DC Solar Permits and Pepco Interconnection: What Each Approval Covers

If you read older solar articles about DC, you will see references to DCRA, the former Department of Consumer and Regulatory Affairs. Per the official transition FAQs, DCRA was split in 2022 into two agencies: the Department of Buildings (DOB), which now handles construction permitting and inspections, and the Department of Licensing and Consumer Protection (DLCP), which handles business and professional licensing. For a residential solar project, the permitting authority is DOB.

DOB's solar permitting covers the parts of the project that are construction: how the array attaches to the roof, whether the structure can carry it, and whether the electrical work meets code. Details of DOB's current solar process are on the DOB solar page. Depending on the property and scope, a project can also involve separate reviews, for example structural documentation or, for properties in historic districts, review of visibility and placement. Which reviews apply is property-specific.

For qualifying projects, DOB operates an instant-permit process. Per DOB's instant permits page, qualifying solar systems on one- and two-family dwellings up to 15 kW may be eligible to receive a permit through this streamlined path rather than full plan review. Eligibility is defined by DOB's current criteria, so whether a specific project qualifies is determined at application time, and larger or more complex projects go through standard review.

Interconnection is the utility's approval to let a generating system operate in parallel with its distribution grid. For DC homes that utility is Pepco. The installer typically prepares and submits the interconnection application on the homeowner's behalf, responds to any utility review questions, and coordinates metering changes. Requirements, forms, and review timing are set by Pepco and can change, so we describe the track generally here rather than promising steps or dates.

The practical point for homeowners: interconnection is not a formality that rides along with the building permit. It is a separate approval from a separate organization, and a project is not done until it is granted.

"Permission to operate" (PTO) is the utility's confirmation that the system may be switched on and run in parallel with the grid. A project generally reaches PTO only after the permitted work is complete, required inspections have passed, and the utility has finished its interconnection process. Until then, an installed system typically sits idle. This is why a permit in hand, or even panels on the roof, is not the same as a working solar system.

• Design and contract: system size, equipment, and structure are settled
• DOB permitting: instant permit if the project qualifies, standard review if not
• Installation and inspections: the permitted work is built and inspected
• Pepco interconnection: application, utility review, and any metering work
• Permission to operate: the utility authorizes the system to run

Treat this list as the common shape of a project, not a fixed sequence. Some steps overlap, some run in a different order, and timing is set by the agencies and the utility, not by the installer.

• Who submits the DOB permit application, and will I get the permit number?
• Does my project qualify for the instant-permit process, and if not, why?
• Who submits the Pepco interconnection application, and who tracks its status?
• Is my home in a historic district, and does that change the review?
• What exactly triggers permission to operate, and who tells me when I have it?

If you want this handled for you on a qualifying DC roof, our DC solar page describes how we manage DOB permitting and Pepco interconnection as part of the $0 PPA process.