• Data reference period
• Geographic location (Portugal)

• RESIDENT POPULATION:  Set of persons who, regardless of being present or absent in a given housing unit at the moment of observation, have lived in the place of their usual residence for a continuous period of 12 months prior to the moment of observation, or have arrived to the place of their usual residence during the period of 12 months prior to the moment of observation, with the purpose of living there for a year, at least.
• RENEWABLE ENERGY:  Energy from renewable non-fossil sources, namely wind, solar (solar thermal and solar photovoltaic) and geothermal energy, ambient energy; tide, wave and other ocean energy, hydropower, biomass, landfill gas, sewage treatment plant gas and biogas.
• REFERENCE PERIOD:  Period to which the information refers and which may be a specific day or a time interval (month, fiscal year, calendar year, among others).
• CAPACIDADE INSTALADA DE ENERGIA ELÉTRICA:  Valor correspondente à soma das potências nominais dos equipamentos.

Installed capacity of renewable energy sources (MW) * 1 000 000 / Average annual resident population