Texas goes green: How oil country became the renewable energy leader - PBS NewsHour

[progree]

10. I've been in the power supply planning and superintendant of operational planning of an electric utility for many years

THE POWER CAPACITY IS JUST AS IMPORTANT..

From what I've seen looking at Lithium-ion utility scale batteries, the only ones I've seen in articles that give both the power and energy capacities is that they are all (that I've seen) designed to deliver 4 hours at their maximum capacity, or more hours at reduced capacity. Perhaps that's just an industry design standard, but that's all I've seen. One can just as accurately say their cost is proportional to their power rating.

When a power plant trips offline, the amount of MW that can be quickly ramped up is the more important factor to stabilizing the system. Usually we're talking seconds or minutes. That the batteries can deliver 4 hours of this is moot for system disturbances like these. Whereas for long wind/solar droughts, then both are important.