Celtel/ Zain is the number one GSM provider in Madagascar. As the electricity grid is very limited in the country and due to the remote locations of the GSM towers with receivers and transmitters, an off-grid system is required. The factory group installed a wind-diesel hybrid system on two sites on top of a mountain in order to decrease the costs of diesel fuel by 80%. Besides the logistical costs to get the fuel on site has been reduced by installation of the wind turbine.