The regional reanalysis COSMO-R6G2 as a successor to COSMO-REA6: evaluation for renewable energy applications

Bär, Franziska; Borsche, Michael; Kaspar, Frank; Spangehl, Thomas; Yuan, Dehong; Geiger, David; Pauscher, Lukas

doi:10.5194/asr-22-149-2026

Articles | Volume 22

https://doi.org/10.5194/asr-22-149-2026

© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/asr-22-149-2026

© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 22

11 May 2026

| 11 May 2026

The regional reanalysis COSMO-R6G2 as a successor to COSMO-REA6: evaluation for renewable energy applications

Franziska Bär, Michael Borsche, Frank Kaspar, Thomas Spangehl, Dehong Yuan, David Geiger, and Lukas Pauscher

Data sets

ICON-DREAM: ICON-dual resolution reanalysis for emulators, applications and monitoring - the ICON-dual resolution reanalysis version v1.0 Arianna Valmassoi et al. https://doi.org/10.5676/dwd/icon-dream_v1

Regional Reanalysis COSMO-REA6 - Standardised Parameters Christoph Bollmeyer et al. https://doi.org/10.26050/WDCC/CR6_EU6

EUMETSAT CM SAF Surface Radiation Data Set - Heliosat (SARAH) - Edition 3 Uwe Pfeifroth et al. https://doi.org/10.5676/EUM_SAF_CM/SARAH/V003

One year measurements of vertical profiles of wind speed and wind direction from 40 to 500 m at Heligoland, German Bight, North Sea, Germany, Technische Universität Braunschweig T. Rausch et al. https://doi.org/10.1594/PANGAEA.924184

Short summary

COSMO-REA6 is widely used in energy applications but has known deficits. Its successor, COSMO-R6G2, is evaluated for Germany, focusing on Global Horizontal Irradiance (GHI) as well as wind speed. It shows slightly lower GHI and good wind quality in flat areas, but underestimates night-time wind in mountains. Overall, it is a useful successor, though users should consider remaining limitations.