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Currently about eighty-five per cent of apartment and condominium buildings use a bulk meter for electricity consumption. The building owner pays the utility bill and electricity is included in the rent or common area expenses --- residents have no information about their own consumption and, have no incentive to conserve. In most buildings sub-metering can be done in less than a week without requiring access to individual units, and, residents benefit from the lower bulk meter rates. Once a building is submetered consumption drops by between 15 to 25%. Many jurisdictions (e.g. Germany) have made it mandatory to 'Smart' Submeter multi-residential buildings.
Explanation: Em Portugal, os medidores do consumo de corrente eléctrica são apelidados de contadores de luz, contadores da luz ou mais formalmente contadores de electricidade. Eu utilizaria "contadores de luz comum".