Intermittency
From WikiClimate
Intermittency is a term used to identify that many renewables are only available for part of the time and not on demand. For example, solar electricity can only be produced during daylight hours, and the output is much higher on sunny days than on overcast ones. Wind is also intermittent, although at a national level it is rare for an entire country to be wind-free (as might occur if under a large anticyclone).
There are several ways of overcoming intermittency, including storage (eg in batteries, or in hydro-electric pumped storage schemes), backup supplies of other energy sources (including biofuels and fossil fuels) and better demand management (DSM).
See also
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