35 Advertising services; business management services; business administration; Providing office functions; Advertising and marketing services, namely, advertising and marketing of the products and services of power and water supply companies through professional business consultancy, market research, public relations, arranging exhibitions and trade fairs for advertising purposes, distribution of samples and demonstration of goods for advertising purposes and through advertising; business management of energy generation and distribution installations; organisational and professional business consultancy in the fields of energy, fuel cells, wind power plants and photovoltaic installations; Marketing services, namely, the promotional marketing of new technologies, in particular in the environment and energy sector; Business operation of power generation equipment and facilities for others, namely, operating power stations, in particular hydroelectric power stations, wind power plants, photovoltaic installations; business information; business consultancy and advisory services; business management and organisation consultancy services; wholesale and retail electricity and natural gas provider services, namely, providing a service that allows customers to purchase energy, namely, electricity and natural gas; Operation of business for others, namely, technical operational management of power stations, in particular hydroelectric power stations, hydroelectric and wind power plants, photovoltaic installations, transformer stations, solar power stations, wind power stations and biogas power stations; Energy usage management, namely, technical consultancy and planning of energy usage from energy generation and distribution installations, fuel cells, wind power installations and photovoltaic installations; Operation of business for others, namely, technical operational management of power plants with energy generation and distribution installations, fuel cells, wind power plants and photovoltaic installations; Energy usage management services in all areas of energy and water management and supply, namely, producing energy management analyses and technical strategies taking into account ecology and infrastructure