The HSE Group is the largest producer and seller of electricity from domestic sources on the wholesale market in Slovenia and the largest Slovenian producer of electricity from renewable sources. Our other activities include provision of systemic services needed for the functioning of the electricity system in Slovenia, and management and implementation of energy and environmental projects.
Membership of the HSE Group in national and international associations:
- Chamber of Commerce and Industry of Slovenia
- Slovenian Energy Chamber
- Union of the Electricity Industry – Eurelectric
- Slovenian Association for energy economics
- Energy Market Data Exchange Section
- Electrotechnical Association of Slovenia
- Slovenian electric power engineers
- The Slovenian Chamber of Engineers


HSE-EDT Trbovlje d.o.o.
Ob železnici 27
1420 Trbovlje
Srednjesavske elektrarne d.o.o.
Ob Železnici 27
SI – 1420 Trbovlje

HSE SaŠa
Cesta Lole Ribarja 18
3325 Šoštanj

RGP d.o.o.
Rudarska cesta 6
3320 Velenje

HOLDING SLOVENSKE ELEKTRARNE
HSE is the controlling company in the HSE Group
It has headquarters in Ljubljana and business units in Maribor, Šoštanj and Nova Gorica.

DRAVSKE ELEKTRARNE MARIBOR
DRAVSKE ELEKTRARNE MARIBOR (DEM) IS THE LARGEST SLOVENIAN PRODUCER OF ELECTRICITY FROM RENEWABLE SOURCES
It operates eight hydro power plants on the Drava river, three small hydro power plants and four solar power plants.

SOŠKE ELEKTRARNE NOVA GORICA
WE ALSO PRODUCE ELECTRICITY FROM RENEWABLE SOURCES WITH HELP FROM THE EMERALD RIVER SOČA
Soške elektrarne Nova Gorica operates five large, 21 small and one pumped-storage hydro power plant.

HSE INVEST
A COMPANY FOR ENGINEERING AND CONSTRUCTION OF ENERGY FACILITIES
Its most important activity is managing development projects in the pre-investment phase, managing projects of construction of new energy facilities or reconstruction of the existing facilities, and drawing up of all phases of project documentation for energy and other facilities.

HSE - Energetska družba Trbovlje
HSE – EDT IS THE LEGAL SUCCESSOR OF THE TRBOVLJE THERMAL POWER PLANT, WHICH WAS IN LIQUIDATION BETWEEN 2014 AND 2017.
The company continues to perform services of storage of petroleum products as part of the statutory national reserves and systemic services in the power system. Two gas-powered generators have been preserved at the location and may be launched for local operation in the case of an emergency.

ECE
ECE – ELECTRICITY, NATURAL GAS AND WOODY BIOMASS SUPPLIER
Providing a broad range of energy solutions tailored to the customers, and offering well-priced trade goods in its own online store.

HSE SAŠA
GREEN TRANSITION PROJECTS
Following the anticipated cessation of coal mining, the Šalek Valley is facing an exceptionally important period of restructuring, which will be marked by a green transition. The key strategy will enable long-term environmental, economic and social sustainability. Renewable energy sources will play a crucial role in the transformation of the valley. Part of the key green transition investments will take place in the area of the current Šoštanj Thermal Power Plant. These include projects such as the floating solar power plant on Lake Družmirje, a restructure of the district heating system, and the introduction of hydrogen technologies and other innovative projects in the Šalek Valley, which will be overseen by the company, HSE SaŠa.