Err... Boi, you're talking about a nation's demand for half a year from a single state.
Recoverable changes with time. India is yet to start shale fracking, so imagine how much will that state alone will hold.
I'm not measuring dick, all I'm saying is $5 billion is not a small amount.
I'm sure the gas reserve of Tripura is more than sufficient for it's own demand and it's economy might also be in a good position compared to its peers.
But what I'm saying is it doesn't have any strategic value for Bangladesh, be it as a source of energy, economic market or geographical location. Heck gas reserves in Sylhet Division alone meets about 60% of Bangladesh's annual demand every year, now you can imagine how bigger it is than Tripura's total reserves which is even less than half of 1 year's demand. Plus, Bangladesh's natural gas potential is still largely untapped with many potential onshore gas fields remaining unexplored. And I'm not even talking about offshore gas reserve which is believed to be one of the largest in the world.