1929 - Compania Espanola de Petroleos, S.A. is set up. First private oil company.
    1930 - First Spanish refinery: Tenerife. First supplier of marine fuel (bunker).
    1950 - First Spanish producer of lubricants.
    1954 - First platforming unit in Spain. (Platforming is a process for enhancing the quality of gasoline.) First Spanish producer of aromatic petrochemical products.
    1969 - Second refinery: Gibraltar. One of the most important petrochemical complexes in Europe.
    1970 - Start of collaboration with leading multinationals in the petrochemical industry.
    1980 - Network of branches and subsidiary marketing companies in Spain and other European countries.
    1984/1987 - The petrochemical subsidiaries PETRESA and INTERQUISA become 100% CEPSA-owned.
    1988 - IPIC joins shareholding body.
    1990 - Elf Aquitaine joins shareholding body.
    1991 - Acquisition of ERTOIL and third refinery: La Rábida.
    1992 - Purchase of 25% of CAMPSA commercial assets.
    1994 - Acquisition of ERTISA. Discovery of crude oil in Algeria.
    1995 - First industrial plant in North America: PETRESA Canada, Inc.
    1996 - Extraction of crude begins in Algeria. Sale of propane and butane to final consumers.
    1997 - Complete merger of ERTOIL into CEPSA.
    1998 - New butane cylinder of stainless steel, safer and with only half the weight of the traditional cylinder.
    1999 - PETRESA (100% CEPSA) acquires DETEN, a Brazilian producer of linear alkylbenzene (LAB).
    2000 - CEPSA, pioneer in the marketing of butane cylinders via its network of service stations.
    2001 - Construction begins on second petrochemical facility in Canada: INTERQUISA Canada Inc.
    2002 - MEDGAZ Project: technical feasibility of new Algerian-European gas pipeline via Spain confirmed. Second oil field in Algeria, OURHOUD, placed on stream.