The approval path
DOE’s homebuilder guide says a local utility interconnection agreement is needed to activate a system’s grid connection; agreements vary by utility and local authority. Utilities generally want the solar system’s technical specifications and may, in some cases, inspect it with the local authority having jurisdiction. DOE places utility permission to operate (PTO) after the agreement and any potential inspection, and says an engaged installer handles this process. DOE, “Solar Energy Guide for Homebuilders”
If PTO is pending, ask the installer or utility which exact step is outstanding, who owns it, and which written record confirms status. Keep local status, procedure, inspection, timing, and authorization unknown.