Installed power
4.43 GW
537 units in operation
BESS Index
The market in numbers – updated daily.
The BESS Index combines market volume, revenue indicators and pipeline from public primary sources: Marktstammdatenregister, the TSO ancillary-services data center and day-ahead prices. Every metric carries source, period and methodology.
Refreshing …As of: MaStR 21/09/2026 · Regelleistung 21/09/2026 · Day-Ahead 21/09/2026
Market volume (MaStR, batteries ≥ 1 MW)
Installed capacity
7.64 GWh
Median duration: 2 h
Pipeline (planned)
11.63 GW
697 units planned
Pipeline capacity
34.36 GWh
Revenue indicators (Germany)
FCR capacity price · 30 days
497 €/MW·day
≈ 146.7 k€ per year
aFRR capacity (POS+NEG) · 30 days
135 €/MW·day
≈ 54.7 k€ per year
mFRR capacity (POS+NEG) · 30 days
113 €/MW·day
≈ 28.8 k€ per year
DA arbitrage indicator · 30 days
479 €/MW·day
≈ 102.2 k€ per year
Avg day-ahead spread · 30 days
220 €/MWh
365 days: 161 €/MWh
Negative price hours · YTD
459 h
365 days: 509 h
Arbitrage indicator, last 60 days (2h system, 2 cycles, gross)
FCR capacity price, last 60 days
Additions & pipeline
Commissioned 2025
838 MW
105 units
Commissioned 2026
1.78 GW
176 units
Planned 2027
3.93 GW
213 units
Planned 2028
4.44 GW
74 units
Sources: Marktstammdatenregister (Bundesnetzagentur), regelleistung.net (German TSO data center), Fraunhofer ISE Energy-Charts (CC BY 4.0). Indicative market values, not a revenue forecast.
Methodology
- Market volume
- Marktstammdatenregister (BNetzA): storage units with technology "battery" and gross power ≥ 1 MW. Status "in operation" or "planned" per register. Weekly sync.
- FCR capacity price
- regelleistung.net: local marginal capacity price DE-LU per 4h block (pay-as-cleared), summed over 6 blocks = €/MW per day. Annual value = 365-day average × 365.
- aFRR / mFRR
- regelleistung.net: volume-weighted average of awarded capacity prices per 4h block, POS and NEG added (a battery can offer both directions).
- DA arbitrage indicator
- Energy-Charts (Fraunhofer ISE): 15-minute day-ahead prices DE-LU. For a 1 MW / 2 MWh system the best 2h charge and 2h discharge block is found per half-day (max. 2 cycles). Gross, before efficiency and grid fees; the annual value in the revenue model is scaled by 86 % round-trip efficiency.
- Negative price hours
- Sum of quarter-hours with day-ahead price < 0 €/MWh, converted to hours.
Snapshot last updated: 21/09/2026 · CAPEX and revenue benchmarks remain model-based until partner data is available.
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The benchmarks provide project-related comparison values.