The 2090s's a decade that'll start on January 1, 2090 and will end on December 31, 2099. It'll be the last decade in the 21st century. Notable predictions and known events 2090 The European Energy Council and Greenpeace believes that the entire world can be powered by renewable energy by 2090. 23 September 2090: Total Solar Eclipse in UK. The next total eclipse visible in the UK follows a track similar to that of 11 August 1999, but shifted slightly further north and occurring very near sunset… (More on 2097)