Anatomical changes. The hominoids are descendants of a common ancestor. Human evolution from its first separation from the last common ancestor of humans and chimpanzees is characterized by a number of morphological, developmental, physiological, and behavioral changes.
The average price people in the U.S. pay for electricity is about 12 cents per kilowatt-hour. (Context: A typical U.S. household uses about 908 kWh a month of electricity.).
An average American home uses 40 kWh per day. Efficient homes use as little as 14 kWh a day, which includes winter heating (electric heat pump). Some off grid homes as little as 1 kWh a day! So, my consumption is right at slightly less than half the average American's and that seems about right considering there's just one person in the household.