Vilas,
IndiGo use PEP, (version 5.3 if you want specifics!) However, PEP is only as good as the data you enter into it. The surveys that have been (or have not been conducted) at some of the IGO destinations is the problem.
Just look back a few years to the NE when they were departing from certain airports with no obstacle data... The answer given was it wasn't published.
As has been said on here many times before - a simple ICAO obstacle chart is not always enough.
Also, for reasons unknown (cost) IGO won't have the EO procedures coded into the navigation database.
It used to amaze me to see the guys diligently calculating the speeds and FLEX
for an airport where the airline had not conducted a survey! Those numbers then become meaningless!