There is not one green anything that can compete in price against our natural resources. To your 50 yr outlook, instead lets look out 500 yrs, we have enough natural gas and coal to last a thousand yrs. And it cheap. All our electrical plants are fueled by natural gas or coal. We've never had a shortage of electricity. All wind and solar does is make more electricity, it does not save one drop of oil. The only reason we have any green at all is because our government is taking tax payer money to subsidize the building or subsidize the buyer. Without the government dumping billions into green there would be none, why, because it is not competitive. Dumping billion into green is the biggest waste of money ever.
T Boone lost millions on wind, he gave it up and is now preaching natural gas, of which is cheaper than ever, and is in large supply.
Now I am not against green, but making more electricity is not the answer, the real problem is a substitute for oil. That is where some dollars need to go is into research replacing oil. Look at what oil does, it fuels our planes, trucks, heavy equipment, ships, trains, cars etc, the challenge is to replace oil with a substitute. Electricity is not it.