By what measure? Coal hasn't been competitive for decades and the only way it had remained competitive in terms of cost per MWh even back then was if you burned it in huge (> 1GW) plants. 1GW plants are the very opposite of what you want to electrify rural areas - construction is slow and expensive, operating large plants requires considerable and qualified head-count, logistics is an issue and they require high capacity and expensive transmission systems.

And if your minimum unit size is 1GW then you lose the flexibility to roll out the tech incrementally - the average modern coal plant requires 3 to 5 weeks per year for scheduled downtime for maintenance - so your first 1GW coal plant requires a bunch of other generation sources to cover demand during these periods.

Solar and batteries are the obvious solution for rural electrification: scaleable, cheaper/simpler to deploy - no large scale civil engineering involved, trivial to "operate", effective without the support of big transmission systems and it's possible to buy everything off-the-shelf.