Cultural and historic ensemble of the Solovetsky Islands is listed by UNESCO as the World Heritage Site. The Solovetsky archipelago comprises six islands in the western part of the White Sea, covering 300 km2. Population of the biggest island, Bolshoi Solovetsky, is under 1000, and about 30000 tourists visit the Iceland annually. Regular consumption of electricity is under 1,6 MW during the winter, and about 0,8 MW in the summer period. This energy is being produced by 2 diesel generators. There is no hot water supply on the island, but a part of households is connected to a district heating network consuming up to 2,6 MW (winter peak) of heat produced by 2 boilers. ...