GEN-I Sonce’s 220 MWh battery energy storage system (BESS) project in Romania, located at Gheorgheni in the country’s eastern Transylvania region, will be delivered by Bucharest-headquartered Waldevar Energy.
An EPC contract was signed to deliver the 55 MW / 220 MWh BESS by the pair, and comes following the same partners agreeing to work on the Gheorgheni 110 kV, 63 MVA substation in the area, as announced at Intersolar Europe 2026. Under the agreement, WALDEVAR Energy will deliver the scope of works by Q3 2027, covering engineering, procurement, construction, installation, testing and commissioning.
The company says it has a portfolio of over 3.5 GW of projects, a team of over 2,000 specialists, and a fleet of 400 specialized machines.
Developer GEN-I Sonce is one of Slovenia’s leading providers of renewable energy solutions. It previously told the media that its portfolio of utility-scale BESS under operation would reach 800 MW by the end of 2026. In July, the investment arm of the company, GEN-I Invest, acquired three operational BESS sites in neighboring Bulgaria, adding 30 MW / 76 MWh in total across facilities at Belovo, Momchilgrad, and Parvomay 1.
What they said:
Cristian Dragomir, CEO of Waldevar Energy said: “For years, the industry’s priority was adding renewable generation. Today, the challenge is making energy available when the system actually needs it. Battery storage is becoming one of the most strategic assets in the energy sector because it provides the flexibility to store energy and discharge it when demand or system conditions require it. Gheorgheni is a strong example of how large-scale BESS can contribute to a more flexible and resilient energy system. This project also marks another important step in our growing partnership with GEN-I Sonce and strengthens Waldevar’s capabilities in delivering complex utility-scale BESS projects across Europe.”
Gregor Hudohmet, CEO of GEN-I Sonce added:“This is the largest and most important project for the GEN-I Group and our first EPC project with Waldevar Energy in Romania. It is also the first step in a scalable model for how we develop and deliver energy storage projects. We believe the experience gained here will shape the projects that follow, and we are grateful for the trust and support of the local community and authorities in Gheorgheni.”
Len Emil Balázs, Vice Mayor of Gheorgheni:“Today marks the beginning of an important project for Gheorgheni. A battery energy storage project developed by GEN-I Sonce and executed by WALDEVAR Energy will build the infrastructure needed to generate power to the national grid. Years from now, we will be proud of what we built here together.”
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