Wind, at present, is on the par with dirty coal for cost. Without the downstream costs of coal.
Solar will soon be the cheapest of all, and capable of generation in any part of the nation.
Wave is being worked on right now off of the coast of Oregon, and looks good.
Slow current is a brand new technology, and looks like a real winner.
Horses once made up the baseline of this nations transportation. Somehow, we manage to do without them now.
Coal, has been bad-mouthed by many, but there is no replacement source that comes close: reliable, fairly easy to aquire, can be burned and exhaust treated to reduce harmful pollutants (compared to people switching to burning wood in their own homes), transports readily, and available 24 hours a day.
Wind would take more a lot more space than coal burning plants to produce, roughly, the same amount of electricity. Environmentalists are now driving the costs of these turbines, sueing for wildlife interference.
Wave, is promising, but again it cannot supply the nation (transmission over hundreds and thousands of miles), the most efficient delivery of electric power is "close" to the customer.
Horses are still used for baseline work in some areas. Why replace something that works well, without a compareable replacement?
Nuke, environmentalists and gov regulations change the rules faster than the plant can be built at astronomical costs to the utility.
Wind, solar, hydro, wave all work, but take longer to recoup original costs (the reason to build in the first place), and the environmentalists (sometimes the competition using the environment), are making it harder to construct these plants. Currently, the costs of these types of generation are about the same as the income made, not a good business decision.
Coal, being targeted as heavy polluter: by-products used for roads, drywall, concrete. If done correctly, there is little waste and little pollution. The plants can be built without the enormous safety precautions (rightly so) that run up the expenses of nuke plants.
Our gov is telling us to use less power, at the same time telling us to buy products, many of those are electrical. The gov is not talking about power shortages, it is pretending that there is plenty to go around; that is not the case. As our plants age, it will be harder to meet the demands of the nation's energy requirements. Until we "develope and perfect" the alternative sources for energy, don't you think it would be "wise" to prepare for the next thirty years or so?