Solar in Washington, D.C. costs about $3.21 per watt, so the typical 9.03 kW system runs about $28,986 before incentives, above the national average. The price is the smaller half of a District quote: a 7 kW system earns roughly $2,900 to $3,200 a year in certificates plus $1,200 to $1,350 in Pepco bill credits. Best-case payback on power savings alone: about 9.5 years, if every kWh the 9.03 kW system makes replaces power at the 24.20¢ District average. Certificate income comes on top and shortens it.
Price your roof against the District’s 2026 band
D.C. installs cost more than average, and certificate income changes the math. Enter your ZIP code to anchor yourself before you compare bids.
EcoGen is a referral service. Your request may be shared with installers, marketplaces or lead exchanges, and more than one provider may contact you. Review the contact consent before submitting.
- Free, no-obligation quotesRequest quotes from local installers in minutes. You decide if you go ahead.
- Compare provider credentialsAsk for licensing, insurance and warranty details before signing.
- Your details come lastFour quick questions about your home first. Name, email and phone only at the end.
$360 to $400 a certificate, plus full-retail Pepco credits: what a D.C. roof earns
The sticker is only half a District cost conversation. Income starts the month the meter spins, and certificate income alone can cover a third or more of the system’s cost across its early years.
Solar renewable energy certificates
A 7 kW system generates about 8 certificates a year. D.C. certificates have traded at $360 to $400 each. The income is yours when you own and register them.
Pepco full-retail netting
Pepco nets your solar at the full retail rate. On typical usage, that is worth this much again on top of the certificates.
The lost federal credit barely moves D.C. mathThe federal residential credit is gone for systems completed after December 31, 2025. In this one market its absence barely moves the math: the certificates were always the bigger line.
About 9.5 years to pay back in the best case: the typical 9.03 kW District system
There is no upfront rebate to subtract for most buyers. The District’s value arrives as income.
9.03 kW system at $3.21 per watt
See where that income comes from in our D.C. incentives guide, check the verdict math in our D.C. worth-it analysis, and compare the verified D.C. installers before you shortlist anyone.
Certificate prices can moveCertificate income shortens the 9.5 years, but certificate prices move. The income only counts if you own and register the certificates.
Solar for AllSolar for All, run by the DC Sustainable Energy Utility, can cover rooftop solar or give community-solar bill credits to households at or below 80% of area median income. New rooftop applications are on a waitlist for now.
What $3.21 a watt buys in the District, 5 kW to 9 kW
Quotes in the District usually land between $3.00 and $3.50 per watt, and the EcoGen Index sits inside that band at $3.21. For the picture beyond Washington DC, start with our solar panel costs nationwide.
Quote ranges at $3.00 and $3.50 per watt, before any incentive. Real quotes vary by roof, equipment and installer.
The edges of the bandQuotes below $2.80 per watt deserve suspicion. Quotes above $3.70 need a written reason, with structural work or specialty roofing among the legitimate ones.
Financing a District system: two contract checks that keep the certificates yours
Strong economics attract creative financing. A financed D.C. system can still be an excellent purchase; one that surrendered its certificates rarely is.
- Can I see the cash price next to the financed price? The gap is the dealer fee. In the District it sometimes hides inside a “free panels” pitch that quietly assigns your certificates.
- Does the contract say the SREC income accrues to me? Confirm it is not applied against the loan’s fee.
Five signs a District quote is off
Walk away, or ask hard questions, if a quote shows any of these:
- A price below $2.80 per watt with no explanation. Someone is economizing on the parts of a D.C. install that matter: rigging, permitting experience, or the crew itself.
- A price above $3.70 per watt with no written reason. Structural work and specialty roofing justify it; “premium equipment” alone usually does not.
- Certificate income counted twice. Some quotes subtract SREC income from the price AND show it as annual income. It is one number, not two.
- A payback chart still showing the federal credit. It ended December 31, 2025. Its ghost dates the whole spreadsheet.
- No cash price anywhere. Without the cash anchor, the dealer fee inside a financed total is invisible.
Check a D.C. quote before you sign it
Already holding a bid? Enter your ZIP code and check it against what District systems actually cost, certificates included.
- Quotes built for your roofEach quote is designed around your home and your bills.
- Check the providerVerify licensing, insurance and warranty terms before signing.
- No cost, no pressureComparing quotes is free, and you are never obliged to sign.
Next reads on District solar
Frequently asked questions
How much do solar panels cost in Washington, D.C.?
Solar panels cost about $3.21 per watt installed in Washington, D.C. (EcoGen Solar Cost Index, September 2026 Edition), so the typical 9.03 kW system costs about $28,986 before incentives. Most quotes land between $3.00 and $3.50 per watt. Certificate income of about $2,900-$3,200 a year on a 7 kW system offsets that cost faster than any state-level incentive in the country.
Why is solar more expensive in D.C. than in Maryland or Virginia?
Row-house roofs, historic-district review and DCRA permitting make District installs more labor- and process-intensive than suburban ones, which raises the per-watt price. The offset is that D.C. certificates pay roughly 8 times what Maryland’s do, so the more expensive install still repays years faster.
What does a solar system cost in D.C. after incentives?
There is no upfront rebate to subtract for most buyers; the District’s value arrives as income. The typical 9.03 kW system costs about $28,986 and pays back in about 9.5 years in the best case, if every kWh replaces power at the 24.20¢ District average; certificate income on top shortens it. Households at or below 80% of area median income may get free solar through Solar for All, though new rooftop applications are on a waitlist.
How we calculate these costs
Cost figures use the District of Columbia’s entry in the EcoGen Solar Cost Index (September 2026 Edition): the installed price per watt, built from the Department of Energy’s cost benchmark adjusted for local labor wages, run through our cost model, calibrated against current marketplace quotes and checked against installed prices from Berkeley Lab. The typical system size is Berkeley Lab’s 2025 median for District single-family installs (1,975 systems); the typical cost is that size times the price per watt. The best-case payback divides that cost by the year-one value of the power the system makes: 12,607 kWh at the 24.20¢ District average (EIA, August 2025 to July 2026), before certificate income. Real quotes vary by roof, equipment and installer.
Sources (4)
- DC Department of Energy and Environment (DOEE), Renewable Portfolio Standard and SREC Market Structure (accessed August 8, 2026): doee.dc.gov
- Pepco, Net Energy Metering for District of Columbia Customers (accessed August 8, 2026): pepco.com
- DC Sustainable Energy Utility (DCSEU), Solar for All Program (accessed August 8, 2026): dcseu.com
- IRS, FAQs for Modification of Section 25D under Public Law 119-21 (accessed August 8, 2026): irs.gov
