A transformación do mix eléctrico nas últimas décadas foi un dos piaresfundamentais da estratexia empresarial no sector enerxético. Tendo en conta as enormesdiferenzas entre países, a escasa conexión eléctrica europea e o grao de concentraciónempresarial, avalíase a evolución en 6 países europeos. O presente estudo realiza unhaanálise descritiva desta transformación, tendo en conta a evolución de diversas variablescuantitativas no sector. As evolucións son dispares, baseadas moitas veces en realidadesestatais diferentes. A mesma estrutura do sector, dende mercados liberalizados eteoricamente en competencia con outros regulados e baseados en campións nacionaiscomo grandes empresas eléctricas que controlan boa parte do sector impide realidadessemellantes, malia que a regulación europea trata de homologar a realidade continentalpara o sector. Do mesmo xeito, as transformacións internacionais teñen un impactodeterminante na toma de decisións semellantes do sector, malia que moitas veces conestratexias dispares. En particular, a redución do consumo de fuel oil para a produción e aintrodución de novas tecnoloxías renovables son procesos comúns por múltiplesempresas. O presente traballo trata tamén de realizar un estudo comparativo, dende unhaperspectiva rexional, dunha importante empresa eléctrica como Unión Fenosa con parteda contorna europea nos anos de vida da compañía, entre 1982 e 2007.The transformation of the electricity mix in the past decades has become one ofthe cornerstones of business strategies in the energy industry. Whilst weighing theconsiderable differences among countries, the scarce electricity connection in Europe andthe degree of existing business clusters, the evolution is assessed in six Europeancountries. This paper aims to offer a descriptive analysis of such changes, bearing in mindthe evolution of various quantitative variables in the industry. Progress is unalike,frequently based on different state circumstances. The mere structure of the industry,from liberalized markets theoretically competing against other regulated ones which arenational leaders as big electrical companies controlling a huge share of the industry,presents similar circumstances despite the fact that European regulations aims tostandardize conditions throughout the continent in the industry. Likewise, internationaltransformations have a fundamental impact on similar decision-making processes in theindustry, even though these might often result in different strategies. In particular, areduction of fuel oil comsumption encouraging the production and introduction ofrenewable technologies are common processes for several companies. This paper alsoaims to present a regional comparative study between an electricity provider as importantas Unión Fenosa and the European zone during the years the company has existed, ie,between 1982 and 2007