• Net energy is the amount of useable energy available from a resource after subtracting the energy needed to make the energy from that resource available.
  • The energy cost of an energy resource increases when the easy deposits of that resource have already been consumed.
  • Solar energy yields much more net energy than other sources because it takes very little energy to get usable solar energy.
  • The efficiency of coal-fired electricity is greater in areas where the coal is locally mined and does not have to be transported great distances.
  • Energy efficiency describes how much useful work is extracted from one unit of energy.
Select from the frequently asked questions below