Electrical Energy storage device to control outflow of surplus power to Grid

[subodhsingh]

Want to control outflow of surplus power to Grid. It has been learnt that there are power storage devices like: Batteries, Ultra capacitors etc. Which can be more suitable, Ultra Capacitors or Batteries?

 

[bacon4life]

The table at

https://en.wikipedia.org/wiki/Supercapacitor#Comparison_with_other_storage_technologies

provides a comparison of storage technologies. Without further details of your specific application, no one can tell you which might be suitable for your application.