According to the described daily load curve, when is electricity demand typically at its lowest?

According to the described daily load curve, when is electricity demand typically at its lowest?

• A. 12am-7am
• B. 5pm-7pm
• C. 9am-11am
• D. 6pm-9pm

Answer: (A)

The daily load curve shows how electricity demand changes with time of day, and the lowest point occurs when most people are asleep and activity is minimal. That’s late night into the early morning, when homes are quiet and businesses are usually closed. So the window from midnight through the early morning is the trough of demand. The other times fall during periods of waking activity—people are home, heating or cooling may be in use, lights and appliances run longer, and commercial or school activity adds to the load—so those periods sit higher on the curve.

The daily load curve shows how electricity demand changes with time of day, and the lowest point occurs when most people are asleep and activity is minimal. That’s late night into the early morning, when homes are quiet and businesses are usually closed. So the window from midnight through the early morning is the trough of demand.

The other times fall during periods of waking activity—people are home, heating or cooling may be in use, lights and appliances run longer, and commercial or school activity adds to the load—so those periods sit higher on the curve.