Whos the largest energy consumer?

The U.S. is currently the largest consumer of energy, at current levels of growth, it is possible that in the future China and India could become the leading energy consumer. The U.S. Department of Energy categorizes national energy use in four broad sectors: transportation, residential, commercial, and industrial. Energy usage in the transportation and residential sectors (about half of U.S. energy consumption) is largely controlled by individual domestic consumers.
For example, Home energy consumption averages:
How to reduce home energy usage
space conditioning, 44%
water heating, 13%
lighting, 12%
refrigeration, 8%
home electronics, 6%
laundry appliances, 5%
kitchen appliances, 4%
other uses, 8%
Energy usage in some homes may vary widely from these averages. For example, milder regions such as the southern U.S. and Pacific coast of the USA need far less energy for space conditioning than New York City or Chicago. On the other hand, air conditioning energy use can be quite high in hot-arid regions (Southwest) and hot-humid zones (Southeast) In milder climates such as San Diego, lighting energy may easily consume up to 40% of total energy. Certain appliances such as a hot tub, or pre-1990 refrigerator use significant amounts of electricity. However, recent trends in home entertainment equipment can make a large difference in household energy use. For instance a 50" LCD television (average on-time= 6 hours a day) may draw 300 Watts less than a similarly sized plasma system. In most residences no single appliance dominates, and any conservation efforts must be directed to a number of areas in order to achieve substantial energy savings. However, Ground and Water Source Heat Pump systems are the more energy efficient, there are environmentally clean, and cost-effective space conditioning systems available (Environmental Protection Agency), and can achieve reductions in energy consumptions of up to 70%!

Governmental improvment

Energy is the vital force powering business, manufacturing, and the transportation of goods and services to serve the American and world economies. Energy supply and demand plays an increasingly vital role in our national security and the economic output of our nation. It is not surprising that the United States spends over 500 billion dollars annually on energy. Increasing energy supplies. As America's need for energy grows, the Department of Energy (DOE) is meeting the challenge by establishing clean fuel initiatives to make the most of traditional fossil fuels while investing in cutting edge research to develop sustainable sources such as fusion and to employ hydrogen (an energy carrier like electricity) which can be produced from diverse, domestic sources and greatly reduce our dependence on imported oil.
On September 30Th, 2005, DOE has announced that the federal government has exceeded its goal for obtaining 2.5% of the electricity needed from the renewable energy sources. (This includes such elements as wind, solar, and biomass.) But now, the governments are using 2375 megawatt hours (G.W.H.) of renewable energy. This is more than 10times more that what they use to use. Why? Because now, most federal governments are using energy from biomass, geothermal, solar and wind to perform projects. They use solar panels, on sight wind projects, and thousands of geothermal ground sources of heat pumps that have been installed. They use this equipment to prevent themselves from using up too much energy. These projects help replace those nonrenewable energy sources so that in the future there would be equal amount of renewable and nonrenewable resources left.