Sofia, like many cities in Eastern Europe, is surrounded by sprawling prefabricated housing estates, built during the socialist period. More than 60 per cent of the population live in buildings like these. With soaring energy prices and no coordinated support to upgrading, UNECE is working alongside local partners to improve the energy efficiency of such buildings. With energy bills cut by as much as 50 percent in some cases, the money invested in the renovations can be recouped in just a couple of years.
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