Short answer
Demand usually rises in the morning, peaks in the early evening and changes with weather, daylight, weekday patterns and season. High demand often requires more flexible generation.
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Great Britain covers England, Scotland and Wales; Northern Ireland operates in a separate electricity market.
Demand right now
EnergyMix.info shows live demand alongside generation and interconnector flows so you can see whether the system is tight, quiet, clean or gas-heavy.
Daily demand curve
A typical day has a morning rise, a daytime plateau or dip, and an early evening peak. Solar can reduce grid demand during daylight hours, while winter evenings can be especially demanding.
Peak demand
Peak demand matters because the grid must have enough available generation and imports to meet it. Flexible sources such as gas, storage and interconnectors often become more important at peaks.
Seasonal changes
Demand is usually higher in colder, darker months because of heating, lighting and longer evening peaks. Heatwaves can also change demand through cooling and industrial patterns.
Demand and carbon intensity
Higher demand does not automatically mean higher carbon intensity, but it often increases the chance that fossil generation is needed if low-carbon output is not enough.
FAQs
When is electricity demand highest?
Often during early evening, especially in colder months when people are home and solar output has faded.
Why does demand matter for carbon intensity?
If extra demand is met by gas or other fossil generation, carbon intensity rises.
Can shifting demand help?
Yes. Moving flexible use to cleaner, lower-demand periods can reduce emissions and sometimes cost.
Related pages
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