October 18, 2018 in Berlin
First exchange between Stefan and Erik on the occasion of Smart & Green on Stage. Then various Skype conversations and emails to prepare the collaboration.
Shortly afterwards, a meeting and exchange also took place in Zurich HB, Restaurant Oase, where Sesto met Erik personally.

November 16, 2018 in Berlin
Stefan visits Greenstone in Berlin, Sesto is temporarily prevented. He has the important parameters explained by the specialists (management, IT and finance) and gets to know the employees.
We receive the business plan from Greenstone and discuss the relevant figures for the future cooperative. These are recorded in a document and continuously updated.

April 11, 2019 in Berlin
Stefan met management members and had discussions with them. Erik Oldekop also introduced Stefan Holger Heims, one of the early investors at Greenstone Energy.

August 7, 2019 in Berlin
Stefan and Sesto meet at Greenstone Erik, Gül and David and discuss the landing page and the project partner documents. The documents will be signed at the next meeting in September 2019 in Berlin.

September 25-27 2019
The project partner agreement with Greenstone is signed in Berlin