Bulgarian volunteers during the Serbo-Bulgarian War of 1885

December 17, 1879 — Bulgaria’s First Armed Forces Regulation Takes Effect

On this day in 1879, the first document regulating the armed forces of the Principality of Bulgaria took effect. This was an early and necessary step in building the institutions of the newly restored Bulgarian state after liberation from Ottoman rule. The country needed more than patriotic enthusiasm; it needed rules, organization, hierarchy, training, and a legal framework for military service. The regulation helped define how the young principality would structure its defense at a time when its political future was still uncertain and the Balkans remained unstable. It also laid groundwork for later reforms that would expand and modernize the Bulgarian army in the decades before the Balkan Wars.

December 17, 1980 — Kozloduy Nuclear Power Plant Unit 3 Goes into Operation

On this day in 1980, Unit 3 of the Kozloduy Nuclear Power Plant went into operation. Kozloduy was Bulgaria’s first nuclear power station and became one of the most important energy projects in the country’s modern history. The launch of another reactor expanded domestic electricity production and strengthened Bulgaria’s role as a regional energy producer. During the socialist period, nuclear energy was presented as a symbol of technological progress and industrial capacity, but it also created long-term questions about safety, modernization, and international standards. Unit 3 later became part of the wider debate over Bulgaria’s nuclear sector during the country’s path toward European Union membership.

Explore more of Bulgaria’s story on Bronicable, including our Bulgaria From Above series and our guides to the best of Bulgaria.

Continue with December 16 or December 18. For more stories and places, explore Bulgaria From Above and the guides in our Bulgaria category on Bronicable.