• Complex and inconsistent regulatory requirements make it difficult to plan and implement large-scale battery storage projects. 
• Lengthy and non-transparent approval processes lead to delays and uncertainty. 
• Lack of comparability and transparency in market data and studies complicate economic assessment.

• Systematic research and analysis of the relevant legal, technical, and economic framework conditions for BESS in Germany. 
• Compilation and contextualization of studies, practical examples, and market data for better decision-making. 
• Development of practical recommendations and options for project development and strategic communication.

This report, prepared by Siemens PTI Consulting on behalf of the GESI Green Energy Storage Initiative, delivers a clear view of the rapidly evolving market for large‑scale battery energy storage. It highlights key regulatory developments, emerging technologies, and the dynamics shaping today’s BESS landscape. GESI sees the clear advantage that this analysis ensures comparability and transparency and provides the foundation for site prioritization and the targeted, grid‑supportive development of respective BESS projects.