Energy
Energy is the work done. It is power × time.
Electrical energy is power (most commonly stated in watts) times a unit of time, most commonly one hour) (watt-hours). 1,000 watt-hours equals one kilowatt-hour (kWh), which is the average amount of power in watts transferred (or used) for 1 hour divided by 1,000. A MWh is equal to 1,000 kWh or 1,000,000 watt-hours. All other metric prefixes can also be applied, e.g., giga (billion), tera (trillion), and peta (quadrillion).
For comparison or inclusion with other forms of energy. electrical energy can also be measured in joules (J), British thermal units (BTUs), and million tonne oil equivalent (mtoe). One petajoule (PJ) = 278 GWh. One quadrillion BTU (quad) = 293 TWh. One mtoe = 11,630 GWh.
The average household electricity use in the USA was about 11,000 kWh (11 MWh) per year in 2015.[1] Residential use represented only 38% of electricity use in the USA in 2016.[2]
The total amount of electricity (including commercial and industrial use as well as residential) used in the USA in 2016 was 3.85 PWh (3.85 trillion kWh).[3] With a population of around 323 million,[4] the per-capita (per-person) electricity consumption in the USA in 2016 was about 12,000 kWh per year.