In June 2015, following a series of disputes with his co-investors, Rothschild abandoned his investment in the company, selling his 17.2 percent stake to Coal Energy Ventures.
V júni 2015, po sérii sporov so svojimi spoluinvestormi, Nathaniel Rothschild odišiel zo spoločnosti tým že predal svoj 17,2 % podiel v Coal Energy Ventures.