DC's failing grid is blocking solar installs — what Pepco isn't telling you

Thousands of DC homeowners have signed solar contracts, only to discover afterward that Pepco requires costly infrastructure upgrades before their system can connect to the grid. In some cases those costs run into six figures. Most solar companies never mention this risk upfront.

Washington DC has one of the most ambitious renewable energy programs in the country. The District has committed to 100% renewable energy by 2032. Yet the very infrastructure that solar panels need to connect to — DC's aging electrical grid — is becoming one of the biggest obstacles to actually going solar in the city.

How the process actually works

Here is what most DC homeowners don't know when they sign a solar contract: Pepco interconnection approval happens after you sign — not before. The process works like this. A homeowner signs a solar agreement. The solar company submits a Net Energy Metering (NEM) application to Pepco. Pepco then reviews the local grid infrastructure at that address and determines whether upgrades are needed to safely connect the system.

If upgrades are required, Pepco sends a cost estimate letter to the solar installer. The homeowner then has 30 days to decide: pay the upgrade costs, downsize the system to avoid upgrades, or walk away from the project entirely.

Real examples from DC neighborhoods

These are not hypothetical scenarios. The following are real cases from actual Pepco interconnection letters issued to DC homeowners.

These two cases illustrate the range. Some neighborhoods face massive infrastructure costs in the six figures. Others face smaller but still significant charges in the tens of thousands. And in every case, the homeowner only finds out after they've already signed.

Why is DC's grid in this condition?

Washington DC's electrical infrastructure was largely built in the mid-20th century. Much of the underground distribution system — the cables, transformers, and service lines that carry electricity to homes — was designed for one-way power flow, from the utility to the customer.

Solar panels fundamentally change that relationship. When your panels produce more electricity than your home uses, that excess power flows back into the grid. Older infrastructure wasn't designed to handle this two-way flow safely. When multiple homes in the same area install solar, the cumulative load on aging cables and transformers can exceed their rated capacity.

Pepco has been aware of this problem for years. The utility's multi-year rate increase plan — which has raised DC residential bills three years in a row — is partly justified by the need to upgrade this infrastructure. Ratepayers are funding those upgrades through higher bills. But the upgrades are happening slowly, neighborhood by neighborhood, and in the meantime solar customers who need interconnection in areas that haven't been upgraded yet are being asked to pay for the work themselves.

How often does this happen?

Infrastructure upgrade requirements are not rare edge cases. In some DC neighborhoods — particularly in areas with older housing stock and aging underground cables — a significant portion of solar applications trigger upgrade requirements. Experienced solar installers in DC know which neighborhoods are high-risk and which are more likely to sail through interconnection without issues.

Solar companies that don't check this before signing you up are either inexperienced or choosing not to disclose a risk that might cost them a sale. Either way, the homeowner bears the consequences.

What DC homeowners should ask before signing

A reputable solar company will answer every one of these questions directly. They will know their neighborhood history, they will have clear cancellation terms if interconnection fails, and they will not minimize the risk of upgrade requirements.

Does this affect free PPAs differently than loans?

Yes — and this is an important distinction. With a solar loan, you are financially committed to the project from the day you sign. If Pepco then requires $127,000 in upgrades, you face a difficult choice between paying, downsizing significantly, or trying to cancel and potentially facing contract complications.

With a reputable free PPA provider, the solar company bears the risk of interconnection requirements — not you. If Pepco requires upgrades that make the project uneconomical, the company absorbs that outcome. Your exposure is significantly lower. This is one of the underappreciated advantages of a well-structured free PPA: the company has strong incentive to only sign up homes where interconnection is likely to succeed.