If they do not do a second mid life refit on the last three Kilos that do not have it, by around 2028 PN will have parity or near parity with India on conventional Subs. 3 A90Bs + 8 Hangor V 6 Scorpenes + 4 Type 209s+ 3 Kilos. Whats more none of these have AIP, and the Type 209s are now almost 40 years old. 7 of India's subs will be amongst the oldest in service anywhere in the world.
The last three are recently upgraded or going to upgrade:
L&T was chosen by the Russian shipbuilder Sevmash to be its Indian partner in the refit project. While the first of the four Kilo class subs will go to the Russian Zvezdochka shipyard for inspection and refit, the remaining three are likely to be modernized at the Kattupalli shipyard. The first of the submarines to be modernized at private yard, a first for India, will go in by 2017, An order for 2-3 more submarines could also be commissioned, depending on ongoing acquisition plans of the Indian Navy.
7 kilos are not going anytime soon.
So it will be 7 Kilos + 6 Scorpences + 4 Type 209 submarines = Total 17 submaries
Due to china, the focus has shifted from conventional to nuclear Submarines
Before 2030, India will have active minimum 3 arihant class SSBM (2 + 1 improved version), 1 Akula class from Russia.
And, 1 SSN submarine (In trial or active)
Indian Navy’s Nuclear-Powered Attack Submarine Project Before CCS For Approval, To Be Prioritised Over Second Indigenous Aircraft Carrier
Six SSNs, each displacing 6,000 tonnes, will be built under this programme.