• The concept of energy conservation has never been stronger, as the amount of electricity consumed in U.S. homes fell in 2013 for the third straight year. Usage is at the lowest level since 2001. Several factors are involved, in addition to Americans being more conscious of saving power: homes are better built; appliances and gadgets are more efficient; insulation has become better and cheaper; and there are nifty new devices such as smart thermostats.