"Peak demand" refers to the highest level of electricity or energy consumption within a specific period. It is the time when the most amount of energy is needed to meet the demands of consumers. Full definition
A utility could fully charge vehicles when solar is plentiful, for example, and then limit charging during periods of peak demand for electricity. (energynews.us)
Demand response is the commitment of electricity users to curb consumption when necessary during peak demand times. (energynews.us)
During this shift, the buffer between peak demand for power and the maximum that can be generated (the capacity margin) is expected to shrink. (carbonbrief.org)