If you buy stock with unsettled funds and then sell the stock before the cash settles, you've committed a good-faith violation. For example, imagine that on Monday you have nothing in your brokerage account except shares of a specific stock, which you sell that morning for $10,000. The trade will settle on Thursday.
Nuclear energy is one of the most reliable ways to generate electricity. Nuclear power stations can deliver predictable and consistent output for long periods of time. The reliability challenge for nuclear
Renewable energy has to be the best way to produce electricity. The concept is relatively new and is already competing with proven ways of producing power like coal and natural gas. The competition is going to get even fiercer over time as research and improvements to renewable energy will inevitably come.