Joint Stock Company “Siltumelektroprojekts” (SEP) is one of the largest design companies in the Baltic States with 70 years of design experience.


The organization specializes in the design of steam and electricity generation companies, as well as provides services in the planning and design of energy and construction projects, development of engineering solutions and cost-effectiveness analysis of projects.
A large part of Latvia’s energy system companies are based on projects developed by JSC “SEP”.


Energy system facilities are constantly being improved in terms of economic efficiency, manufacturability and reliability.


Our company has provided engineering and architectural services for the construction of energy facilities not only in Latvia, but also in Estonia, Lithuania, Russia, Belarus and Ukraine. The total capacity of these facilities exceeds 15,000 megawatts, including condensing power plants, power stations and cogeneration plants, as well as boiler houses in many cities. Hundreds of kilometers of heat network pipelines have been designed to create heat supply systems.


JSC “SEP” has a great experience in the design of oil and light-end product terminals, including the creation of storage tank farms and the construction of oil products loading and unloading racks (the total capacity of the tanks designed by JSC SEP exceeds 3,000,000 m³).

Our branches


Address: JSC Siltumelektroprojekts, branch in Russian Federation, 197022, Saint-Petersburg, Prof.Popova St., 37-Sh.

Phone: +7 (812) 748-54-42



Siltumelektroprojekts A/S, Suomen sivuliike, Energiakuja 3 c/o Technopolis Ruoholahti 2, Helsinki 00180


JSC Siltumelektroprojekts Merkezi Letonya Cumhuriyeti Antalya Merkez Şubesi, Tekelioğlu Cd. Astur Manolya Sitesi B Blok, (A14) Apt. No:90/7
Muratpaşa – Antalya 07230


JSC Siltumelektroprojekts Branch in Hungary,
legal address: 7030 Paks, Ipari park hrsz. 4710/60, Hungary

The engineering company JSC “Siltumelektroprojekts” is registered in the Register of Latvian Construction Merchants and also complies with ISO standards in its activities, as evidenced by the ISO Quality Assurance Certificate in terms of design, in accordance with ISO 9001-2015, as well as in terms of ecology, occupational health and safety, according to ISO 14001-2015 and ISO 45001-2018.

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