A worker walks through the facilities of the Carlos Manuel de Céspedes thermoelectric plant in the central province of Cienfuegos. Most of Cuba's thermoelectric plants, almost all of which were built with technology from the now defunct Soviet Union and Eastern European socialist bloc, have a lifespan of 30 to 35 years, and it would take 40 to 80 million dollars to repair and upgrade each one, according to industry executives. CREDIT: Jorge Luis Baños/IPS