Natural gas, natural gas liquids, procurement services, namely, the purchase for others of natural gas, natural gas liquids, petroleum and other fuels; operation of business for others, namely, operation of natural gas processing and storage facilities; marketing services, namely, promoting the use of natural gas in residential, commercial, industrial, municipal and utility customers; billing services pertaining to the provision of [ gas utilities, ] natural gas processing and storage services; promoting public awareness of the efficient use of natural gas; association services, namely, promoting use of natural gas and environmental concerns in connection with energy production

[ Construction services, namely, constructing structures and facilities for use in the natural gas, transportation, processing, storage, distribution, marketing and trading industries; installation and maintenance of natural gas refueling stations; vehicle repair services, namely, converting conventional fueled vehicles to natural gas; installation and maintenance of gas, and petroleum product pipeline ]

Gas utility services, namely, production, transportation, storage and distribution of natural gas, natural gas liquids, petroleum, and other fuels; natural gas storage services, namely, the storage of natural gas in owned or leased gas storage facilities; natural gas pipeline services, namely, the transmission of natural gas through pipelines [ ; public utility services in the nature of compressed natural gas distribution services ]

Production, processing and treating of energy, namely, natural gas, natural gas liquids, and other petroleum products

[ Research and design services, namely, designing, testing and evaluating natural gas storage and processing facilities, storage tanks and carburetion systems for vehicular use of natural gas, including compressed natural gas; providing information on effective use of natural gas and safety guidelines and tips for use of natural gas; technical design of energy efficient homes and commercial structures for others ]