BESS A — Utility-Scale Storage
60 MW / 226 MWh · 110 kV transmission · Kyustendil energy cluster · Permitting stage
Flagship project | Managed dispatch via licensed trader (EPO)
BESS A — 226 MWh / 60 MW
Kyustendil cluster — transmission-connected flagship
BESS A is ZiRi's utility-scale Battery Energy Storage System in Kyustendil, Bulgaria: 60 MW power and 226 MWh installed capacity (approximately 203 MWh usable), on a 110 kV transmission path. It sits in a co-located portfolio with grid access at two nodes, alongside complementary projects and dedicated infrastructure. The asset is designed for merchant optimisation (day-ahead, intraday, and balancing/ancillary participation where qualified), with operations aligned to the same revenue stack used on ZiRi's reference fleet. The project is in the permitting phase; timing follows ESO and permitting milestones.
Qualified investors
Fixed turnkey acquisition terms and detailed economics are available in the Investor Tools portal after login. Public pages describe the project qualitatively only.
Highlights
- Scale: One of the largest independent BESS footprints in the region — economies of scale in build, O&M, and market access.
- Grid: Transmission-level connection and cluster positioning next to scarce 110 kV capacity.
- Market design: Bulgaria recognises storage under the Energy Act; IBEX products support arbitrage and balancing participation subject to rules and qualification.
- Operator track record: Same optimisation philosophy as live large-scale BESS in the region (EPO-managed stack).
Key parameters
- Installed energy: 226 MWh (LiFePO4)
- Usable energy (approx.): ~203 MWh
- Power: 60 MW continuous (bi-directional)
- Duration at full power: ~3.8 hours
- Grid: 110 kV transmission (ESO)
- Location: Kyustendil cluster (~2 km co-location radius with sister projects)
- Efficiency / chemistry: High round-trip efficiency LFP (tier-1 supply chain)
Technical specifications
| Parameter | Specification |
|---|---|
| Battery technology | Lithium Iron Phosphate (LiFePO4) |
| Installed capacity | 226 MWh (~203 MWh usable) |
| Power | 60 MW continuous (bi-directional) |
| Duration at full power | ~3.8 hours |
| Grid connection | 110 kV transmission |
| Status | Permitting (Kyustendil cluster) |
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Market & revenue context
Bulgaria's power market combines rising renewable output with liquid day-ahead and intraday products. Large-scale storage captures spreads and, subject to access rules, contributes to balancing. No forward-looking financial numbers are shown on this public page.
- IBEX: Day-ahead and intraday trading; see ibex.bg and products traded.
- Regulatory: Storage is recognised as an asset class under national energy law; participation in specific services depends on qualification and contracts.