42 utility services, namely, sale and/or delivery of energy to residential, commercial, governmental and industrial users; sale and/or delivery of energy to other utilities; extraction, sale and/or delivery of natural gas to residential, commercial, governmental and industrial users; and technical research and development directed toward fuel extraction, energy generation, delivery and use and installation, maintenance and repairs of related equipment, technical research and development of new products for fuel extraction, energy generation and delivery and maintenance and repair of energy-producing equipment