Is the radiant energy we get from the Sun. Furthermore This is a clean energy
We can use it to
a) Heat and Cool: that is directly to heat water, or to household heating systems, using solar panels and heat pumps.
b) Generate Electricity : the solar power has to be concentrated or focused. This is because solar radiation reaches the earth’s surface with a density that is adequate for heating but not for an efficient thermodynamic cycle for producing electricity.
There are different types of concentrating solar power (CSP) technologies/systems: