In October 2006, [[E.ON UK]] announced plans to build two new 800 megawatt 'supercritical' coal units at the power station (Units 5 and 6) at an estimated cost of £1 billion. In its announcement E.ON stated that the new units "could reduce CO2 emissions by up to 1.8m tonnes a year" compared to the existing plants and that they "will operate at an efficiency of 45% and above, compared to the existing units’ efficiency of around 36%."<ref>E.ON UK, [http://pressreleases.eon-uk.com/blogs/eonukpressreleases/archive/2006/10/11/416.aspx "E.ON UK applies to build new £1bn supercritical coal-fired power units in Kent"], Media Release, October 11, 2006.</ref>
On December 11, 2006 E.ON formally submitted it an application for the project to the Department of Business, Enterprise and Regulatory Reform.<ref>Department of Business, Enterprise and Regulatory Reform, [http://www.berr.gov.uk/energy/markets/consents/applications/page23224.html "Applications Under Consideration"], Department of Business, Enterprise and Regulatory Reform website, accessed July 2008.</ref>
===Carbon capture and storage===