Solar in Washington, D.C. costs about $3.06 per watt, so the typical 5.48 kW system runs about $16,769 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, enough to break even in about 5 to 6 years.
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.
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$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 5 to 6 years to break even: a 7 kW District system, income side included
There is no upfront rebate to subtract for most buyers. The District’s value arrives as income.
7 kW system at $3.00 to $3.50 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 moveThe 5 to 6 years holds at current certificate prices. The cost is counted once and the certificate income once; the income only counts if you own and register the certificates.
Solar for AllIncome-qualified households at or below 80% of area median income may have installation covered outright through Solar for All, run by the DC Sustainable Energy Utility.
What $3.06 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 $3.06. 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.
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Next reads on District solar
Frequently asked questions
How much do solar panels cost in Washington, D.C.?
Solar panels cost $3.00 to $3.50 per watt installed in Washington, D.C. in 2026, which puts a typical 5.48 kW system at $16,440 to $19,180 and a 6.45 kW system at roughly $19,350 to $22,575. 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. A $21,000-$24,500 system earning roughly $4,100-$4,500 a year in certificates and bill credits reaches breakeven in about 5 to 6 years at current certificate prices, and income-qualified households at or below 80% of area median income may have installation covered outright through Solar for All.
How we calculate these costs
Cost figures use the District of Columbia’s entry in the EcoGen Solar Cost Index (v2 method): a standardized installed price per watt, blended from current marketplace data and benchmarked against the national modeled cost. Payback and 25-year figures use the EcoGen Solar Payback Methodology at 4% yearly rate growth and 0.5% panel degradation over 25 years. System size, average system cost and the average monthly bill come from the State Profile (EIA consumption data, the NREL production factor and the state residential rate). 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
