<Tr> <Td_colspan="6"> Source: IEA, in 2009, 2010 BP </Td> </Tr> <P> As of 1 July 2016, the world had 444 operable grid - electric nuclear power reactors with 62 others under construction . Since commercial nuclear energy began in the mid 1950s, 2008 was the first year that no new nuclear power plant was connected to the grid, although two were connected in 2009 . </P> <P> Annual generation of nuclear power has been on a slight downward trend since 2007, decreasing 1.8% in 2009 to 2558 TWh, and another 1.6% in 2011 to 2518 TWh, despite increases in production from most countries worldwide, because those increases were more than offset by decreases in Germany and Japan . Nuclear power met 11.7% of the world's electricity demand in 2011 . Source: IEA / OECD </P> <P> Renewable energy is generally defined as energy that comes from resources that are not significantly depleted by their use, such as sunlight, wind, rain, tides, waves and geothermal heat . Renewable energy is gradually replacing conventional fuels in four distinct areas: electricity generation, hot water / space heating, motor fuels, and rural (off - grid) energy services . </P>

What percentage of the world’s energy is derived from nuclear power