Technical Classification
Definition
Analysis of real-world operational restrictions for large-scale battery storage imposed by grid operators: feed-in management, redispatch calls, grid congestion, and curtailment. Quantification of revenue loss risk from grid-operator-imposed interventions.
Technical Background
BESS are subject to feed-in management under Section 13 of the German Energy Industry Act (EnWG) and can be called upon by grid operators for redispatch services. Curtailment risk varies significantly by region: northern Germany (north-south grid congestion) higher than southern Germany. Compensation for curtailment often unclear or insufficient. Up to 5-15% revenue losses from operational restrictions have been documented.
Risks
Revenue losses from forced curtailment. Unclear compensation mechanisms for redispatch calls on storage systems. Increasing integration of BESS in congestion management without secured compensation. Location-dependent risk profile.
Standards & Regulations
EnWG Section 13/13a (system responsibility), Redispatch 2.0 (BNetzA regulation), EEG Section 14 (feed-in management), StromNZV (Electricity Grid Access Ordinance), NABEG (Grid Expansion Acceleration Act).
Assessment Procedures
Location-specific grid analysis (congestion screening). Analysis of historical curtailment data from the responsible grid operator. Review of grid connection agreement for curtailment clauses. Sensitivity analysis for revenue loss scenarios.
Typical Deficiencies
Grid connection contracts often contain unspecific curtailment clauses. Grid operator forecasts on congestion are not binding. Lack of transparency on planned grid expansion and its timing. Compensation for forced non-utilization is inconsistent.
Relevance for Investors, Insurers & Operators
Investors: location due diligence and curtailment risk quantification. Insurers: assessment of business interruption scenarios. Operators: grid connection contract negotiation and revenue protection.
Assessment by PV-BESS-Assessor
The BET/IAEW study documents real-world operational restrictions imposed by grid operators — an often overlooked topic. Practical analysis of feed-in management, redispatch calls, and grid congestion.
Impact on Investors
Warning signal: operational restrictions can significantly reduce planned revenues. Location choice and grid connection agreement are critical success factors.
Impact on Assessments
Directly relevant for technical due diligence: PV-BESS-Assessor reviews grid connection contracts for curtailment clauses and assesses feed-in management risk on a location-specific basis.
Technical Risks
Grid operators can increasingly include BESS in redispatch — with unclear compensation. Grid congestion in southern Germany increases curtailment risk.
Regulatory Significance
Highly relevant for Section 13 EnWG and integration of storage systems in congestion management. Legal clarification of storage system status is needed.
Conclusion by PV-BESS-Assessor
PV-BESS-Assessor considers this study essential reading for every BESS due diligence process. Operational restrictions are a real, quantifiable risk.
Last updated: 16 June 2026