A majority of rooftop solar system installations require interconnection with the local power utility's grid. This often is referred to as "distributed solar." When this occurs, a building owner may be required to enter into an agreement with the local utility and required to pay a connection fee. These utility agreements are regulated by the states and vary significantly. The prime contractor for a rooftop solar installation often is responsible to communicate with a local utility to ensure the requirements in a specific interconnection agreement are met, including specific inspection scheduling tasks and commissioning processes.