LFP stationary battery storage appears to be at ~$52/kWh in China [1] (compare to $181 in 2018 per Our World in Data). California buys a lot of stationary storage from Tesla though, which is preparing to start production at the new Sparks, NV LFP cell production facility [2]. Ford is building their own facility in Michigan [3], with 35 GWh of capacity.
[1] https://reneweconomy.com.au/watershed-moment-big-battery-sto...
[2] https://electrek.co/2025/07/01/tesla-unveils-lfp-battery-fac...
[3] https://electrek.co/2025/06/25/ford-stands-by-controversial-...