Tata have recently talked up their share in Mantle's JVA partner Exergen.
Tata/Exergen could build a CHTD plant in India to supply Tata power stations.
However, Indian lignite is very high in ash so they would end up with a high ash BCE(black coal equivalent). Nothing clean about a high ash black coal equivalent.
If they use very low ash brown coal as their source they'll end up with a nice low ash cleaner BCE.
The Aus Gov is currently promoting Adani's Nth Qld project as a low ash black coal alternative for Indian power stations.