The HEDNO (Hellenic Electricity Distribution Network Operator S.A. http://www.deddie.gr/ ) was established in April 2012 with the secession of the Distribution sector of PPC S.?. in accordance with Law 4001/2011 and in compliance with EU Directive 2009/72/EC. It is a 100% subsidiary of PPC S.?., however it is independent functionally and administratively, in compliance with all the requirements of independence incorporated in the above legal framework. HEDNO’s tasks comprise the operation, maintenance and development of the electricity distribution network in Greece in order to ensure transparent and non-discriminatory access of all consumers and more generally of all users of the network. In order to improve service quality as expressed by energy quality indices (number of failures, time of restoration, quality of voltage waveforms, etc.) along with the reduction of the operating cost and the increase of productivity, important investments in the network have been made in order to:

  • Increase network efficiency in order to supply the continuously increasing demand
  • Enhance network reliability and decrease losses by construction of new lines and substations and upgrade of existing ones.
  • Introduce operation automation (installation of remote metering and remote control systems)
  • Construction of networks compatible to societal requirements (taking care of the harmonization of new constructions with the natural and built environment).


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Other relevant information

Publications, and/or products, services

  • Papalexopoulos, I. Vitellas, D. Hatziargyriou, T. Patsaka, A.L. Dimeas, 2011, “Assessment and Economic Analysis of Wind Generation on the Ancillary Services and the Unit Commitment Process for an Isolated System”, Presented in the 16th International Conference on Intelligent System Applications to Power Systems, ISAP 2011, Hersonissos, Greece, September 25-28, 2011
  • Hatziargyriou, S. Papathanasiou, I. Vitellas, S. Makrinikas, A. Dimeas, T. Patsaka, K. Kaousias, A. Gigantidoy, N. Korres, E. Hatzoplaki, 2012, “Energy management in the Greek Islands”, Presented in the 44th International Conference on Large High Voltage Electric Systems, Paris, France, August, 26-31, 2012
  • Mirasgedis, Y. Sarafidis, E. Georgopoulou, D.P. Lalas, M. Moschovits, F. Karagiannis, D. Papakonstantinou, “Models for mid-term electricity demand forecasting incorporating weather influences”, Energy, 31(2-3), 208-227

Relevant previous projects or activities

  • DREAM: Distributed Renewable resources Exploitation in electric grids through Advanced heterarchical Management, FP7, 2013-2016
  • IGREENgrid: integratinG Renewables in the EuropEaN Electricity Grid, FP7, 2013-2015
  • SINGULAR: Smart and Sustainable Insular Electricity Grids Under Large-Scale Renewable Integration, FP7, 2012-2015
  • SMARTKYE: Smart grid KeY nEighbourhood indicator cockpit, FP7, 2012 – 2015
  • SUSTAINABLE: Smart Distribution System OperaTion for MAximizing the INtegration of RenewABLE Generation, FP7, 2013-2015

Significant infrastructure and/or any major items of technical equipment

Basic figures of the Electricity Distribution network:

  • Total length of MV/LV Network of 228.900 km, of which the Medium Voltage (MV). Network is 107.500 km and the Low Voltage (LV) Network is 121.400 km
  • The high-voltage (HV) grid is 949 km, of which 205 km in Attica and 744 km in non-interconnected Islands
  • The network includes 154.950 MV/LV Substations and 224 HV/MV. Substations including 20 GIS substations, 199 in the mainland system and 25 in non-interconnected Islands
  • HEDNO serves 7.503.265 customers (10.147 at MV and 7.493.118 at LV).