The energy used by a 1,000-watt device running for exactly one hour.
A 100-watt light bulb left on for 10 hours equals 1 kWh.
Large industrial users or power plants may use Megawatt-hours (MWh) or Gigawatt-hours (GWh). Natural Gas: Therms or Cubic Feet
Depending on the form of energy you use, your bill will be calculated using different standard measurements.
The price you pay isn't just for the energy itself; it is split into two main components.
The amount of heat needed to raise the temperature of one pound of water by one degree Fahrenheit.