Building designers strive to optimize the efficiency of the building while also incorporating renewable energy technologies, aiming towards reaching a zero-energy building. Other efforts such as using energy-efficient appliances or upgrading insulation can also be made in order to reduce energy costs. In terms of energy generation, certain technologies such as combined heat and power (CHP) systems can increase energy efficiency by capturing excess heat to use as a heating or cooling option for nearby buildings. Smart grids are another example that can improve the efficiency of electric generation, distribution, and consumption. Energy efficiency in the transportation sector is also becoming commonplace, where hybrid and electric vehicles require less fuel and have lower emissions to travel the same distance compared to a conventional car.
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In the following 5 chapters, you will quickly find the 27 most important statistics relating to "U.S. energy efficiency".