The low-voltage network (220/127 V) was a three-phase type like that in Kazanlak. In 1912-1913, when the network was constructed, Varna had a population of 43 000 people and 64 km total length of the streets 80 °/o of which, i.e. 48 km were electrified. The rest of the streets were not yet covered by the town plan.
The Varna DPP (diesel power plant) was com missioned on January 1st 1914, at the same time with the Enina HPP commissioning. The utility belonged to the Varna municipality.
The town of Rousse was electrified as late as 1917, by the end of the period reviewed here. Since it was a river-port town on the Danube and an important point on the way to Western and Eastern Europe, as well as a cul-tural center, the issue of its electrification was put forward at the very beginning of the 20th century A decision was made for the setting up of a municipal electrification enterprise. In 1911 there were already plans for the con-struction of a diesel power plant and electricity distribution network in the town. A bid was announced for the purpose and it was won by Siemens-Schuckert.
Pursuant to the agreement terms and the bilateral contract the firm Siemens-Schuckert supplied and installed a diesel power plant with the following characteristics:
3 generating sets with four-cylinder compressor vertical diesel engines of 279 hp unit capacity, 187 rpm;
3 three-phase 260 kVA, 3000V, 50 Hz generators, directly coupled to the engines and the respective exciter.
The HV distribution cable network was for 3 kV voltage, with section 3×50 mm2. Nine distribution transformers for 3000/220/127 V were installed in metal construction. The low-voltage network (210/120 V) was an overhead three-phase type. The voltage applied to electrical motors was 210 V, and for lighting purposes-120 V.
Due to the wars Bulgaria was involved in during the second decade of the 20th century, and World War I in particular, the implementation of the Rousse power plant was greatly delayed. It was officially commissioned in 1917.
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