Full Breakdown
Bulgaria’s Battery Storage Surge: From Zero to a Quarter of Power Capacity in Two Years
By Drooid · · How we work
Core Development: Rapid Expansion of Battery Storage
In less than two years, Bulgaria’s battery-energy-storage-system (BESS) capacity grew from virtually none to roughly 5.7 GW of operational power, about 25 % of the country’s total installed generation capacity. The build-out was driven by €700 million in EU Next Generation recovery-fund and RESTORE programme financing for 113 projects, complemented by private capital estimated at almost €2 billion. The Ministry of Energy confirmed the 5.7 GW figure to AFP.
Background & Context
The surge coincided with a regional push toward renewable electricity. Bulgaria’s photovoltaic capacity more than quadrupled between 2022 and 2026, creating daytime surpluses that batteries can absorb. A severe summer drought in 2024-2025 reduced nuclear and hydro output in neighboring Hungary, Romania and the Danube basin, prompting Bulgaria to export stored energy to those markets. EU funding and streamlined permitting have made Bulgaria attractive to investors from the EU and China, the primary source of lithium cells.
Data & Statistics
- Battery capacity: 5.7 GW operational (Ministry of Energy, DW).
- Funding mix: €700 million EU support; ~€2 billion private investment.
- Export flow: In July 2026, Bulgaria exported ~830 GWh of electricity, roughly twice the May-June average; Romania accounted for nearly half of the outward transfers, valued at about €74 million.
- Price impact: Between 1 – 16 August, the average day-ahead price was €132.2/MWh, about €14 lower than Romania’s price.
- Project count: Around 100 BESS sites are operating, most built in the past two years.
- Regional share: Bulgaria contributed about 9 % of Europe’s 2025 battery-storage additions and 2 % of solar additions.
Official Statements & Responses
The energy ministry emphasized that storage must be paired with upgrades to transmission and distribution networks to ensure a “sustainable role” for batteries. Former energy minister Delyan Dobrev, speaking to Focus in September, announced advanced talks with the United States.
Verbatim Quotes
- “Such record development should always be taken with a pinch of salt,” — Kaloyan Staykov
- “The scale and speed of storage deployment in Bulgaria is unprecedented in a European context,” — Stavros Papathanassiou, professor, National Technical University of Athens
- “We could leverage the large connection to the grid. We decided to disconnect one coal unit and connect batteries,” — Vassil Shtonov, head of Bulgaria operations, ContourGlobal
Conflicting Reports & Gaps
Sources agree that batteries have lowered evening electricity prices, yet no measurement isolates the precise contribution of storage to overall price trends. Analysts differ on the durability of the model beyond the summer snapshot, citing limited storage duration (typically 1-6 hours) and grid-connection constraints that prevent batteries from fully substituting nuclear or hydro generation during prolonged droughts.
What’s Next
Bulgaria plans to repurpose part of the former Maritsa East 3 coal plant for battery installation, while the Kozloduy Nuclear Power Plant is slated for two new reactors in the coming years. Rehabilitation of the large pumped-storage hydro facility at Chaira is also underway, and further EU-backed projects are expected as the country seeks to balance rapid battery deployment with grid stability and conventional generation needs.
