Battery sizing in systems for power grid frequency regulation?

[crowned]

Hi! I have been on a renewable energy kick lately, and learned that big batteries can be used to help regulate the frequency of the power grid. But how are they sized!?

If I am connecting a BESS to a power grid to help regulate the frequency, I've seen regulation of say, 25MW of regulation taking 2MW of battery.

But I haven't found any sort of formula or guidelines for the battery size.

Any info much appreciated. All I have been able to find online is academic papers. Thanks!

 

[berkeman]

Can you post some links to the reading you've been doing about this? And this is a practice problem, right? You're not really tasked with designing a 25MW facility and asking this question on the Internet...?