Building construction; building, construction, maintenance and repair of power plants, power-generating installations and transmission lines; construction, maintenance, and repair of equipment and installations for the generation, production, storage and distribution of energy, including heat; construction and maintenance of pipelines for the transport and distribution of fuel, heat and water; maintaining landfill gas-to-energy facilities; installation, construction project commissioning, and maintenance of landfill energy facilities for others

Operating landfill gas-to-energy production facilities; operation of landfill energy production facilities for others