Washington, DC solar decisions
Washington, DC Rooftop Solar: Property and Quote Review
A useful DC rooftop-solar decision starts with who controls the roof, usable area and access, the solar-only cash price, expected production, and Pepco interconnection and bill treatment.
Updated September 12, 2026 · California Rate Relief is a private solar referral service.
The short answer
Do not judge cost from the monthly payment. Ask for the solar-only cash price, DC system size, first-year production estimate and every add-on. Then compare the remaining utility bill under the correct tariff. The result depends on the property and contract, so this page does not publish a fake statewide “final price.”
A useful price benchmark, not a Washington, DC quote
NREL’s 2024 Annual Technology Baseline uses a 2023 bottom-up residential benchmark of $2.68 per DC watt. At that benchmark, an 8 kW system is $21,440 before financing, a battery, roof work and project-specific additions. It is a dated national modeling reference. A current local proposal can be higher or lower.
Compare cash price per watt first: divide the solar-only cash price by the system’s DC watts. Keep batteries, roofing, electrical upgrades and dealer or loan fees on separate lines. A financed contract with a low stated rate can still cost much more than the cash system.
What changes the Washington, DC price
- Roof planes, shade, structural work and whether roofing is included.
- Panel and inverter models, battery capacity, backup loads and electrical upgrades.
- Permits, utility interconnection and the party responsible for corrections.
- Cash purchase, loan fees and APR, lease or power-purchase escalator, and transfer terms.
- Expected production, degradation and the estimate for the bill that remains.
Use the utility on the bill
Common investor-owned utilities include Pepco. A proposal should name the actual utility, tariff and interconnection assumptions. Do not accept a generic savings chart that treats every utility or export rule as the same.
DC’s Department of Energy and Environment treats rooftop solar and community solar as different paths. A renter, condo resident or homeowner whose roof is unsuitable may be able to consider a community subscription, which does not install equipment on the home. Compare its subscription contract separately from a rooftop proposal.
Related decision guides
Check the property before the production claim
For a rowhouse, condominium or shared building, establish roof ownership, association or co-owner authority, usable area, shade, equipment location and safe installer access before treating a production estimate as viable.
Put the quotes on the same basis
A smaller monthly payment can hide a longer contract, less equipment or a larger remaining electric bill. Ask each bidder to fill the same gaps.
| Compare | Get it in writing |
|---|---|
| System and output | Same DC system size, module/inverter models and roof layout; monthly production with shading and losses shown. |
| Battery and backup | Usable kWh, continuous output, backed-up circuits, reserve setting and expected replacement costs. |
| Price and scope | Separate solar, battery, roof, panel upgrade, permits and interconnection. Compare cash prices before financing. |
| Utility bill | Same usage history and tariff; separate onsite use, grid imports, export credits and remaining fixed/delivery charges. |
| Contract and service | Who installs and who services it; written coverage by address, insurance, license record, exclusions and warranty claim process. |
| Payment and transfer | Cash, loan, lease or PPA; upfront costs, APR or escalator, total payments, home-sale and end-of-term terms. |
Before signing
Verify the contracting business through the DC Department of Licensing and Consumer Protection. Residential contractors need the applicable contractor license, and DC requires home-improvement contractors and general contractors doing residential work to maintain a licensed home-improvement salesperson.
Put roof access, structural and electrical work, permits, Pepco interconnection, equipment, payment schedule, timeline and change-order rules in the written contract. Treat any “free solar” or guaranteed-savings statement as a claim that must be documented.
Use the Washington, DC quote-comparison checklist to compare the companies on the same basis.
Want to discuss your solar options?
Send your project details to California Rate Relief. We collect the information for a solar referral; the provider confirms availability, design and price. The calculator and checklist are yours to use without submitting.