All transmission system operators (TSOs) have developed a joint proposal for a methodology for the preparation of the joint year-ahead, day-ahead and intraday grid models in accordance with Articles 67(1) and 70(1) of the SO Guideline (Commission of August 2, 2017 establishing a guideline for transmission system operation).
The Federal Network Agency (BNetzA) approved the proposal with decision BK6-18-072 on September 20, 2018.
Here you can find the document in the original English and in the German translation as well as the associated application and the decision of the Federal Network Agency: