Solar energy !
There are so many of these where to begin. All of these may be used in the future or are now in use, solar energy, wind energy, geothermal power, and hydroelectric power.
The Future of Clean Energy - 2012 TV was released on: USA: 9 May 2012
It's a possibility that future aircrafts may run on plasma energy.
Bright colors can absorb more light energy, leading to increased activation of molecules in a chemical reaction. This higher energy input can accelerate the reaction rate by providing the necessary activation energy for the reaction to occur. Bright colors may also increase the efficiency of light absorption and conversion to chemical energy, boosting the reaction rate.
Because it pollutes the earth and may not be much in future.
21 Jump Street - 1987 My Future's So Bright I Gotta Wear Shades 1-4 was released on: USA: 3 May 1987
A battery is not a type of energy. It may CONTAIN chemical energy, if it is loaded.
Radiant energy is the safest energy for people and the environment.
All types of energy may be measured in Joules.
Something which may happen in the future, at present it is only an experimental equipment which absorbs more energy than it produces. The most promising type is the tokamak, which you can look up in Wikipedia.
Mechanical energy, which may originally come from just about any other type of energy. For example, if you push with your muscles, you are converting chemical energy in your body into mechanical energy.
Answer 1Fusion may not always be considered the energy source of the future. Many researchers also look to solar power, wind energy, and more. Answer 2It could be when the researchers succeed to get control over its use.