Source: https://www.niti.gov.in/reports [Line item 6]
PS: NITI is the apex advisory body to the Indian Govt.
NITI's report (2015)* says there are still 300M people without electricity, but that "India’s solar potential is greater han 750 GW and its announced wind potential is 302 GW". A fine demonstration of what foresight, will and technical capability can accomplish.
* https://www.niti.gov.in/sites/default/files/energy/175-GW-Re...
There are other answers than "base load"
But.. the article doesn't say "CNG is better" It just says the worst-case costs in the US, for coal sourced power to charge the batteries.
CNG has much less pollution than those two things, but emits the same amount of CO2 (in concern of global warming).
Countries with local NG supplies, especially developing ones, really should use them.
Coal is bad, polluting, creates health hazards and we need to get rid of it. Petrol and Diesel are not "better" and there are reasons central generation may overall be net beneficial especially given the efficiency of generation, transmission losses and in-engine effects comparing ICE to EV