There is a section on their website about GRI, although the period covered is not clear. https://csr.50hertz.com/en/Sustainability-Report/GRI

p. 4 "Although reporting in accordance with the EU

Sustainability Reporting Directive (CSRD) along the required standards is not yet

mandatory under German law, Eurogrid has decided to prepare the non-financial

statement on the basis of the European Sustainability Reporting Standards (ESRS)."

p. 79 "Scopes 1, 2, 3 GHG emissions are quantified using the Greenhouse Gas Protocol methodology."