The consortium behind what would be the biggest ever solar energy initiative will first raise awareness and interest among other investors for the project, known as Desertec, which is estimated to cost around €400bn (£338bn).
Torsten Jeworrek, board member of Munich Re, the German reinsurer which is leading the project, said: "We want to found an initiative which over the next two to three years will put concrete measures on the table."
Like other reinsurers, Munich Re has said it is expecting to face mounting claims in the coming years for damage caused by climate change.
The companies – including Siemens, Deutsche Bank, and the energy companies RWE and E.on – will meet on July 13 in Munich to draw up an agreement. German government ministries as well as the Club of Rome, a Zurich-based NGO of leading scientists, managers and politicians which advocates sustainable development, are also expected to be present.
It is seen as particularly significant that the companies aim to start the expensive initiative in the midst of a financial crisis. But although none of the companies is keen to go into detail yet about their involvement, they stress that the project is a chance for them to drive forward the fight against climate change and in doing so to position themselves at the top of the green technology industry. Germany, despite its relative lack of sun, has become a leader in solar energy.