Interenergo, energetski inženiring, d.o.o.

Interenergo, energetski inženiring, d.o.o. is a Slovenian energy engineering company that for more than two decades operated as the Interenergo Group in the South-East Europe (SEE) region. It is part of the Kelag Group, an Austrian energy group with more than 100 years of tradition in the energy industry, and functions as the group's international operating subsidiary for Europe. Its activities span renewable energy investment, construction and management of power plants, energy trading and energy services for industry and the public sector. The company's core business is the investment, construction and management of electricity production facilities based on renewable sources — primarily hydropower, wind power and photovoltaics — complemented by battery storage development, short- and long-term electricity trading across more than 15 European wholesale markets, and energy solutions such as PPAs, green energy and guarantees of origin. Its portfolio covers 62 projects across Europe with 304 MW of installed capacity and 745 GWh of production in a standard year, and it trades on multiple energy exchanges. Interenergo operates across 14 European markets, with companies in Slovenia, Serbia, Croatia, Bosnia & Herzegovina, North Macedonia, Montenegro, Kosovo, Italy, France, Spain and Portugal, alongside the group headquarters in Klagenfurt, Austria. Its three focus regions are Iberia, the Mediterranean and South-East Europe. In 2026, Interenergo and other international subsidiaries of the Kelag Group underwent a renaming process, adopting the Kelag International name and unifying under one brand. The Interenergo name therefore represents the company's historical identity as the group's SEE-region operator, while Kelag International is the unified brand under which its international renewable energy and energy trading business now operates.

Interenergo, energetski inženiring, d.o.o. is a Slovenian energy engineering company that built its reputation as the Interenergo Group, the operating platform of the Kelag Group in the South-East Europe (SEE) region. According to the company's own account, it first operated in the SEE region as the Interenergo Group for more than two decades, establishing itself as an experienced, efficient and trustworthy partner in renewable energy and energy services. Interenergo is part of the Kelag Group, an Austrian energy group with more than 100 years of tradition in the energy industry. Within the group, Interenergo served as the international subsidiary responsible for operations around Europe, covering the three focus regions of Iberia, the Mediterranean and South-East Europe. Its business model combined the investment, construction and management of renewable power plants — hydro, wind and solar — with electricity trading and energy management services. Over time the company expanded its geographic footprint to 14 European markets, with companies in Slovenia, Serbia, Croatia, Bosnia & Herzegovina, North Macedonia, Montenegro, Kosovo, Italy, France, Spain and Portugal, alongside the group headquarters in Klagenfurt, Austria. Its renewable portfolio grew to 62 projects across Europe, representing 304 MW of installed capacity and 745 GWh of production in a standard year, while its trading desk operated across more than 15 European wholesale markets and multiple energy exchanges. A major turning point came in 2026, when Interenergo and other international subsidiaries of the Kelag Group underwent a renaming process, adopting the Kelag International name and unifying under one brand. This rebranding consolidated the group's international operations under a single identity, with Kelag International positioned as the vehicle for selective growth in hydropower, wind power and photovoltaics as well as energy services across its three focus regions. The Interenergo name remains associated with the company's historical role as the group's SEE-region operator and with its Slovenian legal entity.

• Interenergo begins operating in the South-East Europe region as the Interenergo Group, building more than two decades of experience.

• Interenergo expands its presence to 14 European markets, with companies across SEE, Italy, France, Spain and Portugal.

• Renewable portfolio reaches 62 projects, 304 MW installed capacity and 745 GWh production in a standard year.

• In 2026, Interenergo and other international subsidiaries are renamed and unified under the Kelag International brand.

An experienced, efficient and trustworthy renewable energy partner in South-East Europe and beyond, backed by the Kelag Group's century-long energy tradition and focused on crisis-proof, independent green energy solutions.

• Renewable energy investment, construction and management

  Investment, construction and management of power plants for electricity production from renewable sources, including hydro, wind and solar.

• Battery storage units

  Development and utilization of battery storage units to balance the power system and optimize production facilities.

• Electricity trading

  Short- and long-term electricity trading across more than 15 European wholesale markets and multiple energy exchanges.

• Energy solutions

  Reliable energy solutions for industry and the public sector, including PPAs, green energy and guarantees of origin.

1. 1Home | Kelag Internationalkelag-international.com
2. 2Get to know us | Kelag Internationalkelag-international.com
3. 3About Renewable Energy | Kelag Internationalkelag-international.com
4. 4Get to know us | Kelag Internationalkelag-international.com
5. 5Interenergo, energetski inženiring, d.o.o. — Wikidatawikidata.org