In operation for more than 100 years, Hawaiian Electric Company offers a range of energy and related services. The company serves various clients in the air transportation, manufacturing, retail food, banking, new construction and agricultural pumping industries. Hawaiian Electric Company provides a variety of project management and installation services. It offers a range of water heaters for residential customers. The company conducts a variety of educational workshops and activities for the promotion of native plant use. Hawaiian Electric Company operates two subsidiaries, including Maui Electric Company and Hawaii Electric Light Company. It also maintains a trouble service center.