Solar Utility Interconnection Filing Services

Utility interconnection filing is the paperwork side of getting solar projects connected to the grid. Every US utility has its own application forms, portal, submission requirements, and technical review process. Filing an application correctly on first attempt determines whether the project clears interconnection in weeks or gets stuck in the queue for months. RIH Engineering delivers utility interconnection filing as an outsourced back-office service for US solar EPCs, installers, and developers operating across multiple utility service territories.

What you get

• Complete interconnection application preparation for every major US utility (PG&E, ConEd, PSE&G, LADWP, SDG&E, APS, SRP, Xcel, Eversource, National Grid, ComEd, Duke Energy, FPL, and hundreds of others)
• Application submission through utility portals with all required supporting documentation
• Interconnection queue position tracking with proactive status updates
• Utility technical review response drafting for review comments
• Interconnection agreement execution coordination
• Witness test scheduling coordination where required
• Meter installation coordination with utility
• Permission to Operate (PTO) tracking and documentation collection
• Standardized status reporting on all projects in interconnection queue

What we handle for you

Interconnection filing is specialty paperwork. Each utility has different forms, different documentation requirements, different review workflows, and different timelines. A solar company operating across 5 to 10 utility territories effectively needs 5 to 10 different filing workflows in-house. Doing this efficiently requires either a dedicated interconnection specialist or an outsourced team that already knows every utility.

We take interconnection filing off your plate. You send us the project details and utility. We handle application preparation, portal submission, technical review response, agreement execution, witness testing coordination, and PTO tracking from first submission through operation approval.

The cost of doing this in-house

Interconnection application errors are one of the top causes of solar project delays in the US. Wrong SLD format, incomplete equipment specifications, missing supporting studies, incorrect protection settings, each triggers a rejection and pushes the project weeks or months down the queue. In territories like PG&E and PSE&G, interconnection queues already stretch 6 to 18 months. Every rejection resets your position.

Companies with clean interconnection filing workflows clear the process meaningfully faster than companies that treat interconnection as an afterthought. Utility technical review staff also develop relationships with clean filers, which speeds up review across every subsequent project.

Why RIH Engineering is safe to try

Send us one project needing interconnection filing. We handle application preparation and submission at agreed pricing. If technical review comes back with rejection due to filing errors, we handle the response and refiling at no additional cost until interconnection acceptance.

Our team maintains utility-specific application templates, current knowledge of technical review requirements, and portal access for every major US utility. We update templates as utilities revise their standards and stay current on state PUC interconnection policy changes.

Our process

1. You send us project details, equipment selection, utility, and any SLD or engineering documentation available
2. Our filing coordinator verifies utility-specific application requirements and current forms
3. Application prepared with all required project data (customer information, equipment, system size, protection settings)
4. Supporting documentation compiled (SLD, equipment specifications, PVRSS listings, metering configuration)
5. Application submitted through utility portal
6. Queue position tracked and status updated weekly
7. Technical review comments responded to; engineering revisions coordinated with design team
8. Interconnection agreement execution coordinated
9. Witness test and meter installation coordinated where required
10. PTO tracked and documentation delivered upon approval

Tools and standards

Our interconnection filing team works across utility portals for every major US investor-owned utility, municipal utility, and rural electric cooperative. We maintain current knowledge of application requirements, queue procedures, and technical review patterns.

Client-preferred tools: Our team can be trained to use the tool preferred by the client. If your workflow depends on a specific platform, template, or software, we adapt to it rather than force you into ours.