Linked from
The 8 pages that link to Electricity demand, each with the reason it gives.
Electric arc furnaceRelated: Large furnace loads can affect grid planning and electricity markets.
Heat waveRelated: Air-conditioning use can drive demand to peaks during hot weather.
Load balancingRelated: Demand varies by time and must be matched by available supply.
Energy consumptionBroader topic: Its peaks determine the capacity grids must be able to supply.