The air network is exposed and therefore vulnerable to damage due to intense natural phenomena such as snowfall, windstorms, lightning etc. Also in the air network temporary errors or damage due to contact of birds or tree branches with the network occur. Especially in forest areas the fall of trees in elements of the air network can lead to many hours of power interruptions which become even more difficult to manage when accompanied by difficulty or inability of access of technical workshops to repair the damage due to snow etc. The above result in a significant deterioration of the energy quality indicators SAIDI SAIFI The above elements make it attractive to underground the air networks as the underground networks are not affected by extreme weather events and do not affect the human or animal factor from contact with the network. Installed does not require systematic inspection and maintenance Therefore there is no need for scheduling pruning works deforestation or even tree cutting So drastically reduces the cost for the supervision and maintenance of the network Also there will be underground municipal lighting that concerns the Municipality of Penteli and connection of the houses to the new underground electricity network