I guess the regulators want the utility companies to handle the delivery of electricity, and other companies to handle the generation (supply) - and sell the supply on the open market to foster competition to benefit the consumer. So now what you got is coal vs natural gas vs oil vs nuclear vs hydro vs "renewables" (i.e., solar, wind, etc...), basically competing against each other. One of the reasons why coal generation is down these days is due to the price of natural gas going down, and coal going up (not to mention the EPA stuff making coal harder to fire). So basically, the cheapest fuel commodity is where most of your power generation is coming from.
As a result, NYSEG sold Somerset to AES, RG&E sold Ginna to Constellation, etc... etc... and the utilities buy from whoever is cheaper - a process that goes on 24/7.
If NYS gets it's act together and allows fracking for natural gas - expect the coal plants to be mothballed indefinitely or decommissioned altogether... and unit coal trains in NY to become more of a rarity... but frack sand trains to increase as they already have in the Southern Tier.
As for Koda... er... Eastman Business Park, their coal plant's days are numbered if they can't find the $40 million to retrofit it to EPA standards soon. As it is, NYS has a 20% surplus in generation right now - even with the coal plants idled... and that's due largely to a number of gas generators coming online, and a decrease in manufacturing that used to gobble lots of power. So if Kodak's goes offline, it won't have that large of an effect on the "grid"... and RG&E has invested a ton in upgrading their delivery system to handle the load from suppliers outside of their service territory.