Indian Energy Exchange (IEX)

Ok. Please help me understand two things.

1. Why will the recent changes force Gencos and buyers to use power exchanges?

2. I am seeing this from this angle. If the #1 is right and more volumes come into power exchanges, then it could be also possible that IEX gets more volume in, right?
   Giving a personal example: When I started investing I was confused which broker to choose. I saw many were using Zerodha and it seemed like a good platform with lots of features. So I took Zerodha. And Zerodha doesn’t control the stock prices.
   Can’t this be happening to IEX too? Even though prices would be uniform accross exchanges, won’t new volumes that would be coming, choose IEX, because duh, most volumes are with IEX and they have a wide variety of products and decent platform.
   Where am I going wrong with the above thesis? Did I assume something wrong?