Mashhad Electric Energy Distribution Company has designed and implemented its first local micro-grid in Mashhad which is called "Mehrsun". This paper presents the results of field measurement of power quality indices and energy flow for a single customer micro-grid in Mashhad, Iran. Measurements performed during a week in spring for both grid-connected and islanded mode. Power and energy parameters as well as current and voltage THD, voltage fluctuations, power factor are illustrated and their consistency with power quality standards and limits are investigated.