Siemens' stake now stands at 45%, up from 28%. Archimede is a joint venture between the German firm and Angelantoni Industries.
The two companies did not disclose financial details of the deal.
Siemens says the objective of the new investment is to accelerate the setup of solar receiver production in Massa Martana, Italy.
Starting from early 2011, the plant will have an annual production capacity of approximately 75,000 solar receivers, which will later be increased to 140,000 per year.
“With
