Repsol
In 1957, natural gas was also included in the scope of CAMPSA. In 1964, attempts to find oil in Spain were finally crowned with success, although the oil was scarce and of poor quality. The next year, offshore exploration began, and ten years later significant oil reserves were discovered off the Mediterranean coast. In 1965, the state-owned company Hispanica de Petróleos (Hispanoil) was founded to search for oil in Spain and other countries. In 1974, the three refineries were united into Empresa Nacional del Petróleo (ENPETROL), in which the state owned 72% of the shares. On December 18, 1981, most of the participants in the energy market were united into the National Institute of Hydrocarbons (Spanish Instituto Nacional de Hidrocarburos; INH).