Negative Prices Drive Storage Demand
Germany has installed over 130 GW of solar capacity against an average demand of just 65 to 75 GW. This massive overbuilding has led to extreme market conditions, with day-ahead auction prices dropping to around -650 EUR/MWh in May 2026. Consequently, negative price hours are expected to rise to about 1,000 per year in the coming years. In 2025 alone, around 14 TWh of renewable energy was curtailed due to poor prices, highlighting the urgent need for flexibility.
Independent Developers and Tolling Agreements
As of May 2026, independent project developers accounted for 69% of Germany's installed BESS capacity, while energy supply companies held the remaining 31%. This structural shift increases the reliance on debt financing, making predictable revenues essential.
Germany will need 10-14 GW of bankable BESS tolling capacity by the mid-2030s to support project financing.
A whitepaper by PwC and FfE projects that this tolling capacity is critical to secure investments. FfE expects Germany's total BESS capacity to reach up to 28 GW by the mid-2030s, aligning with the national grid development plan's assumption of 40 GW by 2037.
The Shift to Four-Hour Duration
The PwC-FfE report anticipates a strategic shift in storage duration. While installations in the coming years will likely feature two-hour durations, new projects from the 2030s onwards are expected to increasingly adopt four-hour storage durations. This evolution is necessary to meet changing flexibility requirements and maximize revenue through virtual power plant aggregations, which can realize 10% to 20% higher revenues by trading on day-ahead and intraday markets.
Source: solarmagazine.nl / taiyangnews.info
This article was assisted by AI analysis. Please refer to the original source for official information.