Signals and Telecommunication Journal Sašo Brus, Zoran Marinšek 8 1 2019 http://www.dline.info/stj/fulltext/v8n1/stjv8n1_5.pdf In this contribution we describe technical and business case for demand side based virtual power plant for optimization of Microgrid operation. The legal aspect of European harmonized electrical market is described in the introduction section. We describe key players and roles on electrical market.