- aream GmbH
- 40221 Düsseldorf
- CEE Group
- 20095 Hamburg
- Copenhagen Infrastructure Partners K/S (CIP)
- 2100 Copenhagen Ø
- Europäische Investitionsbank (EIB)
- 2950 Luxembourg
- European Bank of Reconstruction and Development (EBRD)
- London EC2A 2JN
- Hamburg Commercial Bank
- 20095 Hamburg
- KfW
- 60325 Frankfurt am Main
- Luxcara GmbH
- 20354 Hamburg
- Triodos Bank N.V.
- 3700 AB Zeist