Green Storage Index

Monthly revenue benchmarks for EEG-compliant storage with charging restricted to co-located generation — 2h and 4h assets, 4 to 10 MW. Two scenarios: wholesale markets (day-ahead + intraday) and full stack including ancillary services (FCR, aFRR).

50.4 EUR/MWh

PV Only · Annual revenue 2025

92 – 159 EUR/MWh

BESS Wholesale · DA + ID · Range

126 – 266 EUR/MWh

BESS DA + ID + aFRR · Range

+82% – +215%

Wholesale uplift vs. PV Only · Range

BESS Duration

BESS Power10 MWp PV

Markets

158.9 EUR/MWh

Wholesale

Ancillary Uplift

PV Only

EUR / MWh

Jahreserlös158.9 EUR/MWh·4h · 10MW · Jan – Dez 2025

Annual Revenues 2025 — Overview

Configuration	Wholesale Only	+ Ancillary	Ancillary Uplift	vs. PV Only
PV Only	50,37554.412 EUR	—	—	Basis
2h · 4 MW	91,791.010.312 EUR	125,711.383.662 EUR	+37%	+82%
4h · 4 MW	112,061.233.420 EUR	146,741.615.135 EUR	+31%	+122%
2h · 6 MW	109,341.203.481 EUR	163,051.794.655 EUR	+49%	+117%
4h · 6 MW	133,931.474.138 EUR	190,792.099.984 EUR	+42%	+166%
2h · 8 MW	124,751.373.096 EUR	198,722.187.267 EUR	+59%	+148%
4h · 8 MW	148,931.639.240 EUR	231,062.543.227 EUR	+55%	+196%
2h · 10 MW	138,071.519.706 EUR	229,592.527.047 EUR	+66%	+174%
4h · 10 MW	158,891.748.867 EUR	266,352.931.656 EUR	+68%	+215%

Annual revenue per configuration in EUR/MWh — relative to annual PV generation. Jan–Dec 2025.

PV Generation 2025 — 10 MWp Reference Asset

10.546 MWh total

Model Assumptions

Period

January – December 2025 (12 months)

Configurations

2h and 4h storage, 4 MW / 6 MW / 10 MW each

Asset type

Green storage (EEG §19) — charging exclusively from co-located renewable generation

Wholesale Only

Day-ahead arbitrage + intraday arbitrage

Wholesale + Ancillary

Additionally FCR (Frequency Containment Reserve) and aFRR (Automatic Frequency Restoration)

Grid fees

Not deducted — gross revenues before grid fees and AgNes surcharge

Model

Catalyst dispatch optimiser (phelas)

Data sources

EEX/EPEX Spot, regelleistung.net

Comparison

BESS Revenue Index

Revenues for standalone storage without charging restrictions — for comparison with green storage revenues.

Read

Analysis

FCA & Grid-Fee Impact

How regulatory constraints affect the revenue stack — relevant for green storage projects.

Read

Note: All analyses and figures are based on simplified model assumptions and historical market data. They are for illustrative purposes and do not constitute investment advice. Project-specific analyses account for individual site parameters, current market prices, and financing structures.

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