Results of the auctions for biomass plants and for solar installations on buildings and noise barriers that ended on 1 October 2025
Year of issue 2025
Date of issue 2025.12.03
The Bundesnetzagentur has today announced the results of the auctions for biomass plants and for solar installations on buildings and noise barriers. Both auctions closed for bids on 1 October 2025.
"The approval of the biomass package under State aid rules means that biomass plants with successful auction bids can now contribute more to integrating renewable energy into the market. The fact that the auction was oversubscribed shows how well the new rules on financial support have been accepted,"
said Klaus Müller, President of the Bundesnetzagentur. "There has been a reversal in the downward trend in the volume of bids for roof-mounted solar installations, with a slight increase in this auction round."
Approval of biomass package under State aid rules – auction for biomass plants oversubscribed
This was the first auction subject to the new scheme under the biomass package. The European Commission had approved the scheme under State aid rules before the close of the auction. The biomass package constitutes the February 2025 revision of the Renewable Energy Sources Act (EEG) and includes new rules on financial support for biogas plants.
Under the biomass package, financial support is only given to plants that can be operated very flexibly. Biomass plants with successful auction bids are incentivised under the new rules to respond to electricity price signals. The plants therefore make an active contribution to the market integration of volatile solar and wind power. The volume up for auction was also significantly higher.
The auction was for a volume of 813 megawatts (MW). A total of 807 bids with a combined volume of 940 MW were submitted. Some 692 bids were awarded: 33 awards covering 63 MW went to new installations and 659 awards covering 752 MW to existing plants. Some 87 bids had to be excluded from the procedure.
The prices of the successful bids ranged from 11.00 cents per kilowatt hour (ct/kWh) to 19.48 ct/kWh. The average volume-weighted award price in this round was 18.11 ct/kWh, well below the price ceiling for existing plants (19.43 ct/kWh).
The federal states with the largest volumes awarded were Bavaria (266 awards with a combined volume of 276 MW) and, with significantly lower volumes, Lower Saxony (122 awards and 143 MW) and North Rhine-Westphalia (63 awards and 94 MW).
Auction for solar installations on buildings and noise barriers slightly undersubscribed
A total of 140 bids with a combined volume of 310 MW were submitted for the volume of 283 MW up for auction for solar installations on buildings and noise barriers. The Bundesnetzagentur disqualified 19 bids with a volume of 29 MW from the auction. A total of 121 bids with a combined volume of 281 MW were therefore admitted to the auction and were all accepted. The auction was thus slightly undersubscribed.
The prices of the successful bids in the pay-as-bid auction ranged from 8.28 ct/kWh to 10.40 ct/kWh. The volume-weighted average award price was 9.66 ct/kWh, which was higher than that in the previous round (9.22 ct/kWh) but considerably lower than the price ceiling of 10.40 ct/kWh.
The awards were again spread evenly throughout the country. The federal states with the largest volumes awarded for projects were Bavaria (19 awards for a combined volume of 59 MW), followed by North Rhine-Westphalia (29 awards and 57 MW), Brandenburg (12 awards and 32 MW) and Baden-Württemberg (9 awards and 31 MW).
Next steps
Further information about the auctions is available at www.bundesnetzagentur.de/1071264 and www.bundesnetzagentur.de/1071276 (in German).
The Bundesnetzagentur will publish the auction statistics by 10 December 2025.
The next auction for biomass plants will close for bids on 1 April 2026. The date of the next auction for solar installations on buildings and noise barriers is 1 February 2026.
