Five days ago, a series of funds managed by Ares Management, a $295 billion alternative investment manager, filed a $313 million lawsuit in the US against Mainstream Renewable Power in relation to a loan it advanced to the Irish-founded energy company.  Now the lender has escalated its battle against Mainstream, appointing receivers over a key financing company within the Mainstream Group.  The US fund has appointed Nicholas O’Dywer and Colm Dolan, two accountants with Grant Thornton, as receivers over Mainstream Renewable Power Mezzanine DAC, a financing vehicle for renewable energy development projects in Chile that is at the centre of…