Law No. 51/2008 on compulsory information regarding primary Energy sources used. Country/Territory Portugal Document type Legislation Date 2008 Source FAO, FAOLEX Original source Diário da República, 1.ª série, No. 165, 27 August 2008, p. 6043. Subject Energy Keyword Access-to-information Basic legislation Energy conservation/energy production International trade Geographical area Europe, Europe and Central Asia, European Union Countries, North Atlantic, North-East Atlantic, Southern Europe Entry into force notes This Law enters into force 180 days after its publication. Abstract This Law is composed of six articles. It requires compulsory information regarding the primary energy source used by all energy traders operating in the national energy market (electricity, gas, oil and other fossil fuels). In particular, the Law compels detailed billing information and regulates publicity and information methods required. Full text Portuguese