site.btaElectricity System Operator Invests More than BGN 50 Million in Digitalization of Power Grid
                                            
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                The Electricity System Operator (ESO) has invested more than 50 million leva in the digitalization of the power grid, ESO Executive Director Angelin Tsachev said Tuesday, speaking at an ongoing regional conference for renewable energy RE-Source Southeast. 
                                    
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