Electricity generation. The production of electricity in 2013 was 23,322TWh. Sources of electricity were coal and peat 41%, natural gas 22%, hydroelectric 16%, nuclear power 11%, oil 4%, biomass and waste 2% and other sources 4%.
The nine Supreme Court Justices on the Supreme Court of the United States are the final arbiters on whether or not a law passed by the legislative branch is constitutional.
Over the years, various Acts of Congress have altered the number of seats on the Supreme Court, from a low of five to a high of 10. Shortly after the Civil War, the number of seats on the Court was fixed at nine. Today, there is one Chief Justice and eight Associate Justices of the United States Supreme Court. Like all federal judges, justices are appointed by the President and are confirmed by the Senate. They, typically, hold office for life. The salaries of the justices cannot be decreased during their term of office.