Sizewell B is owned and run by the ailing company British Energy, which recently recieved £650million of taxpayers money to precvent the company collapsing. According to Greenpeace, this money could have been used to build offshore wind farms sufficient to provide 15% of the UK's electricity requirements. British Energy currently provides around 20%.

During a similar protest last October, 150 Greenpeace volunteers invaded the site with only token resistence from a few private security guards and workers. The occupation ended after 30 hours due to the failure of radiation monitoring equipment used by the activists to ensure safety. During the occupation, activists painted "72% Say No" in large letters on the outside of one building. The slogan referred to the results of a Mori poll on nuclear power.

Greenpeace claims that these protests demonstrate what an easy target a nuclear power station would be for terrorists. Rob Gueterbock, speaking from the reactor dome at todays protest claimed that "Sizewell is easier to get into than a Norwich night-club.". At the time of the last protest, Greenpeace claimed that all nuclear power stations could be closed in time for the next general election, and that the UK's energy needs could be met easily and economically by safe, clean alternatives such as offshore wind farms.

Nuclear power generations creates highly dangerous materials, many of which will still be dangerous in thousands of years time. The British nuclear industry currently has cleanup liabilities estimated at £50billion, all of which will be paid by the taxpayer.