► NATURAL RESOURCESsomething such as oil, coal, or the sun, which can be used to provide power for light, heat, machines, etc.: alternative/renewable energy source »
We are committed to the development of clean and renewable energy sources.
the direct source of all the fuels and other forms of energy that we use e.g. coal, oil, wind, tidal. With the exception of geothermal energy and nuclear energy, all of these have originated at some point in time from the sun.