ERCOT battery buildout: Record-breaking new energy storage (June 2024)

In June 2024, ERCOT experienced its largest-ever monthly increase in new battery energy storage capacity.
649 MW of rated power - with 1,040 MWh of energy capacity - became commercially operational across five sites.
This brings the total rated power of commercially operational BESS to 5.3 GW. Since the beginning of 2023, this figure has grown by 2.7x.
June wasn’t only the largest-ever increase in rated power and energy capacity in ERCOT.
It also saw the commissioning of the largest-ever battery projects - both in terms of rated power and energy capacity.
ENGIE’s Five Wells project became the largest battery by rated power in ERCOT at 221 MW. This surpassed ENGIE’s 206 MW Libra BESS, which came online in April of this year.
Additionally, Plus Power completed two projects that now share the record for the largest energy capacity of any battery in ERCOT: Ebony, located just north of San Antonio, and Anemoi, near McAllen in the Rio Grande Valley.
Both are ~2-hour systems with 400 MWh energy capacities.
Elsewhere, Hunt Energy Network continued to add to its network of one-hour, 9.9 MW resources.
In June, Farmersville West 1 and Mainland became commercially operational. This brings Hunt’s total number of battery energy storage systems in commercial operations up to 24.
As total rated power grew to 5.3 GW in June, total energy capacity hit 7.1 GWh.
This brings the average duration of battery energy storage systems in ERCOT to 1.34 hours.
And batteries are getting bigger in general.
In April 2024, the first 200+ MW battery in ERCOT reached commercial operations. In June, three more new batteries (mentioned above) crossed that same threshold.
The average size of battery energy storage systems in ERCOT now stands at 42 MW. This represents a 31% increase from the 32 MW average from exactly twelve months ago.
Battery energy storage systems larger than 200+ MW currently account for 15% of total rated power today.
But, by the end of 2025, we expect this proportion to rise to 40%.
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