Serbian Prime Minister Vojislav Kostunica pointed out today in talks with delegations of the Lazarevac municipality and the Vreoci community the importance of the Kolubara coal basin for the Serbian power supply system. He underlined that the development plan of surface mines should be in accordance with ecological criteria, and that the competent ministries, Electrical Power Industry of Serbia (EPS) and the Lazarevac municipality should jointly work on this.