After the 2011 nuclear disaster at Japan’s Fukushima Daiichi plant, many people began to protest the use of nuclear sources, however, it continues to be a vital source of energy. Worldwide generation of nuclear energy is expected to grow from around 2.6 billion kilowatt hours in 2008 to about 5.5 billion kilowatt hours in 2040. In 1954, the first nuclear power plant came online in the Russian city of Obninsk. In 2015, there were 441 nuclear power reactors in operation globally. The United States is the largest nuclear power generating country in the world, accounting for almost one third of the world’s nuclear electricity generation. As a consequence, the United States also produces the most nuclear waste globally. The Fluor Corporation is one of the leading nuclear waste contractors in the country. Many of the nuclear reactors in the United States were built by the 1970s with licenses to operate for up to 40 years. The future of nuclear energy depends on many variables, such as cost, and face competition from natural gas and alternative energy sources.
French utility company EDF (Electricité de France) is the world's largest operator of nuclear reactors. With a market value of around 25.6 billion U.S. dollars, the Paris-based firm was ranked among the world’s largest electric utilities as of April 22, 2016.