and 1978, the hydroelectric plant of Taloro was built in the province of Nuoro (Sardinia). In 1973, the hydroelectric plant of San Fiorano became operational. In 1977, a thermoelectric power plant opened in Torre del Sale, near Piombino (Tuscany). At the end of the 1970s, the construction of the thermal power plant of Porto Tolle (Veneto) began, whose first completed section became active in 1980. Between 1971 and 1977, the pilot 1000 kV transmission facilities in Suvereto (Tuscany) were tested. In 1974, the construction of the Adriatic high voltage electric backbone was completed. Between 1973 and 1977, wells for the production of geothermal energy were drilled in Torre Alfina, in the province of Viterbo (Lazio). The dam of Alto Gesso (Piedmont) was completed in 1982 as part of the hydroelectric power station Luigi Einaudi "Entracque". The 1980s were characterised by the construction of new plants and the testing of alternative forms of energy, the Italian nuclear power phase-out, as well as a gradual reduction of reliance on oil, which decreased from 75.3% in 1973 to 58.5% in 1985. Several large power plants became active during this period. Among these, the fossil fuel power plant of Fiumesanto (Sardinia) in 1983–84; the pumped-storage hydroelectricity power station of Edolo (Lombardy) in 1984–85, one of the biggest of its kind in Europe; and the coal power plant of Torrevaldiagia Nord (Lazio) in 1984. In 1981, with the help of the European Economic Community, Enel built the first large scale compact linear Fresnel reflector concentrated solar power plant, the 1 MWe Eurelios power station in Adrano (Sicily). The plant was shut down in 1987. In 1984, the photovoltaic power station of Vulcano (Sicily) became active. In the same year, the first wind farm of the country became operational in Alta Nurra (Sardinia). During 1985, the national center for the dispatch and control of the electricity network was gradually transferred from the center of Rome to Settebagni, and made a part of a bigger European network for the synchronisation of electricity production. In 1986, Enel had its first positive balance, with a profit of 14.1 billion Italian liras. In 1987, in the aftermath of the Chernobyl disaster, the first referendum on nuclear power took place and was won by those opposed to nuclear power. This result marked the end of nuclear power in Italy, the closing and suspension of all construction of nuclear power stations, and