the bottom of the article.
