On 1 July 2007, electricity distribution and trade became independent services provided by respective subsidiaries.

Under European legislation aimed at ensuring non-discriminative conditions on the energy market, in 2007 a legal unbundling of the company took place, resulting in the establishment of ZSE Energia, a.s. as an energy trader and ZSE Distribúcia, a.s., later renamed to Západoslovenská distribučná, a.s., as an independent distribution system operator.

Západoslovenská distribučná, a.s., a subsidiary of ZSE, is the largest electricity distributor in Slovakia with over 1 million supply points.

In 2010 – 2013, ZSE reconstructed a technical heritage object in its assets – the building of the former municipal diesel-powered power plant in Piešťany (this facility started its operations in 1906).

The "Elektrárňa Piešťany", as it is called, serves today as a community centre for education, culture and social activities.