A significant proportion of the income from your investment in a renewable energy system like solar PV comes from the money you save by using the electricity you generate on site. Every unit (kWh) of electricity you generate and use yourself is one that you do not purchase from your electricity supplier. On sites like chicken sheds, dairies and holiday accommodation it is essential that you match your electricity demand profile as closely as possible to your generation profile to maximise your savings on purchased electricity.
Whilst the output from a hydro unit is relatively stable over a 24 hour period, the output from a wind turbine is much more variable from hour to hour. The generation output from a solar PV installation is quite predictable from week to week and subject only to weather variations.