The core activities of Solar One Invest AG include:
1. **Real Estate Brokerage**: The company brokers plots of land, commercial properties, rental properties, and residential properties in Switzerland and abroad, particularly in Greece.
2. **Financing**: Solar One Invest AG offers financing solutions for the acquisition of properties and solar systems, working closely with renowned financial institutions.
3. **Renewable Energy**: The company develops and implements solar projects, including photovoltaic systems and thermal solar systems, as well as biogas and wind power projects.
These three core activities are closely interlinked and form the basis of Solar One Invest AG's business model.