Why Do So Many Usa Quads, End Up As Rejected Energy?

A Quad is a unit of energy used by the U.S. Department of Energy
. . . in discussing world and national energy budgets.
Some common types of an energy carrier approximately equal 1 Quad are:

• 8,007,000,000 Gallons (US) of gasoline
  
• 293,083,000,000 Kilowatt-hours (kWh)
  
• 36,000,000 Tonnes of coal
  
• 970,434,000,000 Cubic feet of natural gas
  
• 5,996,000,000 UK gallons of diesel oil
  
• 25,200,000 Tonnes of oil
  
• 252,000,000 tonnes of TNT or five times the energy of the Tsar Bomba nuclear test.

In 2011 the USA had:
20.3 Quads out of 35.3 Quads of Petroleum were Rejected Energy
26.6 Quads out of 39.2 Quads of Electricity Generation were Rejected Energy
55.6 Quads out of 97.3 Quads of U.S. Energy in 2011 were Rejected Energy

Source: Rejected Energy