Any difference looks a lot smaller than the markup I've ended up paying for things like going through an energy co-op instead of straight from the generating company.
[...] We do need to talk about cost but we need to talk about ALL the costs not just the operating costs but all the externalized costs as well.
Not just the costs, but also whether the energy is dispatchable.
Power sources which can be turned on and off at short notice - such as gas and hydro - are economically more valuable than ones which can't - such as coal and nuclear. (Some nuclear plants can be ramped up and down, but the capital costs are so high and the fuel costs so low that it doesn't win you much.)
Any of the above are considerably more valuable than sources which are both non-dispatchable and intermittent, such as wind and solar. (How much more valuable depends on factors such as the shape of the demand curve, and how much of the rest of your capacity is gas and/or hydro. Intermittent sources can work quite well in some locations, others not so much.)