Planning, design, installation, assembly, maintenance, repair, renovation, and trade in the fields of renewable energies and building technology, particularly photovoltaic and solar thermal systems, energy storage, e-mobility and charging infrastructure, heat pumps, heating, ventilation, air conditioning and sanitary systems, as well as electrical and building technology systems, providing services in the fields of energy consulting, planning, engineering, construction supervision, service, maintenance and technical building equipment as well as trade with corresponding products and components. Can acquire, hold, manage, lease, rent, develop, encumber and dispose of real estate and properties both domestically and abroad, as well as realize and operate construction and real estate projects. Can establish branches and subsidiaries both domestically and abroad, participate in other enterprises, acquire or establish similar or related enterprises, and conduct all business and conclude contracts that are suitable to promote the purpose of the company or are directly or indirectly related thereto.