Elia Plc.
- Specialized in design, development, manufacturing, and maintenance of electrical systems for power networks, industrial plants, and commercial buildings.
- http://www.eliaplc.com/about_us_en_1.htm

DIT-M Ltd.
- Diagnostics, repairs and modernization of power and auto transformers, high voltage outlets up to 400 kV, step regulators, analysis of power efficiency of enterprises, consulting and engineering.
- http://www.ditm.visa.bg/index_en.html

Natsionalna Elektricheska Kompania EAD
- Purchases, transports and sells to high-voltage customers and power distribution companies the electricity generated by the company itself, and by power generation companies within the system of the Ministry of Energy and Energy Resources.
- http://www.nek.bg/cgi-bin/index.cgi?l=2

Black Sea Regional Energy Center
- Provides projects, studies and Black Sea energy review, events and newsletters.
- http://www.bsrec.bg/