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This paper presents a methodology for analyzing Key Performance Indicators (KPIs), providing knowledge about the performance and efficiency of energy systems, focusing on the demand side. In the first stage of the methodology, the baseline KPIs are calculated. In the second stage, all KPIs are updated to be compared with the baseline ones. In fact, due to the dynamic nature of players in a smart grid, this methodology plays a crucial role in the performance assessment. Moreover, the proper definition and selection of KPIs is usually a challenging task since KPIs can be applied to evaluate diverse areas within a smart grid. Such areas include building energy efficiency, home communications, and smart metering deployment, just to mention a few. In the proposed methodology, the information obtained from a KPI can be driven to distinct aspects such as efficiency, environment, reliability, power quality, safety, security, or cost reduction. Through a case study from a real implementation of an energy system, we show how to assess energy consumption efficiency, thus improving energy management.<\/jats:p>","DOI":"10.1186\/s42162-021-00140-0","type":"journal-article","created":{"date-parts":[[2021,4,12]],"date-time":"2021-04-12T18:03:03Z","timestamp":1618250583000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":18,"title":["A methodology for energy key performance indicators analysis"],"prefix":"10.1186","volume":"4","author":[{"given":"Pedro","family":"Faria","sequence":"first","affiliation":[]},{"given":"Fernando","family":"Lezama","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4560-9544","authenticated-orcid":false,"given":"Zita","family":"Vale","sequence":"additional","affiliation":[]},{"given":"Mahsa","family":"Khorram","sequence":"additional","affiliation":[]}],"member":"297","published-online":{"date-parts":[[2021,4,12]]},"reference":[{"key":"140_CR1","doi-asserted-by":"publisher","first-page":"799","DOI":"10.1109\/ISGT-LA.2015.7381258","volume-title":"2015 IEEE PES innovative smart grid technologies Latin America (ISGT LATAM)","author":"O Abrishambaf","year":"2015","unstructured":"Abrishambaf O, Gomes L, Faria P, Vale Z (2015) Simulation and control of consumption and generation of hardware resources in microgrid real-time digital simulator. 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