Because of the intermittent nature of renewable energy sources such as solar and wind, which typically produce too much power or too little versus customer demand at a particular moment, they are a variable and therefore often unsatisfactory source of energy for the electricity grid.
Soaring energy bills. Millions unable to properly heat their homes. A gaggle of profit-hungry energy giants ripping us off and making billions in profits. A Government unwilling to act to curb their power. It sounds like the plot of a science fiction movie.