It's A Question Of Supply And Demand

If supply = demand, then it is an issue, so as when supply >> demand. Even bigger issue is when supply < demand, even if only slightly.
When supply cannot meet demand, then either reduce demand or increase supply. The better approach, however, is meeting the requirement from both sides of the equation. Increase supply while at the same time reduce demand. Efficiency and energy saving can reduce demand and rate of increase in demand. For that reason, sometimes, energy saving and enhancement in the efficiency of energy usage are seen as energy resources too. Mathematically actually it is just taking the demand variable into the supply side of the equation.