Installation, maintenance and repair of energy-using systems; construction and maintenance of cogeneration, thermal and independent electric power production facilities for others; fire alarm installation and repair; electrical contracting; installation of kitchen appliances specifically, stoves, dishwashers and ranges; maintenance and repair of burners; laying and construction of pipelines; electrical repairs and installation of appliances; natural gas pipeline installation and repair; maintenance and repair of boilers, steam turbines, gas turbines, electric substations, transformers, and generator voltage regulators for others in the energy field; construction and renovation of electric substations for others in the energy field; repair of piping and boiler insulation and refractory; machinery repair and maintenance; installation and construction of natural gas mains; installation and construction of underground electric distribution systems; removal and installation of boiler, pipe and electrical main insulation and lagging; repair for others of pressure vessels, natural gas pipeline, hangers, turbine parts, large bore piping systems; repair, installation, and maintenance of large and small home appliances and HVAC; electrical contractor services provided in the utility industry

Utility services, namely, transmission of unregulated natural gas through pipelines and electricity; utility services in the nature of distribution and transmission of natural gas through pipelines and electricity and thermal energy to industrial, commercial, institutional and residential customers; distribution of energy; public utility services, namely, the transmission of electricity and natural gas; public utility services; electric and gas public utility services