Here is the reality.
Efficiency is a key component of cost, but the alt-energy proponents love to ignore that factor. They are so in love the the concept of renewable energy that they are willing to overlook the science.
The most criminal example of ignoring efficiency is the federal mandate to put ethanol in our gas, which decreased mileage by at least 3% and as much as 10%. So, instead of getting 20 miles per gallon, you only get between 19.3 and 18. At $2.50 per gallon, it actually costs us as much as another $6.00 to get the same level of efficiency, and that's with 90% fossil fuel helping that weak-ass 10% corn fuel bogging down the engine.
We are at least 50 years away from technology that will make alternative energy as efficient as fossil fuels.
That's why pro-alt-energy people are using government to FORCE it on us. They know it will not be as efficient as fossil fuels and they have FAILED to convince enough people that (1) human activities are causing climate change, and (2) that the consequences of the human affect on climate are so dire that we must abandon fossil fuels completely and immediately (or give up our capitalist economy, which is the real goal).
Sorry, alt-energy lovers. Unless we have some dramatic advancements in energy technology, fossil fuels will be the main source of energy for the remainder of your lifetime.