B2U's Texas Second-Life Battery Project: Its Website Now Lists 28 MWh

Correction — October 30, 2026: The original September 9 version of this article described B2U Storage Solutions' project webpage as still listing 24 MWh, despite the company's same-day announcement giving Bexar Martinez a capacity of 28 MWh. That 24 MWh webpage figure was recorded in the newsroom's September 9 source check. As checked October 30, B2U's live page instead lists 28 MWh / 10 MW in its history and project sections and identifies 612 repurposed EV batteries. The earlier 24-versus-28 MWh current-page comparison is therefore no longer accurate; the headline, body and source note have been corrected.¹²³

B2U's September 9 release described Bexar Martinez, near San Antonio, Texas, as a 28 MWh energy-storage project built entirely from repurposed electric-vehicle batteries. The company said it had entered commercial operation, was connected within CPS Energy's service territory and would provide grid services to ERCOT. Those are B2U's announcements, not independent confirmation of market operations by ERCOT or CPS Energy.¹

The capacity information at each source check

Source and observation date	Bexar Martinez figure	Other relevant wording
B2U company announcement, September 9, 2026	28 MWh	Said the project had entered commercial operation.1
B2U project webpage as documented by newsroom research on September 9	10 MW / 24 MWh	At that time it described a project using more than 700 EV batteries, with grid services still framed in the future.2
B2U live project/history webpage checked October 30	10 MW / 28 MWh	Identifies 612 repurposed EV batteries; its history says September energization and an October 2026 commercial-operation start.3

The 4 MWh difference between the historically recorded webpage text and the September announcement is a difference between published figures at different observation dates. It does not establish that the installed system physically gained 4 MWh, that a specific number of batteries was removed, or when or why the mutable project page was revised. The current webpage and the original announcement now agree on 28 MWh.¹²³

The company's two commercial-operation descriptions

There is a separate timing distinction. B2U's September 9 release said Bexar Martinez had entered commercial operation; its project/history page as checked October 30 says the site was energized in September and started commercial operations in October 2026.¹³ The reviewed company statements use different timing, but they do not independently establish a precise operational start date or explain the difference. This article does not treat either statement as an independently verified ERCOT commissioning record.

B2U's updated webpage still says the project broke ground in April and received equipment in the first week of June 2026. Its September 9 release called Bexar Martinez the company's second Texas repurposed-EV-battery storage site and said the addition brought its Texas portfolio serving ERCOT to more than 50 MWh. That portfolio figure and the claimed operating milestone remain company-reported.¹³

Sources

Footnotes

1. B2U Begins Commercial Operations of Its Second Repurposed Battery Storage Project in Texas — B2U Storage Solutions / GlobeNewswire, published September 9, 2026. https://www.globenewswire.com/news-release/2026/09/09/3358695/0/en/b2u-begins-commercial-operations-of-its-second-repurposed-battery-storage-project-in-texas.html. Original company-issued announcement reporting 28 MWh, repurposed-EV-battery construction, site location and the assertion that commercial operation had already begun. The announcement does not independently prove ERCOT operating or settlement dates. ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶

2. B2U Our Story / project-history page — historical September 9 observation — B2U Storage Solutions; https://www.b2uco.com/about; inspected and recorded in At The Charger's original September 9, 2026 research packet. At that time the page described Bexar Martinez as 10 MW / 24 MWh, cited more than 700 batteries, and used future-tense grid-service wording. This is a dated observation of a mutable webpage, not a fixed archived copy; the linked page no longer displays those historical values. Do not use it to substantiate any present-tense 24 MWh statement. ↩ ↩² ↩³

3. B2U Our Story / Bexar Martinez project listing — current October 30 observation — B2U Storage Solutions, https://www.b2uco.com/about; directly checked October 30, 2026. The company's live milestone and individual-project sections both list 28 MWh / 10 MW, the project section lists 612 EV batteries, and the milestone states September energization and an October 2026 start of commercial operations. The company has not provided a publication/edit timestamp on this mutable page; this source alone does not independently confirm as-operated capacity, pack inventory or exact grid commencement. ↩ ↩² ↩³ ↩⁴ ↩⁵