The second half of California’s plan to build 1000 MW of adiabatic compressed air based long duration energy storage has been announced by supplier Hydrostor, at Pecho Creek, in San Luis Obispo County – a 3,200 MWh facility, rated at 400 MW peak output. This week it filed for an application of certification for the site. Back in April it named its first location in southern Kern County and said that the two investments would cost $1.5 billion and Hydrostor began development work, including transmission interconnection, engineering and permitting. The first installation was said to be around 500 MW peak and both were for 8 hours of duration, so should total some 7,200 MWh of storage when complete. Both are…