Construction and repair of power and energy generation and transmission systems; plumbing and construction services for installation of water and hydrogen gas filling systems for land vehicles; construction of electrical metering systems; electrical contracting services for construction of power system inlets and outlets for providing and receiving electricity; construction of pipelines for hydrogen; custom construction and remodeling of buildings; construction and repair of metal tanks, insulated vessels and vacuum-insulated vessels for compressed and liquefied gasses; data networks and telecommunications industry infrastructure construction and construction and installing indoor, outdoor and underground elements utilized for telecommunications for use in electronic data transmission networks for transmitting and receiving data, monitoring purchases and sales of electricity, hydrogen and water, for verification of consumer and vendor identities, for billing and crediting vendors and consumers for purchase and sale of electricity; installation of electric generators