Theresa Viegener advises and represents national and international companies on energy law matters, in particular with regard to real estate law.

She specializes in drafting, reviewing and negotiating contracts in renewable energy projects, both in transactional work and in advising on the ongoing operation of renewable energy facilities. This includes maintenance and service contracts as well as engineering, procurement and construction contracts.

A particular focus of her work is the interface with real estate law, such as contractual and in rem property security of projects as well as rooftop and building-integrated photovoltaic systems. 

Theresa studied law at the Westphalian Wilhelms University in Münster, completed her legal clerkship at the Higher Regional Court in Frankfurt am Main and obtained a Master of Laws degree in international commercial law in Scotland. She was admitted to the bar in 2018. Before joining Osborne Clarke, she worked as a lawyer at a German commercial law firm in Frankfurt am Main, also in real estate law.


Osborne Clarke advises Obton on 600MW battery storage pipeline with Kyon Energy. Read more here.

OSF Digital

Osborne Clarke advises OSF Digital on the acquisition of netnomics, read more

Galileo Global Education Germany

Osborne Clarke advises Galileo on acquisition of AKAD University, read more

Contact Theresa