Why did Texas not start building out batteries for ancillary services until recently? Did/do they not need as much ancillary services as PJM? Also -- do you know what happened to ancillary service pricing as batteries became cheaper? Did grids become much more stable in practice?
That is beyond my knowledge; I know that PJM specifically set up a market for ancillary services that allowed battery operators to get paid. I assume ERCOT must have set up some sort of similar market, but I don't know the particulars...
