Marmon Utility, LLC - A division of The Marmon Group, LLC Marmon Utility delivers the trusted Kerite and Henrix cable alongside an end-to-end partnership, helping you power your customers. Think of Marmon Utility as a family of solution providers and risk-reducers for utilities across the country and around the world. The common attribute among our customers is their reliance on us for a seamless product-service continuum that combines (and coordinates) engineering, project design, delivery, installation, training, testing, monitoring and more capabilities than one ad can describe.