Greenvolt Opens Hungary’s Largest Battery Storage System

June 15, 2026

Greenvolt Power, the Greenvolt Group company dedicated to developing large-scale renewable energy projects, inaugurated Hungary’s largest battery energy storage system.

Located in Buj, in northeastern Hungary, the project has a capacity of 99.8 MW / 288.6 MWh and is already in operation, the company reports.

In a press release, it is explained that the project incorporates “advanced energy management and real-time optimization systems” and will contribute to increasing the flexibility of the Hungarian grid, supporting frequency and voltage regulation services, strengthening supply security, and enabling greater integration of renewable energy into the national grid.

In European energy markets, “storage is emerging as one of the most relevant technologies for the energy transition,” notes Greenvolt. The increase in electrification, the growing penetration of renewable energies, and the need for more flexible electrical systems are driving, the company says, an “unprecedented demand” for battery storage solutions.

“As electrification increases and the production of renewable energies grows, battery storage is becoming an indispensable element of the energy transition,” states, quoted in a note, João Manso Neto. For the Greenvolt Group CEO, “this project reflects Greenvolt’s conviction in the strategic role of storage for electrical systems and reinforces our position in one of the fastest-growing segments of the sector.”

For his part, Spiros Martinis, CEO of Greenvolt International Power, regards Hungary as “one of the most dynamic energy markets in Central and Eastern Europe, where Greenvolt Power has built a significant presence.”

“Bringing a project of this magnitude into operation is only possible thanks to the experience and execution capacity of our teams, as well as the strong collaboration of all the partners who have accompanied us along this journey,” he adds.

Greenvolt currently has a pipeline of 12.8 GW, weighted by the probability of realization, spread across onshore wind, solar, and battery storage projects, the latter currently representing 5 GW.

Thomas Berger
Thomas Berger
I am a senior reporter at PlusNews, focusing on humanitarian crises and human rights. My work takes me from Geneva to the field, where I seek to highlight the stories of resilience often overlooked in mainstream media. I believe that journalism should not only inform but also inspire solidarity and action.