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About us

Energetika Slovensko, a.s. (E.SK) is an energy company that was established on July 1, 2025 by merging two stable Slovak suppliers ZSE Energia, a.s. and Východoslovenská energetika a.s. with a century-old tradition.

The merged company under the new business name Energetika Slovensko, a.s. (E.SK) will operate on the market through both the ZSE and VSE brands that customers know today, and they will be able to continue to rely on the stability and security of supply that these brands bring.

The subject of E.SK’s activity is the purchase of electricity and gas from producers and its sale to our approximately 1.3 million customers throughout Slovakia – households, companies and organizations, as well as large and key customers.

The company’s mission is to trade in electricity and gas throughout Slovakia and provide related services in a long-term, reliable, affordable manner, in an environmentally friendly manner and in accordance with the rules applicable in the European Union. In addition to the supply of electricity, gas and related services, we also bring our customers new products and solutions that help them save money, increase the security of their property, health and personal comfort.

Energetika Slovensko, a.s., (E.SK) is a 100% subsidiary of Západoslovenská energetika, a.s.

As a member of the ZSE Group, we are among the leaders in Slovakia in matters of responsible business and its principles are part of our daily decisions and business strategy. Responsible business for us means not only the company’s actions in the energy sector, but also towards local communities and the surrounding environment.

Answers to the most common customer questions regarding the merger of ZSE Energia, a.s. and Východoslovenská energetika, a.s. can be found onthis page.

Establishment of Energetika Slovensko, a.s. (E.SK)

On July 1, 2025, the companies ZSE Energia, a.s., with its registered office at Čulenova 6, 816 47 Bratislava, Company ID: 36 677 281, registered in the Commercial Register of the Municipal Court Bratislava III, Section: Sa, File No.: 3978/B (ZSEE); and Východoslovenská energetika, a.s., with its registered office at Mlynská 31, 042 91 Košice, Company ID: 44 483 767, registered in the Commercial Register of the Municipal Court Košice, Section: Sa, File No.: 1628/V (VSE), merged, with ZSEE being the dissolving company and VSE becoming the successor company.

On the above date, all rights and obligations of the defunct ZSEE were transferred to VSE, which continues as the legal successor of ZSEE with all its previous identification data, with the exception of the trade name and registered office. The new trade name and registered office of VSE from the effective date of the merger is: Energetika Slovensko, a.s., Čulenova 6, 811 09 Bratislava.In communicating with customers, Energetika Slovensko, a.s., (E.SK) continues to use its traditional brands ZSE and VSE.

Annual Report

System of Integrated management

Integrated Management System (IMS) in Energetika Slovensko, a.s. is a comprehensive approach to the Company´s management, combining various management areas into a single coordinated system. The Company’s goal is to achieve and maintain high quality services for its existing and potential customers, secure a stable position in the energy market, while having positive impact on environment, reducing negative impacts on environment, and eliminating safety risks arising from work and working environment.

Energetika Slovensko, a. s. has a certified integrated management system in place, in particular:

• Quality management system according to ISO 9001;
• Environmental management system according to ISO 14 001;
• Occupational health and safety management systems according to ISO 45 001;
• Anti-bribery management systems according to ISO 37 001.