https://www.bloomberg.com/news/features/2021-03-08/tesla-is-plugging-a-secret-mega-battery-into-the-texas-grid https://www.bloomberg.com/news/features/2021-03-0

https://www.bloomberg.com/news/features/2021-03-08/tesla-is-plugging-a-secret-mega-battery-into-the-texas-grid https://www.bloomberg.com/news/features/2021-03-08/tesla-is-... Not quite what you were asking about but it does deal with the TX grid.