Nearly all of our existing power sources are generators which use a heat cycle. This includes our coal, oil, and gas fired utilities, our automobiles, trucks, and trains, and even our nuclear fission utility power plants.

There are no coal plants on the drawing board for Duke, which leaves us with gas, renewables, and nuclear.

We have never succeeded in slowing down our nuclear fusion reactors.

Rocket scientists agree that we have about reached the limit of our ability to travel in space using chemical rockets. To achieve anything near the speed of light we will need a new energy source and a new propellant. Nuclear fission is not an option.

Our present nuclear fusion reactors are classified by the methods used to support the nuclear fusion reaction, which takes place at a temperature much hotter than the surface of the Sun.

Electricity is derived from many non-renewable energy sources like oil, natural gas and coal.