Voltpark Blog

Negative power prices were long considered a summer phenomenon. With growing PV and wind capacity, even spring days now suffice to produce surpluses. 2026 is on a record pace — and the sunny half of the year hasn't even started.

Between 2022 and 2025, renewable energy surplus in the German grid has increased fifteenfold. Residual load analysis reveals: The central bottleneck is shifting from installed capacity to temporal flexibility — precisely the sweet spot for battery storage.

The common rule of thumb is: sell at Ready-to-Build. But rising development costs and scarce grid connection commitments are changing the equation. The optimal time to sell is a strategic portfolio decision.

From April 1, 2026, Germany’s four transmission system operators are changing the procedure for large grid connection requests (>100 MW). Instead of “first come, first served”, it will now be “first ready, first served.”

A response we hear repeatedly in conversations with developers about BESS project valuation. What is often underestimated is that financing assumptions have a significant impact on potential project value.

The stability of the power system is undergoing transformation. With the decline of conventional power plants, rotating mass is increasingly disappearing from the grid. This physical inertia has so far been essential for frequency stability.

Ready-to-Build sounds like a clear milestone — but in practice it’s a spectrum. We show why RTB is understood differently by each investor and what this means for project valuations.

The 2025 regional scenarios from distribution system operators are considered an important reference for expected BESS expansion. We compared them with the MaStR inventory — and identified three patterns.

The AgNes framework determination by the Bundesnetzagentur is taking shape. We assess what the planned grid fee regulations mean for battery storage projects, business cases, and investment decisions.

The Federal Court of Justice ruled on July 15, 2025: construction cost subsidies for battery storage are permissible. We explain the implications for project developers and investors.

More and more battery storage projects are receiving grid connection commitments only for 2027 or later. Why this threatens profitability and what developers should do now.

Many battery storage projects stall because authorities request additional assessments — often just before the building permit. Why this happens and what developers can do.