Uniper's 1.7 GW Bid Into Germany's First Capacity Auction: Why the Brownfield Site Decides the StromVKG Result

The question I keep putting to anyone bidding into a capacity auction is short. What did you already own before the rules were written? Germany answers that question this week.

On 2 September 2026 the European Commission approved Germany's capacity mechanism under EU state aid rules. Bids for the first tender under the Electricity Supply Security and Capacity Act, the StromVKG, close on 8 September. That leaves six days between the legal clearance and the deadline, as Energy-Storage.News reported on 3 September 2026. The Bundesnetzagentur opened the round in July. It seeks 4,500 MW of reduced capacity and pays winners for 15 years. Bids are capped at EUR 244,000 per MW a year (Enerdata, 23 July 2026).

The volume is spoken for before the round opens

Uniper says it will bid two hydrogen-ready projects into the German rounds. They sit at Gelsenkirchen-Scholven and Staudinger and total around 1.7 GW. The company set this out on 17 July 2026. Its EUR 5bn plan to 2030 puts about half the money in Germany. RWE has more than 3 GW of new gas capacity ready for the same auctions.

Those two declarations alone come to roughly 4.7 GW. The auction buys reduced capacity rather than nameplate output, so the figures do not net out cleanly. The direction is still obvious. Round one is a contest between a handful of incumbent thermal operators, and the December round will look similar.

Reduced capacity is a different number from nameplate

The Bundesnetzagentur buys availability, then discounts it by statutory reduction factors. A combined-cycle gas plant carries a factor of 0.85. A ten-hour battery carries 0.58, and only a twenty-hour battery reaches the gas factor. Batteries must also show 100 per cent technical availability against 85 per cent for a CCGT. They need a round-trip efficiency of at least 92 per cent. Cells and inverters must come from the EU or from a free trade partner.

Layered together, these rules do the sorting before any price is submitted. Long-term capacity requires ten consecutive hours of output. In 2026 that means gas, and the market knows it.

Location carries a price of its own

The design also steers awards geographically. At least one third of the volume goes first to projects in the grid-technical north. Southern bids are then assessed after a deduction of EUR 16,000 per MW from the bid price. A southern site can therefore bid higher and still rank level with a northern one. Grid congestion has been turned into a number on the bid sheet.

The site is the entry ticket

Here is the part the coverage keeps missing. Uniper demolished cooling towers D and E at Scholven in May 2026. The federal cabinet approved the StromVKG draft on 13 May 2026. Site clearance and lawmaking therefore ran in parallel.

Prequalification runs through the transmission system operators. A bidder needs a grid connection confirmation. It must also prove it is not double funded under the renewables or CHP regimes. Registration and authentication on the regulator's closed platform had to be complete by 1 September 2026. Miss that date and the bid never exists, however sharp the price.

No newcomer assembles a cleared site, a gas connection and a grid confirmation inside a tender window. That work takes years. The auction rewards whoever did it early.

What the decision means beyond Germany

The scale is large. ClientEarth puts the mechanism at between EUR 15.6bn and EUR 35.2bn. The first auction alone costs EUR 1bn to EUR 3bn. The charity and the campaign group Beyond Fossil Fuels both argue the design shuts out storage. The think tank Epico has said 5 GW would be enough through 2035. Germany has reserved 9 GW this year for long-term capacity.

Several member states are drafting their own capacity mechanisms. They now have a cleared template that pays brownfield thermal sites for 15 years. Poland has run a capacity market for years. Polish and Czech utilities hold the same kind of site bank. PGE alone is targeting 7.8 GW of gas capacity by 2030.

What to watch next

Awards from this round set the German EPC pipeline for hydrogen-ready gas plants from 2027. Contracted capacity must be available from 2031, and every winner has to be climate neutral by 2045. A second long-term round follows in December 2026, with a further date in May 2027 if volume goes unsold. Batteries get their first real opening in the duration-neutral round next year.

For sponsors and investors the practical lesson lands now. Audit the site bank before the next auction is designed. The qualifying work has to be finished before the rules are published. For contractors, the German thermal order book is about to be set for a decade by decisions taken this month.