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Germany offshore wind capacity net additions

Germany offshore wind capacity net additions stood at 240 Megawatts in Sep 2026, according to Fraunhofer Institute for Solar Energy Systems ISE and Federal Network Agency (Bundesnetzagentur). It is one of the indicators in the Renewable power expansion table (Value · Monthly), with a complete series running from Aug 2025 to Sep 2026. The complete series with an interactive chart, free to download.

Source: Fraunhofer Institute for Solar Energy Systems ISE and Federal Network Agency (Bundesnetzagentur)Last updated: Curated by Bui Thanh Phuc
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This indicator in the Renewable power expansion table

Indicator09-202608-202607-202606-202605-202604-202603-202602-202601-202612-2025
Monthly net additions to capacity (Bundesnetzagentur, MaStR)
Offshore wind240356.55131.55195211.35203.25182.4114.3170.85503.4
Biomass1.045.2911.374.621.483.04-0.73-5.1117.610.72

Understanding germany offshore wind capacity net additions

Newly connected marine wind generation forms the sole focus of this specialized monthly flow indicator from the Bundesnetzagentur's MaStR database. The metric quantifies the net electrical rating of operational turbines added to territorial waters and offshore economic zones, factoring out any rare decommissions of legacy maritime equipment. This indicator is entirely decoupled from terrestrial wind measurements, isolating the distinct, massive-scale additions that characterize oceanic energy engineering. It captures the precise moment when newly erected sea-based generator arrays officially begin transmitting commercial electricity through subsea high-voltage cables to the mainland network.

Sequential monthly readings of marine additions are exceptionally volatile, as the logistical realities of offshore construction result in long periods of no new capacity punctuated by sudden massive surges. Consequently, evaluating year-on-year cumulative additions or using multi-month rolling averages is the preferred method for understanding the true pace of maritime wind deployment. Retrospective revisions are uncommon but can occur if initial grid integration issues force a temporary downgrade of a newly synchronized array's registered output. A common pitfall is conflating these monthly activation figures with actual physical construction progress, as turbine monopiles and blades may sit idle in the ocean for months awaiting final electrical substation connectivity.

Frequently asked questions

Why does this series frequently record no new capacity for consecutive months?
Marine wind farms are constructed in massive phases, meaning capacity only registers when an entire cluster of turbines is simultaneously connected to the mainland.
Do floating wind turbines count toward these monthly additions?
Any newly registered marine turbine capable of grid exportation is included, regardless of whether it utilizes a fixed foundation or a floating tethered platform.
Are disconnected test turbines removed from this net calculation?
If an experimental marine generator is permanently decommissioned and removed from the grid registry, its capacity is subtracted from the month's overall additions.

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