By bne IntelliNews The Kazakh authorities warned on November 28 that Astana could nationalise struggling energy firms following a blackout caused by an accident at a power plant in northern Kazakhstan that left thousands without electricity amid freezing temperatures in the city of Ekibastuz. ‘President Kassym-Jomart Tokayev has instructed Prime Minister Alikhan Smailov to study the issue of nationalising problematic energy assets,’ presidential spokesman Ruslan Zheldibay said on Facebook. ‘Their mismanagement causes accidents and breakdowns in the supply of electricity,’ he added. However, it…