In December 2009 Eskom notified Exxaro that it wanted to change the terms of the coal supply contract "including the coal price escalation mechanism and the coal delivery ramp-up. Indications are that the date for first coal delivery to the power station, in terms of the CSA, has been confirmed to be during the first half of 2012, aligned to the commercial start-up of the power station." In response to this hiccup, Exxaro put the expansion of the Grootegeluk coal mine on hold.<ref>Exxaro, [http://www.exxaro.com/content/media/newsReleasesNews.asp?Current_ID=260 "Medupi coal supply and off-take agreement update"], Media Release, December 8, 2009.</ref>
According to a 2011 Sierra Club report, Eskom’s own consultants estimate that 35 new coal mines will be required to support Medupi and Kusile.<ref>[http://www.sierraclub.org/coal/narratives/downloads/MoveBeyondCoalNow.pdf "Move Beyond Coal, Now!: Voices from the Front Lines of the Global Struggle"] Sierra Club report, Sep. 2011.</ref>
== Lobbying for Clean Development Mechanism funding==