Indian Energy Exchange (IEX)

There are 4 practical ways , renewable energy from Solar from wind can be stored for Grid stability.
1.Traditional Hydro power stations being executed by NHPC/ SJVN by constructing Dams in flowing large rivers, which are either snow fed or rain fed. (disadvantages – long gestation , high capital cost , depends upon Rain, and environment issues – limited scope, can not be built every where )

2.Advanced battery storage system popularly known as ACC, BESS ( Disadv- import content lithium ion battery expensive, requires regular maintenance , recurring expenditure- 10 -15 years life)

3.Pumped Storage Priject popularly known as PSP -easy to built- all that you you need two reservoirs- one at higher elevation and the other at lower level and a set of Pumps and motors. Good life cycle 50, 50 years- no import content (Requires a lot of space , can not be built every where )

4.Green hydrogen as a storage medium – During peak power, solar wind energy can be used to run electrolyser which can convert water to Green hydrogen…during lean power period green hydrogen can be used to produce power by the help of a fuel cell.
This may be ideal , compact , no environment issues ,( disadv- currently expensive …may be in future as technology evolves, capacity would build up and price could could come down)

so currently , only 2,3 are preferred mode and no 3 is becoming more popular for immediate need for next 6-8 year.

There are a lot of stuff available on Green hydrogen thread. One of the post link given below in which you would get all the information that you need. ( also you may please go through JM financial analysis link at the end of the post.
Also please let me know how you want to connect with IEX.