Slovenia’s GEN-I Invest to acquire Bulgarian green energy storage company

Bulgarian diversified group Synergon Holding announced on Friday that its subsidiary Synergon Energy has signed a preliminary agreement with Slovenian renewable energy investment management company GEN-I Invest for the sale of 100% of the shares in the Sofia-based company Green Energy Storage.

According to Synergon Holding’s stock exchange filing, the preliminary contract sets the transaction value at a base purchase price of EUR 6.6 million, minus all financial liabilities of the company as of the closing date, plus cash balances and receivables outstanding at closing.

Earlier this week, Bulgaria’s Commission for Protection of Competition said that GEN-I Invest had requested approval for the full acquisition of two other Bulgarian companies — VANKO-K-2008 and F ENERGY SOLUTIONS — both active in electricity storage through battery energy storage systems.

The deal indicates that GEN-I Invest is not pursuing an isolated acquisition, but is steadily building a broader presence in the fast-growing energy storage segment of Southeast Europe. In the context of accelerating renewable deployment, battery storage is becoming a key infrastructure element for balancing power systems, integrating variable generation, and strengthening overall energy security.

For Bulgaria, the transaction reflects the increasing attractiveness of the national storage market to regional investors. It also signals a transition from fragmented project development toward a more consolidated market structure in which capitalized players seek to secure strategic positions in flexibility and balancing assets.

Comment by the Institute of Danube Research 

 This transaction demonstrates that the energy storage market in Southeast Europe is entering a phase of rapid capitalization and cross-border consolidation. For the Danube–Black Sea region, this is strategically significant, as storage systems are becoming essential for integrating new solar and wind capacity, improving grid stability, and building a more resilient regional energy architecture. In practical terms, the issue is no longer limited to green generation alone — it is about the emergence of a new flexibility market, where competitive advantage will belong to actors capable of combining investment, energy trading, digital management, and battery optimization. For Ukraine, this is an important regional signal: neighboring countries are rapidly developing balancing infrastructure that will increasingly shape the competitiveness of the wider energy space in the years ahead.